Protective member, battery cap and battery cell

Abstract

The application provides a protection piece, a battery cap and a battery monomer. The protection piece comprises: a mounting part used for fixing the battery cap and maintaining electrical connection with an outer conductive piece; a contact part used for being in electrical contact with an inner conductive piece in a normal state; a deformation part integrally connected between the mounting part and the contact part; wherein the deformation part is configured to deform when the internal pressure of the battery reaches a set threshold, thereby driving the contact part to separate from the inner conductive piece, so as to realize power-off protection. The power-off protection is realized through the deformation of the deformation part, thereby improving the safety of the battery.

Description

Technical Field

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

[0002] Currently, in related technologies, the common battery safety valve is to stamp a groove on the valve plate. When the internal pressure of the battery rises to a certain level, the valve plate will flip along the groove, causing the bottom of the valve plate to disengage from the conductive plate, thereby achieving the power-off protection function.

[0003] However, this safety valve design method has shortcomings. Grooving the valve plate requires a specialized grooving process, which not only increases the number of steps in the production process but also necessitates controlling parameters such as the depth and width of the grooves. This leads to a complex production process, lower production efficiency, and increased battery production costs. Utility Model Content

[0004] This application provides a protective component, a battery cap, and a battery cell to at least partially solve the above-mentioned technical problems.

[0005] In a first aspect, embodiments of this application provide a protective component for mounting on a battery cap, the battery cap including an outer conductive component and an inner conductive component; the protective component includes: a mounting portion for being fixedly mounted on the battery cap and maintaining electrical connection with the outer conductive component; a contact portion for making electrical contact with the inner conductive component under normal conditions; and a deformation portion integrally connected between the mounting portion and the contact portion; wherein the deformation portion is configured to deform when the internal pressure of the battery reaches a set threshold, causing the contact portion to separate from the inner conductive component, thereby achieving power-off protection. Power-off protection is achieved through the deformation of the deformation portion, improving battery safety.

[0006] Optionally, the mounting portion, contact portion, and deformation portion are all sheet-like structures; the thickness of the deformation portion is less than the thickness of the mounting portion and / or contact portion. The sheet-like structure and the smaller thickness of the deformation portion make it easier for the deformation portion to deform under pressure, thereby improving the sensitivity of the power failure protection.

[0007] Optionally, the protective component meets at least one of the following requirements: the thickness of the mounting portion is L1, 0.15mm≤L1≤0.3mm; the thickness of the contact portion is L2, 0.15mm≤L2≤0.3mm; the thickness of the deformation portion is L3, 0.075mm≤L3≤0.15mm; the ratio of the thickness of the deformation portion to the thickness of the mounting portion is L3 / L1, 0.3≤L3 / L1≤0.7; the ratio of the thickness of the deformation portion to the thickness of the contact portion is L3 / L2, 0.3≤L3 / L2≤0.7. By reasonably setting the thickness and ratio of each part, the mechanical strength and deformation sensitivity of the protective component are ensured, and the reliability and efficiency of the power failure protection are improved.

[0008] Optionally, the mounting portion is arranged around an axis; the deformation portion extends inward from the inner edge of the mounting portion, and the contact portion is located in the inner region of the deformation portion; under normal conditions, the contact portion is closer to the inner conductive element than the mounting portion. The closer proximity of the contact portion to the inner conductive element facilitates rapid flipping deformation under air pressure, thus improving the speed of power-off protection.

[0009] Optionally, the deformable part is a truncated cone cylindrical structure, with the large-diameter end of the truncated cone cylindrical structure connected to the mounting part and the small-diameter end connected to the contact part; the generatrix inclination angle θ of the truncated cone cylindrical structure satisfies 14°≤θ≤45°.

[0010] The truncated cone structure and the angle of the generatrix allow the deformable part to smoothly rotate and deform under air pressure, improving the sensitivity of the power failure protection.

[0011] Optionally, the section along the axis has a Z-shaped bend structure on one side of the mounting part, with the end of the mounting part near the inner conductive component connected to the deformation part. The Z-shaped bend structure increases the contact area between the mounting part and the inner conductive component, ensuring tight contact, while also limiting the inner conductive component, thus improving the energy conversion efficiency and safety of the battery.

