Cover plate structure, battery and electric device

Abstract

The utility model discloses a cover plate structure, a battery and a power utilization device, the cover plate structure comprises a substrate, a pole, a sealing element and a pole base, and the pole at least comprises a first boss, a second boss and a third boss which are arranged in sequence; the periphery of the second boss is sleeved with the sealing piece, at least part of the sealing piece abuts against the side, facing the first boss, of the third boss, and at least the other part of the sealing piece abuts against the side, close to the first boss in the thickness direction, of the substrate; and the pole base is sleeved on the periphery of the first boss and is propped against one side of the sealing element, which is axially deviated from the substrate. Therefore, the first compression area and the second compression area are formed in the cover plate structure by optimizing the polar column structure, the sealing piece and other components, and the two compression areas can play a role in two sealing under the condition that a welding seam does not participate in sealing, so that the sealing reliability and stability of the cover plate structure are improved; therefore, the problem of poor sealing caused by welding seams, welding heat production and the like is solved, and the cost is saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a cover plate structure, a battery and a power utilization device. BACKGROUND

[0002] With the rapid development of the new energy industry, power batteries are increasingly widely used in electric vehicles, energy storage systems and other fields, and the demand for battery cells has also increased significantly. At the same time, the market requirements for battery cells are constantly improving, especially in terms of safety, generalization, lightweight and low-cost design. The intensifying competition of power battery cells prompts manufacturers to continuously optimize the cell structure to meet higher performance standards. In recent years, the progress of welding technology has enabled the current cell manufacturing to have the ability to directly laser weld the tab after ultrasonic welding, which can eliminate the use of adapter plates and significantly optimize the weight reduction and internal resistance reduction of the battery cell. In addition, the production process of the battery cell cover plate has also been improved in recent years, and the cover plate terminal can be directly fixed by welding, simplifying the assembly process.

[0003] In the application of laser welding cover plate, the sealing problem involved by the welding process needs to be considered. In the related art, the laser welded cover plate usually directly uses the welding seam to participate in sealing. However, this requires a very high welding seam, and the scrap rate is also high, which affects the cost. At the same time, the welding seam participates in sealing, and the industry currently only detects through simple helium detection. The welding seam cannot be detected, and the air tightness of the cover plate after mass production and assembly cannot be guaranteed. Under the requirement of one billion level of the battery industry, it is difficult to guarantee. These problems limit the reliability and economy of the existing battery cell cover plate in large-scale production and application. UTILITY MODEL CONTENT

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present application is to provide a cover plate structure which can form a first compression zone and a second compression zone in the cover plate structure by optimizing the pole structure and the sealing member and other components. In the case where the welding seam does not participate in sealing, the two compression zones can jointly play the role of two seals to improve the sealing reliability and stability of the cover plate structure, thereby solving the sealing problem caused by the welding seam and welding heat production, and saving costs.

[0005] The present application also provides a battery with the above-mentioned cover plate structure.

[0006] The present application also provides a power utilization device with the above-mentioned battery.

[0007] According to a cover plate structure of a first aspect of this application, the cover plate structure includes: a substrate, an electrode post, a sealing element, and an electrode post base. The substrate has a mounting hole. The electrode post is disposed in the mounting hole and includes a plurality of bosses arranged sequentially along the axial direction and protruding away from the axis of the electrode post, including at least a first boss, a second boss, and a third boss arranged sequentially, the cross-sectional areas of the first boss, the second boss, and the third boss increasing sequentially. The sealing element is sleeved on the outer periphery of the second boss, and at least a portion of the sealing element abuts against the side of the third boss facing the first boss, and at least another portion abuts against the side of the substrate in the thickness direction close to the first boss. The electrode post base is sleeved on the outer periphery of the first boss and abuts against the sealing element on the side axially away from the substrate.

[0008] According to the cover plate structure of this application, by optimizing the layout of components such as the pole structure and seals, a first compression zone and a second compression zone can be formed in the cover plate structure to form a good seal for the first component mating area located radially inner to the seal and the second component mating area located radially outer to the seal, respectively. In this way, the first compression zone and the second compression zone can jointly provide two sealing functions. Compared with related technologies, where welds are involved in the sealing, there is a high scrap rate, which affects costs and cannot guarantee the airtightness of the cover plate after mass production and assembly. In this application, the weld between the pole and the pole base does not participate in the sealing. Two seals can be formed by a sealing ring to ensure the integrity of the seal at the pole installation point. This can effectively improve the reliability and stability of the cover plate structure seal and is beneficial to the economy of mass production of the cover plate structure. In addition, some related technologies use additional sealing rings to protect against poor sealing caused by laser welding, in addition to the existing sealing rings, to solve the problem of poor sealing caused by welding heat. However, this increases costs and poses a risk of missing sealing rings. In contrast, this application uses only one sealing element for each pole post, which can achieve a good seal. Therefore, it can effectively save costs and improve sealing reliability.

[0009] According to some embodiments of this application, the cover plate structure further includes: a first plastic component and a second plastic component, wherein the first plastic component is disposed between the substrate and the pole post, and abuts against the side of the sealing member away from the pole post base; the second plastic component is disposed on the side of the substrate in the thickness direction close to the first protrusion, and is at least partially connected between the substrate and the pole post base, and abuts against the outer peripheral surface of the sealing member.

