Battery cell shell assembly and battery cell assembly

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cell shell assembly and a battery cell assembly, the battery cell shell assembly comprises: a shell, the top surface of which is provided with a connecting hole and a welding hole; the connecting piece assembly is located at the top of the containing space and comprises two connecting pieces, and the connecting pieces correspond to the assembling holes; a pole assembly; and the plugging piece comprises a sealing plate and an insulating plate which are sequentially arranged from top to bottom, and the sealing plate and the insulating plate are in fusion connection through the connecting column and the connecting groove. The condition that the remaining parts can be assembled only after the connecting piece is independently welded and fixed with the pole lug is avoided, so that the shell, the connecting piece assembly and the pole assembly can be pre-assembled in advance, the assembling steps during the assembling of the battery core assembly are reduced, the sealing plate and the insulating plate are in fusion connection through the groove and the pole, and the assembling efficiency is improved. The production process is simple and efficient, and the connection reliability of the sealing plate and the insulating plate can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery cell housing assembly and a battery cell assembly. Background Art

[0002] With the rapid development of new energy technologies, power batteries have been increasingly widely used in various electric tools and new energy vehicles due to their excellent characteristics. The safety during the use of power batteries is one of the indicators that cannot be ignored. Power batteries not only need to have a high capacity but also should have good reliability in use. As an important part of power batteries, the cover plate assembly plays a role in draining and sealing the power batteries.

[0003] Currently, the electrode tabs of the battery cells in existing power batteries are mainly connected to the corresponding electrode posts through connecting pieces. The corresponding positions of the electrode tabs and the connecting pieces are connected by welding to ensure their current-carrying capacity. When manufacturing power batteries, independent battery cells, connecting pieces, electrode posts, cover plates and other components need to be sent to the assembly workshop before the components can be assembled in sequence. The entire assembly process has many steps and takes a long time, which is time-consuming and laborious, and there is a problem of low production efficiency. Summary of the Utility Model

[0004] In view of this, the utility model provides a battery cell housing assembly and a battery cell assembly to solve the problem of low assembly production efficiency of existing power batteries.

[0005] In a first aspect, the utility model provides a battery cell housing assembly, including: a housing with an accommodation space inside for installing a battery cell, and two sets of assembly holes are provided on the top surface of the housing. The assembly holes include connection holes and welding holes; a connecting piece assembly located at the top of the accommodation space and including two connecting pieces, the connecting pieces are arranged corresponding to the assembly holes. Each connecting piece includes a pole connection part and an ear connection part connected in sequence. The pole connection part is arranged corresponding to the connection hole, and the ear connection part is arranged corresponding to the welding hole. The ear connection part is used to connect with the electrode tab of the battery cell; a pole assembly including two poles respectively passing through the corresponding connection holes, and the poles are connected to the corresponding pole connection parts through the connection holes; a plugging member matching the shape of the welding hole and used to plug the welding hole. The plugging member includes a sealing plate and an insulating plate arranged in sequence from top to bottom. The sealing plate is connected to the housing, and a connecting post is provided on one of the sealing plate and the insulating plate, and a connecting groove is provided on the other one. The sealing plate and the insulating plate are melt-connected through the connecting post and the connecting groove.

[0006] Beneficial effects: A welding hole is opened on the top surface of the housing. When assembling the battery cell assembly, the tab and the connecting piece can be directly welded through the welding hole. By simply changing the structure, the assembly sequence of the components of the battery cell assembly is changed, avoiding the situation where the connecting piece needs to be welded to the tab separately before the remaining components can be assembled. This enables the pre-assembly of the housing, the connecting piece assembly, and the terminal assembly in advance, greatly reducing the assembly steps during the assembly of the battery cell assembly. In addition, the sealing plate and the insulating plate are melt-connected in the form of a groove and a post, which not only simplifies and improves the production process but also enhances the connection reliability between the sealing plate and the insulating plate, effectively solving the problem of low assembly production efficiency of existing power batteries.

