Top cover assembly and battery

Abstract

The utility model belongs to the technical field of battery structures, and discloses a top cover assembly and a battery. The top cover assembly comprises a cover plate main body and a pole, a sinking part is arranged on the cover plate main body in a sunken mode, an installation space is formed in the sinking part, the inner wall of the sinking part protrudes to form a limiting protrusion, the pole is arranged in the installation space in a sealed mode, and a limiting groove is formed in the side wall of the pole. The limiting bulge is inserted into the limiting groove so as to fixedly connect the pole to the cover plate main body, and the pole can be electrically connected with a battery cell positioned on the bottom side of the cover plate main body and is insulated from the cover plate main body. By forming the limiting bulge and the limiting groove, the fixing requirement of the pole can be met, so that the welding step in the prior art is avoided, the connection strength of the pole and the aluminum block is ensured, deformation caused by welding and the influence of the deformation on the sealing property are reduced, the structure of the aluminum block is omitted, and the cost is reduced. Therefore, the weight and the structural cost of the top cover assembly are further reduced, and the weight and the cost of the battery are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery structure technical field especially relates to a top cap subassembly and battery. BACKGROUND

[0002] In the current manufacturing technology field, the traditional riveting top cap process is widely used in the processes such as battery packaging. This process first needs to rivet and fix the pole and the aluminum block, and the riveting process tightly combines the two through mechanical force, ensuring the preliminary connection stability and structural strength. However, this process does not end at the riveting step, and then the riveted pole and aluminum block need to be welded, aiming to further enhance their bonding force and conductivity.

[0003] But this welding link introduces new problems. Due to the high temperature generated in the welding process, the difference in the thermal expansion coefficient of the pole and the aluminum block material may cause slight deformation in the welding part and the surrounding area. Although this deformation may not be easily detected macroscopically, it is enough to threaten the sealing performance of the battery for the precise battery structure. The reduction of sealing may make the battery more susceptible to external environment during use, such as internal short circuit caused by moisture intrusion, or electrolyte leakage, etc., thereby seriously affecting the long-term reliability and service life of the battery.

[0004] Therefore, there is an urgent need for a top cap subassembly and battery to solve the above technical problems. INVENTION CONTENTS

[0005] The utility model aims at providing a top cap subassembly which can reduce the deformation caused by welding and its impact on sealing while ensuring the connection strength of the pole and the aluminum block.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The top cap subassembly comprises:

[0008] The cover plate body is provided with a sunken part in a recessed manner, an installation space is formed in the sunken part, and the inner wall of the sunken part protrudes to form a limiting protrusion;

[0009] The pole is sealingly arranged in the installation space, and the side wall of the pole is provided with a limiting groove, the limiting protrusion is inserted into the limiting groove to fixedly connect the pole to the cover plate body, and the pole can be electrically connected to the battery cell located at the bottom side of the cover plate body and is insulated from the cover plate body.

[0010] As preferably, the top of the pole is exposed outside the sunken part, and the bottom of the sunken part is provided with a connecting hole, the electric core is welded with an electric connecting piece, the electric connecting piece passes through the connecting hole and is electrically connected to the bottom of the pole.

[0011] As preferably, the top cover assembly further comprises an insulating sealing piece, the insulating sealing piece is clamped between the pole and the inner wall of the sunken part, and insulates between the pole and the cover plate body.

[0012] As preferably, along the depth direction of the sunken part, the inner wall of the sunken part is provided with at least one limiting protrusion, and the pole is correspondingly provided with at least one limiting groove.

[0013] As preferably, the limiting groove is arranged to extend around the circumferential direction of the pole to form an annular groove, and the limiting protrusion is correspondingly formed as an annular protrusion on the inner wall of the sunken part.

[0014] As preferably, the bottom of the pole abuts against the bottom of the sunken part, and the top of the pole protrudes out of the sunken part.

[0015] As preferably, the top of the pole is provided with an annular flange.

[0016] As preferably, the top cover assembly further comprises an upper plastic piece, the upper plastic piece is insulatively arranged between the annular flange and the cover plate body.

[0017] As preferably, the pole is a hollow thin-walled structure, and the limiting protrusion and the limiting groove are synchronously formed on the cover plate body and the pole by at least one of the following ways: spin riveting, necking, and bulging.