[0010] In some embodiments, the pole post further has a fourth protrusion disposed on the side of the third protrusion away from the second protrusion in the axial direction, and the cross-sectional area of ​​the fourth protrusion is larger than the cross-sectional area of ​​the third protrusion. The fourth protrusion abuts against the first plastic part on the side of the fourth protrusion close to the third protrusion in the axial direction and at least a portion of the outer peripheral surface of the fourth protrusion.

[0011] According to some embodiments of this application, the axial dimension of the second boss is d1, the thickness of the seal is d2, and the following conditions are met: d1≤d2, 0.3≤d1≤2mm, 0.3≤d2≤3.5mm.

[0012] According to some embodiments of this application, the radial dimension of the third boss on the side facing the first boss is configured as b1, and satisfies: 0.3≤b1≤2mm.

[0013] According to some embodiments of this application, the pole base has a first surface on one side in the thickness direction, the first surface being adapted to be welded to the second boss on the side axially facing the first boss.

[0014] According to some embodiments of this application, the radial dimension of the second boss on the side axially facing the first boss is configured as b2, and satisfies: 0.8≤b2≤2mm.

[0015] In some embodiments, the pole post has a polygonal profile at one end axially away from the pole post base, the first plastic part has a first polygonal cavity adapted to mate with one end of the pole post, and the mounting hole has a second polygonal cavity adapted to mate with the first plastic part.

[0016] According to a second aspect embodiment of the present application, the battery includes: a housing, a battery cell, and a cover structure as described in any of the above embodiments. The housing has an open receiving cavity; the battery cell is housed within the receiving cavity and has tabs disposed on it; the cover structure is disposed at an end of the housing and closes the open end of the receiving cavity; wherein the tabs are adapted to connect to the electrode base of the cover structure.

[0017] According to a third aspect of this application, the power supply device includes the battery described in the above embodiments.

[0018] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0020] Figure 1 is a battery schematic diagram according to some embodiments of the present application;

[0021] Figure 2 is an exploded view of a cover structure according to some embodiments of the present application;

[0022] Figure 3 is a sectional view of a cover structure according to some embodiments of the present application;

[0023] Figure 4 is Figure 3 is a partial enlarged view at A in FIG. 6;

[0024] Figure 5 is a sealing member schematic diagram according to some embodiments of the present application;

[0025] Figure 6 is a pole schematic diagram according to some embodiments of the present application;

[0026] Figure 7 is a pole sectional view according to some embodiments of the present application;

[0027] Figure 8 is a pole base schematic diagram according to some embodiments of the present application;

[0028] Figure 9 is a cover structure and external bus piece welding schematic diagram according to some embodiments of the present application.

[0029] Reference signs:

[0030] 1000, battery;

[0031] 200, shell; 300, cell; 301, positive tab; 302, negative tab; 400, external bus piece; 500, penetration weld; 601, positive protection sheet; 602, negative protection sheet; 700, insulation piece;

[0032] 100, cover structure; 100a, first compression area; 100b, second compression area; 100c, third compression area;

[0033] 10, base plate; 11, mounting hole; 11a, second polygonal cavity;

[0034] 20, pole; 20a, positive pole; 20b, negative pole; 21, first boss; 22, second boss; 23, third boss; 24, fourth boss;

[0035] 30, sealing member;

[0036] 40, pole base; 41, first face; 42, base thinning face; 43, base through hole; 40a, positive pole base; 40b, negative pole base;

[0037] 50, first plastic piece; 51, first polygonal cavity;

[0038] 60, second plastic piece;

[0039] 70, explosion-proof valve;

[0040] 80, explosion-proof valve patch. DETAILED DESCRIPTION

[0041] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0042] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the present application are only for the purpose of describing the specific embodiments of the present application, and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover not exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application or the above description of drawings are used to distinguish different objects, and are not intended to describe a particular order or primary and secondary relationship.

[0043] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase at various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments.

[0044] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection", "attach" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] The term "and / or" in the present application is only used to describe the relationship between the associated objects, which means that there can be three relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0046] In the embodiments of the present application, the same reference signs represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device, are only exemplary and should not constitute any limitation on the present application.

[0047] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0048] In the description of the present application, the first feature "above" or "below" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them.

[0049] In the description of the present application, the first feature "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the first feature is higher in horizontal height than the second feature.

[0050] "Multiple" appearing in the present application means two or more (including two).

[0051] In the present application, the battery can include a lithium ion secondary battery, a lithium ion primary battery, a lithium-sulfur battery, a sodium lithium ion battery, a sodium ion battery or a magnesium ion battery, etc., and the embodiments of the present application are not limited thereto. The battery can be in the shape of a cylinder, a flat body, a cuboid or other shapes, etc., and the embodiments of the present application are not limited thereto. The battery is generally divided into three types according to the packaging method: cylindrical battery monomer, square battery monomer and soft package battery monomer, and the embodiments of the present application are not limited thereto.

