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 component and a battery cell component, the battery cell shell component comprises a shell, two groups of assembling holes are formed in the top surface of the shell; the connecting piece assembly comprises two connecting pieces, and the connecting pieces are arranged corresponding to the assembling holes; the pole component comprises two poles which are correspondingly arranged in the connecting holes in a penetrating manner; the plugging piece is used for plugging the welding hole; when the battery cell assembly is assembled, the tabs and the connecting pieces can be directly welded through the welding holes, so that the situation that the remaining parts can be assembled after the connecting pieces are independently welded and fixed with the tabs is avoided, and the shell, the connecting piece assembly and the pole assembly can be pre-assembled in advance; besides, the explosion-proof valve is arranged at the bottom of the shell, so that the space of the top of the shell is saved, the area of a welding hole is increased, the connecting sheet and the tab can be welded more effectively, and the connection reliability of the connecting sheet and the tab is ensured.

Description

Technical Field

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

[0002] With the rapid development of new energy technologies, power batteries, due to their excellent properties, have become increasingly widely used in various power tools and new energy vehicles. Safety during the use of power batteries is an important indicator. Power batteries must not only have high capacity but also good reliability. The cover plate assembly, as a key component of the power battery, serves to drain and seal the battery.

[0003] At present, the cell tabs of existing power batteries are mainly connected to the corresponding poles through connecting plates. The corresponding positions of the cell tabs and the connecting plates are connected by welding to ensure their current flow capacity. When manufacturing power batteries, independent battery cells, connecting plates, poles, cover plates and other components need to be sent to the assembly room before the components can be assembled in sequence. The entire assembly process takes a long time and many steps, is time-consuming and labor-intensive, and has the problem of low production efficiency. Utility Model Content

[0004] In view of this, the present invention provides a battery cell shell assembly and a battery cell assembly to solve the problem of low production efficiency in existing power battery assembly.

[0005] In the first aspect, the utility model provides a battery cell shell assembly, comprising: a shell having an accommodation space for installing a battery cell, the top surface of the shell being provided with two groups of assembly holes, the assembly holes including connection holes and welding holes; a connecting plate assembly, located at the top of the accommodation space and comprising two connecting plates, the connecting plates being arranged corresponding to the assembly holes, the connecting plates including a pole connecting portion and a lug connecting portion connected in sequence, the pole connecting portion being arranged corresponding to the connection hole, the lug connecting portion being arranged corresponding to the welding hole, the lug connecting portion being used to connect to the pole lug of the battery cell; a pole assembly, comprising two poles correspondingly arranged in the connection holes, the poles being connected to the corresponding pole connecting portions through the connection holes; a sealing piece, matching the shape of the welding hole, the sealing piece being used to seal the welding hole; an explosion-proof valve, arranged at the bottom of the shell.

[0006] Beneficial effect: A welding hole is opened on the top surface of the shell, and the pole tab and the connecting piece can be welded directly through the welding hole when the battery cell assembly is assembled. The simple structure changes the assembly order of the components of the battery cell assembly, avoiding the situation that the connecting piece needs to be welded and fixed to the pole tab separately before the remaining components can be assembled, so that the shell, connecting piece assembly and pole column assembly can be pre-assembled in advance, which greatly reduces the assembly steps when the battery cell assembly is assembled. In addition, the explosion-proof valve is set at the bottom of the shell, which saves space on the top of the shell, thereby increasing the area of the welding hole, so that the connecting piece and the pole tab can be welded more effectively, ensuring the welding area and connection reliability of the connecting piece and the pole tab, and effectively solving the problem of low production efficiency of existing power battery assembly.

[0007] In an optional embodiment, the top surface of the tab connecting portion forms a connection surface for connecting to the tab.

[0008] Beneficial effect: Since the connection surface connected to the tab is located at the top of the tab connection part, after the tabs are connected, not only is the structure more compact and occupies less space, but when the tab pulls down the tab connection part, one side of the pole connection part will tend to curl upward, so that the poles and the pole connection parts can fit more closely and reduce the risk of separation.