[0012] Optionally, the contact portion has a sheet-like structure, including a thinned region. The thickness of the thinned region is less than that of the other parts of the contact portion. The thinned region is used for conductive contact and fixation with the internal conductive component. The thinned region is easily damaged when the contact portion is moved and attempts to detach from the internal conductive component, thus achieving pressure relief protection and improving battery safety.

[0013] Optionally, the thinning zone is formed by providing a groove on the side of the contact portion away from the inner conductive element. The contact portion with the thinning zone is formed in one step using a stamping process, reducing production steps and processing time, and improving production efficiency.

[0014] Optionally, the protective component meets at least one of the following requirements: the thickness of the thinned area is L4, 0.25 mm ≤ L4 ≤ 1 mm; the thickness of the other parts of the contact area is L5, 1.5 mm ≤ L5 ≤ 3 mm; the ratio of the thickness of the thinned area to the thickness of the other parts of the contact area is L4 / L5, 0.08 ≤ L4 / L5 ≤ 0.67. Reasonably setting the thickness and ratio of the thinned area to the other parts of the contact area ensures that the thinned area can break down to relieve pressure when needed, while also guaranteeing the overall strength of the contact area.

[0015] Optionally, the ratio of the projected area S1 of the thinned region on the contact portion to the total area S2 of the contact portion satisfies: 0.3 ≤ S1 / S2 ≤ 0.7. Reasonably setting the area ratio of the thinned region avoids damage to the contact portion due to slight pressure fluctuations during normal use, while also ensuring timely pressure relief when the internal pressure of the battery increases sharply.

[0016] Secondly, embodiments of this application provide a battery cap, including any of the protective components described above; further comprising: a cap body having a receiving cavity, the protective component being fixedly disposed within the receiving cavity and sealed to the inner wall of the cap body; an external conductive component disposed on the cap body and used to form the external terminal of a battery cell; an internal conductive component disposed on the cap body and used to electrically connect to the electrode tab of the battery cell; the protective component being electrically connected between the external conductive component and the internal conductive component. The battery cap integrates the protective component, enabling monitoring of the internal pressure of the battery and power-off protection, thereby improving the overall safety and reliability of the battery.

[0017] Optionally, the inner conductive component is fixedly connected to the contact portion and abuts against the mounting portion; the cover has a stop portion in the receiving cavity, and the inner conductive component is located between the stop portion and the protective component, and is movably disposed in the receiving cavity. The stop portion prevents the inner conductive component from moving freely inside the battery and causing short circuits or other faults with other components, further ensuring the safety of the battery.

[0018] Optionally, the section along the axis has a Z-shaped bend structure on one side of the mounting part; the peripheral edge of the inner conductive component extends to the outside of the bend in the mounting part and fits into the mounting part. The Z-shaped bend structure limits the inner conductive component, ensuring reliable separation between the contact part and the inner conductive component, thus improving the stability of the power failure protection.

[0019] Optionally, the contact portion includes a thinned area, which is spot-welded to an inner conductive element; the inner conductive element is positioned corresponding to the thinned area for electrical connection with the tab. The spot-welding connection provides a stable and reliable connection under normal operating conditions, while also ensuring that a hole is created at the spot weld in the thinned area for pressure relief when the gas pressure reaches a predetermined value, thus improving the stability of the pressure relief protection mechanism.

[0020] Thirdly, embodiments of this application provide a battery cell including the battery cap described above. The battery cell integrates a battery cap with power-off protection function, improving the overall safety and reliability of the battery cell.

[0021] In this embodiment, the protective component achieves separation of the contact portion from the internal conductive component by deforming the deformation portion. The protective component structure can be formed by stamping in one step without the need for additional grooving, which simplifies the production process, improves production efficiency, and reduces production costs.