[0052] The battery disclosed in the embodiments of the present application can be used in, but is not limited to, an electric device such as a vehicle, a ship or an aircraft. The power supply system of the electric device can be composed of the battery disclosed in the present application, so that the application range of the battery is improved, and the reliability and stability of the battery sealing are improved.

[0053] The embodiments of the present application provide an electric device using a battery as a power supply. The electric device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft and the like. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy and an electric aircraft toy, and the spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft.

[0054] The following refers to Figures 1-9 The cover plate structure 100, the battery 1000 and the electric device according to the embodiments of the present application are described.

[0055] As Figures 2-4 shown, the cover plate structure 100 according to the first aspect of the present application includes a substrate 10, a pole 20, a sealing member 30 and a pole base 40.

[0056] The substrate 10 has a mounting hole 11, and the pole 20 is arranged in the mounting hole 11. The pole 20 includes a plurality of bosses arranged in sequence along the axial direction and each protruding away from the axis of the pole 20, wherein at least the first boss 21, the second boss 22 and the third boss 23 are arranged in sequence, and the cross-sectional areas of the first boss 21, the second boss 22 and the third boss 23 increase in sequence. The sealing member 30 is sleeved on the outer periphery of the second boss 22, and at least part of the sealing member 30 abuts against the side of the third boss 23 facing the first boss 21, and at least another part abuts against the side of the substrate 10 close to the first boss 21 in the thickness direction. The pole base 40 is sleeved on the outer periphery of the first boss 21 and abuts against the side of the sealing member 30 away from the substrate 10 in the axial direction.

[0057] Specifically, the substrate 10 is the bearing base of the entire cover plate structure 100, which can be used to support, fix and protect part of other components of the cover plate structure 100 (such as the pole 20, etc.), and mounting holes 11 can be formed on the substrate 10 for mounting and fixing the pole 20. The mounting holes 11 can match the size and shape of the pole 20 to ensure that the pole 20 can be stably mounted on the substrate 10. The pole 20 is used to realize the input and output of current, and the pole 20 includes a positive pole 20a and a negative pole 20b. The mounting holes 11 on the substrate 10 can be configured as two mounting holes spaced apart along the extension direction of the substrate 10 to respectively mount the positive pole 20a and the negative pole 20b. The pole 20 includes a plurality of bosses arranged in sequence in the axial direction (the thickness direction of the substrate 10), and the bosses all protrude in the direction away from the axis of the pole 20, forming a stepped structure. The bosses include at least three parts: a first boss 21, a second boss 22 and a third boss 23. The first boss 21 is located at the lowermost position and serves as a support part and at least part of an electrical connection of the pole 20. The second boss 22 is located above the first boss 21, and the outer periphery of the second boss 22 is sleeved with a sealing element 30. The third boss 23 is located above the second boss 22, and the side of the third boss 23 facing the first boss 21 abuts against part of the sealing element 30. The cross-sectional areas of the first boss 21, the second boss 22 and the third boss 23 increase in sequence, which is conducive to enhancing the structural strength of the pole 20 and providing strong support for subsequent sealing and fixing.

[0058] In the present application, the pole base 40 can be sleeved on the outer periphery of the first boss 21 of the pole 20, and the pole base 40 can serve to fix and connect the pole 20. In the present application, the sealing element 30 is sleeved on the outer periphery of the second boss 22, and the side of the sealing element 30 axially away from the substrate 10 can abut against the top end of the pole base 40. It can be understood that the bottom end of the sealing element 30 abuts against the top end of the pole base 40. At least part of the sealing element 30 abuts against the side of the third boss 23 facing the first boss 21, so that under the action of its own gravity, the third boss 23 exerts pressure on at least part of the top end of the sealing element 30 and forms a first compression area 100a. The existence of the first compression area 100a enables the sealing element 30 to form a good seal with a first component mating area located on the side (i.e., the radially inner side) of the sealing element 30 radially close to the pole 20. At the same time, at least another part of the sealing element 30 abuts against the side of the substrate 10 in the thickness direction close to the first boss 21. Similarly, under the action of its own gravity, the substrate 10 exerts pressure on at least another part of the top end of the sealing element 30 and forms a second compression area 100b. The existence of the second compression area 100b enables the sealing element 30 to form a good seal with a second component mating area located on the side (i.e., the radially outer side) of the sealing element 30 radially close to the substrate 10.

[0059] According to the cover plate structure 100 of the present application, the first compression area 100a and the second compression area 100b can be formed in the cover plate structure 100 by optimizing the structure of the pole 20 and the arrangement of the sealing member 30 and other components, so as to form a good seal for the first component fitting area located radially inside the sealing member 30 and the second component fitting area located radially outside the sealing member 30, respectively. In this way, the first compression area 100a and the second compression area 100b can jointly play the role of two seals. In the related art, the weld seam participates in the sealing, which has a high scrap rate, affects the cost, and cannot guarantee the air tightness of the cover plate after mass production and assembly. In the present application, the weld seam between the pole 20 and the pole base 40 does not participate in the sealing, and two seals can be formed by one sealing ring to ensure the perfect sealing of the pole 20 installation position, thereby effectively improving the reliability and stability of the cover plate structure 100 sealing, and being beneficial to the economy of mass production of the cover plate structure 100. In addition, in the related art, some means for protecting the poor sealing formed by laser welding are to additionally increase a sealing ring in the case where a sealing ring has been provided, to solve the problem of poor sealing caused by welding heat production, but this increases the cost and there is a risk of missing the sealing ring. In the present application, only one sealing member 30 is provided for a single pole 20, which can achieve good sealing, thereby effectively saving cost and improving sealing reliability.