[0018] The top cover assembly has the following advantages: the limiting protrusion and the limiting groove can meet the fixing needs of the pole, thereby avoiding the welding step in the prior art, and further reducing the deformation caused by welding and the influence on the sealing performance while ensuring the connection strength of the pole and the aluminum block. Compared with riveting the pole with the aluminum block, the cooperation of the limiting protrusion and the limiting groove can ensure the connection strength of the pole and the aluminum block while saving the aluminum block structure, thereby further reducing the weight and structural cost of the top cover assembly, which is conducive to reducing the weight and manufacturing cost of the battery and improving the energy density of the battery.

[0019] The utility model discloses a battery with good structural strength and sealing performance.

[0020] To achieve the purpose, the utility model adopts the following technical scheme:

[0021] A battery includes a cell, a housing, and the above-mentioned top cover assembly, the cell is arranged in the housing, and the top cover assembly is arranged at the opening of the housing in a sealed manner.

[0022] The battery provided by the utility model has the advantages that the limiting protrusion and the limiting groove are formed, the fixing requirement for the pole is met, the welding step in the prior art is avoided, the aluminum block structure is saved, the connection strength of the pole and the aluminum block is ensured, the deformation caused by welding and the influence of the deformation on the sealing performance are reduced, the weight and the structural cost of the top cover assembly are reduced, the weight and the manufacturing cost of the battery are reduced, and the energy density of the battery is improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is the top view of the top cover assembly provided by the utility model;

[0024] Figure 2 is the sectional view along the A-A direction of the middle part; Figure 1

[0025] Figure 3 is the bottom view of the top cover assembly provided by the utility model.

[0026] In the drawings:

[0027] 1, cover plate body; 11, sunken part; 111, limiting protrusion; 112, connecting hole;

[0028] 2, pole; 21, limiting groove; 22, annular flange;

[0029] 3, insulating sealing element;

[0030] 4, upper plastic element;

[0031] 5, lower plastic element; 51, via hole. DETAILED DESCRIPTION

[0032] The utility model will be further described in detail in combination with the drawings and examples. It can be understood that the specific examples described herein are only used to explain the utility model and are not limited to the utility model. In addition, it should be noted that, in order to facilitate the description, only the parts related to the utility model are shown in the drawings, not all structures.

[0033] ​In the description of the utility model, unless another definite provision and limitation, the term "link", "connect", "fix" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication or two elements of the interaction relationship.For the ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0034] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features direct contact, also can include the first and second features are not direct contact but contact through the additional features between them.Moreover, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the horizontal height of the first feature is higher than the second feature.The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the horizontal height of the first feature is less than the second feature.

[0035] In the description of the embodiment, the orientation or position relationship of the terms "on", "under", "right", "left" and the like is based on the orientation or position relationship shown in the drawing, only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model.In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0036] The following is according to the drawings Figure 1 to the drawings Figure 3 The utility model provides a top cover assembly and battery.

[0037] As Figure 1 , Figure 2 As shown in the utility model in the embodiment, the top cover assembly includes cover plate body 1 and pole 2.The recessed setting of cover plate body 1 has sunken part 11, and the installation space is formed in sunken part 11, and the inner wall of sunken part 11 is protruding and forms limiting protrusion 111.Pole 2 is sealed in the installation space, and the side wall of pole 2 is provided with limiting groove 21.Limiting protrusion 111 formed in the inner wall of sunken part 11 can be inserted into limiting groove 21 of pole 2, so as to fix and connect pole 2 to cover plate body 1.

[0038] By forming the limiting protrusion 111 and the limiting groove 21, the fixing requirement of the pole column 2 can be met, so as to avoid the welding step in the prior art, thereby reducing the deformation caused by welding and the influence on the sealing while ensuring the connection strength of the pole column 2 and the aluminum block. At the same time, compared with riveting the pole column 2 by using the aluminum block, the cooperation of the limiting protrusion 111 and the limiting groove 21 can ensure the connection strength of the pole column 2 and the aluminum block while eliminating the aluminum block structure, thereby further reducing the weight and structural cost of the top cover assembly, which is beneficial to reduce the weight and manufacturing cost of the battery and improve the energy density of the battery.

[0039] Specifically, as shown in Figure 2 , Figure 3 In the embodiment, the top of the pole column 2 is exposed to the sunken part 11, so as to facilitate the abutment or welding connection of the electrical connecting piece outside the battery to the top of the pole column 2, thereby electrically connecting the electrical connecting piece outside the battery and one end of the pole column 2. Exemplarily, the electrical connecting piece can adopt a cable, and the end of the cable is provided with a welding part which can be welded to the top of the pole column 2.

