Power battery top cover and power battery comprising same

Abstract

The utility model provides the power battery top cover and the power battery comprising the power battery top cover, the power battery top cover is stable in structure, and the space of the battery top cover can be effectively reduced. The power battery top cover comprises a cover plate which is provided with a mounting through hole; the polar column is provided with a pressing and abutting part abutting against the first side of the cover plate, a column body part penetrating through the mounting through hole and a pressing part penetrating out of the second side of the cover plate; the pressing piece is used for fixedly connecting the pressing part with the cover plate; the first insulating part is arranged between the pressing part and the first side of the cover plate in an abutting manner; the connecting sheet is arranged between the pressing and abutting part and the first insulating part in an abutting manner, and the connecting sheet is fixedly connected with the pressing and abutting part; wherein the cover plate and the first insulating part are respectively provided with a sinking table protruding towards the second side of the cover plate, the sinking table of the first insulating part is embedded in the sinking table of the cover plate, and the pressing and abutting part and the connecting piece are arranged in the sinking table of the first insulating part.

Description

Technical Field

[0001] The utility model relates to a power battery top cover and a power battery comprising the power battery top cover. Background Art

[0002] Power batteries are core components of the new energy industry, consisting of a shell and a battery pack placed in the shell. The top cover of the power battery is the core part of the shell, which generally includes a cover plate and a pole penetrating the cover plate. The pole is connected to the pole ear of the battery pack through a connecting piece to realize the charging and discharging function. With the development of new energy, power batteries have made great progress in both material system links and structural innovation. How to achieve performance improvement and cost reduction through functional integration, structural simplification, and intensive manufacturing has become the focus of power battery development. Today, a new generation of structural innovation products represented by the top battery provides an effective solution to the above problems. For example, the top battery produced by Ruipu Lanjun Energy Co., Ltd. adopts an integrated structure inside the battery cell, reduces the length of the pole ear, and reduces the original battery top cover space from 15mm to 8mm, effectively improving space utilization and volume energy density. Utility Model Content

[0003] In view of this, the utility model provides a new power battery top cover, which has a stable structure and can effectively reduce the battery top cover space.

[0004] The utility model also provides a power battery comprising the power battery top cover.

[0005] Specifically, the following technical solutions are included:

[0006] As a first aspect of the utility model, the utility model provides a power battery top cover, including a cover plate, on which a mounting through hole is provided;

[0007] A pole, comprising a pressing portion abutting against a first side of the cover plate, a column portion axially passing through the mounting through hole, and a pressing portion penetrating from a second side of the cover plate;

[0008] A pressing sheet, used for fixedly connecting the pressing portion and the cover plate;

[0009] A first insulating member is disposed between the pressing portion and the first side of the cover plate;

[0010] A connecting piece, on which a connecting through hole is provided, the pole passes through the connecting through hole, is abutted between the pressing part and the first insulating member, and the connecting piece is fixedly connected to the pressing part;

[0011] in,

[0012] The cover plate and the first insulating member are both provided with a sinking platform protruding toward the second side of the cover plate, the sinking platform of the first insulating member is embedded in the sinking platform of the cover plate, and the pressing portion and the connecting piece are arranged in the sinking platform of the first insulating member.

[0013] The cover plate, the pole, the pressing sheet, and the first insulating member are all well-known and commonly used components in the art. The pressing sheet and the first insulating member are both provided with a hole structure through which the pole can pass, and no further elaboration is required here.

[0014] The sink structure in the cover plate and the first insulating member can be easily obtained by existing technology, such as stamping.

[0015] As is known in the art, the power battery top cover further includes a sealing ring, which is sleeved on the outer peripheral side of the column portion, compressed in the axial direction and pressed radially against the cover plate to seal the mounting through hole; the power battery top cover may further include a second insulating member, which is abutted between the second side of the cover plate and the pressing sheet.

[0016] Preferably, the connecting piece and the pressing portion are fixedly connected by ultrasonic welding.

[0017] Preferably, the pressing sheet and the pressing portion are connected by riveting.