[0007] In an alternative embodiment, a connecting groove with a downward opening is provided on the bottom surface of the sealing plate, and a connecting post extending upward is provided on the top surface of the insulating plate. The cross-sectional area of the connecting groove gradually decreases from top to bottom.

[0008] Beneficial effects: After melting, the connecting post can form a connecting body that matches the groove body of the connecting groove, not only increasing the contact area of the melt connection but also effectively preventing the connecting post from detaching from the connecting groove, further enhancing the connection strength between the sealing plate and the insulating plate.

[0009] In an alternative embodiment, the cross-sections of both the connecting groove and the connecting post are circular. The diameter range of the opening of the connecting groove is 0.5 mm to 0.6 mm, and / or the diameter of the cross-section of the opening of the connecting groove is at least 0.3 mm smaller than the diameter of the cross-section of the top surface of the connecting groove.

[0010] Beneficial effects: This form of connecting groove and connecting post is convenient for manufacturing and can also ensure the fixing effect after melt connection.

[0011] In an alternative embodiment, the thickness range from the top surface of the connecting groove to the top surface of the sealing plate is 0.2 mm to 1.5 mm, and / or the height of the connecting post before assembly is at least 0.25 mm greater than the depth of the connecting groove.

[0012] Beneficial effects: While ensuring that the strength of the sealing plate meets the requirements, it can also ensure the strength of the melt connection.

[0013] In an alternative embodiment, a plurality of connecting grooves and connecting posts are provided in pairs and at intervals along the length direction of the plugging member.

[0014] Beneficial effects: The connecting grooves and the connecting posts are melt-connected at multiple positions along the length direction, ensuring that the two components can be closely fitted, meeting the insulation performance between the tab and the sealing plate, and improving the reliability of the battery.

[0015] In an optional embodiment, the welding hole includes a first hole segment and a second hole segment from top to bottom, the cross-sectional area of the second hole segment is smaller than the cross-sectional area of the first hole segment, the connecting surface of the first hole segment and the second hole segment forms a step surface, and the sealing plate cooperates with the step surface.

[0016] Beneficial effect: The step surface can quickly and effectively locate the sealing plate in the vertical direction, thereby improving the assembly accuracy and speed of the sealing piece.

[0017] In an optional embodiment, the top surface of the pole tab connecting portion forms a connection surface for connecting with the pole tab.

[0018] Beneficial effect: Since the connection surface connected to the pole ear is located at the top of the pole ear connection part, after the pole ears are connected to the pole ear connection parts, not only is the structure more compact and occupies less space, but when the pole ear connection part is pulled down by the pole ear, one side of the pole connection part will tend to curl up, so that the poles and pole connections can fit more closely and reduce the risk of separation.

[0019] In an optional embodiment, a through groove is formed at one end of the tab connection portion of the connection sheet away from the pole connection portion in a direction close to the pole connection portion, and top surfaces of the tab connection portion on both sides of the through groove respectively form connection surfaces.

[0020] Beneficial effects: This type of pole lug connection is lighter in weight, one pole lug connection can be connected to two pole lugs at the same time, and the structure is simple and reliable.

[0021] In the second aspect, the utility model also provides a battery cell assembly, which includes: the above-mentioned battery cell shell assembly; a battery cell, which is arranged in the accommodating space of the battery cell shell assembly and has a pole ear on the top, the pole ear includes a connecting section and a bending section, the connecting section is located on one side of the pole ear connecting part of the battery cell shell assembly, the bending section is connected to the top of the connecting section and extends along the top surface of the pole ear connecting part, and the pole ears are welded to the pole ear connecting parts.

[0022] In an optional embodiment, the positive electrode and the negative electrode of the battery cell are respectively provided with two pole ears, and the two pole ears of one pole are relatively arranged on both sides of the corresponding pole ear connection portion, and the bending sections of the two pole ears are welded to the same pole ear connection portion.