[0022] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0024] Figure 1 This is a schematic front sectional view of a protective component provided in an embodiment of this application; Figure 2 This is a front cross-sectional schematic diagram of a protective component provided in another embodiment of this application; Figure 3 This is a top view schematic diagram of a battery cap provided in an embodiment of this application; Figure 4 yes Figure 3 A schematic sectional view of an embodiment; Figure 5 yes Figure 3 Another embodiment, AA cross-sectional view; Explanation of reference numerals in the attached figures: 1. Battery cap 10. Protective components; 11. External conductive components; 12. Internal conductive components; 100. Installation Department; 110. Contact area; 1101. Thinning zone; 1102. Groove; 120. Deformation section; 13. Cover; 131. Receiving cavity; 132. Stop. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0026] Currently, in related technologies, the common cylindrical battery safety valve is made by stamping a groove on the valve plate. When the internal pressure of the battery rises to a certain level, the valve plate will flip along the groove, causing the bottom of the valve plate to disengage from the conductive plate, thereby achieving the power-off protection function.

[0027] However, this safety valve design method has shortcomings. Grooving the valve plate requires a specialized grooving process, which not only increases the number of steps in the production process but also necessitates controlling parameters such as the depth and width of the grooves. This leads to a complex production process, lower production efficiency, and increased battery production costs.

[0028] Regarding the above technical issues, firstly, refer to Figure 1 , Figure 3 , Figure 4 This application provides a protective component 10 for mounting on a battery cap 1. The battery cap 1 includes an outer conductive component 11 and an inner conductive component 12. The protective component 10 includes: a mounting portion 100 for being fixedly mounted on the battery cap 1 and electrically connected to the outer conductive component 11; a contact portion 110 for making electrical contact with the inner conductive component 12 under normal conditions; and a deformation portion 120 integrally connected between the mounting portion 100 and the contact portion 110. The deformation portion 120 is configured to deform when the internal pressure of the battery reaches a set threshold, thereby causing the contact portion 110 to separate from the inner conductive component 12, thus achieving power failure protection.

[0029] Understandably, under normal battery operating conditions, the deformable portion 120 maintains a stable shape, and the contact portion 110, supported by the deformable portion 120, makes close contact with the inner conductive element 12, forming a good electrical connection. At this time, current can smoothly pass through the mounting portion 100, the deformable portion 120, the contact portion 110, and the inner conductive element 12, forming a complete circuit loop, enabling the battery to normally output electrical energy.

[0030] When the internal pressure of the battery reaches the set threshold, the entire protective component 10 will be subjected to the internal air pressure. Under the push of the air pressure, the deformation part 120 will be flipped and deformed, causing the contact part 110 connected to it to generate a force that moves away from the internal conductive component 12.

[0031] In this embodiment, since the deformable portion 120 is integrally connected between the mounting portion 100 and the contact portion 110, and according to functional requirements, the rigidity of the deformable portion 120 is set to be lower than that of the mounting portion 100 and the contact portion 110. For example, by locally thinning the deformable portion 120, selecting an elastic material, or designing it as an arc or bent structure, the deformable portion 120 is more likely to undergo elastic or plastic deformation compared to other parts when the internal pressure of the battery reaches a set threshold. After the deformable portion 120 deforms, it will cause the contact portion 110 to separate from the internal conductive component 12, thereby cutting off the internal circuit of the battery, realizing power-off protection, and preventing the battery from being dangerous due to excessive internal pressure.

[0032] The protective component 10 in this embodiment differs from the related technology in that grooves are machined on the protective component 10. In this embodiment, the contact portion 110 and the inner conductive component 12 are separated by setting the deformation of the deformation portion 120. The structure of the protective component 10 can be formed by stamping in one step without the need for additional grooving process, which simplifies the production process, improves production efficiency, and reduces production costs.

[0033] In some embodiments, reference Figure 1 The mounting portion 100, contact portion 110, and deformable portion 120 are all sheet-like structures; the thickness of the deformable portion 120 is less than the thickness of the mounting portion 100 and / or the contact portion 110. In this embodiment, by designing the mounting portion 100, contact portion 110, and deformable portion 120 as sheet-like structures, the sheet-like structure has a large surface area to thickness ratio, making it easier to deform under pressure. Furthermore, by setting the thickness of the deformable portion 120 to be less than the thickness of the mounting portion 100 and / or the contact portion 110, the deformable portion 120 becomes the part of the entire protective component 10 most prone to deformation under the internal pressure of the battery. This ensures that when the internal pressure of the battery reaches a set threshold, the deformable portion 120 deforms rapidly and accurately, causing the contact portion 110 to separate from the internal conductive component 12, promptly cutting off the circuit, and improving the sensitivity and reliability of the power failure protection.

