Chip assembly, battery pack and electric equipment

Abstract

The utility model relates to a chip assembly, a battery pack and electric equipment, and relates to the technical field of power batteries. The bar assembly is connected to the integrated busbar, and the bar assembly comprises a bar structure and a hot melting column. At least one connecting hole is formed in the bar structure, and the connecting hole penetrates through the bar structure. The hot melting column passes through the connecting hole and is fixedly connected to the integrated busbar. Wherein the connecting hole comprises a first hole section and a second hole section, the second hole section is located on the side, away from the integrated busbar, of the first hole section, the size of the second hole section is at least partially larger than that of the first hole section, and after the hot melting column is hot-melted, the connecting hole is completely filled with the hot melting column. According to the chip assembly provided by the invention, the problem that the contact heat dissipation area between the chip structure and the heat dissipation assembly is affected by a pie-shaped feature structure formed by the hot melting columns when the chip structure is connected through the hot melting columns can be solved.

Description

Technical Field

[0001] This application relates to the technical field of power batteries, and specifically, to a bus bar assembly, a battery pack, and an electrical device. Background Art

[0002] The structure of a power battery mainly includes a box body and multiple groups of battery cell modules inside. Among them, adjacent single battery cells and adjacent battery cell modules need to be connected and conduct electricity through a bus bar structure. The pole of a battery cell is connected and conducts electricity with the bus bar structure. At the same time, an integrated bus bar (Cells Contact System, CCS) is also provided between the bus bar structure and the battery cell, and the integrated bus bar and the bus bar structure also need to be connected and fixed. In addition, a heat dissipation structure needs to be provided to cool the bus bar structure. Usually, a corrugated pipe is arranged on the top of the bus bar structure to dissipate heat from it. At this time, in order to ensure the heat dissipation effect, it is necessary to ensure the flatness of the upper and lower heat dissipation surfaces between the bus bar structure and the corrugated pipe to ensure the maximum contact heat dissipation area.

[0003] In the prior art, the integrated bus bar and the bus bar structure are usually connected by a hot melt column. One end of the hot melt column is fixed to the integrated bus bar, and the other end passes through the bus bar structure and protrudes from the bus bar structure. The formed disc-shaped feature after melting at the end protrudes from the upper surface of the bus bar structure to achieve a firm connection with the bus bar structure.

[0004] However, when the above connection method is used, the formed disc-shaped feature structure at the end of the hot melt column will affect the flatness of the upper surface of the bus bar structure, and further affect the contact heat dissipation area between the bus bar structure and the corrugated pipe, thus affecting the heat dissipation effect. At the same time, the disc-shaped feature structure protruding from the upper surface of the bus bar structure will also affect the size of the power battery in the height direction, resulting in a decrease in the energy density of the power battery. Utility Model Content

[0005] The purpose of this application is to provide a bus bar assembly, a battery pack, and an electrical device, which can solve the problem that the formed disc-shaped feature structure of the hot melt column affects the contact heat dissipation area between the bus bar assembly and the heat dissipation component when the bus bar assembly is connected by the hot melt column.

[0006] To achieve the above purpose, according to the first aspect of this application, an embodiment of this application provides a bus bar assembly. The bus bar assembly is connected to an integrated bus bar, and the bus bar assembly includes a bus bar structure and a hot melt column. At least one connection hole is opened on the bus bar structure, and the connection hole penetrates the bus bar structure. The hot melt column is inserted into the connection hole, and the hot melt column is fixedly connected to the integrated bus bar. Wherein, the connection hole includes a first hole section and a second hole section. The second hole section is located on the side of the first hole section away from the integrated bus bar, and the size of the second hole section is at least partially larger than the size of the first hole section. After the hot melt column is melted, the hot melt column completely fills the connection hole.

