Battery cell cover plate assembly, battery cell, and battery pack

Abstract

The application relates to the technical field of batteries and discloses a battery cell cover plate assembly, a battery cell and a battery pack. The battery cell cover plate assembly comprises a cover body with a first surface and a second surface oppositely arranged along a Z direction, the cover body is provided with a relief hole arranged through along the Z direction, a pole column comprising a pole column body and a pole column base arranged at one end of the pole column body, the pole column body is partially arranged in the relief hole, the pole column base is oppositely and spacedly arranged with the second surface, a pressing part connected with the pole column body and oppositely and spacedly arranged with the first surface, an insulating sealing element sleeved on the outside of the pole column body and at least partially arranged in the relief hole, and a protection ring sleeved on the outside of the pole column body and oppositely and spacedly arranged with the pressing part and the insulating sealing element along the Z direction. The application can provide protection for the insulating sealing element in the assembling process by additionally arranging the protection ring sleeved on the outside of the pole column in the battery cell cover plate assembly, so that the insulating sealing element is prevented from being damaged due to deformation under the extrusion of the cover body.

Description

Technical Field

[0001] This invention relates to the field of battery technology, specifically to a cell cover assembly, a cell, and a battery pack. Background Technology

[0002] A battery cell cover assembly typically consists of a terminal post, a pressing part, a top cover plate, an upper plastic sheet, a lower plastic sheet, and a sealing ring. During assembly, the sealing ring is usually first placed on the terminal post, and then the terminal post with the sealing ring is passed through the lower plastic sheet, the aluminum sheet, the upper plastic sheet, and the pressing part in sequence. Finally, the assembly is completed by riveting.

[0003] However, in actual assembly, due to the positioning deviation between the pole and the top cover plate, the top cover plate will squeeze the head of the sealing ring, causing the sealing ring to deform and be damaged, ultimately resulting in the failure of the component seal. Summary of the Invention

[0004] In view of this, the present invention provides a cell cover assembly, a cell, and a battery pack to solve the problem of sealing failure of the cell cover assembly caused by deformation of the sealing ring during assembly.

[0005] In a first aspect, the present invention provides a battery cell cover assembly, comprising:

[0006] The cover body has a first surface and a second surface that are arranged opposite to each other along the Z direction, and the cover body has a clearance hole that is arranged through the Z direction.

[0007] The pole includes a pole body and a pole base disposed at one end of the pole body. A portion of the pole body passes through the clearance hole, and the pole base is disposed at a distance from the second surface.

[0008] The pressing part is connected to the pole body and is spaced apart from the first surface;

[0009] An insulating seal is fitted onto the outside of the pole body and is at least partially located within the clearance hole;

[0010] A protective ring is fitted on the outside of the pole body, and along the Z direction, the opposite sides of the protective ring abut against the pressing part and the insulating seal, respectively.

[0011] Beneficial effects: This invention adds a protective ring sleeved on the outside of the terminal post in the cell cover assembly, so that the protective ring abuts against the pressing part and the insulating seal along the Z direction. This provides protection for the insulating seal during assembly, preventing deformation and damage to the insulating seal under the pressure of the cover body. This ensures the sealing shape and positional stability of the insulating seal in the clearance hole, improves the overall sealing performance of the cell cover assembly, and reduces the risk of sealing failure caused by deformation of the sealing ring. At the same time, the structure is simple in design and can be directly adapted to the existing cell cover assembly process, which is conducive to improving the production yield and reliability of cells and battery packs.

[0012] In one alternative embodiment, on a projection plane perpendicular to the Z direction, the orthographic projection of the end of the insulating seal near the pressing part falls within the orthographic projection range of the protective ring.

[0013] Beneficial effects: The orthographic projection of the end of the insulating seal near the pressing part in the Z direction falls completely within the orthographic projection range of the protective ring. This allows the protective ring to cover the critical stress end of the insulating seal near the pressing part, preventing uneven stress on that end due to exceeding the support range of the protective ring. This further reduces the possibility of excessive local deformation of the insulating seal, strengthens the protection of the insulating seal from a structural matching perspective, more accurately ensures the sealing effect of the cell cover assembly, and reduces the risk of seal failure.

[0014] In one optional embodiment, the pole body includes a support section and a connecting section. The support section is close to the pole base, and the outer diameter of the support section is larger than the outer diameter of the connecting section. A stepped surface is formed at the connection between the support section and the connecting section. The protective ring is located on the stepped surface, and the pressing part is connected to the connecting section.