[0034] Furthermore, during the production process, adjusting the thickness of the deformable part 120 can be achieved simply by setting matching parameters at the corresponding position in the mold, which is beneficial for large-scale production and widespread application of the product. Moreover, this structure of the protective part 10 can be manufactured through a single stamping process, eliminating the need for complex multiple processing steps, greatly simplifying the production process, improving production efficiency, and reducing production costs.

[0035] In some embodiments, reference Figure 1 The following conditions must be met: the thickness of the mounting portion 100 is L1, 0.15mm≤L1≤0.3mm; the thickness of the contact portion 110 is L2, 0.15mm≤L2≤0.3mm; the thickness of the deformable portion 120 is L3, 0.075mm≤L3≤0.15mm; the ratio of the thickness of the deformable portion 120 to the thickness of the mounting portion 100 is L3 / L1, 0.3≤L3 / L1≤0.7; the ratio of the thickness of the deformable portion 120 to the thickness of the contact portion 110 is L3 / L2, 0.3≤L3 / L2≤0.7.

[0036] In this embodiment, performance is ensured by reasonably designing the thickness range. Specifically, the thickness L1 of the mounting part 100 is set within the range of 0.15mm ≤ L1 ≤ 0.3mm, such as 0.15mm, 0.16mm, 0.17mm, 0.21mm, and 0.3mm. If the thickness is too small, the mechanical strength of the mounting part 100 will be insufficient, and problems such as loosening of the connection may easily occur when it is fixedly connected to the battery cap 1 and electrically connected to the external conductive component 11. If the thickness is too large, it will increase the space occupied and affect the overall structural compactness of the battery.

[0037] The thickness L2 of the contact portion 110 is within the range of 0.15mm ≤ L2 ≤ 0.3mm, such as 0.15mm, 0.16mm, 0.17mm, 0.21mm, and 0.3mm. If the thickness is too small, the internal resistance of the battery will increase during the electrical contact between the contact portion 110 and the inner conductive component 12, reducing the battery's output efficiency and performance. Furthermore, an excessively thin contact portion 110 is more prone to damage, affecting the reliability of the power-off protection. If the thickness is too large, it will increase the welding difficulty between the contact portion 110 and the inner conductive component 12, and will also increase material consumption and production costs.

[0038] The thickness L3 of the deformable part 120 is 0.075mm ≤ L3 ≤ 0.15mm, for example, 0.075mm, 0.09mm, 0.11mm, 0.13mm, 0.15mm. When the thickness is too small, the mechanical strength of the deformable part 120 is too low, and it may deform unexpectedly due to minor external forces or vibrations, or break under air pressure. If the thickness is too large, the rigidity of the deformable part 120 is increased, which increases the difficulty of flipping the protective part 10 and increases the risk of battery malfunction.

[0039] Furthermore, this embodiment is designed with an appropriate thickness ratio to ensure sensitive power-off protection. Specifically, the ratio L3 / L1 of the thickness of the deformable part 120 to the thickness of the mounting part 100 satisfies 0.3≤L3 / L1≤0.7, for example, 0.3, 0.4, 0.5, 0.6, 0.7. If the ratio is too small, the deformable part 120 is too thin relative to the mounting part 100. Although the deformable part 120 is easier to deform, it may result in low strength and easy breakage, affecting the reliability of the power-off protection. If the ratio is too large, the thickness of the deformable part 120 is similar to that of the mounting part 100, increasing the difficulty of deforming the deformable part 120 and reducing the sensitivity of the power-off protection.

[0040] The ratio L3 / L2 of the thickness of the deformable portion 120 to the thickness of the contact portion 110 is in the range of 0.3 ≤ L3 / L2 ≤ 0.7, for example, 0.3, 0.4, 0.5, 0.6, 0.7. If the ratio is too small, the deformable portion 120 is too thin relative to the contact portion 110. Although the deformable portion 120 is easier to deform, it may result in low strength and easy breakage, affecting the reliability of the power failure protection. If the ratio is too large, the thickness of the deformable portion 120 is similar to that of the contact portion 110, increasing the difficulty of deforming the deformable portion 120 and reducing the sensitivity of the power failure protection.