[0023] Beneficial effects: The structure is simple and reliable. The two tabs of this arrangement occupy less space after assembly, and the force on the tab connection is more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 3D schematic diagram of a cell housing assembly according to an embodiment of the present invention;

[0026] Figure 2 For Figure 1 Top view of the cell housing assembly shown;

[0027] Figure 3 For Figure 2 A - A cross - sectional view of the cell housing assembly shown;

[0028] Figure 4 For Figure 3 Enlarged schematic view of part B of the cell housing assembly shown;

[0029] Figure 5 For Figure 1 3D schematic diagram of the cell housing assembly when the insulating plate is not assembled;

[0030] Figure 6 For Figure 1 3D schematic diagram of the cell housing assembly after assembly and before installing the plugging member;

[0031] Figure 7 For Figure 6 3D schematic diagram of the cell housing assembly when the tab is not bent during assembly;

[0032] Figure 8 For Figure 7 3D schematic diagram of the cell housing assembly when the housing is not shown and the tab is not bent during assembly.

[0033] Explanation of reference numerals:

[0034] 1. Housing; 101. Accommodating space; 102. Welding hole; 1021. First hole section; 1022. Second hole section; 1023. Step surface;

[0035] 2. Connecting piece; 201. Pole connection part; 202. Tab connection part; 2021. Connection surface; 2022. Through groove;

[0036] 3. Pole

[0037] 4. Sealing element; 401. Sealing plate; 4011. Connection groove; 402. Insulating plate; 4021. Connection post;

[0038] 5. Explosion-proof valve;

[0039] 6. Battery cell; 601. Tab; 7. First insulating member; 8. Second insulating member. Detailed implementation manners

[0040] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0041] The following combines Figures 1 to 8 to describe the embodiments of the present utility model.

[0042] According to an embodiment of the present utility model, on the one hand, a battery cell housing assembly is provided, including: a housing 1, a connection piece assembly, a pole column assembly, and a sealing element 4. The housing 1 has an accommodation space 101 for installing a battery cell 6 inside. Two sets of assembly holes are provided on the top surface of the housing 1. The assembly holes include connection holes and welding holes 102. The connection piece assembly is located at the top of the accommodation space 101 and includes two connection pieces 2. The connection pieces 2 are arranged corresponding to the assembly holes. The connection piece 2 includes a pole column connection portion 201 and a tab connection portion 202 connected in sequence. The pole column connection portion 201 is arranged corresponding to the connection holes, and the tab connection portion 202 is arranged corresponding to the welding holes 102. The tab connection portion 202 is used to connect with the tab 601 of the battery cell 6. The pole column assembly includes two pole columns 3 correspondingly passing through the connection holes. The pole columns 3 are connected to the corresponding pole column connection portions 201 through the connection holes. The sealing element 4 matches the shape of the welding holes 102 and is used to seal the welding holes 102. The sealing element 4 includes a sealing plate 401 and an insulating plate 402 arranged in sequence from top to bottom. The sealing plate 401 is connected to the housing 1. A connection post 4021 is provided on one of the sealing plate 401 and the insulating plate 402, and a connection groove 4011 is provided on the other. The sealing plate 401 and the insulating plate 402 are melt-connected through the connection post 4021 and the connection groove 4011.

[0043] When applying the battery cell housing assembly of this embodiment, a welding hole 102 is opened on the top surface of the housing 1. During the assembly of the battery cell assembly, the tab 601 and the connecting piece 2 can be directly welded through the welding hole 102. By simply changing the structure, the component assembly sequence of the battery cell assembly is changed, avoiding the situation where the connecting piece 2 needs to be welded to the tab 601 separately before the remaining components can be assembled. This enables the pre-assembly of the housing 1, the connecting piece assembly, and the terminal assembly in advance, greatly reducing the assembly steps during the assembly of the battery cell assembly. In addition, the sealing plate 401 and the insulating plate 402 are melt-connected in the form of a groove and a post, which not only simplifies and improves the production process but also enhances the connection reliability between the sealing plate 401 and the insulating plate 402, effectively solving the problem of low assembly production efficiency of existing power batteries.