[0060] As shown in Figures 2-4 some embodiments of the present application, the cover plate structure 100 further comprises a first plastic member 50 and a second plastic member 60.

[0061] The first plastic member 50 is arranged between the substrate 10 and the pole 20, and abuts against the side of the sealing member 30 away from the pole base 40. The second plastic member 60 is arranged on the side of the substrate 10 close to the first boss 21 in the thickness direction, and is at least partially connected between the substrate 10 and the pole base 40, and abuts against the outer circumferential surface of the sealing member 30.

[0062] Specifically, the first plastic part 50 can be arranged between the base plate 10 and the pole column 20, the radially inner side of the first plastic part 50 is adapted to abut against the outer circumferential surface of the pole column 20, the radially outer side of the first plastic part 50 is adapted to abut against at least part of the inner wall of the mounting hole 11 of the base plate 10, and the bottom end of the first plastic part 50 can abut against the sealing part 30 on the side axially away from the pole column base 40. The first plastic part 50 can ensure that the sealing part 30 can remain stable when subjected to pressure, so as to improve the working reliability and service life of the sealing part 30. Meanwhile, the first plastic part 50 can also effectively isolate the base plate 10 and the pole column 20, so as to prevent the penetration of gas or liquid, thereby optimizing the working performance and safety of the pole column 20. The second plastic part 60 is arranged on the side of the base plate 10 close to the first boss 21 in the thickness direction, and at least part of the second plastic part 60 is connected between the base plate 10 and the pole column base 40. It can be understood that at least part of the second plastic part 60 is located in the space on the side where the base plate 10, the sealing part 30 and the pole column base 40 face each other. The second plastic part 60 can improve the stability of the sealing part 30, ensure that a good sealing interface is formed between the outer circumferential surface of the sealing part 30 and the base plate 10 and the pole column base 40, and further enhance the sealing effect. Meanwhile, the second plastic part 60 also connects the base plate 10, the pole column base 40 and the sealing part 30 together to form an integral structure, thereby improving the strength and stability of the entire cover plate structure 100. In addition, the first plastic part 50 and the second plastic part 60 in the embodiment of the application both have good insulation performance, can effectively isolate the electrical contact between the pole column 20 and other conductive components, can prevent short circuit phenomenon from occurring, and can ensure the safe operation of the battery 1000.

[0063] It should be noted that under the action of the gravity of the first plastic part 50 itself, the first plastic part 50 can compress the sealing part 30 and form a third compression area 100c, which is located between the first compression area 100a and the second compression area 100b in the radial direction. The compression of the sealing part 30 by the first plastic part 50 can prevent the penetration of electrolyte, which can cause poor insulation and voltage resistance. In the related art, when the battery cell 300 is injected with electrolyte, the electrolyte often overflows. If the amount of overflow is large, the electrolyte will flow into the gap between the terminals. In the embodiment of the application, the sealing area formed by the third compression area 100c can disconnect the channel between the pole column 20 and the base plate 10, thereby preventing the creeping phenomenon that occurs when the base plate 10 conducts electricity.

[0064] As Figure 4 , Figure 6 and Figure 7As shown, according to some embodiments of this application, the pole post 20 further has a fourth boss 24, which is disposed on the side of the third boss 23 that is axially away from the second boss 22, and the cross-sectional area of ​​the fourth boss 24 is larger than the cross-sectional area of ​​the third boss 23. The side of the fourth boss 24 that is axially close to the third boss 23 and at least a portion of the outer peripheral surface of the fourth boss 24 abut against the first plastic part 50.

[0065] Specifically, the fourth boss 24 is disposed on the side of the third boss 23 that is axially opposite to the second boss 22, which can be understood as the fourth boss 24 being located above the third boss 23. The fourth boss 24 abuts against the first plastic part 50 on the side axially close to the third boss 23 (i.e., the bottom surface of the fourth boss 24) and at least a portion of its outer peripheral surface. This allows the first plastic part 50 to tightly wrap around the pole post 20, thereby further enhancing the sealing effect. Furthermore, the cross-sectional area of ​​the fourth boss 24 is larger than that of the third boss 23, which enhances the structural strength of the pole post 20 and increases the contact area between the first plastic part 50 and the pole post 20, thereby further improving the reliability and stability of the seal.