[0040] At the same time, the bottom of the sunken part 11 is provided with a connecting hole 112, and the battery cell is welded with another electrical connecting piece which is arranged through the connecting hole 112 and electrically connected to the bottom of the pole column 2. Through the electrical connecting piece, the electrical connection between the pole column 2 and the battery cell can be achieved. Exemplarily, the electrical connecting piece can adopt a pin, one end of which is welded to the pole column 2 through the connecting hole 112, and the other end of which is electrically connected to the electrode of the corresponding polarity of the battery cell inside the battery. In this way, through the pin and the cable described above, the electrical connection between the battery cell and the circuit outside the battery can be achieved.

[0041] Continuing to refer to Figure 2 In the embodiment, the top cover assembly further comprises an insulating sealing piece 3 which is clamped between the pole column 2 and the inner wall of the sunken part 11 and insulates the pole column 2 and the cover plate body 1. Through the insulating sealing piece 3, the leakage between the pole column 2 and the cover plate body 1 can be prevented, and the impurities such as water and dust from the outside can be prevented from entering the inside of the battery through the gap between the pole column 2 and the cover plate body 1, thereby avoiding the risk of performance degradation, short circuit, explosion, etc. Specifically, the insulating sealing piece 3 can adopt an insulating sealing piece 3 made of rubber material, so as to achieve better sealing effect and insulation effect at the same time.

[0042] Specifically, in the embodiment, the inner wall of the sunken part 11 is provided with a limiting protrusion 111 in the depth direction of the sunken part 11, and the pole 2 is correspondingly provided with a limiting groove 21, the limiting protrusion 111 is inserted into the limiting groove 21, thereby fixing and connecting the pole 2 and the cover plate body 1. Alternatively, in some other embodiments, the inner wall of the sunken part 11 is provided with two limiting protrusions 111 in the depth direction of the sunken part 11, and the pole 2 is correspondingly provided with two limiting grooves 21. Each limiting protrusion 111 is correspondingly inserted into one limiting groove 21, thereby fixing and connecting the pole 2 and the cover plate body 1. It can be understood that setting a larger number of limiting protrusions 111 and limiting grooves 21 can improve the connection stability and connection strength between the pole 2 and the cover plate body 1, so the number of limiting protrusions 111 and limiting grooves 21 in the utility model is not limited, as long as it can achieve the effect of fixing and connecting the pole 2 and the cover plate body 1.

[0043] Further, in the embodiment, the sunken part 11 is in a circular hole shape, and the installation space is a cylindrical space. Moreover, the limiting groove 21 is arranged to extend around the circumferential direction of the pole 2 to form an annular groove, and the limiting protrusion 111 is correspondingly formed as an annular protrusion on the inner wall of the sunken part 11. The annular shape can make the connection between the pole 2 and the cover plate body 1 more stable, improve the resistance to external force in various directions, and also help to improve the sealing performance of the insulating sealing member 3 between the pole 2 and the cover plate body 1, further preventing leakage between the pole 2 and the cover plate body 1.

[0044] Preferably, the top of the pole 2 is provided with an annular flange 22, and the annular flange 22 protrudes from the sunken part 11. The annular flange 22 can form a larger connection area, facilitating the welding or abutting of the cable and other electrical connecting members, thereby improving the stability of the electrical connection. At the same time, the annular flange 22 can also improve the structural strength of the pole 2, thereby further ensuring the structural strength of the top cover assembly.

[0045] Alternatively, the top cover assembly further comprises an upper plastic member 4, which is insulated between the annular flange 22 and the cover plate body 1, thereby avoiding the formation of an electrical connection between the pole 2 and the cover plate body 1 through the annular flange 22, which may cause short circuit and other hazards.

[0046] Preferably, in the embodiment, the pole column 2 is a hollow thin-walled structure, and the limiting protrusion 111 and the limiting groove 21 are synchronously formed on the cover plate body 1 and the pole column 2 by at least one of the following modes: spin riveting, necking, and bulging. For example, in the spin riveting process, the insulating sealing member 3 and the pole column 2 without the limiting groove 21 are sequentially placed into the sunken part 11, and then the outer wall surface of the sunken part 11 is extruded by the spin riveting mode, so that the limiting protrusion 111 and the limiting groove 21 are synchronously formed, and the pole column 2, the insulating sealing member 3, and the cover plate body 1 are fixedly connected.