[0009] In an optional embodiment, a through slot is formed at one end of the tab connection portion of the connecting piece 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 slot form connection surfaces respectively.

[0010] Beneficial effects: This type of tab connection portion is lighter in weight, one tab connection portion can be connected to two tabs at the same time, and the structure is simple and reliable.

[0011] In an optional embodiment, a liquid injection hole is further provided on the top of the shell.

[0012] Beneficial effect: The injection hole and the explosion-proof valve are located at two end faces, which can effectively prevent the electrolyte from contaminating the explosion-proof valve during injection and effectively improve the safety performance of the battery.

[0013] In an optional embodiment, the blocking member includes a sealing plate and an insulating plate, the insulating plate is arranged at the bottom of the sealing plate, and the sealing plate is assembled and connected to the welding hole.

[0014] Beneficial effects: The structure is simple and reliable, and the insulating plate can effectively improve the insulation reliability between the sealing plate and internal components.

[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 vertical position of the sealing plate, thereby improving the assembly accuracy and speed of the sealing piece.

[0017] In an optional embodiment, the top surface of the sealing plate is flush with the top surface of the housing.

[0018] Beneficial effects: The sealing plate is not easily interfered with by other components after assembly, occupies less space and is lighter in weight, and is not easily separated from the housing.

[0019] In an optional embodiment, one of the sealing plate and the insulating plate is provided with a connecting column, and the other of the sealing plate and the insulating plate is provided with a connecting groove for inserting the connecting column.

[0020] Beneficial effects: This type of sealing plate and insulating plate has a larger contact area, which can effectively improve the strength and stability of the two parts after connection, and greatly reduce the possibility of separation of the sealing plate and insulating plate. In addition, the combination of connecting columns and connecting grooves can help the sealing plate and insulating plate to be quickly and effectively positioned during installation, thereby improving assembly speed.

[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 tab on the top, the pole tab includes a connecting section and a bending section, the connecting section is located on one side of the pole tab 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 tab connecting part, and the pole tabs are welded to the pole tab connecting parts.

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

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

[0024] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 This is a three-dimensional schematic diagram of a battery cell housing assembly according to an embodiment of the present utility model;

[0026] Figure 2 for Figure 1 A top view of the cell housing assembly is shown;

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

[0028] Figure 4 for Figure 3 An enlarged schematic diagram of point B of the cell housing assembly is shown;

[0029] Figure 5 for Figure 1 A three-dimensional schematic diagram of the explosion-proof valve at the bottom of the battery cell housing assembly is shown;

[0030] Figure 6 for Figure 1 The three-dimensional schematic diagram of the cell housing assembly after assembly without the plugging piece installed is shown;

[0031] Figure 7 for Figure 6 The three-dimensional schematic diagram of the battery cell housing assembly when the tab is not bent during assembly is shown;

[0032] Figure 8 for Figure 7 The three-dimensional schematic diagram of the battery cell housing assembly shown is shown when the housing is not shown and the tabs are not bent during assembly.

[0033] Description of reference numerals:

[0034] 1. Shell; 101. Accommodation space; 102. Welding hole; 1021. First hole section; 1022. Second hole section; 1023. Step surface; 103. Liquid injection hole;

[0035] 2. Connecting piece; 201. Pole connecting portion; 202. Pole ear connecting portion; 2021. Connecting surface; 2022. Through slot;

[0036] 3. Pole;

[0037] 4. Blocking piece; 401. Sealing plate; 4011. Connecting groove; 402. Insulating plate; 4021. Connecting column;

[0038] 5. Explosion-proof valve;

[0039] 6. Battery cell; 601. Tab; 7. First insulating member; 8. Second insulating member. DETAILED DESCRIPTION

[0040] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0041] The following combination Figures 1 to 8 , describing the embodiments of the present utility model.