[0041] In some embodiments, reference Figure 1 , Figure 4 The mounting portion 100 is arranged around an axis; the deformable portion 120 extends inward from the inner edge of the mounting portion 100, and the contact portion 110 is disposed in the inner region of the deformable portion 120; under normal conditions, the contact portion 110 is closer to the inner conductive member 12 than the mounting portion 100.

[0042] In this embodiment, the contact portion 110 is closer to the inner conductive member 12 than the mounting portion 100, meaning the protective member 10 is shaped to protrude towards the inner conductive member 12, which facilitates flipping deformation under air pressure. Specifically, under the action of internal air pressure, the deformable portion 120 is subjected to a flipping force in the direction away from the inner conductive member 12. As the pressure continues to increase, the deformable portion 120 undergoes flipping deformation, thereby driving the contact portion 110 away from the inner conductive member 12, causing the contact portion 110 to separate from the inner conductive member 12, thus achieving the power failure protection function.

[0043] In some embodiments, reference Figure 1 The deformable part 120 is a truncated cone cylindrical structure. The large-diameter end of the truncated cone cylindrical structure is connected to the mounting part 100, and the small-diameter end is connected to the contact part 110. The generatrix inclination angle θ of the truncated cone cylindrical structure satisfies 14°≤θ≤45°.

[0044] In this embodiment, the deformation section 120 adopts a truncated cone cylindrical structure. Due to the shape characteristics of the truncated cone cylindrical structure, air pressure acts on the conical surface to generate a force that promotes deformation. The generatrix inclination angle θ of the truncated cone cylindrical structure is within the range of 14°≤θ≤45°, for example, 14°, 18°, 32°, 41°, and 45°, allowing the deformation section 120 to undergo relatively smooth overturning deformation under air pressure. When the generatrix inclination angle θ is too large, the truncated cone cylindrical structure approaches a cylinder. In this case, the deformation section 120 needs to overcome greater structural rigidity to deform under the internal air pressure of the battery, reducing the sensitivity of the power-off protection. If the generatrix inclination angle θ is too large, the truncated cone cylindrical structure becomes relatively flat. Although the deformation section 120 can begin to deform relatively easily under air pressure, excessive deformation or even rupture may occur, leading to instability in the deformation section 120 during the deformation process.

[0045] In some embodiments, reference Figure 1 , Figure 4 The mounting part 100 has a Z-shaped bend structure on one side of the axis, and the end of the mounting part 100 near the inner conductive member 12 is connected to the deformation part 120.

[0046] In this embodiment, the stepped structure formed by the Z-shaped bending structure serves to limit the movement of the inner conductive element 12. When the contact portion 110 tends to detach from the inner conductive element 12 under the action of the deforming portion 120, the inner conductive element 12 is blocked by the bending point of the mounting portion 100 and cannot move with the contact portion 110, thereby ensuring that the contact portion 110 and the inner conductive element 12 can be reliably separated.

[0047] Furthermore, the Z-shaped bending structure of the mounting portion 100 increases its contact area with the inner conductive element 12. Under normal conditions, the larger contact area allows for a tighter contact between the mounting portion 100 and the inner conductive element 12, ensuring lower resistance between them and improving the energy conversion efficiency of the battery.

[0048] In some embodiments, reference Figure 2 , Figure 3 , Figure 5 The contact portion 110 has a sheet-like structure and includes a thinning region 1101. The thickness of the thinning region 1101 is less than that of other parts of the contact portion 110. The thinning region 1101 is used to make conductive contact with and fix the inner conductive element 12.

[0049] In this embodiment, since the structural strength of the thinning region 1101 is relatively weaker than that of other parts of the contact portion 110, when the contact portion 110 is driven by the deformation portion 120 and attempts to detach from the inner conductive member 12, the connecting force between the inner conductive member 12 and the thinning region 1101 will cause partial damage to the thinning region 1101. Once the thinning region 1101 is damaged, the high-pressure gas inside the battery cell will quickly overflow from the damaged area. This not only achieves the separation of the contact portion 110 from the inner conductive member 12, thus achieving the purpose of power-off protection, but also effectively reduces the internal pressure of the battery by timely gas release, further improving the safety of the battery.