[0015] Beneficial effects: This invention designs the electrode body as support sections and connecting sections with different outer diameters, forming a stepped surface at the connection point. The protective ring rests on this stepped surface, providing a stable axial positioning reference and preventing displacement along the Z-direction during assembly or use. This design also makes the protective ring's contact force with the insulating seal more stable and concentrated, effectively dispersing the pressure on the insulating seal and further preventing deformation due to force deviation or local overload. Simultaneously, the structural adaptation clarifies the assembly positions of each component, improving the overall assembly accuracy of the assembly and thus more reliably ensuring the sealing performance of the cell cover assembly.

[0016] In one optional embodiment, the cell cover assembly further includes a first plastic component and a second plastic component, wherein the first plastic component is located on the first surface and has a portion located between the cover body and the pressing portion; and the second plastic component is located on the second surface and has a portion located between the cover body and the electrode base.

[0017] Beneficial effects: By adding a first plastic part and a second plastic part, the present invention can further enhance the insulation performance of the component and reduce the risk of electrical conductivity between the pole and the cover body.

[0018] In one optional embodiment, along the Z direction, the thickness of the cover body is n, the thickness of the portion of the first plastic part located between the pressing part and the first surface is b, the thickness of the portion of the second plastic part sandwiched between the second surface and the pole base is m, the height of the support section is h1, and the thickness of the protective ring is h2. The relationship between n, b, m, h1, and h2 satisfies: 0.95≤(h1+h2) / (m+n+b)≤1.05.

[0019] Beneficial Effects: By limiting the ratio of (h1+h2) to (m+n+b) to between 0.95 and 1.05, this invention ensures that the total height of the protective ring and the terminal support section is slightly greater than the total thickness of the cover body, the first plastic part, and the second plastic part. This dimensional design not only allows the protective ring to exert a moderate pre-tightening force on the insulating seal after assembly, preventing deformation and ensuring sealing, but also ensures a tight fit between the terminal, the protective ring, and surrounding components. While improving the structural stability of the cell cover assembly, it also considers the reliability of sealing and conductivity, adapting to the usage requirements under different operating conditions.

[0020] In one alternative embodiment, the cell cover assembly further has one or more of the following features (a) to (v):

[0021] (a) The range of n is 1.5 mm ≤ n ≤ 3 mm;

[0022] (ii) The range of values ​​for b is 0.5mm ≤ b ≤ 1.2mm;

[0023] (iii) The range of values ​​for m is 0.5mm ≤ m ≤ 1.2mm;

[0024] (iv) The range of h1 is 2.2mm ≤ h1 ≤ 5.5mm;

[0025] (v) The range of h2 is 0.5mm≤h2≤1.2mm.

[0026] Beneficial effects: The various size ranges can be adapted to the previous proportional relationship of "0.95≤(h1+h2) / (m+n+b)≤1.05", ensuring that the protective ring can effectively support the insulating seal after assembly without excessively squeezing the components. This ensures the balance of component structural stability, sealing performance and conductivity from the perspective of dimensional visualization, while also facilitating standardized production and improving manufacturing precision and yield.

[0027] In one optional embodiment, on the XY plane, the wall of the clearance hole is provided with an annular flange, and the first plastic part has a positioning protrusion formed around the pole body near the edge of the pole body. The positioning protrusion extends along the Z direction into the clearance hole and abuts against the side of the annular flange near the pressing part. The insulating seal includes a first ring and a second ring connected along the Z direction. The first ring and the second ring are sleeved on the pole body, and the second ring abuts against the pole base. The second ring extends along the Z direction into the clearance hole and abuts against the side of the annular flange away from the pressing part.

[0028] Beneficial effects: The present invention provides an annular flange in the clearance hole of the cover body, which abuts against the positioning protrusion of the first plastic part, so as to accurately position the relative position of the first plastic part and the cover body and avoid the assembly of the two being misaligned; at the same time, the second ring of the insulating seal extends into the clearance hole and abuts against the annular flange, which not only provides radial and axial limit for the insulating seal by means of the annular flange to prevent its displacement or excessive deformation, but also enhances the sealing contact area through the abutment between the flanges, thereby improving the sealing effect; in addition, the second ring abuts against the pole base, further fixing the relative position of the insulating seal and the pole. The overall structure, through multi-point positioning and sealing cooperation, greatly improves the assembly accuracy, structural stability and sealing reliability of the cell cover assembly.