[0044] Herein, it should be noted that the top refers to Figure 3 the side in the "up" direction indicated by the arrow in Figure 3 and the bottom refers to

[0045] Specifically, there is no limitation on the connection method between the plugging member 4 and the housing 1, which can be welding, bonding, or connection through fastening components, etc., and can be flexibly selected according to requirements.

[0046] Furthermore, compared with the connection of the sealing plate 401 and the insulating plate 402 through independent connecting components, the melt-connection of the sealing plate 401 and the insulating plate 402 in the form of a groove and a post has high strength and low cost, and can be mass-produced in a single process. The overall appearance of the sealing plate 401 and the insulating plate 402 after this form of connection is more beautiful, the integrity of the outer wall is better, and problems such as liquid leakage are not likely to occur.

[0047] In a possible implementation manner, a downward-opening connection groove 4011 is provided on the bottom surface of the sealing plate 401, and an upward-extending connection post 4021 is provided on the top surface of the insulating plate 402. The cross-sectional area of the connection groove 4011 gradually decreases from top to bottom. After the connection post 4021 is melted, a connection body matching the groove body of the connection groove 4011 can be formed, which not only increases the contact area of the melt-connection but also effectively prevents the connection post 4021 from detaching from the connection groove 4011, further enhancing the connection strength between the sealing plate 401 and the insulating plate 402.

[0048] It can be understood that as an alternative implementation manner, the cross-sectional area of the connection groove 4011 can also increase first and then decrease multiple times from top to bottom.

[0049] Herein, it should be noted that the cross-section and the cross-sectional area refer to the section of the plane perpendicular to Figure 3 the "up and down" direction indicated by the arrow in Figure 5As shown, in order for the connecting post 4021 to be inserted into the connecting groove 4011, when the connecting post 4021 is not assembled, the maximum cross-sectional area of the connecting post 4021 is less than or equal to the maximum cross-sectional area of the connecting groove 4011. The melting connection step is carried out only after the connecting post 4021 is inserted into the connecting groove 4011.

[0050] Specifically, the specific shapes of the connecting post 4021 and the connecting groove 4011 are not limited. The cross-sections of the connecting post 4021 and the connecting groove 4011 can be rectangular, triangular, circular, etc., as long as they are convenient for processing, and can be flexibly selected according to requirements.

[0051] In a possible implementation manner, the cross-sections of both the connecting groove 4011 and the connecting post 4021 are circular. The diameter range of the opening of the connecting groove 4011 is 0.5 mm to 0.6 mm. The diameter of the cross-section at the opening of the connecting groove 4011 is at least 0.3 mm smaller than the diameter of the cross-section at the top surface of the connecting groove 4011. For the connecting groove 4011 and the connecting post 4021 in this form, it is convenient for manufacturing and can also ensure the fixing effect after melting connection.

[0052] In a possible implementation manner, the thickness range from the top surface of the connecting groove 4011 to the top surface of the sealing plate 401 is 0.2 mm to 1.5 mm. The height of the connecting post 4021 when not assembled is at least 0.25 mm larger than the depth of the connecting groove 4011, which can ensure that the strength of the sealing plate 401 meets the requirements and also ensure the strength of the melting connection.

[0053] In a possible implementation manner, a plurality of connecting grooves 4011 and connecting posts 4021 are arranged in pairs and at intervals along the length direction of the plugging member 4. The connecting grooves 4011 and the connecting posts 4021 are melted and connected at multiple positions along the length direction, which can ensure that the two components are closely fitted, meet the insulation performance between the tab 601 and the sealing plate 401, and improve the reliability of the battery.

[0054] In a possible implementation manner, the welding hole 102 sequentially includes a first hole section 1021 and a second hole section 1022 from top to bottom. The cross-sectional area of the second hole section 1022 is smaller than the cross-sectional area of the first hole section 1021. The connection surface between the first hole section 1021 and the second hole section 1022 forms a step surface 1023. The sealing plate 401 cooperates with the step surface 1023. The step surface 1023 can quickly and effectively position the vertical position of the sealing plate 401, and thus can improve the assembly accuracy and assembly speed of the plugging member 4.