[0042] According to an embodiment of the present invention, on the one hand, a battery cell housing assembly is provided, comprising: a housing 1, a connecting piece assembly, a pole assembly, a blocking piece 4 and an explosion-proof valve 5, wherein the housing 1 has an accommodating space 101 for installing a battery cell 6, and the top surface of the housing 1 is provided with two sets of assembly holes, the assembly holes including connection holes and welding holes 102, the connecting piece 2 assembly is located at the top of the accommodating space 101 and includes two connecting pieces 2, the connecting pieces 2 are arranged corresponding to the assembly holes, and the connecting pieces 2 include pole connection pieces connected in sequence. Part 201 and the pole lug connecting part 202, the pole connecting part 201 is arranged corresponding to the connecting hole, the pole lug connecting part 202 is arranged corresponding to the welding hole 102, the pole lug connecting part 202 is used to connect with the pole lug 601 of the battery cell 6, the pole 3 assembly includes two poles 3 correspondingly arranged in the connecting hole, the pole 3 is connected to the corresponding pole connecting part 201 through the connecting hole, the sealing part 4 matches the shape of the welding hole 102, the sealing part 4 is used to seal the welding hole 102, and the explosion-proof valve 5 is arranged at the bottom of the shell 1.

[0043] The battery cell shell assembly of this embodiment is applied, and a welding hole 102 is opened on the top surface of the shell 1. When the battery cell assembly is assembled, the pole tab 601 and the connecting piece 2 can be directly welded through the welding hole 102. The simple structure changes the assembly order of the components of the battery cell assembly, avoiding the situation where the connecting piece 2 needs to be welded and fixed to the pole tab 601 separately before the remaining components can be assembled, so that the shell 1, the connecting piece 2 assembly and the pole post 3 assembly can be pre-assembled in advance, which greatly reduces the assembly steps when the battery cell assembly is assembled. In addition, the explosion-proof valve 5 is arranged at the bottom of the shell 1, which saves space on the top of the shell 1, thereby increasing the area of the welding hole 102, so that the connecting piece 2 and the pole tab 601 can be welded more effectively, ensuring the welding area and connection reliability of the connecting piece 2 and the pole tab 601, and effectively solving the problem of low production efficiency of existing power battery assembly.

[0044] Among them, it should be noted that the top refers to Figure 3 The arrow in the middle points to the "up" side, and the bottom refers to the Figure 3 The side pointed by the arrow in the "down" direction.

[0045] In the related art, in a battery of a certain capacity, the specifications of the explosion-proof valve 5 are usually fixed. If the explosion-proof valve 5 is arranged on the side of the shell 1 where the pole 3 is located, it will occupy the space on the shell 1 on that side. In order to avoid the explosion-proof valve 5 and avoid affecting the normal operation of the explosion-proof valve 5, the welding hole 102 can only be located in a preset smaller range. This arrangement of the explosion-proof valve 5 will affect the specifications of the opening of the welding hole 102, so that the welding process of the connecting piece 2 and the pole ear 601 can be carried out at the smaller welding hole 102, thereby also affecting the welding area of the connecting piece 2 and the pole ear 601. The battery cell shell assembly of this embodiment can reliably solve the defects of the above-mentioned structural form.

[0046] In one possible embodiment, the top surface of the pole tab connection portion 202 forms a connection surface 2021 for connecting to the pole tab 601. Since the connection surface 2021 connected to the pole tab 601 is located at the top of the pole tab connection portion 202, after the pole tab 601 is connected to the pole tab connection portion 202, not only is the structure more compact and occupies less space, but when the pole tab 601 pulls down the pole tab connection portion 202, one side of the pole column connection portion 201 will tend to curl upward, so that the pole column 3 and the pole column connection portion 201 can fit more closely, reducing the risk of separation.