[0029] In one alternative embodiment, the protective ring is made of the same material as the cover body or the pole.

[0030] Beneficial effects: The present invention sets the material of the protective ring to be the same as that of the cover body or the pole and has good conductivity, which can ensure that the conductivity performance between the protective ring and the cover body and the pole is matched, avoid the problem of excessive contact resistance due to material differences, and stabilize the overall conductivity efficiency of the component.

[0031] Secondly, the present invention also provides a battery cell, comprising:

[0032] The housing has a cavity and an opening communicating with the cavity;

[0033] The pole group is located within the cavity;

[0034] The aforementioned cell cover assembly covers and seals the opening, and the electrode post is electrically connected to the electrode group.

[0035] Beneficial effects: The battery cell of the present invention includes the battery cell cover assembly as described above, and has all the beneficial technical effects of the battery cell cover assembly, which will not be repeated here.

[0036] Thirdly, the present invention also provides a battery pack comprising: a plurality of the above-described battery cells.

[0037] Beneficial effects: The battery pack of the present invention includes the battery cell as described above and has all the beneficial technical effects of the battery cell, which will not be repeated here. Attached Figure Description

[0038] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the structure of a battery cell cover assembly according to an embodiment of the present invention;

[0040] Figure 2 for Figure 1 Cross-sectional view from the perspective of angle AA;

[0041] Figure 3 for Figure 2 A magnified view of part B in the diagram;

[0042] Figure 4 for Figure 1 An exploded view of the battery cell cover assembly shown.

[0043] Figure 5 for Figure 4 A cross-sectional view of the pole shown;

[0044] Figure 6 for Figure 4 A cross-sectional view of the insulating seal shown;

[0045] Figure 7 for Figure 4 The cross-sectional view of the protective ring shown.

[0046] Explanation of reference numerals in the attached figures:

[0047] 1. Cover body; 101. First surface; 102. Second surface; 103. Clearance hole; 1031. Annular flange; 2. Pole post; 201. Pole post body; 2011. Support section; 2012. Connecting section; 2013. Stepped surface; 202. Pole post base; 3. Pressing part; 4. Insulating seal; 401. First ring; 402. Second ring; 5. Protective ring; 6. First plastic part; 601. First mounting groove; 602. First through hole; 603. Positioning protrusion; 7. Second plastic part; 701. Second mounting groove; 702. Second through hole. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] The following is combined Figures 1 to 7 The following describes embodiments of the present invention.

[0050] For ease of description later, such as Figure 4 As shown, a spatial rectangular coordinate system is established: the thickness direction of the cell cover assembly extends along the Z-axis; the length direction of the cell cover assembly extends along the X-axis; and the width direction of the cell cover assembly extends along the Y-axis.

[0051] According to embodiments of the present invention, in one aspect, such as Figures 1 to 7 As shown, a battery cell cover assembly is provided, including: a cover body 1, an electrode post 2, a pressing part 3, an insulating seal 4, and a protective ring 5.

[0052] Specifically, the cover body 1 has a first surface 101 and a second surface 102 arranged opposite to each other along the Z direction, and the cover body 1 has a clearance hole 103 that is arranged through along the Z direction; the pole post 2 includes a pole post body 201 and a pole post base 202 arranged at one end of the pole post body 201, a portion of the pole post body 201 is inserted into the clearance hole 103, and the pole post base 202 is arranged at a distance from the second surface 102; the pressing part 3 is connected to the pole post body 201 and is arranged at a distance from the first surface 101; the insulating seal 4 is sleeved on the outside of the pole post body 201 and is at least partially located in the clearance hole 103; the protective ring 5 is sleeved on the outside of the pole post body 201, and along the Z direction, the opposite sides of the protective ring 5 abut against the pressing part 3 and the insulating seal 4 respectively.

[0053] This invention provides protection for the insulating seal 4 during assembly by adding a protective ring 5 sleeved on the outside of the terminal post 2 in the cell cover assembly. The protective ring 5 abuts against the pressing part 3 and the insulating seal 4 along the Z direction. This protects the insulating seal 4 from deformation and damage under the pressure of the cover body 1, thereby ensuring the sealing shape and positional stability of the insulating seal 4 in the clearance hole 103, improving the overall sealing performance of the cell cover assembly, and reducing the risk of sealing failure due to deformation of the sealing ring. At the same time, this structure is simple in design and can be directly adapted to the existing cell cover assembly process, which is conducive to improving the production yield and reliability of cells and battery packs.