[0050] Furthermore, since the contact portion 110 is provided with a thinning area 1101, there is no need to provide a thinning portion on the inner conductive member 12. Therefore, when the inner conductive member 12 is welded to the tab, the tab does not need to avoid the thinning portion on the inner conductive member 12 and can be welded to a position slightly off-center on the inner conductive member 12, which facilitates the welding operation.

[0051] In some embodiments, reference Figure 2The thinning region 1101 is formed by providing a groove 1102 on the side of the contact portion 110 away from the inner conductive member 12.

[0052] In this embodiment, since the thinning area 1101 is formed by providing a groove 1102 on the side of the contact portion 110 away from the inner conductive element 12, a relatively mature stamping process can be used in the manufacturing process to obtain the contact portion 110 with the thinning area 1101 in one molding, which reduces the number of steps and processing time in the production process and improves production efficiency.

[0053] In some embodiments, reference Figure 2 The protective component 10 satisfies at least one of the following: the thickness of the thinned region 1101 is L4, 0.25 mm ≤ L4 ≤ 1 mm; the thickness of other parts of the contact portion 110 is L5, 1.5 mm ≤ L5 ≤ 3 mm; the ratio of the thickness of the thinned region 1101 to the thickness of other parts of the contact portion 110 is L4 / L5, 0.08 ≤ L4 / L5 ≤ 0.67.

[0054] In this embodiment, the thickness L4 of the thinning region 1101 satisfies 0.25mm ≤ L4 ≤ 1mm, for example, 0.25mm, 0.5mm, 0.7mm, or 1mm. The main function of the thinning region 1101 is to provide pressure relief protection through its own breakage. If L4 is too thick, the structural strength of the thinning region 1101 will be relatively high, which may result in the contact portion 110 not breaking when separating from the inner conductive component 12, thus failing to provide pressure relief protection. When L4 is too thin, the structural strength of the thinning region 1101 will become very weak. During normal use of the battery, it may be subjected to slight mechanical vibrations, collisions, or pressure changes, which can easily cause the thinning region 1101 to break, affecting the normal use of the battery.

[0055] In some embodiments, the ratio of the projected area S1 of the thinning region 1101 on the contact portion 110 to the total area S2 of the contact portion 110 satisfies: 0.3≤S1 / S2≤0.7.

[0056] In this embodiment, when the projected area of ​​the thinned region 1101 is too large, most of the contact portion 110 is in a relatively fragile and easily damaged state. During normal battery use, even minor, non-dangerous pressure fluctuations or mechanical vibrations can easily cause the contact portion 110 to deform or break, thus affecting the stability of the battery's internal structure. When the thinned region 1101 is too small, its pressure relief channel area is limited. When the internal pressure of the battery rises sharply, it is difficult to release the high-pressure gas in time, leading to a rapid accumulation of internal pressure and increasing the risk of battery explosion.

[0057] Secondly, refer to Figure 3 , Figure 4 , Figure 5This application provides a battery cap 1, including the protective component 10 of any of the above-mentioned components; it also includes: a cover body 13 having a receiving cavity 131, the protective component 10 being fixedly disposed in the receiving cavity 131 and sealed to the inner wall of the cover body 13; an outer conductive component 11 disposed in the cover body 13 and used to form the external terminal of the battery cell; an inner conductive component 12 disposed in the cover body 13 and used to electrically connect the electrode tab of the battery cell; the protective component 10 is electrically connected between the outer conductive component 11 and the inner conductive component 12 in a switchable manner.

[0058] Understandably, the cover 13 has a receiving cavity 131, which provides an installation position for the protective component 10 and also supports and protects the entire battery cover 1. The protective component 10 is fixedly disposed within the receiving cavity 131 and is sealed to the inner wall of the cover 13 to prevent electrolyte leakage from the battery and ensure airtightness. The external conductive component 11 constitutes the external terminal of the battery cell, used to connect with an external circuit to realize the output or input of battery power. The internal conductive component 12 connects the tab to the protective component 10 to form the internal circuit of the battery.