[0066] It should be noted that when the pole post 20 is installed in the mounting hole 11 of the substrate 10, the bottom surface and outer peripheral surface of the fourth boss 24 are in close contact with the first plastic part 50. At the same time, the outer peripheral surface of the third boss 23 of the pole post 20 is also in contact with the first plastic part 50. The bottom end of the first plastic part 50 is in contact with the sealing member 30 on the side axially away from the pole post base 40. Thus, the sealing member 30 can seal the connection area between the first plastic part 50 and the pole post 20. When the electrode post 20 and the electrode post base 40 are laser welded, welding pores and microcracks may cause the electrode post base 40 to be penetrated, resulting in poor airtightness in the first component mating area (i.e., the area composed of the electrode post 20, the seal 30, and the electrode post base 40) located radially inside the seal 30. At this time, the first compression zone 100a can play a sealing function. Under the action of the first compression zone 100a, the poor airtightness in the first component mating area can be prevented from forming an internal and external communication channel through the connection area between the electrode post 20 and the first plastic part 50, thereby ensuring that the seal of the electrode post 20 is not affected by the weld.

[0067] like Figure 4 , Figure 6 as well as Figure 7 As shown, according to some embodiments of this application, the axial dimension of the second boss 22 is d1, and the thickness of the seal 30 is d2, and satisfies: d1≤d2, 0.3≤d1≤2mm, 0.3≤d2≤3.5mm.

[0068] Specifically, the sealing member 30 is sleeved on the outer periphery of the second boss 22, and the thickness d2 of the sealing member 30 is greater than or equal to the axial dimension d1 of the second boss 22, so that the sealing member 30 has sufficient thickness to ensure that the area between the second boss 22 and the pole base 40 can be fully filled, thereby ensuring good sealing and air tightness.

[0069] When d1 and d2 are less than 0.3 mm, for example, d1 and d2 are each configured to be 0.2 mm or 0.1 mm, etc., the axial dimension of the second boss 22 and the thickness of the sealing member 30 are too small, which can cause high precision and be difficult to manufacture, the sealing member 30 is too small in thickness to fully fill the small gap between the second boss 22 and the adjacent other components, resulting in poor sealing effect, and the sealing member 30 is prone to falling off the second boss 22, causing assembly difficulties, etc.; when d1 is greater than 2 mm and d2 is greater than 3.5 mm, for example, d1 is configured to be 2.5 mm or 3 mm, etc., and d2 is configured to be 4 mm or 4.5 mm, etc., the axial dimension of the second boss 22 and the thickness of the sealing member 30 are too large, which, on the one hand, can result in the need for more installation space to accommodate the second boss 22 and the sealing member 30, and in a compact design environment, can cause installation difficulties or be unable to install, and on the other hand, the large d1 and d2 mean that more material is needed to manufacture the second boss 22 and the sealing member 30, which can result in material waste and an increase in manufacturing cost.

[0070] In the embodiments of the present application, the axial dimension d1 of the second boss 22 is configured to be in the range of 0.3 mm to 2 mm, and the thickness d2 of the sealing member 30 is configured to be in the range of 0.3 mm to 3.5 mm, for example, d1 is configured to be 0.3 mm, 1 mm or 2 mm, etc., and d1 is configured to be 0.3 mm, 2 mm or 2.5 mm, etc., so that the axial dimension of the second boss 22 and the thickness of the sealing member 30 are appropriate, which facilitates the production and manufacture of the sealing member 30 and the second boss 22, and is conducive to improving the assembly stability of the sealing member 30 sleeved on the second boss 22, helping to improve production efficiency and enhance the sealing reliability of the sealing member 30, and also conducive to controlling the material cost.

[0071] In addition, in some specific embodiments of the present application, the sealing member 30 is configured as a flat gasket structure. The flat gasket structure is relatively simple to manufacture and can be easily manufactured by stamping, cutting or molding, etc., which helps to save production cost and improve production efficiency.

[0072] In some other specific embodiments of the present application, the inner diameter of the sealing member 30 is configured to be in the range of 2 mm to 30 mm, and the outer diameter is configured to be in the range of 3 mm to 35 mm, to improve the versatility of the sealing member 30 applied to the pole 20 in different cover plate structures 100.

[0073] As Figure 4 ,Figure 6 as well as Figure 7 As shown, according to some embodiments of this application, the radial dimension of the third boss 23 facing the first boss 21 is configured as b1, and satisfies: 0.3≤b1≤2mm.

[0074] Specifically, the radial dimension of the third boss 23 facing the first boss 21 can be understood as the radial overlap dimension between the third boss 23 and the seal 30. When b1 is less than 0.3mm, for example, b1 is constructed as 0.2mm or 0.1mm, the radial dimension of the third boss 23 facing the first boss 21 is too small, and the overlap area between the third boss 23 and the seal 30 is too small. This will result in insufficient pressure applied by the third boss 23 to the seal 30, thus preventing the seal 30 from forming an effective first compression zone 100a. This will reduce the sealing effect of the seal 30 on the mating area of ​​the first component and may even lead to complete seal failure. When b1 is greater than 2mm, for example, b1 is constructed as 2.5mm or 3mm, the radial dimension of the third boss 23 facing the first boss 21 is too large. This will easily reduce the structural strength and rigidity of the third boss 23 itself, resulting in poor impact resistance and deformation resistance, thus affecting... In addition to affecting the service life, an excessively large b1 also increases material costs. In this embodiment, by setting the radial dimension b1 of the side of the third boss 23 facing the first boss 21 in the range of 0.3 to 2 mm, for example, b1 is constructed as 0.3 mm, 1 mm or 2 mm, the radial dimension of the side of the third boss 23 facing the first boss 21 is appropriate. This ensures that the third boss 23 and the seal 30 have sufficient overlap area, ensuring that the third boss 23 applies sufficient pressure to the seal 30, thereby ensuring the sealing effect of the first compression zone 100a of the seal 30. At the same time, it also ensures that the third boss 23 itself has sufficient strength and rigidity to withstand external pressure or impact, which helps to improve the overall strength and durability of the cover plate structure 100.

