Cover plate structure and battery

Abstract

The invention provides a cover plate structure and a battery, relates to the field of lithium batteries, and aims to optimize the cover plate structure to a certain extent and improve the over-current capability of a pole in a limited space. The cover plate structure provided by the invention comprises a pole, a middle assembly and a welding block, the pole and the welding block are oppositely arranged on the two sides of the middle assembly, the pole comprises a base part and a connecting part, one end of the connecting part is connected with the base part, and the other end of the connecting part penetrates through the middle assembly to be welded to the welding block; the size of the connecting part in the length direction of the base part is B, the size of the connecting part in the width direction of the base part is A, and B > A is satisfied.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and in particular to a cover structure and a battery. Background Art

[0002] Due to the relatively mature technology, fast charging and large overcurrent are the current hotspots in the development of lithium-ion batteries.

[0003] In the prior art, increasing the cross-sectional area of the pole column is often used to increase the overcurrent capacity of the pole column. However, the pole column is usually designed to be cylindrical. Due to the limitation of the width dimension of the cover plate, the diameter of the pole column is also limited, resulting in that the cross-sectional area of the pole column cannot be increased arbitrarily, and thus the requirement of higher overcurrent capacity cannot be met.

[0004] Therefore, there is an urgent need to provide a cover structure and a battery to solve the problems existing in the prior art to a certain extent. Summary of the Invention

[0005] The purpose of the present invention is to provide a cover structure and a battery to optimize the cover structure to a certain extent and improve the overcurrent capacity of the pole column in a limited space.

[0006] A cover structure provided by the present invention includes a pole column, an intermediate component, and a welding block; the pole column and the welding block are oppositely arranged on both sides of the intermediate component. The pole column includes a base portion and a connecting portion. One end of the connecting portion is connected to the base portion, and the other end passes through the intermediate component and is welded to the welding block; the dimension of the connecting portion in the length direction of the base portion is B, and the dimension of the connecting portion in the width direction of the base portion is A, satisfying B > A.

[0007] Wherein, the welding block is formed with a welding hole, and the welding hole is adapted to the connecting portion to form a weld seam in the circumferential direction of the connecting portion.

[0008] Specifically, the welding block is formed with a counterbore portion, the depth of the counterbore portion is e, and the distance between the side wall of the counterbore portion and the weld seam is d, satisfying 0.2 mm ≤ e ≤ 0.5 mm and 0.5 mm ≤ d ≤ 1.5 mm.

[0009] Wherein, the cover structure provided by the present invention further includes a sealing member. The sealing member includes an extended section and a covering section. The covering section is sleeved on the connecting portion, and the extended section is attached to the base portion. The sealing member is located between the pole column and the intermediate component and is used to separate and seal the pole column and the intermediate component.

[0010] Specifically, the intermediate component includes a first plastic part, the first plastic part is formed with a via hole and a positioning groove, the base part is embedded in the positioning groove, and the positioning groove is connected with the via hole, so that the connecting part can pass through the via hole.

[0011] Specifically, the intermediate component also includes a top cover sheet, which is arranged on the side of the first plastic part away from the pole, and the top cover sheet is formed with a through hole at the position corresponding to the through hole, the connecting part and the covering section sleeved outside the connecting part both pass through the through hole, and the edge of the top cover sheet corresponding to the through hole is crimped onto the extension section.

[0012] Furthermore, the thickness of the expansion section in the non-compressed state is b, the thickness in the compressed state is c, and the compression amount of the expansion section is Satisfied: 10% ≤ ≤50%.

[0013] Furthermore, the perimeter of the weld is D, the penetration is a, the pressing area of ​​the extension section and the top cover sheet is S, and when the compression amount of the extension section is 10%≤ <25%, the welding penetration a formed between the connecting portion and the welding block satisfies: 0<S·16( )≤(0.6~0.8) ·D·a; when the compression of the expansion section is 25%≤ ≤50%, the welding penetration a formed by the connecting portion and the welding block satisfies: 0<S·(260 -120 ( )+18)≤(0.6~0.8) ·D·a; where It is the tensile strength of the material of the pole, in MPa.

[0014] Furthermore, the intermediate component also includes a second plastic part, which is formed with an alignment hole corresponding to the position of the perforation, and the center of the alignment hole is coaxially arranged with the center of the perforation; the second plastic part is arranged on the side of the top cover sheet away from the first plastic part, and is in contact with the top cover sheet; the second plastic part is formed with a receiving groove on the side of the second plastic part away from the top cover sheet, and the welding block is arranged in the receiving groove.