[0059] In this embodiment, the battery cap 1 includes any of the above-mentioned protective elements 10, and therefore also includes the advantages of any of the above-mentioned protective elements 10.

[0060] In some embodiments, reference Figure 4 , Figure 5 The inner conductive element 12 is fixedly connected to the contact part 110 and abuts against the mounting part 100; the cover 13 has a stop part 132 in the accommodating cavity 131, the inner conductive element 12 is located between the stop part 132 and the protective element 10, and is movably disposed in the accommodating cavity 131.

[0061] In this embodiment, since the cover 13 has a stop portion 132 within the accommodating cavity 131, and the inner conductive component 12 is located between the stop portion 132 and the protective component 10, when the inner conductive component 12 separates from the protective component 10, it will contact the stop portion 132. The stop portion 132 will prevent the inner conductive component 12 from detaching from the cover 13, thereby preventing the inner conductive component 12 from moving freely inside the battery and causing short circuits or other malfunctions with other components, further ensuring the safety of the battery.

[0062] In some embodiments, reference Figure 4 , Figure 5 The section of the mounting part 100 located on one side of the axis is a Z-shaped bend structure; the peripheral edge of the inner conductive element 12 extends to the outside of the bend of the mounting part 100 and fits and abuts against the mounting part 100.

[0063] In this embodiment, the stepped structure formed by the Z-shaped bending structure serves to limit the movement of the inner conductive element 12. When the contact portion 110 tends to detach from the inner conductive element 12 under the action of the deforming portion 120, the inner conductive element 12 is blocked by the bending point of the mounting portion 100 and cannot move with the contact portion 110, thereby ensuring that the contact portion 110 and the inner conductive element 12 can be reliably separated.

[0064] In some embodiments, reference Figure 2 , Figure 5 The contact portion 110 includes a thinning region 1101, the thickness of which is less than that of other parts of the contact portion 110. The thinning region 1101 is spot-welded to the inner conductive element 12. The inner conductive element 12 is used to electrically connect to the electrode tab at a position corresponding to the thinning region 1101.

[0065] In this embodiment, under normal operating conditions, the spot welding connection method can provide a stable and reliable connection between the thinned region 1101 and the internal conductive component 12, ensuring normal current conduction. When the gas pressure reaches a predetermined value, due to the small force-bearing surface at the spot weld, the corresponding spot weld will bear greater stress, thereby ensuring that a hole is generated at the spot weld in the thinned region 1101 for pressure relief, improving the stability of the pressure relief protection mechanism.

[0066] Thirdly, embodiments of this application provide a battery cell including the battery cap 1 of any of the above-mentioned claims. Therefore, it also includes the advantages of the battery cap 1 of any of the above-mentioned claims.

[0067] In the description of this application, 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 technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0068] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0069] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0070] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A protector (10) for being arranged on a battery cap (1), the battery cap (1) comprising an outer conductive member (11) and an inner conductive member (12); characterized in that, The protective element (10) includes: The mounting part (100) is used to be fixedly installed on the battery cap (1) and to maintain an electrical connection with the external conductive part (11); The contact portion (110) is used to make electrical contact with the inner conductive element (12) under normal conditions; The deformable part (120) is integrally connected between the mounting part (100) and the contact part (110); The deformable part (120) is configured to deform when the internal pressure of the battery reaches a set threshold, thereby causing the contact part (110) to separate from the internal conductive element (12) and thus achieving power failure protection.

2. The protective element (10) according to claim 1, characterized in that, The mounting portion (100), the contact portion (110), and the deformable portion (120) are all sheet-like structures; the thickness of the deformable portion (120) is less than the thickness of the mounting portion (100) and / or the contact portion (110).