[0047] In the related art, the connecting piece 2 and the pole ear 601 of the battery cell 6 are usually distributed up and down, and the bottom surface of the connecting piece 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 piece 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 piece 2, so that the pole connecting part 201 of the connecting piece 2 will have a tendency to move downward under the action of the lever principle, thereby making the pole connecting part 201 of the connecting piece 2 easy to separate from the pole 3, making the structural stability of the top of the battery cell assembly poor. The battery cell shell assembly in this embodiment can reliably solve the defects of the above-mentioned structural form.

[0048] In one possible embodiment, a through groove 2022 is formed at one end of the pole connecting portion 202 of the connecting plate 2 away from the pole connecting portion 201 along a direction close to the pole connecting portion 201, and the top surfaces of the pole connecting portion 202 on both sides of the through groove 2022 respectively form connecting surfaces 2021. This form of pole connecting portion 202 is lighter in weight, and one pole connecting portion 202 can be connected to two pole ears 601 at the same time, and the structure is simple and reliable.

[0049] 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 provided thereon.

[0050] In a possible embodiment, a liquid injection hole 103 is further provided on the top of the shell 1. The liquid injection hole 103 and the explosion-proof valve 5 are located at two end faces, which can effectively prevent the electrolyte from contaminating the explosion-proof valve 5 during liquid injection, and can effectively improve the safety performance of the battery.

[0051] Specifically, there is no strict limitation on the structural form of the liquid injection hole 103 , and reference may be made to the existing liquid injection hole 103 form, which will not be described in detail here.

[0052] In one possible embodiment, the sealing member 4 includes a sealing plate 401 and an insulating plate 402. The insulating plate 402 is arranged at the bottom of the sealing plate 401. The sealing plate 401 is assembled and connected to the welding hole 102. The structure is simple and reliable. The insulating plate 402 can effectively improve the insulation reliability between the sealing plate 401 and internal components.

[0053] There is no limitation on the connection method between the blocking member 4 and the housing 1 , and the connection may be welding, bonding, or connection via fastening components, etc., and can be flexibly selected according to needs.

[0054] In a possible embodiment, the welding hole 102 includes a first hole segment 1021 and a second hole segment 1022 from top to bottom, the cross-sectional area of the second hole segment 1022 is smaller than the cross-sectional area of the first hole segment 1021, and the connecting surface of the first hole segment 1021 and the second hole segment 1022 forms a step surface 1023, and the sealing plate 401 cooperates with the step surface 1023. The step surface 1023 can quickly and effectively position the sealing plate 401 along the vertical position, thereby improving the assembly accuracy and assembly speed of the sealing member 4.

[0055] Specifically, if Figure 4 As shown, the area of the insulating plate 402 is smaller than that of the sealing plate 401 , thereby avoiding the problem of interference between the step surface 1023 and the insulating plate 402 when the sealing plate 401 is matched with the step surface 1023 , resulting in installation failure.

[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 one possible embodiment, the top surface of the sealing plate 401 is flush with the top surface of the shell 1. After assembly, the sealing plate 401 is not easily interfered with by other components, occupies less space and is lighter in weight, and is not easily separated from the shell 1. At the same time, this form of sealing plate 401 is also more beautiful after assembly.

[0058] In one possible embodiment, a connecting column 4021 is provided on one of the sealing plate 401 and the insulating plate 402, and a connecting groove 4011 for inserting the connecting column 4021 is provided on the other of the sealing plate 401 and the insulating plate 402. This form of sealing plate 401 and insulating plate 402 has a larger contact area, which can effectively improve the strength and stability of the two components after connection, and can greatly reduce the possibility of separation of the sealing plate 401 and the insulating plate 402. In addition, the cooperation between the connecting column 4021 and the connecting groove 4011 can help the sealing plate 401 and the insulating plate 402 to be quickly and effectively positioned during installation, thereby improving the assembly speed.

[0059] Specifically, there is no specific limitation on the number and arrangement of the connecting pillars 4021 and the connecting grooves 4011 . There can be one or multiple connecting pillars 4021 and 4011 arranged in an array, and the number can be flexibly selected according to the needs.