[0018] Preferably,

[0019] The end surface of the first insulating member away from the cover plate and the end surface of the pressing portion are substantially on the same plane perpendicular to the axial direction of the pole;

[0020] The end surface of the cover plate sink located on the second side of the cover plate does not exceed the end surface of the pressing portion, or is substantially on the same plane as the end surface of the pressing portion and is perpendicular to the axial direction of the pole.

[0021] As a second aspect of the present invention, the present invention provides a power battery comprising the power battery top cover.

[0022] The manufacturing method of the power battery top cover may include the following steps:

[0023] The first step is to pass the pole through the connecting through hole on the connecting piece so that the connecting piece is fixedly connected to the pressing part;

[0024] Step 2: Pass the pole through the first insulating member, the cover plate and the pressing piece in sequence, so that the pressing portion and the connecting piece are located in the sinking platform of the first insulating member, and the sinking platform of the first insulating member is embedded in the sinking platform of the cover plate;

[0025] The third step is to fix the pressing part and the cover plate together.

[0026] The power battery top cover also includes a commonly used sealing ring. As a preferred solution, the manufacturing method includes the following steps:

[0027] The first step is to fix the connecting piece and the pressing part together;

[0028] Step 2: Pass the pole through the first insulating member, the sealing ring, the cover plate and the pressing sheet in sequence, so that the pressing portion and the connecting sheet are located in the sinking platform of the first insulating member, and the sinking platform of the first insulating member is embedded in the sinking platform of the cover plate;

[0029] The third step is to first connect the pressing piece and the pole by riveting, forming a pressing part at the end of the pole, and compress the sealing ring in the axial direction, and press it against the cover plate in the radial direction to seal the installation through hole, and then weld the pressing part and the cover plate to fix it. In this way, the pole has a pressing part and a column part (which can be called a pole mother part at this time) before riveting, and forms a pressing part after riveting (which is a complete pole structure in the power battery cover plate). Obviously, the pressing piece and the pressing part can also be connected in other ways, such as directly welding and fixing, and compressing the sealing ring during the welding process.

[0030] Specifically, the power battery top cover may further include a second insulating member. In the second step of the manufacturing method, the pole is passed through the cover plate, then through the second insulating member, and then through the pressing sheet, so that the pressing portion and the connecting sheet are located in the sinking platform of the first insulating member, and the sinking platform of the first insulating member is embedded in the sinking platform of the cover plate.

[0031] Compared with the prior art, the beneficial effects of the technical solution provided by the embodiment of the utility model include at least:

[0032] 1. By setting a sinking structure on the first insulating member and the cover plate, the connecting piece originally between the pole ear and the pole is cleverly set between the pole pressing part and the first insulating member, and the pole pressing part and the connecting piece are placed in the sinking platform, saving the space required for the connecting piece in the prior art; at the same time, the pole passes through the connecting piece, and the pressing part at its end abuts against the connecting piece, and the connecting piece is clamped between the pressing part and the first insulating member, and the pole and the connecting piece are fixedly connected as an integrated structure. Compared with the method of simply welding the connecting piece to the end of the pole face to face in the prior art, the structure formed is more stable and avoids the risk of being pulled and cracked. The pole and the connecting piece can be fixedly connected in a known and commonly used manner, and the contact area can also be optimized and determined according to the specific situation. Preferably, ultrasonic welding is used for fixed connection, which can have better fusion, reduce internal resistance, and facilitate temperature control during use.

[0033] 2. Fixing the pole and the pressing piece by riveting, you can apply pressure during the riveting process to compress the sealing ring to a predetermined amount. This method is not only easy to operate, but also improves the reliability of the seal. At present, the field generally compresses the sealing ring when welding and fixing the pole and the pressing piece, and requires the compression rate of the sealing ring to be controlled at 26%-43%. The method of compressing the sealing ring during the riveting process described in the utility model can stabilize the compression rate at 30%-40%; welding and fixing the mutually riveted pressing part and the cover plate is simple and convenient to operate and has stable quality.