[0007] Based on the above-mentioned embodiments of the present application, when the bar structure and the integrated busbar are connected and fixed by the hot melt column, the connection hole is divided into a first hole segment and a second hole segment, and the size of the second hole segment is larger than the first hole segment, thereby increasing the volume of the connection hole, and the melted hot melt column is completely filled in the connection hole after the hot melt column is hot-melted, so as to avoid the formation of a pancake-shaped fixed structure protruding from the bar structure after the hot melt column solidifies again, thereby reducing the impact on the flatness of the upper surface of the bar structure. When the heat dissipation structure is set on the upper surface of the bar structure, it can ensure that there is sufficient contact and heat dissipation area between the bar structure and the heat dissipation structure, thereby ensuring the heat dissipation efficiency. At the same time, the above-mentioned setting can also reduce the impact on the size of the battery in the height direction, thereby reducing the impact on the battery energy density. Further, since the size of the second hole segment is larger than the size of the first hole segment, that is, the first hole segment and the second hole segment cooperate to form a countersunk hole structure, the pancake-shaped fixed structure formed after the hot melt column solidifies again can be clamped with the countersunk hole structure, achieving an effect similar to riveting, thereby fixing the integrated busbar and the bar structure.

[0008] In some embodiments, before the hot melt column is melted, the end of the hot melt column protrudes from the tab structure. The volume of the hot melt column in the second hole segment is V1, the volume of the hot melt column protruding from the tab structure is V2, the volume of the second hole segment is V3, and V1+V2≤V3.

[0009] Based on the above-mentioned embodiments of the present application, through the above-mentioned arrangement, the portion of the hot melt column protruding from the bar structure before hot melting and the portion originally in the second hole segment can be completely accommodated in the second hole segment after hot melting, thereby avoiding the pancake-shaped fixed structure formed after the hot melt column solidifies again protruding from the bar structure, thereby affecting the contact and heat dissipation area between the bar structure and the heat dissipation structure, and avoiding affecting the height dimension of the battery.

[0010] In some embodiments, the second hole segment is configured as a funnel-shaped structure, the expansion end of the funnel-shaped structure is configured at an end away from the first hole segment, and the contraction end of the funnel-shaped structure is connected to the first hole segment.

[0011] Based on the above-mentioned embodiments of the present application, by setting the second hole segment as a funnel-shaped structure, on the one hand, the funnel-shaped structure increases the volume of the second hole segment compared to the original columnar structure, so that the second hole segment can fully accommodate the hot melt column after hot melting. On the other hand, the second hole segment of the funnel-shaped structure cooperates with the first hole segment to form a structure similar to a conical countersunk hole, which can be engaged with the hot melt column after it solidifies again, thereby fixing the bar structure and the integrated busbar. Furthermore, by setting the second hole segment as a funnel-shaped structure, it is convenient to collect the hot melt column after hot melting, thereby reducing the possibility that the hot melt column flows out of the connecting hole after hot melting and solidifies again on the surface of the bar structure.

[0012] In some embodiments, the first hole section is a cylindrical hole, the aperture of the second hole section is at least partially larger than that of the first hole section, the diameter of the first hole section is φ1, and 2 mm ≤ φ1 ≤ 5 mm.

[0013] Based on the above embodiments of the present application, when the first hole section is set as a cylindrical hole, by restricting the diameter of the first hole section, if the diameter of the first hole section is too large, it may affect the strength of the bar structure itself, and if the diameter of the first hole section is too small, it will affect the diameter of the hot melt column, thereby affecting the connection strength between the bar structure and the integrated busbar. Therefore, by restricting the diameter of the first hole section within a certain range, while ensuring the connection strength between the bar structure and the integrated busbar, the influence on the strength of the bar structure is reduced.

[0014] In some embodiments, the second hole section is set as a frustum-shaped funnel structure, the maximum diameter of the second hole section is φ2, and φ2 ≤ 7 mm.

[0015] Based on the above embodiments of the present application, when the second hole section is set as a frustum-shaped funnel structure, by restricting the diameter of the second hole section, it is avoided that the too large aperture of the second hole section affects the strength and connection effect of the bar structure.

[0016] In some embodiments, the size that the hot melt column protrudes from the bar structure before hot melting is L1, and L1 ≥ 0.8 mm.

[0017] Based on the above embodiments of the present application, by restricting the size that the hot melt column protrudes from the bar structure before hot melting, when the size that the hot melt column protrudes from the bar structure is insufficient, it will cause the volume of the disc-shaped fixing structure formed after the hot melt column solidifies again to be small, and finally may lead to a low connection strength between the bar structure and the integrated busbar.

[0018] In some embodiments, at least two connection holes are provided on the bar structure, and a hot melt column is cooperatively arranged in each connection hole.