[0015] Compared with the prior art, the cover plate structure provided by the present invention has the following advantages: The cover plate structure provided by the present invention includes a pole column, an intermediate component, and a welding block; the pole column and the welding block are oppositely arranged on both sides of the intermediate component. The pole column includes a base portion and a connecting portion. One end of the connecting portion is connected to the base portion, and the other end passes through the intermediate component and is welded to the welding block; the dimension of the connecting portion in the length direction of the base portion is B, and the dimension of the connecting portion in the width direction of the base portion is A, satisfying B > A.

[0016] From this analysis, it can be seen that the base portion can provide a foundation for the connecting portion. By enabling the end of the connecting portion far from the base portion to pass through the intermediate component and be welded to the welding block, stable connection and assembly among the pole column, the intermediate component, and the welding block can be achieved.

[0017] Moreover, since the dimension of the connecting portion in the length direction of the base portion in this application is B, and the dimension in the width direction is A, and B > A, that is, the length of the connecting portion is greater than the width, the dimension of the base portion in the length direction can be fully utilized to increase the volume of the overall connecting portion. Thus, compared with the existing cylindrical pole column structure, a connecting portion with a larger volume can be formed within the same design space, thereby increasing the current-carrying area of the overall pole column to a certain extent and improving the battery performance.

[0018] In addition, the present invention also provides a battery including the above-mentioned cover plate structure.

[0019] The battery adopting the cover plate structure provided by this application can have a more excellent current-carrying capacity, thereby being able to improve the supply of the battery to the requirements of higher-power devices to a certain extent. Description of the Drawings

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a schematic exploded view of the cover plate structure provided by the embodiment of the present invention; Figure 2 It is a schematic structural view of the pole column in the cover plate structure provided by the embodiment of the present invention; Figure 3 It is a partial sectional view of the pole column assembly in the cover plate structure provided by the embodiment of the present invention; Figure 4 It is a schematic view of the cooperation between the sealing member and the top cover sheet in the cover plate structure provided by the embodiment of the present invention; Figure 5 It is a partial sectional view of the cover plate structure provided by the embodiment of the present invention; Figure 6 This is an assembly schematic diagram of a sealing member and a top cover sheet in the cover structure provided by the embodiment of the present invention.

[0022] In the figure: 1 - pole column; 101 - base part; 102 - connecting part; 2 - sealing member; 201 - extended section; 202 - covering section; 3 - first plastic part; 301 - through hole; 302 - positioning groove; 4 - top cover sheet; 401 - perforation; 5 - second plastic part; 501 - alignment hole; 502 - receiving groove; 6 - welding block; 601 - counterbore part; 7 - weld seam. Detailed implementation manners

[0023] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part rather than all of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents selected embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application.

[0024] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the inventive product is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0025] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0026] In the description of the embodiments of the present application, it should also be noted that, unless otherwise clearly specified and limited, the terms "arranged", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0027] As used herein, the term "and / or" includes any one of the listed related items and any combination of any two or more of them.

[0028] For ease of description, spatial relationship terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship between one element and another as shown in the drawings. Such spatial relationship terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the drawings.

[0029] The terms used herein are only for describing various examples and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. The terms "comprises", "comprising", and "having" list the stated features, quantities, operations, components, elements, and / or combinations thereof that exist, but do not preclude the existence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0030] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Accordingly, the examples described herein are not limited to the specific shapes shown in the drawings, but include changes in shape that occur during manufacturing.

[0031] The features of the examples described herein can be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application. Additionally, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0032] As Figures 1 - 3As shown in the figure, the present invention provides a cover plate structure, which includes a terminal 1, an intermediate component, and a welding block 6; the terminal 1 and the welding block 6 are oppositely arranged on both sides of the intermediate component. The terminal 1 includes a base portion 101 and a connecting portion 102. One end of the connecting portion 102 is connected to the base portion 101, and the other end passes through the intermediate component and is welded to the welding block 6; the dimension of the connecting portion 102 in the length direction of the base portion 101 is B, and the dimension of the connecting portion 102 in the width direction of the base portion 101 is A, satisfying B > A.