[0047] Optionally, the upper plastic part 4 has a ring structure. During installation, the pole column 2 without the limiting groove 21 is first inserted through the upper plastic part 4, then the insulating sealing member 3 and the pole column 2 are sequentially placed into the sunken part 11, and finally the limiting protrusion 111 and the limiting groove 21 are synchronously formed by at least one of the following modes: spin riveting, necking, and bulging, so that the pole column 2, the upper plastic part 4, the insulating sealing member 3, and the cover plate body 1 are fixedly connected.

[0048] Further, the top cover assembly further comprises a lower plastic part 5, the lower plastic part 5 can be attached to the bottom surface of the cover plate body 1, and the lower plastic part 5 is provided with a via hole 51 corresponding to the connecting hole 112, and the electric connecting member can pass through the via hole 51 and the connecting hole 112 and be electrically connected to the bottom of the pole column 2.

[0049] The utility model also provides a kind of battery, and the battery includes electric core, shell and above-mentioned top cover assembly, electric core is arranged in shell, and top cover assembly is sealed and arranged at the opening of shell. By forming limiting protrusion 111 and limiting groove 21, the fixing needs of pole column 2 can be met, so that the welding step in the prior art is avoided, and then while ensuring the connection strength of pole column 2 and aluminum block, the deformation caused by welding and its influence on sealing are reduced. At the same time, compared with riveting fixation of pole column 2 using aluminum block, the cooperation of limiting protrusion 111 and limiting groove 21 can ensure the connection strength of pole column 2 and aluminum block while saving aluminum block structure, so as to further reduce the weight and structural cost of top cover assembly, which is conducive to reducing the weight and manufacturing cost of battery and improving the energy density of battery.

[0050] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not the limitation of the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be carried out without departing from the protection scope of the utility model. Here, it is unnecessary and impossible to enumerate all embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model shall be included in the protection scope of the utility model claim.

Claims

1. A roof assembly, characterized in that The top cover assembly comprises: a cover plate body (1) provided with a sunken portion (11) in a recessed manner, an installation space is formed in the sunken portion (11), and an inner wall of the sunken portion (11) protrudes to form a limiting protrusion (111); a pole (2) which is sealingly arranged in the installation space, and a limiting groove (21) is arranged on a side wall of the pole (2), the limiting protrusion (111) is inserted into the limiting groove (21) to fixedly connect the pole (2) to the cover plate body (1), and the pole (2) can be electrically connected to a battery cell located at a bottom side of the cover plate body (1) and is insulated from the cover plate body (1).

2. The top cover assembly according to claim 1, wherein a top portion of the pole (2) is exposed to the sunken portion (11), and a bottom portion of the sunken portion (11) is provided with a connecting hole (112), an electrical connecting member is welded to the battery cell, and the electrical connecting member passes through the connecting hole (112) and is electrically connected to a bottom portion of the pole (2).

3. The top cover assembly according to claim 2, wherein the top cover assembly further comprises an insulating sealing member (3) which is clamped between the pole (2) and an inner wall of the sunken portion (11) and insulates the pole (2) from the cover plate body (1).

4. The top cover assembly according to claim 1, wherein at least one limiting protrusion (111) is arranged on the inner wall of the sunken portion (11) along a depth direction of the sunken portion (11), and at least one limiting groove (21) is correspondingly arranged on the pole (2).

5. The top cover assembly according to claim 1, wherein the limiting groove (21) is arranged to extend around a circumferential direction of the pole (2) to form an annular groove, and an annular protrusion is correspondingly formed on the inner wall of the sunken portion (11).

6. The top cover assembly according to claim 1, wherein a bottom portion of the pole (2) abuts against a bottom portion of the sunken portion (11), and a top portion of the pole (2) protrudes from the sunken portion (11).

7. The top cover assembly according to claim 6, wherein the top portion of the pole (2) is provided with an annular flange (22).

8. The top cover assembly according to claim 7, wherein the top cover assembly further comprises an upper plastic member (4) which is insulatively arranged between the annular flange (22) and the cover plate body (1).

9. The top cover assembly according to any one of claims 1-8, wherein the pole (2) is a hollow thin-walled structure, and the limiting protrusion (111) and the limiting groove (21) are synchronously formed on the cover plate body (1) and the pole (2) by at least one of the following methods: spin riveting, necking, and bulging.

10. A battery characterized by The battery includes a cell, a housing, and a top cover assembly as claimed in any one of claims 1-9, the cell is disposed in the housing, and the top cover assembly is sealingly disposed at an opening of the housing.

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