[0034] 3. The sinking platform structure can be easily formed by using existing technology (such as stamping), and the parameters of the sinking platform, such as shape and depth, can be determined according to the specific conditions of the product. When the end surface of the first insulating member away from the cover plate and the end surface of the pressing portion are basically on the same plane perpendicular to the axial direction of the pole; the end surface of the cover plate sinking platform located on the second side of the cover plate does not exceed the end surface of the pressing portion, or is basically on the same plane perpendicular to the axial direction of the pole with the end surface of the pressing portion, the part of the sinking platform structure extending outward does not occupy additional space.

[0035] 4. Due to the use of a sunken platform structure, the connecting piece and the pole pressing part are placed in the sunken platform structure as an integrated structure, which can reduce the size of the pole and select a short pole ear to connect with the connecting piece. In this way, the thickness of the first insulating member can be greatly reduced, and ultimately the top cover space is significantly reduced to 6.55mm; at the same time, the length of the pole ear is shortened, and the battery can be installed in reverse, that is, the battery cell is installed upward and the top cover is installed downward, thereby increasing safety in use.

[0036] In summary, the power battery top cover structure of the utility model is stable, has excellent performance, and can effectively reduce the battery top cover space, providing a new idea for improving the space utilization rate and volume energy density of the power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 This is an exploded schematic diagram of the power battery top cover of the utility model;

[0039] Figure 2 It is a partial cross-sectional view of the power battery top cover of the utility model. DETAILED DESCRIPTION

[0040] In order to make the technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0041] In the description of the present invention, it should be noted that the terms "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are 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 understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] It is important to note that the construction and arrangement of the present application shown in the embodiments are only exemplary, and those who refer to this disclosure should easily understand that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangements, use of materials, color, changes in orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the elements shown as integrally formed can be composed of multiple parts or elements, the positions of the elements can be inverted or otherwise changed, and the properties or number or position of the discrete elements can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other substitutions, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to several modifications still falling within the scope of the appended claims.

[0044] Furthermore, in order to provide a concise description of the exemplary embodiments, not all features of the actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the present invention, or those features that are not relevant to the implementation of the present invention) may be described. Moreover, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0045] The utility model provides a new power battery top cover, which has a stable structure and can effectively reduce the battery top cover space.

[0046] The utility model also provides a power battery comprising the power battery top cover.

[0047] like Figure 1 , 2 A power battery top cover shown includes

[0048] A cover plate 1, on which a mounting through hole 11 is provided;

[0049] The pole 2 comprises a pressing portion 21 abutting against the first side of the cover plate 1, a column portion 22 axially passing through the mounting through hole 11, and a pressing portion 23 penetrating from the second side of the cover plate 1;

[0050] A pressing sheet 3, used for fixing and connecting the pressing portion 23 and the cover plate 1;

[0051] A first insulating member 4 is disposed between the pressing portion 21 and the first side of the cover plate 1;

[0052] A connecting piece 5, on which a connecting through hole 51 is provided, through which the pole 2 passes, and is abutted between the pressing portion 21 and the first insulating member 4, and the connecting piece 5 is fixedly connected to the pressing portion 21;

[0053] in,

[0054] The cover plate 1 and the first insulating member 4 are both provided with a sinking platform protruding toward the second side of the cover plate 1 , the sinking platform 6 of the first insulating member is embedded in the sinking platform 7 of the cover plate, and the pressing portion 21 and the connecting piece 5 are arranged in the sinking platform 6 of the first insulating member.

[0055] As is well known in the art, the power battery top cover further includes a sealing ring 8 , which is sleeved on the outer peripheral side of the column portion 22 , compressed in the axial direction and pressed against the cover plate 1 in the radial direction to seal the mounting through hole 11 . Figure 2The sealing ring 8 is in the position during the assembly process, showing the state before being compressed. When manufacturing the power battery top cover, the sealing ring 8 will be compressed in the axial direction, produce radial and axial deformation, and squeeze into the gap between the sealing ring 8 and the cover plate 1 and the first insulating member 4, so that a tight abutment is formed between the cover plate 1 and the sealing ring 8, thereby sealing the mounting through hole 11. This process of compression, deformation, and sealing is a prior art in the field and does not need to be elaborated. The power battery top cover may also include a second insulating member 9, which is abutted between the second side of the cover plate 1 and the pressing sheet 3. The sealing ring may also partially abut between the second insulating member 9 and the column portion 22 after being compressed and deformed.