[0055] Specifically, as Figure 4 shown, the area of the insulating plate 402 is smaller than the area of the sealing plate 401. Therefore, it can avoid the problem that when the sealing plate 401 cooperates with the step surface 1023, interference occurs between the step surface 1023 and the insulating plate 402, resulting in inability to install.

[0056] It can be understood that, as an alternative embodiment, the welding hole 102 can also be a through hole with a uniform diameter.

[0057] In a possible implementation, the top surface of the sealing plate 401 is flush with the top surface of the shell 1. The sealing plate 401 is not easy to interfere with other components after assembly, occupies less space and is lighter, and is not easy to separate from the shell 1. At the same time, this form of sealing plate 401 is more beautiful after assembly.

[0058] In a possible embodiment, the top surface of the pole lug connection portion 202 forms a connection surface 2021 for connecting to the pole lug 601. Since the connection surface 2021 connected to the pole lug 601 is located at the top of the pole lug connection portion 202, after the pole lug 601 is connected to the pole lug connection portion 202, not only is the structure more compact and occupies less space, but when the pole lug 601 pulls down the pole lug connection portion 202, one side of the pole column connection portion 201 will tend to curl up, so that the pole column 3 and the pole column connection portion 201 can fit more closely, reducing the risk of separation.

[0059] In the related art, the connecting sheet 2 and the pole ear 601 of the battery cell 6 are usually distributed up and down, and the bottom surface of the connecting sheet 2 is connected to the pole ear 601. In order to improve the connection reliability between the two, the pole ear 601 usually needs to be bent and fixed by welding to the bottom surface of the connecting sheet 2 through the outer wall. The pole ear 601 under this connection method needs to occupy a larger space, so that the top of the battery cell assembly has a cavity. In addition, the pole ear 601 will push up the connecting sheet 2, so that the pole connecting part 201 of the connecting sheet 2 will tend to move downward under the action of the lever principle, thereby making the pole connecting part 201 of the connecting sheet 2 easily separated from the pole 3, making the structural stability of the top of the battery cell assembly poor. The battery cell 6 cover plate assembly in this embodiment can reliably solve the defects of the above-mentioned structural form.

[0060] In a possible embodiment, the end of the pole lug connection portion 202 of the connecting plate 2 away from the pole connection portion 201 forms a through groove 2022 along the direction close to the pole connection portion 201, and the top surfaces of the pole lug connection portion 202 located on both sides of the through groove 2022 respectively form connecting surfaces 2021. This form of pole lug connection portion 202 is lighter in weight, and one pole lug connection portion 202 can be connected to two pole lugs 601 at the same time, and the structure is simple and reliable.

[0061] It can be understood that, as an alternative embodiment, the tab connection portion 202 can also be an integral structure without the through groove 2022 being provided thereon.

[0062] In a possible implementation, the battery cell housing assembly further includes an explosion-proof valve 5, and the explosion-proof valve 5 is disposed at the top of the housing 1 and is located between the two welding holes 102.

[0063] In a possible implementation, the battery cell housing assembly further includes a first insulating member 7 and a second insulating member 8. The first insulating member 7 is located between the connecting piece 2 and the top wall of the accommodating space 101, and the outer wall of the pole column 3 is in abutting fit with the inner wall and the upper peripheral edge of the connecting hole through the second insulating member 8.

[0064] According to an embodiment of the present invention, on the other hand, a battery cell assembly is provided, which includes: the above-mentioned battery cell housing assembly and a battery cell 6. The battery cell 6 is disposed in the accommodating space 101 of the battery cell housing assembly, and a tab 601 is provided at the top of the battery cell 6. The tab 601 includes a connecting section and a bent section. The connecting section is located on one side of the tab connecting portion 202 of the battery cell housing assembly, and the bent section is connected to the top of the connecting section and extends along the top surface of the tab connecting portion 202. The tab 601 is welded to the tab connecting portion 202.