[0054] Specifically, in this embodiment, the pressing part 3 can be a riveting block, which is sleeved on the outside of the pole body 201 and riveted or welded to the pole body 201.

[0055] Specifically, in this embodiment, the cross-sectional shape of the electrode body 201 can be cylindrical or racetrack-shaped. It is understood that to ensure the sealing and compatibility of the cell cover assembly, the shapes of the clearance hole 103 and the inner hole of the insulating seal 4 need to match the cross-sectional shape of the electrode body 201. Specifically, if the electrode body 201 is cylindrical, the relevant holes and the inner hole of the insulating seal 4 also need to be designed as circular to ensure no gaps between them to avoid sealing failure; if... Figure 4 As shown, if it is a racetrack shape, the corresponding hole and the inner hole of the insulating seal 4 must also adopt a racetrack shape structure. This not only adapts to the installation requirements of the pole post 2, but also reduces gaps through shape fit. At the same time, the racetrack shape design can also optimize the conductive area and structural strength of the pole post 2 in a specific space, ensuring that while meeting different assembly scenarios and performance requirements, the sealing reliability and structural adaptability of the component are always maintained.

[0056] According to one embodiment of the present invention, on a projection plane perpendicular to the Z direction, the orthographic projection of the end of the insulating seal 4 near the pressing part 3 falls within the orthographic projection range of the protective ring 5. It can be understood that the complete orthographic projection of the end of the insulating seal 4 near the pressing part 3 in the Z direction falling within the orthographic projection range of the protective ring 5 allows the protective ring 5 to cover the critical force-bearing end of the insulating seal 4 near the pressing part 3, preventing uneven force distribution at that end due to exceeding the support range of the protective ring 5. This further reduces the possibility of excessive local deformation of the insulating seal 4, strengthens the protection of the insulating seal 4 from a structural matching perspective, more accurately ensures the sealing effect of the cell cover assembly, and reduces the risk of seal failure.

[0057] According to one embodiment of the present invention, such as Figure 4 and Figure 5 As shown, the pole body 201 includes a support section 2011 and a connecting section 2012. The support section 2011 is close to the pole base 202. The outer diameter of the support section 2011 is larger than the outer diameter of the connecting section 2012. A stepped surface 2013 is formed at the connection between the support section 2011 and the connecting section 2012. The protective ring 5 is located on the stepped surface 2013. The pressing part 3 is connected to the connecting section 2012.

[0058] In this embodiment of the invention, the electrode body 201 is designed as a support section 2011 and a connecting section 2012 with different outer diameters, and a stepped surface 2013 is formed at the connection between the two. The protective ring 5 rests on the stepped surface 2013, providing a stable axial positioning reference for the protective ring 5 and preventing displacement along the Z-direction during assembly or use. This design also makes the contact support force of the protective ring 5 on the insulating seal 4 more stable and concentrated, effectively dispersing the pressure on the insulating seal 4 and further preventing deformation due to force offset or local overload. Simultaneously, the structural adaptation clarifies the assembly positions of each component, improving the overall assembly accuracy of the assembly, thereby more reliably ensuring the sealing performance of the cell cover assembly.

[0059] According to one embodiment of the present invention, such as Figure 2 and Figure 4 As shown, the battery cell cover assembly also includes a first plastic part 6 and a second plastic part 7. The first plastic part 6 is located on the first surface 101 and is partially located between the cover body 1 and the pressing part 3; the second plastic part 7 is located on the second surface 102 and is partially located between the cover body 1 and the terminal base 202.

[0060] Furthermore, such as Figure 2 and Figure 4 As shown, the first plastic part 6 has a first mounting groove 601 on the side away from the cover body 1, and the pressing part 3 is installed in the first mounting groove 601. A first through hole 602 communicating with the clearance hole 103 is formed on the bottom of the first mounting groove 601. The second plastic part 7 has a second mounting groove 701 on the side away from the cover body 1, and the pole post base 202 is installed in the second mounting groove 701. A second through hole 702 communicating with the clearance hole 103 is formed on the bottom of the first mounting groove 601.