[0033] Compared with the prior art, the cover plate structure provided by the present invention has the following advantages: For the cover plate structure provided by the present invention, the base portion 101 can provide a foundation for the connecting portion 102. By making the end of the connecting portion 102 far from the base portion 101 pass through the intermediate component and be welded to the welding block 6, stable connection and assembly among the terminal 1, the intermediate component, and the welding block 6 can be achieved.

[0034] Moreover, since the dimension of the connecting portion 102 in the length direction of the base portion 101 in this application is B, and the dimension in the width direction is A, and B > A, that is, the length of the connecting portion 102 is greater than the width, the dimension of the base portion 101 in the length direction can be fully utilized to increase the volume of the overall connecting portion 102. Thus, compared with the existing cylindrical terminal 1 structure, a connecting portion 102 with a larger volume can be formed within the same design space, thereby increasing the current-carrying area of the overall terminal 1 to a certain extent and improving the battery performance.

[0035] Optionally, as Figure 1 Combined with Figure 3 shown in the figure, a welding hole is formed in the welding block 6 of this application, and the welding hole is adapted to the connecting portion 102 to form a weld seam 7 in the circumferential direction of the connecting portion 102.

[0036] Preferably, as Figure 3 shown in the figure, a counterbore portion 601 is formed in the welding block 6 of this application. The depth of the counterbore portion 601 is e, and the distance between the side wall of the counterbore portion 601 and the weld seam 7 is d, satisfying 0.2 mm ≤ e ≤ 0.5 mm and 0.5 mm ≤ d ≤ 1.5 mm.

[0037] Since the connecting portion 102 and the welding block 6 in this application are connected by welding, therefore, by forming the counterbore portion 601 on the welding block 6, the welding quality can be guaranteed and the weld mark formed after welding can be accommodated.

[0038] Further preferably, the depth e of the counterbore portion 601 in this application is 0.3 mm, and the distance d between the side wall of the counterbore portion 601 and the weld seam 7 is 1 mm.

[0039] Optionally, as Figure 1 Combined withFigures 3 - 5 As shown, the cover plate structure provided by the present invention also includes a sealing component 2, which includes an extension section 201 and a covering section 202. The covering section 202 is sleeved on the connecting portion 102, and the extension section 201 is in contact with the base portion 101. The sealing component 2 is located between the pole 1 and the intermediate component, and is used to separate and seal the pole 1 and the intermediate component.

[0040] The sealing member 2 in the present application is made of an insulating material, which may be a material such as rubber, which has a certain elasticity to achieve sealing and also has good insulation performance, so that the connection portion 102 of the pole 1 can be separated from the intermediate component to avoid short circuit problems.

[0041] It can be understood that the area of ​​the base portion 101 in the present application is larger, therefore, the cross-sections of the base portion 101 and the connecting portion 102 are T-shaped, so that the extension section 201 formed by the sealing member 2 can increase the contact surface between the sealing member 2 and the base portion 101, and the covering section 202 formed by the sealing member 2 can form a surrounding structure with the connecting portion 102, thereby ensuring the stability of the position of the sealing member 2 and reducing the movement of the sealing member 2 during assembly and use, causing leakage or short circuit of the entire battery.

[0042] After the actual connection, the intermediate component in the present application is pressed onto the extension section 201 , so that the intermediate component is sealed with the connecting portion 102 through the extension section 201 , and is insulated with the connecting portion 102 through the covering section 202 .

[0043] Alternatively, if Figure 1 Combination Figure 5 As shown, the intermediate component in the present application includes a first plastic part 3, which is formed with a through hole 301 and a positioning groove 302. The base part 101 is embedded in the positioning groove 302, and the positioning groove 302 is connected to the through hole 301, so that the connecting part 102 can pass through the through hole 301.

[0044] Preferably, the connection part 102 in the present application is located at the center of the base part 101, so that the force on the entire pole 1 can be more uniform, avoiding the problem of offset and movement during assembly and use. Correspondingly, the via hole 301 in the present application is located at the center of the positioning groove 302, and the positioning groove 302 can provide a bearing space for the base part 101, and when the base part 101 is embedded in the positioning groove 302, the connection part 102 can accurately pass through the via hole 301. The depth of the positioning groove 302 in the present application can be adapted to the thickness of the base part 101, and after the base part 101 is embedded in the positioning groove 302, the side of the base part 101 away from the connection part 102 and the side of the first plastic part 3 away from the top cover sheet 4 are preferably located on the same plane.