[0056] The connecting piece 5 and the pressing portion 21 can be fixedly connected by a known and commonly used method, such as laser welding, and preferably by ultrasonic welding to obtain a better fusion degree.

[0057] Preferably, the pressing sheet 3 and the pressing portion 23 are connected by riveting.

[0058] Preferably, the end surface of the first insulating member 4 away from the cover plate and the end surface of the pressing portion 23 are substantially on the same plane perpendicular to the axial direction of the pole; the end surface of the cover plate sink 7 located on the second side of the cover plate 1 does not exceed the end surface of the pressing portion 23, or is substantially on the same plane perpendicular to the axial direction of the pole with the end surface of the pressing portion 23. In this way, the sink structure can not only be used to accommodate the connecting piece 5 and the pole pressing portion 21, saving the top cover space, but also its outwardly protruding part will not occupy additional space.

[0059] The power battery top cover is used in the manufacture of a power battery, and a power battery including the power battery top cover can be obtained.

[0060] Specifically, Figure 1 and 2 The power battery top cover shown is manufactured via the following steps:

[0061] The first step is to pass the pole 2 through the connecting through hole 51 on the connecting sheet 5, so that the connecting sheet 5 is fixedly connected to the pressing portion 21, and ultrasonic welding is preferably used for the fixed connection;

[0062] Step 2: The pole 2 is passed through the first insulating member 4, the sealing ring 8, the cover plate 1, the second insulating member 9 and the pressing piece 3 in sequence, so that the pressing portion 23 and the connecting piece 5 are located in the sinking platform 6 of the first insulating member, and the sinking platform 6 of the first insulating member is embedded in the sinking platform 7 of the cover plate;

[0063] The third step is to first connect the pressing piece 3 to the pole 2 by riveting, to form a pressing portion 23 at the end of the pole 2, and to compress the sealing ring 8 in the axial direction and press it against the cover plate 1 in the radial direction to seal the installation through hole 51, and then weld the pressing portion 23 and the cover plate 1 to fix them.

[0064] The above description is only for the purpose of facilitating the technical solution of the present invention to be understood by those skilled in the art, and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A power battery top cover, characterized in that: include A cover plate, on which a mounting through hole is provided; A pole, comprising a pressing portion abutting against a first side of the cover plate, a column portion axially passing through the mounting through hole, and a pressing portion penetrating from a second side of the cover plate; A pressing sheet, used for fixedly connecting the pressing portion and the cover plate; A first insulating member is disposed between the pressing portion and the first side of the cover plate; A connecting piece, on which a connecting through hole is provided, the pole passes through the connecting through hole, is abutted between the pressing part and the first insulating member, and the connecting piece is fixedly connected to the pressing part; in, The cover plate and the first insulating member are both provided with a sinking platform protruding toward the second side of the cover plate, the sinking platform of the first insulating member is embedded in the sinking platform of the cover plate, and the pressing portion and the connecting piece are arranged in the sinking platform of the first insulating member.

2. The power battery top cover according to claim 1, characterized in that: The pressing sheet and the pressing portion are connected by riveting.

3. The power battery top cover according to claim 1 or 2, characterized in that: It also includes a sealing ring, which is sleeved on the outer peripheral side of the column part, compressed in the axial direction and pressed against the cover plate in the radial direction to seal the installation through hole.

4. The power battery top cover according to claim 1, characterized in that: The connecting piece and the pressing portion are fixedly connected by ultrasonic welding.

5. The power battery top cover according to claim 1, characterized in that: It also includes a second insulating member, which is disposed between the second side of the cover plate and the pressing sheet.

6. The power battery top cover according to claim 1, characterized in that: The end surface of the first insulating member away from the cover plate and the end surface of the pressing portion are substantially on the same plane perpendicular to the axial direction of the pole; The end surface of the cover plate sink located on the second side of the cover plate does not exceed the end surface of the pressing portion, or is substantially on the same plane as the end surface of the pressing portion and is perpendicular to the axial direction of the pole.

7. A power battery comprising the power battery top cover according to any one of claims 1 to 6.

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