[0065] Specifically, the tab 601 and the tab connecting portion 202 are welded by welding processes such as laser welding or ultrasonic welding to achieve electrical connection.

[0066] In a possible implementation, two tabs 601 are respectively provided at the positive and negative electrodes of the battery cell 6. One pair of the two tabs 601 are oppositely disposed on both sides of the corresponding tab connecting portion 202, and the bent sections of the two tabs 601 are welded to the same tab connecting portion 202. The structural form is simple and reliable. The two tabs 601 arranged in this way occupy less space after assembly, and the force on the tab connecting portion 202 is more uniform.

[0067] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery cell housing assembly, characterized in that Comprising: A housing having an accommodation space inside for installing an electric core. Two sets of assembly holes are provided on the top surface of the housing, and the assembly holes include connection holes and welding holes; A connection piece assembly located at the top of the accommodation space and including two connection pieces. The connection pieces are correspondingly arranged with the assembly holes. The connection piece includes a pole connection part and an ear connection part connected in sequence. The pole connection part is correspondingly arranged with the connection hole, and the ear connection part is correspondingly arranged with the welding hole. The ear connection part is used for connecting with the ear of the electric core; A pole assembly including two poles correspondingly penetrating through the connection holes. The poles are connected with the corresponding pole connection parts through the connection holes; A plugging piece matching the shape of the welding hole and used for plugging the welding hole. The plugging piece includes a sealing plate and an insulating plate arranged in sequence from top to bottom. The sealing plate is connected with the housing. A connection post is provided on one of the sealing plate and the insulating plate, and a connection groove is provided on the other. The sealing plate and the insulating plate are melt-connected through the connection post and the connection groove; A downward-opening connection groove is provided on the bottom surface of the sealing plate, and an upward-extending connection post is provided on the top surface of the insulating plate. The cross-sectional area of the connection groove gradually decreases from top to bottom; The cross-sections of the connection groove and the connection post are both circular. The diameter range of the opening of the connection groove is 0.5 mm to 0.6 mm, and / or the diameter of the cross-section of the opening of the connection groove is at least 0.3 mm smaller than the diameter of the cross-section of the top surface of the connection groove.

2. The cell housing assembly according to claim 1, wherein The thickness range from the top surface of the connection groove to the top surface of the sealing plate is 0.2 mm to 1.5 mm; and / or the height of the connection post when not assembled is at least 0.25 mm greater than the depth of the connection groove.

3. The cell housing assembly according to claim 1, wherein A plurality of the connection grooves and the connection posts are arranged in pairs and at intervals along the length direction of the plugging piece.

4. The cell housing assembly according to any one of claims 1 to 3, characterized in that The welding hole sequentially includes a first hole section and a second hole section from top to bottom. The cross-sectional area of the second hole section is smaller than that of the first hole section. The connection surface between the first hole section and the second hole section forms a stepped surface, and the sealing plate cooperates with the stepped surface.

5. The cell housing assembly according to any one of claims 1 to 3, characterized in that, The top surface of the ear connection part forms a connection surface for connecting with the ear.

6. The cell housing assembly according to claim 5, wherein, One end of the ear connection part of the connection piece away from the pole connection part forms a through groove along the direction close to the pole connection part. Connection surfaces are respectively formed on the top surfaces of the ear connection part on both sides of the through groove.

7. A battery cell assembly, characterized in that, Comprising: The electric core housing assembly according to any one of claims 1 to 6; An electric core arranged in the accommodation space of the electric core housing assembly and having an ear at the top. The ear includes a connection section and a bent section. The connection section is located on one side of the ear connection part of the electric core housing assembly. The bent section is connected to the top of the connection section and extends along the top surface of the ear connection part. The ear is welded to the ear connection part.

8. The cell assembly according to claim 7, wherein Two ears are respectively provided at the positive and negative electrodes of the electric core. One of the two ears is oppositely arranged on both sides of the corresponding ear connection part. The bent sections of the two ears are welded to the same ear connection part.

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