[0061] It is understood that by adding a first plastic part 6 and a second plastic part 7, and respectively providing a first mounting groove 601 and a second mounting groove 701 on both, the embodiments of the present invention can provide precise installation and positioning space for the pressing part 3 and the pole base 202, preventing displacement of the two during assembly or use and ensuring the overall structural stability of the component. At the same time, the provision of the first through hole 602 and the second through hole 702 ensures that the pole body 201 can be smoothly inserted, and the plastic parts can further enhance the insulation performance of the component, reducing the risk of electrical conductivity between the pole 2 and the cover body 1. While improving assembly accuracy and structural stability, it also takes into account insulation protection, further ensuring the safety and sealing reliability of the cell cover assembly.

[0062] According to one embodiment of the present invention, such as Figure 2 , Figure 5 as well as Figure 6As shown, along the Z direction, the thickness of the cover body 1 is n, the thickness of the portion of the first plastic part 6 located between the pressing part 3 and the first surface 101 is b, the thickness of the portion of the second plastic part 7 sandwiched between the second surface 102 and the pole base 202 is m, the height of the support section 2011 is h1, and the thickness of the protective ring 5 is h2. The relationship between n, b, m, h1 and h2 satisfies: 0.95≤(h1+h2) / (m+n+b)≤1.05.

[0063] In this embodiment of the invention, by limiting the ratio of (h1+h2) to (m+n+b) to between 0.95 and 1.05, the total height of the protective ring 5 and the support section 2011 of the pole post 2 is slightly greater than the total thickness of the cover body 1, the first plastic part 6, and the second plastic part 7. This dimensional design not only allows the protective ring 5 to exert a moderate pre-tightening force on the insulating seal 4 after assembly, preventing deformation and ensuring sealing, but also ensures a tight fit between the pole post 2, the protective ring 5, and the surrounding components. While improving the structural stability of the cell cover assembly, it also considers the reliability of sealing and conductivity, adapting to the usage requirements under different operating conditions.

[0064] It can be understood that the ratio of (h1+h2) / (m+n+b) can be, but is not limited to, 0.95, 0.96, 0.97, 0.98, 0.99, 1, 1.01, 1.02, 1.03, 1.04, 1.05 or any value between the two.

[0065] According to one embodiment of the present invention, the cell cover assembly further has one or more of the following features (a) to (v):

[0066] (a) The range of n is 1.5 mm ≤ n ≤ 3 mm;

[0067] (ii) The range of values ​​for b is 0.5mm ≤ b ≤ 1.2mm;

[0068] (iii) The range of values ​​for m is 0.5mm ≤ m ≤ 1.2mm;

[0069] (iv) The range of h1 is 2.2mm ≤ h1 ≤ 5.5mm;

[0070] (v) The range of h2 is 0.5mm≤h2≤1.2mm.

[0071] It is understandable that the various size ranges can be adapted to the previous proportional relationship of "0.95≤(h1+h2) / (m+n+b)≤1.05", ensuring that the protective ring 5 can effectively support the insulating seal 4 after assembly without excessively squeezing the components. This ensures the balance of component structural stability, sealing performance and conductivity from the perspective of dimensional representation, while also facilitating standardized production and improving manufacturing precision and yield.

[0072] According to one embodiment of the present invention, such as Figure 3 As shown, the portion of the support section 2011 extending out of the clearance hole 103 is located within the first through hole 602, and the protective ring 5 is located within the first through hole 602 with its outer side wall abutting against the hole wall of the first through hole 602. It can be understood that by placing the portion of the support section 2011 extending out of the clearance hole 103 within the first through hole 602, and placing the protective ring 5 within the first through hole 602 with its outer side wall abutting against the hole wall of the first through hole 602, this embodiment of the invention provides radial restraint for the protective ring 5 using the hole wall of the first through hole 602, preventing the protective ring 5 from radially shifting or wobbling, and ensuring its precise support position for the insulating seal 4. Furthermore, it allows the support section 2011, the protective ring 5, and the first through hole 602 of the first plastic part 6 to form a compact assembly structure, reducing the gap between components. This strengthens the stable support of the protective ring 5 for the insulating seal 4 to ensure sealing performance, and also improves the overall structural compactness and vibration resistance of the assembly, further optimizing the reliability of the cell cover assembly.