[0060] In a possible embodiment, 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 3 is abutted against the inner wall of the connecting hole and the upper end periphery through the second insulating member 8.

[0061] 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 shell assembly and a battery cell 6, the battery cell 6 is arranged in the accommodating space 101 of the battery cell shell assembly and a pole ear 601 is arranged on the top, the pole ear 601 includes a connecting section and a bending section, the connecting section is located on one side of the pole ear connecting part 202 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 202, and the pole ear 601 is welded to the pole ear connecting part 202.

[0062] Specifically, the tab 601 and the tab connection portion 202 are electrically connected by welding using a welding process such as laser welding or ultrasonic welding.

[0063] In one possible embodiment, the positive pole and the negative pole of the battery cell 6 are respectively provided with two pole tabs 601, and the two pole tabs 601 of one pole are relatively arranged on both sides of the corresponding pole tab connection part 202, and the bending sections of the two pole tabs 601 are welded to the same pole tab connection part 202. The structural form is simple and reliable. The two pole tabs 601 arranged in this way occupy less space after assembly, and the force on the pole tab connection part 202 is also more uniform.

[0064] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A battery cell housing assembly, characterized in that: include: A housing having an interior space for mounting the battery cell, wherein the top surface of the housing is provided with two sets of assembly holes, including connection holes and welding holes; A connecting piece assembly is located at the top of the accommodating space and includes two connecting pieces, the connecting pieces are arranged corresponding to the assembly holes, the connecting pieces include a pole connecting portion and a tab connecting portion connected in sequence, the pole connecting portion is arranged corresponding to the connection hole, the tab connecting portion is arranged corresponding to the welding hole, and the tab connecting portion is used to connect to the tab of the battery cell; A pole assembly, comprising two poles correspondingly inserted into the connection holes, wherein the poles are connected to the corresponding pole connecting portions through the connection holes; a blocking piece, matching the shape of the welding hole, and used to block the welding hole; An explosion-proof valve is arranged at the bottom of the shell.

2. The battery cell housing assembly according to claim 1, characterized in that: The top surface of the tab connecting portion forms a connection surface for connecting with the tab.

3. The battery cell housing assembly according to claim 2, characterized in that: An end of the tab connection portion of the connecting piece away from the pole connection portion forms a through slot along a direction close to the pole connection portion, and top surfaces of the tab connection portion located on both sides of the through slot form connection surfaces respectively.

4. The battery cell housing assembly according to any one of claims 1 to 3, characterized in that: The top of the shell is also provided with a liquid injection hole.

5. The battery cell housing assembly according to any one of claims 1 to 3, characterized in that: The blocking piece includes a sealing plate and an insulating plate. The insulating plate is arranged at the bottom of the sealing plate, and the sealing plate is assembled and connected with the welding hole.

6. The battery cell housing assembly according to claim 5, characterized in that: 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.

7. The battery cell housing assembly according to claim 6, characterized in that: The top surface of the sealing plate is flush with the top surface of the housing.

8. The battery cell housing assembly according to claim 5, characterized in that: One of the sealing plate and the insulating plate is provided with a connecting column, and the other of the sealing plate and the insulating plate is provided with a connecting groove for inserting the connecting column.

9. A battery cell assembly, characterized in that: include: The battery cell housing assembly according to any one of claims 1 to 8; A battery cell is arranged in the accommodating space of the battery cell shell assembly and is provided with a pole tab on the top. The pole tab includes a connecting section and a bending section. The connecting section is located on one side of the pole tab connecting portion 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 tab connecting portion. The pole tab is welded to the pole tab connecting portion.

10. The battery core assembly according to claim 9, characterized in that: The positive electrode and the negative electrode of the battery cell are respectively provided with two tabs, and the two tabs of one pole are relatively arranged on both sides of the corresponding tab connection portion, and the bent sections of the two tabs are welded to the same tab connection portion.

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