[0045] Alternatively, ifFigure 1 Combined Figures 3 - 5 As shown, the intermediate component in the present application further includes a top cover sheet 4. The top cover sheet 4 is disposed on the side of the first plastic part 3 away from the pole column 1. A perforation 401 is formed at the position of the top cover sheet 4 corresponding to the through hole 301. Both the connecting portion 102 and the covering section 202 sleeved outside the connecting portion 102 pass through the perforation 401, and the edge of the top cover sheet 4 corresponding to the perforation 401 is crimped on the extended section 201.

[0046] Preferably, the connecting portion 102 in the present application can be in a kidney-shaped or racetrack-shaped structure. On the basis of increasing the volume and thus increasing the current-carrying area, it can ensure that the intermediate component will not rotate after connection, improving the stability of the overall structure.

[0047] Correspondingly, the through hole 301 and the perforation 401 in the present application are both kidney-shaped or racetrack-shaped holes, so as to be able to adapt to the connecting portion 102.

[0048] It can be understood that the hollow of the perforation 401 formed on the top cover sheet 4 in the present application is collinear with the hollow of the through hole 301, so that the connecting portion 102 can pass through smoothly. Moreover, the size of the perforation 401 in the present application is not less than the sum of the diameters of the connecting portion 102 and the covering section 202 to ensure that the connecting portion 102 and the covering section 202 can jointly pass through the perforation 401.

[0049] When the covering section 202 and the connecting portion 102 pass through the perforation 401, the side of the top cover sheet 4 facing the first plastic part 3 and the edge corresponding to the perforation 401 will abut against the extended section 201. During the further assembly process, the pressing structure will apply a downward pressure to the intermediate component, so that the extended section 201 undergoes compressive deformation, realizing the seal between the top cover sheet 4 and the connecting portion 102.

[0050] Correspondingly, as Figure 4 shown, the thickness of the extended section 201 in the non-compressed state in the present application is b, and the thickness in the compressed state is c. The compression amount of the extended section 201 satisfies: 10% ≤ ≤ 50%.

[0051] When the compression amount of the extended section 201 is less than 10%, the extended section 201 is close to the uncompressed state and the required sealing effect cannot be obtained. When the compression amount exceeds 50%, the extended section 201 is extremely likely to age or be damaged during long-term use or the assembly process, causing the overall sealing member 2 to fail and affecting the use safety of the battery.

[0052] Therefore, in the present application, the compression amount is between 10% - 50%, which can not only ensure the sealing effect but also ensure the service life of the sealing member 2 and improve the stability of the overall structure.

[0053]

[0054] As shown above, the sealing member in this application uses fluororubber material. Based on the above formula, the thickness before compression and the thickness after compression of the extended section 201 are tested. Thus, in Embodiment 1, the compression amount of 10% is the lower limit of the range, but the sealing member can still ensure good airtightness.

[0055] Correspondingly, in Embodiments 2 - 6, the compression amounts are all between 10% and 50%. Therefore, the airtightness of the sealing member can also be ensured. And in Embodiment 6, the compression amount is the upper limit of the range, and the airtightness can also be ensured.

[0056] However, in Comparative Example 1, the compression amount is less than the lower limit of the range. Therefore, it fails to pass the airtightness test during the testing stage, that is, the extended section 201 cannot ensure airtightness.

[0057] In Comparative Example 2, although the compression amount is close to the lower limit of 10% of the range, the extended section 201 still cannot ensure airtightness after testing, and there is a leakage situation.

[0058] In Comparative Examples 3 and 4, the compression amount value in Comparative Example 3 is close to the upper limit of the range. Although it can ensure airtightness, it exceeds the upper limit of the compression amount of fluororubber. When maintaining a high - pressure state for a long time, it causes the fluororubber to crack, thus resulting in a leakage problem.

[0059] Optionally, as Figures 3 - 6 shown, the perimeter of the weld 7 in this application is D, the penetration depth is a, and the press - fitting area between the extended section 201 and the top cover sheet 4 is S. When the compression amount of the extended section 201 is 10% ≤ <25%, the welding penetration depth a formed by the connecting part 102 and the welding block 6 satisfies: 0 < S·16( )≤(0.6 - 0.8) ·D·a; when the compression amount of the extended section 201 is 25% ≤ ≤ 50%, the welding penetration depth a formed by the connecting part 102 and the welding block 6 satisfies: 0 < S·(260 -120( )+18) ≤ (0.6 - 0.8) ·D·a; where is the tensile strength of the material of the terminal 1, with the unit Mpa.