[0019] Based on the above embodiments of the present application, when the bar structure is fixed only by a single hot melt column, the bar structure can rotate around the hot melt column in the horizontal direction, while by setting two hot melt columns, the position of the bar structure relative to the integrated busbar in the horizontal direction can be limited, making the connection between the two more stable.

[0020] In some embodiments, the hot melt column is integrally arranged with the integrated busbar. Alternatively, the hot melt column is separately arranged from the integrated busbar and is connected by hot melting.

[0021] Based on the above embodiments of the present application, one end of the hot melt column needs to be fixedly connected to the integrated busbar. In actual production and processing, the hot melt column and the integrated busbar are integrally formed by injection molding or other methods, which not only improves production efficiency but also eliminates the step of fixing the hot melt column to the integrated busbar during subsequent assembly, thus simplifying the assembly process. Or, the hot melt column and the integrated busbar are separately provided and then connected by hot melting. Specifically, a suitable setting method can be selected according to production and processing requirements.

[0022] According to the second aspect of the present application, a battery pack is provided. The battery pack includes a battery cell and the above-mentioned tab assembly. The tab assembly is connected to the output end of the battery cell, and the integrated busbar is located between the tab assembly and the battery cell.

[0023] Based on the above embodiments of the present application, when the battery pack provided by the present application is in use, the tab assembly is connected to the pole column of the battery cell for input and output of current, while the integrated busbar is arranged between the tab assembly and the battery cell, and the integrated busbar is connected to the battery cell for monitoring and managing the battery pack. When the above tab assembly is applied to the battery pack, through the above setting, while ensuring the stable connection between the tab structure and the integrated busbar, the influence of the hot melt column on the height direction of the battery pack is reduced, thereby improving the energy density of the battery pack.

[0024] According to the third aspect of the present application, an electrical device is provided. The electrical device includes a housing and the above-mentioned battery pack, and the battery pack is arranged inside the housing.

[0025] Based on the above embodiments of the present application, the electrical device provided by the present application includes the above-mentioned battery pack, so it also has the above-mentioned beneficial effects. To avoid repetition, it will not be elaborated here.

[0026] Other features and advantages of the present application will be described in detail in the subsequent specific implementation part. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the following specific implementation, they are used to explain the present application but do not constitute a limitation to the present application. In the drawings:

[0028] Figure 1 is a schematic plan view of the integrated busbar and the tab structure in the tab assembly provided by the embodiment of the present application.

[0029] Figure 2 is a schematic plan view of the tab structure in the tab assembly provided by the embodiment of the present application.

[0030] Figure 3 is a schematic sectional view of the tab structure in the tab assembly provided by the embodiment of the present application.

[0031] Figure 4 It is a schematic cross-sectional view of the bar structure and the hot-melt column before hot melting in the bar component provided by the embodiment of the present application.

[0032] Figure 5 It is a schematic cross-sectional view of the bar structure and the hot-melt column after hot melting in the bar component provided by the embodiment of the present application.

[0033] Description of the reference numerals

[0034] 1. Integrated busbar; 2. Bar structure; 3. Connection hole; 31. First hole section; 32. Second hole section; 321. Expansion end; 322. Contraction end; 4. Hot-melt column. Detailed implementation manners

[0035] In order to make the objectives, technical solutions and advantages of the present application more clear and understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0036] To make the objectives, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Generally, the components of the embodiments of the present application described and illustrated in the accompanying drawings herein can be arranged and designed in various different configurations.

[0037] Therefore, the detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0038] It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0039] In the description of the present application, it should be noted that unless otherwise stated, the orientation or positional relationship indicated by terms such as "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of describing the present application 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 a limitation of the present application. In addition, terms such as "first", "second", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0040] In the description of the present application, it should also be noted that, unless otherwise clearly specified and defined, the terms "arrangement" 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 directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0041] The structure of the power battery mainly includes a box body and multiple groups of battery cell modules inside. Among them, adjacent single battery cells and adjacent battery cell modules need to be connected and conduct electricity through bus bars. The pole columns of the battery cells are connected and conduct electricity with the bus bars. At the same time, an integrated bus bar (Cells Contact System, CCS) module is also arranged between the bus bars and the battery cells. The pole columns on the battery cells pass through the integrated bus bar module and are welded and conduct electricity with the bus bars. The integrated bus bar module and the bus bars also need to be connected and fixed. In addition, a heat dissipation structure needs to be arranged to cool the bus bar structure. Usually, a finned tube is arranged on the top of the bus bar structure to dissipate heat from it. When specifically arranged, the finned tube structure and the bus bar structure are fixedly connected by gluing, and at the same time, insulation treatment needs to be carried out between the two, such as arranging an insulating film for insulation isolation. At this time, in order to ensure the heat dissipation effect, it is necessary to ensure the flatness of the upper and lower heat dissipation surfaces between the bus bar structure and the finned tube to ensure the maximum contact heat dissipation area.