[0075] like Figure 4 and Figure 8 As shown, according to some embodiments of this application, the pole base 40 has a first surface 41 on one side in the thickness direction, and the first surface 41 is adapted to be welded to the second boss 22 on the side axially facing the first boss 21.

[0076] Specifically, the first surface 41 of the pole base 40 can be welded to the second boss 22 on the side axially facing the first boss 21, for example, by laser welding, so that a firm connection can be formed between the pole base 40 and the second boss 22, thereby ensuring the current transmission between the pole base 40 and the pole 20 and ensuring the overall stability and reliability of the cover structure 100. In the cooperation between the pole base 40 and the second boss 22, the protruding structure of the second boss 22 itself can also form a positioning with the pole base 40, playing a good positioning role.

[0077] It should be noted that in the related art, the plastic part often participates in sealing, and welding generates heat, and the plastic part is easily deformed by heat, thereby causing poor sealing or failure. In the embodiments of the present application, the second compression area 100b can ensure good sealing of the second component cooperation area composed of the second plastic part 60, the substrate 10, the sealing part 30, and the positive pole base 40, and can ensure that the second plastic part 60 is not affected by the welding heat deformation, thereby effectively enhancing the sealing performance of the cover plate structure 100.

[0078] In addition, in some embodiments of the present application, the negative pole 20b and the positive pole 20a are configured to have the same material, and the positive pole base 40a corresponding to the negative pole 20b and the positive pole 20a also has the same material. The cover plate structure 100 can be used as a cover plate of the sodium ion battery 300. In other embodiments, the negative pole 20b and the positive pole 20a are configured to have different materials, the negative pole 20b is a composite plate or a friction welded plate, and the positive pole 20a and the positive pole base 40a have a single metal material. The cover plate structure 100 is used as a cover plate of the lithium ion battery 300. The negative pole 20b and the negative pole base 40b corresponding to the negative pole 20b can change the material according to different chemical systems, that is, it can be used universally without the need for structural changes and tool switching.

[0079] As shown in Figure 4 , Figure 6 and Figure 7 , according to some embodiments of the present application, the radial dimension of the second boss 22 on the side facing the first boss 21 in the axial direction is configured as b2, and satisfies: 0.8≤b2≤2mm.

[0080] Specifically, the second boss 22 is connected to the top end of the pole base 40 on the side axially facing the first boss 21, and the contact surface between the second boss 22 and the pole base 40 is used to realize current transmission. According to the physical properties of the current, the greater the contact area, the smaller the impedance when the current passes through, and thus the greater the overcurrent capacity. Therefore, by precisely controlling the size of b2 to be within the range of 0.8mm to 2mm, for example, b2 is configured to be 0.8mm, 1mm or 2mm, etc., it can be ensured that the contact area between the second boss 22 and the pole base 40 is large enough to enhance the overcurrent capacity and heat dissipation capacity between the pole base 40 and the pole 20. In addition, by precisely controlling the size of b2 to be within the range of 0.8mm to 2mm, the second boss 22 and the pole base 40 have sufficient contact area, which can also ensure the welding area between the pole base 40 and the second boss 22, and can provide stronger welding strength, thereby enhancing the fixing strength of the pole 20. At the same time, the stable welding area also helps to ensure the stability of the compression amount of the sealing element 30, so that the sealing effect of the sealing element 30 can be maintained.

[0081] As shown in Figure 2 and Figure 6 According to some embodiments of the present application, the pole 20 is configured as a polygon in profile shape at the end axially away from the pole base 40, the first plastic part 50 has a first polygonal cavity 51 adapted to cooperate with the end of the pole 20, and the mounting hole 11 has a second polygonal cavity 11a adapted to cooperate with the first plastic part 50.

[0082] Specifically, the pole 20 is configured as a polygon in profile shape, such as a triangle, a rectangle or a hexagon, etc., at the end axially away from the pole base 40, and the first plastic part 50 has a first polygonal cavity 51 matched with the end of the pole 20 to ensure close cooperation between them. In addition, the mounting hole 11 also has a second polygonal cavity 11a matched with the first plastic part 50, so as to realize the mounting cooperation between the pole 20, the first plastic part 50 and the substrate 10. By configuring the pole 20 as a polygon in profile shape at the end axially away from the pole base 40, and cooperating the first polygonal cavity 51 and the second polygonal cavity 11a with the polygonal pole 20, a stable and not easy to loosen connection can be formed between the pole 20, the first plastic part 50 and the substrate 10, which can improve the torsional resistance and impact resistance of the pole 20.

[0083] In some embodiments, the pole 20 is configured as a regular hexagon at the end axially away from the pole base 40, and the first polygonal cavity 51 and the second polygonal cavity 11a are respectively configured as a regular hexagon in cross-sectional profile, so as to realize the pole 20 having good torsional resistance.