[0060] Since in this application, the connecting part 102 and the riveting fastener are connected by welding, and after the overall structure is assembled, the sealing member 2 is in a compressed state to ensure the sealing effect. Therefore, the extended section 201 of the sealing member 2 always has a resilience force, and this resilience force is mainly borne by the position of the weld 7 to prevent the structure from coming apart. Also, the size of the connecting part 102 does not change and the perimeter of the weld 7 is fixed. Therefore, only by keeping the penetration depth of the weld 7 within a certain range can the problem of the weld 7 cracking and opening, resulting in the failure of the overall cover structure, be avoided.

[0061] Therefore, in this application, according to the compression amount of the extended section 201, making the penetration depth a satisfy the above formula, the welding depth can be selected according to the specific compression amount, so as to ensure the stress stability of the overall structure to a certain extent.

[0062] It can be understood that since the thickness b of the extended section 201 before compression is known, the thickness c of the extended section 201 after compression is known, the area S of the compression of the extended section 201 on the top cover sheet 4 is known, and the tensile strength of the material of the terminal post 1 is known. Therefore, the only unknown in the above formula is the penetration depth a of the weld 7. Thus, the range of the penetration depth can be quickly obtained through this formula, which can greatly save the design and manufacturing processes, improve the manufacturing efficiency, and ensure the connection and structural strength.

[0063] When 10% ≤ <25%, take 17.6% in the above embodiments, the material of the terminal post is the first series of aluminum, and the tensile strength is 95 Mpa. There is:

[0064] According to Embodiments 1 - 3, S·16 ( ) are all within the range, so as to maintain the relative balance of the tensile force and the resilience force.

[0065] Based on Comparative Examples 1 - 3, S·16 ( ) all exceed the upper limit of the range, that is, the resilience force is greater than the tensile force. Therefore, the problem of the terminal post 1 breaking occurs.

[0066] When 25 ≤ ( ) ≤ 50%, take 38.5% in the above embodiments, the material of the terminal post is the first series of aluminum, and the tensile strength is 95 Mpa. There is:

[0067] According to Embodiments 1 - 3, S·(260 -120 ( )+18) are all within the range, that is, the resilience of the sealing component is less than the tensile force of the pole 1. Therefore, the tensile force and the resilience can be kept relatively stable to avoid the breakage of the pole.

[0068] However, based on Comparative Examples 1-3, S·(260 -120 ( )+18) both exceed the upper limit of the range, that is, the rebound force is greater than the tensile strength of the pole, thus causing the pole to break.

[0069] It should be noted here that, since the push-pull test of the pole 1 needs to meet a force of 800N, the penetration depth of the weld 7 performed according to the formula provided in this application not only needs to meet the rebound force of the extension section 201, but also needs to meet a force greater than 800N, so as to ensure assembly and testing requirements.

[0070] It needs to be further explained here that since the greater the compression of the extension section 201, the greater the rebound force, the greater the force that the penetration position of the weld 7 needs to bear, therefore, the compression of the extension section 201 in the present application is proportional to the depth of penetration, that is, the greater the compression, the deeper the penetration depth needs to be to ensure the limitation and sealing of the overall structure.

[0071] Alternatively, if Figure 1 As shown, the intermediate component in the present application also includes a second plastic part 5, and a positioning hole 501 is formed on the second plastic part 5 at the position corresponding to the through hole 401, and the center of the positioning hole 501 is coaxially arranged with the center of the through hole 401; the second plastic part 5 is arranged on the side of the top cover sheet 4 away from the first plastic part 3, and is in contact with the top cover sheet 4; the second plastic part 5 is formed on the side away from the top cover sheet 4 with a receiving groove 502, and the welding block 6 is arranged in the receiving groove 502.

[0072] By providing the second plastic part 5, the top cover sheet 4 can be pressed tightly onto the first plastic part 3, and the accommodating groove 502 formed on the side of the second plastic part 5 away from the top cover sheet 4 can provide an installation foundation and a limiting space for the welding block 6. When the welding block 6 is partially embedded in the accommodating groove 502, the welding block 6 can be used to ensure that the positioning hole through which the connecting portion 102 passes is accurately located on the same axis as the alignment hole 501 of the second plastic part 5, the through hole 401 of the top cover sheet 4, the positioning groove 302 of the first plastic part 3, and the through hole 301 connected to the positioning groove 302, thereby making the overall structure more accurate during assembly.