[0042] In the prior art, the integrated bus bar and the bus bar structure are usually connected by hot melt posts. One end of the hot melt post is fixed to the integrated bus bar, and the other end passes through the bus bar structure and protrudes from the bus bar structure. The cake-shaped feature formed after the end is melted by heat protrudes from the upper surface of the bus bar structure to achieve a firm connection with the bus bar structure.

[0043] However, when the above connection method is used, the cake-shaped feature structure formed at the end of the hot melt post will affect the flatness of the upper surface of the bus bar structure, and further affect the contact heat dissipation area between the bus bar structure and the finned tube, thus affecting the heat dissipation effect. At the same time, the cake-shaped feature structure protruding from the upper surface of the bus bar structure will also affect the size of the power battery in the height direction, resulting in a reduction in the energy density of the power battery.

[0044] To solve the above problems in the prior art, refer to Figures 1 to 3As shown, according to the first aspect of the present application, an embodiment of the present application provides a tab component. The tab component is connected to the integrated busbar 1, and the tab component includes a tab structure 2 and a hot melt column 4. At least one connection hole 3 is formed in the tab structure 2, and the connection hole 3 penetrates the tab structure 2. The hot melt column 4 is inserted into the connection hole 3, and the hot melt column 4 is fixedly connected to the integrated busbar 1. Wherein, the connection hole 3 includes a first hole section 31 and a second hole section 32. The second hole section 32 is located on the side of the first hole section 31 away from the integrated busbar 1, and the size of the second hole section 32 is at least partially larger than the size of the first hole section 31. After the hot melt column 4 is melted, the hot melt column 4 completely fills the connection hole 3.

[0045] Based on the above embodiment of the present application, when the tab structure 2 and the integrated busbar 1 are connected and fixed through the hot melt column 4, by dividing the connection hole 3 into a first hole section 31 and a second hole section 32, and the size of the second hole section 32 is larger than that of the first hole section 31, the volume of the connection hole 3 is increased. After the hot melt column 4 is melted, the melted hot melt column 4 completely fills the connection hole 3, avoiding the formation of a disc-shaped fixed structure protruding from the tab structure 2 after the hot melt column 4 solidifies again, thereby reducing the impact on the flatness of the upper surface of the tab structure 2. When a heat dissipation structure is provided on the upper surface of the tab structure 2, it can ensure that there is sufficient contact heat dissipation area between the tab structure 2 and the heat dissipation structure, ensuring the heat dissipation efficiency.

[0046] At the same time, through the above settings, the impact on the size of the battery in the height direction can also be reduced, and further the impact on the energy density of the battery can be reduced.

[0047] At the same time, since the size of the second hole section 32 is larger than that of the first hole section 31, that is, the first hole section 31 and the second hole section 32 cooperate to form a counterbore structure, the disc-shaped fixed structure formed after the hot melt column 4 solidifies again can be clamped with the counterbore structure, achieving an effect similar to riveting, thereby fixing the integrated busbar 1 and the tab structure 2.

[0048] In addition, it should also be noted that in the present application, the heat dissipation structure provided on the tab structure 2 is not limited to the mouth organ tube structure. For example, a liquid cooling plate heat dissipation structure can also be provided, etc. Specifically, a suitable structure can be selected according to actual heat dissipation requirements, etc. The present application does not make specific limitations in this regard.

[0049] In some embodiments of the present application, before the hot melt column 4 is melted, the end of the hot melt column 4 protrudes from the tab structure 2. The volume of the hot melt column 4 located in the second hole section 32 is V1, the volume of the hot melt column 4 protruding from the tab structure 2 is V2, and the volume of the second hole section 32 is V3, and V1 + V2 ≤ V3.