[0073] According to one embodiment of the present invention, such as Figure 3 As shown, on the XY plane, an annular flange 1031 is provided on the wall of the clearance hole 103. The first plastic part 6 forms a positioning protrusion 603 around the pole body 201 near the edge of the pole body 201. The positioning protrusion 603 extends along the Z direction into the clearance hole 103 and abuts against the side of the annular flange 1031 near the pressing part 3. The insulating seal 4 includes a first ring 401 and a second ring 402 connected along the Z direction. The first ring 401 and the second ring 402 are sleeved on the outside of the pole body 201. The second ring 402 abuts against the pole base 202. The second ring 402 extends along the Z direction into the clearance hole 103 and abuts against the side of the annular flange 1031 away from the pressing part 3. It is understood that in this embodiment of the invention, an annular flange 1031 is provided in the clearance hole 103 of the cover body 1, and it abuts against the positioning protrusion 603 of the first plastic part 6, which can accurately position the relative position of the first plastic part 6 and the cover body 1, and avoid the assembly of the two being misaligned; at the same time, the second ring layer 402 of the insulating seal 4 extends into the clearance hole 103 and abuts against the annular flange 1031, which not only provides radial and axial limit for the insulating seal 4 by means of the annular flange 1031 to prevent its displacement or excessive deformation, but also enhances the sealing contact area through the abutment between the flanges, thereby improving the sealing effect; in addition, the second ring layer 402 abuts against the pole base 202, further fixing the relative position of the insulating seal 4 and the pole 2. The overall structure, through multi-point positioning and sealing cooperation, greatly improves the assembly accuracy, structural stability and sealing reliability of the battery cell cover assembly.

[0074] According to one embodiment of the present invention, the material of the protective ring 5 is the same as that of the cover body 1 or the electrode post 2. By setting the material of the protective ring 5 to be the same as that of the cover body 1 or the electrode post 2 and possessing good conductivity, this embodiment of the present invention ensures that the conductivity performance between the protective ring 5 and the cover body 1 or the electrode post 2 is matched, avoiding the problem of excessive contact resistance due to material differences, and stabilizing the overall conductivity efficiency of the component.

[0075] According to an embodiment of the present invention, in a second aspect, a battery cell is also provided, comprising: a housing, an electrode assembly, and the aforementioned battery cell cover plate assembly.

[0076] Specifically, the housing has a cavity and an opening connected to the cavity; the electrode group is located inside the cavity; the aforementioned cell cover plate assembly covers and seals the opening, and the pole post 2 is electrically connected to the electrode group.

[0077] The battery cell of this embodiment includes the battery cell cover assembly as described above, and has all the beneficial technical effects of the battery cell cover assembly, which will not be repeated here.

[0078] It should be noted that the battery cell in this embodiment can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this application embodiment is not limited to this.

[0079] According to an embodiment of the present invention, a third aspect also provides a battery pack comprising: a plurality of the above-described battery cells.

[0080] The battery pack of this invention includes the battery cell described above and has all the beneficial technical effects of the battery cell, which will not be repeated here.

[0081] The battery pack of this invention includes the battery cell described above and has all the beneficial technical effects of the battery cell, which will not be repeated here.

[0082] The technical effects of the present invention will be described below with reference to some embodiments and comparative examples.

[0083] The thickness of the cover body 1 is n=2mm, the thickness of the second plastic part 7 sandwiched between the second surface 102 and the pole base 202 is m=0.7mm, and the thickness of the first plastic part 6 located between the pressing part 3 and the first surface 101 is b=0.7mm; the height of the support section 2011 is h1=2.8mm, and the thickness of the protective ring 5 is h2. Different values ​​are used to verify whether the resistance value between the pressing part 3 and the cover body 1 and the flatness value of the pressing part 3 meet the usage requirements (resistance ≤0.035mΩ, flatness ≤0.2mm). The test results are shown in Table 1.

[0084] Table 1 Test Results 1

[0085]

[0086] The thickness of the cover body 1 is n=2mm, the thickness of the second plastic part 7 sandwiched between the second surface 102 and the pole base 202 is m=0.7mm, and the thickness of the first plastic part 6 located between the pressing part 3 and the first surface 101 is b=0.5mm; the height of the support section 2011 is h1=2.5mm, and the thickness of the protective ring 5 is h2. Different values ​​are used to verify whether the resistance value between the pressing part 3 and the cover body 1 and the flatness value of the pressing part 3 meet the usage requirements (resistance ≤0.035mΩ, flatness ≤0.2mm). The test results are shown in Table 2.