[0084] In addition, in some specific embodiments of the present application, as shown in Figure 9As shown, the fourth boss 24 of the pole 20 is adapted to be welded with an external busbar 400 (such as an aluminum bar or the like) at one end axially away from the third boss 23 to be electrically connected with the outside. The fourth boss 24 can be welded within 1mm from the top end of the end face, and the penetration welding is used, which has a penetration weld 500.

[0085] In some other embodiments of the present application, as shown in Figure 2 As shown, the cover plate structure 100 further comprises an explosion-proof valve 70 and an explosion-proof valve patch 80. The explosion-proof valve 70 is arranged on the base plate 10, and when the internal pressure of the battery 1000 reaches a preset pressure value, the explosion-proof valve 70 can be automatically opened to release the internal pressure, thereby protecting the safety of the battery 1000 and the user; the explosion-proof valve patch 80 is arranged at the opening of the explosion-proof valve 70, which is used to ensure that the explosion-proof valve 70 is in a closed state under normal circumstances to prevent external pollutants from entering the inside of the battery 1000. At the same time, when the internal pressure of the battery 1000 rises, the explosion-proof valve patch 80 can quickly break or fall off, so that the explosion-proof valve 70 can be smoothly opened and the pressure can be released.

[0086] As shown in Figure 1 As shown, the battery 1000 according to the second aspect of the present application comprises a shell 200, a battery cell 300, and the cover plate structure 100 according to any one of the above embodiments.

[0087] The shell 200 has an open accommodating cavity; the battery cell 300 is accommodated in the accommodating cavity and is provided with a tab; the cover plate structure 100 is arranged at the end of the shell 200 and closes the open end of the accommodating cavity; and the tab is adapted to be connected with the pole base 40 of the cover plate structure 100.

[0088] Specifically, the shell 200 forms an open accommodating cavity therein for accommodating the battery cell 300, and the shape and size of the accommodating cavity can match the battery cell 300 to ensure that the battery cell 300 can be stably installed in the shell 200; the battery cell 300 is used for storing electric energy and is provided with a tab made of a conductive material, which is adapted to be connected with the pole base 40 of the cover plate structure 100, so that the battery cell 300 can be electrically connected with an external circuit through the pole base 40 and the pole 20 to ensure the normal charging and discharging work of the battery cell 300; the cover plate structure 100 is arranged at the end of the shell 200 and closes the open end of the accommodating cavity. Since the cover plate structure 100 is configured as the cover plate structure 100 according to any one of the above embodiments, the cover plate structure 100 in the battery 1000 according to the embodiments of the present application can prevent poor air tightness caused by welding seam quality problems of the welding area, can reduce the high standard requirement for welding seam defects, and has good sealing performance, which can effectively enhance the overall air tightness of the battery 1000 and improve the working performance and safety of the battery 1000.

[0089] It should be noted that the cover plate structure 100 of the present application can realize the platformization and generalization among different battery cells 300. In some embodiments, the cover plate structure 100 can be mainly applied to battery cells 300 with a thickness of 30 mm or more, and the capacity and thickness of the battery cell 300 are screened. The diameter of the pole 20 of the cover plate structure 100 can be developed in multiple gradients, and the terminals in the gradient are universalized. The universalized components are mainly the first plastic part 50, the pole 20, and the sealing part 30. In the new cover plate structure 100 in the gradient, only the second plastic part 60, the substrate 10, and the pole base 40 metal stamping sheet need to be developed. In this way, the investment cost of the mold of the parts and the production tool of the substrate 10 can be greatly reduced, and the development cycle of the substrate 10 can also be shortened.

[0090] In addition, in some specific embodiments of the present application, as shown in Figure 8 The pole base 40 has a base welding surface, i.e., a first surface 41, on one side of the thickness direction, which is spaced apart in the width direction of the pole base 40. The pole base 40 also has a base thinning surface 42 between the two base welding surfaces and a base through hole 43 arranged on the base thinning surface 42. The base welding surface is suitable for laser welding with the pole tab to electrically connect the battery cell 300 and the pole 20. The direct laser welding of the base welding surface and the pole tab can reduce the resistance value of the connection between the pole tab and the cover plate structure 100. The base through hole 43 can be provided for the first boss 21 of the pole 20 to pass through, so that the pole 20 is lapped with the base thinning surface 42. The overall thickness of the part where the base thinning surface 42 is located can be smaller than the part where the base welding surface is located. In some embodiments, the thickness of the part where the base welding surface is located is set to be 0.3-0.8 mm, and the thickness of the part where the base welding surface is located is set to be 0.3-2 mm. The lapping of the base thinning surface 42 and the pole 20 is beneficial to reduce the welding power and reduce the thermal influence of the welding heat on the plastic part and the sealing part 30, thereby helping to further enhance the sealing effect. In addition, the pole base 40 in the embodiments of the present application can be a simple stamping part, and the mold is relatively simple to make, which is beneficial to efficient and low-cost mass production. In the cover plate structure 100, the pole base 40 is used as a non-universal part, which can be designed to meet the needs of different battery cells 300 to improve the adaptability of the pole base 40 to the battery cells 300.