[0050] Based on the above embodiments of the present application, through the above settings, the part of the hot melt post 4 protruding from the bar structure 2 before hot melting and the part originally in the second hole section 32 can be completely accommodated in the second hole section 32 after hot melting, so as to prevent the disc-shaped fixing structure formed after the hot melt post 4 solidifies again from protruding from the bar structure 2 and affecting the size of the battery in the height direction.

[0051] Specifically, when V1 + V2 = V3, that is, the volume of the hot melt post 4 protruding from the bar structure 2 before hot melting plus the volume of the hot melt post 4 itself located in the second hole section 32 is exactly equal to the volume of the second hole section 32. Therefore, after the hot melt post 4 is completely melted and solidifies again, the hot melt post 4 just fills the second hole section 32.

[0052] When V1 + V2 < V3, there will still be a certain space left in the second hole section 32 after the hot melt post 4 solidifies again and fills the second hole section 32. Considering the processing error of the hot melt post 4 in the production and processing process and the possible factors such as thermal expansion that the hot melt post 4 may face during the use of the bar assembly, V1 + V2 < V3 can be set in the specific setting, that is, a certain margin space is left in the second hole section 32.

[0053] In the present application, the specific structure of the second hole section 32 can be selected according to the actual situation in a suitable setting manner.

[0054] Reference Figure 3 As shown in

[0055] Based on the above embodiments of the present application, by setting the second hole section 32 as a funnel-shaped structure, on the one hand, the funnel-shaped structure increases the volume of the second hole section 32 compared with the original columnar structure, so that the second hole section 32 can completely accommodate the hot melt post 4 after hot melting. On the other hand, the second hole section 32 of the funnel-shaped structure cooperates with the first hole section 31 to form a structure similar to a tapered counterbore, which can cooperate with the hot melt post 4 after it solidifies again to form a disc-shaped fixing structure for clamping, realizing the fixation of the bar structure 2 and the integrated busbar 1. Further, by setting the second hole section 32 as a funnel-shaped structure, it is convenient to collect the current of the hot melt post 4 after hot melting, reducing the possibility that the hot melt post 4 flows out of the connection hole 3 and solidifies again on the surface of the bar structure 2 after hot melting.

[0056] Reference Figure 4 and Figure 5As shown in the figure, the structures of the second hole section 32 and the hot melt post 4 before and after hot melting are shown in the attached drawings of the present application. Before the hot melt post 4 is hot melted, the end of the hot melt post 4 protrudes from the tab structure 2. Subsequently, the end of the hot melt post 4 is hot melted and flows into the second hole section 32 of the funnel-shaped structure. Subsequently, the hot melt post 4 solidifies again and forms a structure similar to a conical rivet, realizing the connection between the tab structure 2 and the integrated bus bar 1.

[0057] In some other embodiments of the present application, the structure of the second hole section 32 can also be set as a cylindrical structure, such as a cylindrical structure or a quadrangular prism structure. At this time, the cross-sectional area of the cylindrical second hole section 32 is larger than that of the first hole section 31, and the cross-section of the second hole section 32 completely covers the cross-section of the first hole section 31, so that the volume of the second hole section 32 can be increased, and at the same time, a stepped structure can be formed at the connection position between the first hole section 31 and the second hole section 32, which is convenient for snap-fitting and fixing with the disc-shaped fixing structure formed after the hot melt post 4 solidifies again. Specifically, a suitable setting method can be selected according to factors such as the processing technology of the connection hole 3, and the present application does not make specific restrictions on this.

[0058] Furthermore, in the present application, the volume of the second hole section 32 can be controlled by adjusting the size of the second hole section 32 in the opening direction and adjusting the cross-sectional area of the second hole section 32.

[0059] Specifically, regarding the size of the second hole section 32 in the opening direction, in the present application, when the thickness of the tab structure 2 is fixed, the ratio of the sizes of the first hole section 31 and the second hole section 32 in the opening direction can be set within any suitable range.