3. The protective element (10) according to claim 2, characterized in that, Meet at least one of the following: The thickness of the mounting part (100) is L1, 0.15mm≤L1≤0.3mm; The thickness of the contact portion (110) is L2, where 0.15mm ≤ L2 ≤ 0.3mm; The thickness of the deformable part (120) is L3, 0.075mm≤L3≤0.15mm; The ratio of the thickness of the deformable part (120) to the thickness of the mounting part (100) is L3 / L1, where 0.3 ≤ L3 / L1 ≤ 0.7; The ratio of the thickness of the deformable part (120) to the thickness of the contact part (110) is L3 / L2, where 0.3 ≤ L3 / L2 ≤ 0.

7.

4. The protective element (10) according to claim 1, characterized in that, The mounting portion (100) is arranged around an axis; the deformable portion (120) extends inward from the inner edge of the mounting portion (100), and the contact portion (110) is disposed in the inner region of the deformable portion (120); under normal conditions, the contact portion (110) is closer to the inner conductive element (12) than the mounting portion (100).

5. The protective element (10) according to claim 4, characterized in that, The deformable part (120) is a truncated cone cylindrical structure. The large-diameter end of the truncated cone cylindrical structure is connected to the mounting part (100), and the small-diameter end is connected to the contact part (110). The generatrix inclination angle θ of the truncated cone cylindrical structure satisfies 14°≤θ≤45°.

6. The protective element (10) according to claim 5, characterized in that, A cross-section is taken along the axis, and the cross-section of the mounting part (100) located on one side of the axis is a Z-shaped bending structure. The end of the mounting part (100) near the inner conductive element (12) is connected to the deformable part (120).

7. The protective element (10) according to any one of claims 1 to 6, characterized in that, The contact portion (110) has a sheet-like structure and includes a thinning region (1101). The thickness of the thinning region (1101) is less than that of the other parts of the contact portion (110). The thinning region (1101) is used to make conductive contact with and fix the inner conductive element (12).

8. The protective element (10) according to claim 7, characterized in that, The thinning area (1101) is formed by providing a groove (1102) on the side of the contact portion (110) away from the inner conductive element (12).

9. The protective element (10) according to claim 7, characterized in that, Meet at least one of the following: The thickness of the thinning region (1101) is L4, where 0.25 mm ≤ L4 ≤ 1 mm; The thickness of the other parts of the contact portion (110) is L5, where 1.5 mm ≤ L5 ≤ 3 mm; The ratio of the thickness of the thinned region (1101) to the thickness of the other parts of the contact portion (110) is L4 / L5, where 0.08≤L4 / L5≤0.

67.

10. The protective element (10) according to claim 7, characterized in that, The ratio of the projected area S1 of the thinning region (1101) on the contact portion (110) to the total area S2 of the contact portion (110) satisfies: 0.3≤S1 / S2≤0.

7.

11. A battery cap (1), characterized in that, Includes the protective element (10) as described in any one of claims 1 to 10; further includes: The cover (13) has a receiving cavity (131), and the protective member (10) is disposed in the receiving cavity (131) and is sealed to the inner wall of the cover (13); An external conductive element (11) is disposed on the cover (13) and is used to form the terminal post of the battery cell; An internal conductive element (12) is disposed on the cover (13) and is used to electrically connect the tabs of the battery cells; The protective element (10) is electrically connected between the outer conductive element (11) and the inner conductive element (12).

12. The battery cap (1) according to claim 11, characterized in that, The internal conductive element (12) is fixedly connected to the contact portion (110) and abuts against the mounting portion (100); The cover (13) has a stop (132) in the accommodating cavity (131), and the inner conductive element (12) is located between the stop (132) and the protective element (10) and is movably disposed in the accommodating cavity (131).

13. The battery cap (1) according to claim 12, characterized in that, A cross section is taken along the axis of the protective member (10), and the cross section of the mounting part (100) located on one side of the axis has a Z-shaped bending structure; the peripheral edge of the inner conductive member (12) extends to the outside of the bending structure of the mounting part (100) and is adapted to abut against the mounting part (100).

14. The battery cap (1) according to claim 11, characterized in that, The contact portion (110) includes a thinning area (1101), which is spot-welded to the inner conductive element (12); the inner conductive element (12) is used to electrically connect to the tab at a position corresponding to the thinning area (1101).

15. A single battery cell, characterized in that, Includes the battery cap (1) as described in any one of claims 11 to 14.

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