[0091] In some embodiments of the present application, the tab includes a positive tab 301 and a negative tab 302 arranged at intervals, and the battery 1000 further includes a positive protective sheet 601 and a negative protective sheet 602, the positive protective sheet 601 is arranged between the positive tab 301 and the positive pole post base 40a, and the negative protective sheet 602 is arranged between the negative tab 302 and the negative pole post base 40b. The positive protective sheet 601 and the negative protective sheet 602 can be ultrasonically welded with the positive tab 301 and the negative tab 302 respectively, and after ultrasonic welding, the positive tab 301 and the positive protective sheet 601 are overlapped on the positive pole post base 40a and fixed by laser, and after ultrasonic welding, the negative tab 302 and the negative protective sheet 602 are overlapped on the negative pole post base 40b and fixed by laser. Thus, the use of the adapter sheet is cancelled by optimizing the welding process, and the direct welding process of the battery cell 300 can reduce the internal resistance of the battery cell 300 and improve the electrical performance of the battery cell 300.

[0092] In some other embodiments of the present application, an insulating member 700 is arranged between the outer periphery of the battery cell 300 and the shell 200, and the insulating member 700 can be configured as a Mylar film to protect the electrode material and provide good insulation.

[0093] As shown in FIG. 8, the battery cell 300 according to the third aspect of the present application includes the battery 1000 described in the above embodiments, and the generated technical effects are the same as those in the above embodiments, which will not be described herein. Figures 1-9 As shown in FIG. 8, the battery cell 300 according to the third aspect of the present application includes the battery 1000 described in the above embodiments, and the generated technical effects are the same as those in the above embodiments, which will not be described herein.

[0094] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0095] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A cover plate structure, characterized in that, include: A substrate (10) having mounting holes (11); The pole post (20) is disposed in the mounting hole (11). The pole post (20) includes a plurality of bosses arranged sequentially along the axial direction and protruding away from the axis of the pole post (20). Among them, at least a first boss (21), a second boss (22) and a third boss (23) are arranged sequentially. The cross-sectional area of ​​the first boss (21), the second boss (22) and the third boss (23) increases sequentially. A sealing element (30) is sleeved on the outer periphery of the second boss (22), and at least a portion of the sealing element (30) abuts against the side of the third boss (23) facing the first boss (21), and at least another portion abuts against the side of the substrate (10) in the thickness direction close to the first boss (21). The pole base (40) is sleeved on the outer periphery of the first boss (21) and abuts against the sealing member (30) on the side axially away from the substrate (10).

2. The cover plate structure according to claim 1, characterized in that, Also includes: The first plastic part (50) is disposed between the substrate (10) and the pole post (20) and abuts against the side of the sealing member (30) away from the pole post base (40). The second plastic component (60) is disposed on the side of the substrate (10) in the thickness direction close to the first boss (21), and is at least partially connected between the substrate (10) and the pole base (40), and abuts against the outer peripheral surface of the seal (30).

3. The cover plate structure according to claim 2, characterized in that, The pole post (20) also has a fourth protrusion (24), which is disposed on the side of the third protrusion (23) away from the second protrusion (22) in the axial direction, and the cross-sectional area of ​​the fourth protrusion (24) is larger than the cross-sectional area of ​​the third protrusion (23). The fourth protrusion (24) abuts against the first plastic part (50) on the side of the fourth protrusion (24) close to the third protrusion (23) in the axial direction and at least part of the outer peripheral surface of the fourth protrusion (24).

4. The cover plate structure according to claim 1, characterized in that, The second boss (22) has an axial dimension of d1 and the seal (30) has a thickness of d2, and satisfies: d1≤d2, 0.3≤d1≤2mm, 0.3≤d2≤3.5mm.

5. The cover plate structure according to claim 1, characterized in that, The radial dimension of the third boss (23) facing the first boss (21) is b1, and satisfies: 0.3≤b1≤2mm.

6. The cover plate structure according to claim 1, characterized in that, The pole base (40) has a first surface (41) on one side in the thickness direction, and the first surface (41) is adapted to be welded to the second boss (22) on the side axially facing the first boss (21).

7. The cover plate structure according to claim 1, characterized in that, The second boss (22) has a radial dimension of b2 on the side axially facing the first boss (21), and satisfies: 0.8≤b2≤2mm.

8. The cover plate structure according to claim 2, characterized in that, The pole post (20) has a polygonal outline at the end axially away from the pole post base (40), the first plastic part (50) has a first polygonal cavity (51) adapted to mate with one end of the pole post (20), and the mounting hole (11) has a second polygonal cavity (11a) adapted to mate with the first plastic part (50).

9. A battery, characterized in that, include: A housing (200) having an open receiving cavity; A battery cell (300) is housed within the accommodating cavity, and the battery cell (300) is provided with tabs; The cover plate structure according to any one of claims 1-8, wherein the cover plate structure is disposed at the end of the housing (200) and closes the open end of the accommodating cavity; wherein the electrode lug is adapted to be connected to the electrode base (40) of the cover plate structure.

10. An electrical appliance, characterized in that, include: The battery as described in claim 9.

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