[0060] In an exemplary embodiment provided by the present application, the ratio of the sizes of the first hole section 31 and the second hole section 32 in the opening direction is one to one, that is, when the connection hole 3 completely penetrates the tab structure 2, the first hole section 31 and the second hole section 32 respectively account for half of the thickness of the tab structure 2. At this time, the second hole section 32 has a certain volume for accommodating the hot melt post 4 after hot melting, and at the same time, the first hole section 31 also has a certain size to ensure the fixing and supporting effect on the hot melt post 4, thereby ensuring the connection strength between the tab structure 2 and the integrated bus bar 1.

[0061] When it is necessary to increase the volume of the second hole section 32, the size of the second hole section 32 in the opening direction can be appropriately increased. On the contrary, when it is necessary to reduce the volume of the second hole section 32, the size of the second hole section 32 in the opening direction can be appropriately reduced.

[0062] Regarding the cross-sectional area of the second hole section 32, in an exemplary embodiment provided by the present application, when the second hole section 32 is set as a frustum-shaped funnel structure, the maximum diameter of the second hole section 32 at this time is φ2, and φ2 ≤ 7 mm.

[0063] Based on the above embodiments of the present application, when the second hole section 32 is arranged in a frustum-shaped structure, the volume of the second hole section 32 can be adjusted by adjusting the diameter of the second hole section 32. By restricting the diameter of the second hole section 32, it is avoided that the too large aperture of the second hole section 32 affects the strength and connection effect of the bar structure 2. Specifically, for example, when the diameter of the first hole section 31 is set to 4 mm, the diameter of the end of the second hole section 32 connected to the first hole section 31 is 4 mm, and the aperture of the second hole section 32 gradually increases in the direction away from the first hole section 31. The maximum aperture of the second hole section 32 can be set to multiple specific values such as 5 mm, 6 mm or 7 mm.

[0064] In summary, in the present application, the volume of the second hole section 32 depends on the size of the second hole section 32 along the opening direction and the cross-sectional area of the second hole section 32, which can be comprehensively considered in actual production and processing. That is, it is necessary to consider how to set the cross-sectional area of the second hole section 32 and its size along the opening direction to meet the volume requirement for accommodating the hot melt column 4, and at the same time, it is also necessary to consider reducing the influence of the second hole section 32 on the strength of the bar structure 2.

[0065] In some embodiments of the present application, the first hole section 31 can be arranged as a cylindrical hole, the aperture of the second hole section 32 is at least partially larger than the aperture of the first hole section 31, and the diameter of the first hole section 31 is φ1, where 2 mm ≤ φ1 ≤ 5 mm.

[0066] Based on the above embodiments of the present application, when the first hole section 31 is arranged as a cylindrical hole, by restricting the diameter of the first hole section 31, if the diameter of the first hole section 31 is too large, it may affect the strength of the bar structure 2 itself, and if the diameter of the first hole section 31 is too small, it will affect the diameter of the hot melt column 4, thereby affecting the connection strength between the bar structure 2 and the integrated busbar 1. Therefore, by restricting the diameter of the first hole section 31 within a certain range, while ensuring the connection strength between the bar structure 2 and the integrated busbar 1, the influence on the strength of the bar structure 2 is reduced.

[0067] Specifically, when setting the diameter of the first hole section 31, it should be considered to match the diameter of the hot melt column 4. When setting the hot melt column 4, in order to ensure the connection strength after hot melting, it should be avoided that the size of the hot melt column 4 is too thin. When setting the connection hole 3, it should also be avoided that the size is too large to affect the strength of the bar structure 2. At the same time, in order to facilitate the insertion of the hot melt column 4, a certain gap should be left between the first hole section 31 and the hot melt column 4. Therefore, after considering the above requirements, the aperture of the first hole section 31 is restricted as above. Specifically, a suitable setting method can also be selected according to the actual connection situation, and the present application does not make specific restrictions on this.

[0068] Reference Figure 4 As shown in, in some embodiments provided by the present application, the dimension that the hot melt column 4 protrudes from the bar structure 2 before hot melting is L1, and L1 ≥ 0.8 mm.

[0069] Based on the above embodiments of the present application, by restricting the size of the hot melt column 4 protruding from the tab structure 2 before hot melting, when the size of the hot melt column 4 protruding from the tab structure 2 is insufficient, the volume of the disc-shaped fixing structure formed after the hot melt column 4 solidifies again after hot melting will be small, and ultimately the connection strength between the tab structure 2 and the integrated busbar 1 may be low.