[0073] In addition, the present invention also provides a battery, comprising the above-mentioned cover plate structure.

[0074] The battery using the cover structure provided in the present application can have a better current-carrying capacity, thereby being able to improve the battery's supply of higher-power equipment needs to a certain extent.

[0075] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A cover plate structure, characterized in that: It comprises a pole (1), an intermediate component and a welding block (6); The pole (1) and the welding block (6) are arranged oppositely on two sides of the intermediate component, the pole (1) comprises a base portion (101) and a connecting portion (102), one end of the connecting portion (102) is connected to the base portion (101), and the other end passes through the intermediate component and is welded to the welding block (6); The dimension of the connecting portion (102) in the length direction of the base portion (101) is B, and the dimension of the connecting portion (102) in the width direction of the base portion (101) is A, satisfying B>A.

2. The cover plate structure according to claim 1, characterized in that: The welding block (6) is formed with a welding hole, and the welding hole is matched with the connecting portion (102) to form a welding seam (7) in the circumferential direction of the connecting portion (102).

3. The cover plate structure according to claim 2, characterized in that: The welding block (6) is formed with a recessed portion (601), the depth of the recessed portion (601) is e, and the distance between the side wall of the recessed portion (601) and the welding seam (7) is d, satisfying 0.2mm≤e≤0.5mm, 0.5mm≤d≤1.5mm.

4. The cover plate structure according to claim 2, characterized in that: The invention also comprises a sealing component (2), wherein the sealing component (2) comprises an extension section (201) and a covering section (202), wherein the covering section (202) is sleeved on the connecting portion (102), and the extension section (201) is in contact with the base portion (101). The sealing component (2) is located between the pole (1) and the intermediate component, and is used to separate and seal the pole (1) and the intermediate component.

5. The cover plate structure according to claim 4, characterized in that: The intermediate component comprises a first plastic part (3), the first plastic part (3) being formed with a through hole (301) and a positioning groove (302), the base part (101) being embedded in the positioning groove (302), and the positioning groove (302) being connected to the through hole (301), so that the connecting part (102) can pass through the through hole (301).

6. The cover plate structure according to claim 5, characterized in that: The intermediate component further comprises a top cover sheet (4), the top cover sheet (4) being arranged on a side of the first plastic part (3) facing away from the pole (1), the top cover sheet (4) being formed with a through hole (401) at a position corresponding to the through hole (301), the connecting portion (102) and the covering section (202) sleeved outside the connecting portion (102) both passing through the through hole (401), and the edge of the top cover sheet (4) corresponding to the through hole (401) being crimped onto the extension section (201).

7. The cover plate structure according to claim 6, characterized in that: The thickness of the expansion section (201) in a non-compressed state is b, and the thickness in a compressed state is c. The compression amount of the expansion section (201) is Satisfied: 10% ≤ ≤50%.

8. The cover plate structure according to claim 7, characterized in that: The circumference of the weld (7) is D, the penetration is a, the pressing area of ​​the expansion section (201) and the top cover sheet (4) is S, and when the compression amount of the expansion section (201) is 10%≤ When the value is less than 25%, the welding penetration a formed by the connecting portion (102) and the welding block (6) satisfies: 0<S·16( )≤(0.6~0.8) ·D·a; When the compression amount of the expansion section (201) is 25%≤ ≤50%, the welding penetration a formed by the connecting portion (102) and the welding block (6) satisfies: 0<S·(260 -120( )+18)≤(0.6~0.8) ·D·a; in is the tensile strength of the material of the pole (1), in MPa.

9. The cover plate structure according to claim 6, characterized in that: The intermediate component further comprises a second plastic part (5), wherein the second plastic part (5) is formed with an alignment hole (501) at a position corresponding to the through hole (401), and the center of the alignment hole (501) is coaxially arranged with the center of the through hole (401); The second plastic part (5) is arranged on a side of the top cover sheet (4) away from the first plastic part (3), and is in contact with the top cover sheet (4); A receiving groove (502) is formed on a side of the second plastic part (5) facing away from the top cover sheet (4), and the welding block (6) is arranged in the receiving groove (502).

10. A battery, characterized in that: The cover plate structure comprises any one of claims 1 to 9.

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