[0087] Table 2 Test Results 2

[0088]

[0089] The thickness of the cover body 1 is n=2.5mm, the thickness of the second plastic part 7 sandwiched between the second surface 102 and the pole base 202 is m=0.7mm, and the thickness of the first plastic part 6 located between the pressing part 3 and the first surface 101 is b=0.7mm; the height of the support section 2011 is h1=3.2mm, and the thickness of the protective ring 5 is h2. Different values ​​are used for verification. The resistance value between the pressing part 3 and the cover body 1 and the flatness value of the pressing part 3 are tested to see if they meet the usage requirements (resistance ≤0.035mΩ, flatness ≤0.2mm). The test results are shown in Table 3.

[0090] Table 3 Test Results 3

[0091]

[0092] As shown in Tables 1 to 3, when (h1+h2) / (m+n+b) is in the range of 0.95~1.05, the resistance value between the pressing part 3 and the cover body 1 and the flatness of the pressing part 3 meet the usage requirements.

[0093] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A cell cover assembly, characterized in that, include: The cover body has a first surface and a second surface that are arranged opposite to each other along the Z direction, and the cover body has a clearance hole that is arranged through the Z direction. The pole includes a pole body and a pole base disposed at one end of the pole body. A portion of the pole body passes through the clearance hole, and the pole base is disposed at a distance from the second surface. The pressing part is connected to the pole body and is spaced apart from the first surface; An insulating seal is fitted onto the outside of the pole body and is at least partially located within the clearance hole; A protective ring is fitted on the outside of the pole body, and along the Z direction, the opposite sides of the protective ring abut against the pressing part and the insulating seal, respectively. The pole body includes a support section and a connecting section. The support section is close to the pole base. The outer diameter of the support section is larger than the outer diameter of the connecting section. A stepped surface is formed at the connection between the support section and the connecting section. The protective ring is located on the stepped surface. The pressing part is connected to the connecting section. The cell cover assembly further includes a first plastic component and a second plastic component. The first plastic component is located on the first surface and has a portion located between the cover body and the pressing part. The second plastic component is located on the second surface and has a portion located between the cover body and the electrode base. Along the Z direction, the thickness of the cover body is n, the thickness of the portion of the first plastic part located between the pressing part and the first surface is b, the thickness of the portion of the second plastic part sandwiched between the second surface and the pole base is m, the height of the support section is h1, and the thickness of the protective ring is h2. The relationship between n, b, m, h1, and h2 satisfies: 0.95≤(h1+h2) / (m+n+b)≤1.

05.

2. The cell cover assembly according to claim 1, characterized in that, On a projection plane perpendicular to the Z direction, the orthographic projection of the end of the insulating seal near the pressing part falls within the orthographic projection range of the protective ring.

3. The cell cover assembly according to claim 1, characterized in that, The cell cover assembly also has one or more of the following features (i) to (v): (a) The range of n is 1.5 mm ≤ n ≤ 3 mm; (ii) The range of values ​​for b is 0.5mm ≤ b ≤ 1.2mm; (iii) The range of values ​​for m is 0.5mm ≤ m ≤ 1.2mm; (iv) The range of h1 is 2.2mm ≤ h1 ≤ 5.5mm; (v) The range of h2 is 0.5mm≤h2≤1.2mm.

4. The cell cover assembly according to claim 1, characterized in that, On the XY plane, the wall of the clearance hole is provided with an annular flange. The first plastic part has a positioning protrusion formed around the pole body near the edge of the pole body. The positioning protrusion extends along the Z direction into the clearance hole and abuts against the side of the annular flange near the pressing part. The insulating seal includes a first ring and a second ring connected along the Z direction. The first ring and the second ring are sleeved on the pole body. The second ring abuts against the pole base. The second ring extends along the Z direction into the clearance hole and abuts against the side of the annular flange away from the pressing part.

5. The cell cover assembly according to any one of claims 1 to 4, characterized in that, The protective ring is made of the same material as the cover body or the pole.

6. A battery cell, characterized in that, include: The housing has a cavity and an opening communicating with the cavity; The pole group is disposed within the cavity; The cell cover assembly according to any one of claims 1 to 5 covers and seals the opening, and the electrode post is electrically connected to the electrode group.

7. A battery pack, characterized in that, include: The battery cell as described in several claims 6.

Images