[0070] Specifically, the above restriction on the size of the hot melt column 4 protruding from the tab structure 2 before hot melting is to ensure that the volume of the disc-shaped fixing structure formed after hot melting is sufficient, so as to ensure that there is sufficient connection strength between the tab structure 2 and the integrated busbar 1. In this process, it can be specifically set according to the volume of the second hole section 32 and the thickness of the hot melt column 4 itself. For example, when the hot melt column 4 is relatively thick, the size protruding from the tab structure 2 before hot melting can be set smaller, and vice versa, the protruding size needs to be set larger. And when the volume set for the second hole section 32 is larger, the protruding size of the hot melt column 4 can also be set larger.

[0071] Reference Figure 2 As shown in, in some embodiments provided by the present application, at least two connection holes 3 are provided on the tab structure 2, and a hot melt column 4 is disposed in each connection hole 3 in a matching manner.

[0072] Based on the above embodiments of the present application, when the tab structure 2 is fixed only by a single hot melt column 4, the tab structure 2 can rotate around the hot melt column 4 in the horizontal direction, and by providing two hot melt columns 4, the position of the tab structure 2 relative to the integrated busbar 1 in the horizontal direction can be limited, making the connection between the two more stable.

[0073] Specifically, since the tab structure 2 needs to be connected to two adjacent battery cells respectively during use, the tab structure 2 is usually set as a long strip-shaped rectangular structure, and at this time, the connection holes 3 can be arranged in sequence along the length direction of the tab structure 2. At the same time, in order not to affect the connection between the tab structure 2 and the battery cell pole column, the connection holes 3 can be arranged at positions close to the edge of the tab structure 2.

[0074] In the present application, any suitable connection method can be selected between the hot melt column 4 and the integrated busbar 1. In an exemplary embodiment provided by the present application, the hot melt column 4 and the integrated busbar 1 can be integrally provided.

[0075] Based on the above embodiments of the present application, one end of the hot melt column 4 needs to be fixedly connected to the integrated busbar 1. In actual production and processing, the hot melt column 4 and the integrated busbar 1 are integrally formed by injection molding or the like, which not only improves production efficiency but also omits the step of fixing the hot melt column 4 and the integrated busbar 1 during subsequent assembly, thereby simplifying the assembly process.

[0076] In some other embodiments of the present application, the hot melt posts 4 and the integrated busbar 1 can also be processed separately and then connected. However, this connection method has low efficiency in the specific production and processing process, so it can be mainly applied to the early-stage sample processing and other scenarios with high requirements for connection quality.

[0077] In addition, it should also be noted that the above-mentioned busbar component disclosed in the embodiments of the present application is not limited to being applied in the case of the connection between the busbar component and the integrated busbar 1. When the busbar component is connected to other structures through the hot melt posts 4, the above technical solution can also be applied and achieve the corresponding technical effects after adaptive adjustment.

[0078] Based on the above technical solution, according to the second aspect of the present application, a battery pack is provided. The battery pack includes a battery cell and the above-mentioned busbar component. The busbar component is connected to the output end of the battery cell, and the integrated busbar 1 is located between the busbar component and the battery cell.

[0079] Based on the above embodiments of the present application, when the battery pack provided by the present application is in use, the busbar component is connected to the pole column of the battery cell for current input and output, and the integrated busbar 1 is arranged between the busbar component and the battery cell, and the integrated busbar 1 is connected to the battery cell for monitoring and managing the battery pack. When the above busbar component is applied to the battery pack, through the above settings, while ensuring the stable connection between the busbar structure 2 and the integrated busbar 1, the influence of the hot melt posts 4 on the height direction of the battery pack is reduced, thereby improving the energy density of the battery pack.

[0080] According to the third aspect of the present application, an electrical device is provided. The electrical device includes a housing and the above-mentioned battery pack, and the battery pack is arranged in the housing.

[0081] In the present application, the electrical device can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, such as a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, etc., and the spacecraft can include an airplane, a rocket, a space shuttle, a spaceship, etc.

[0082] Based on the above embodiments of the present application, the electrical device provided by the present application includes the above-mentioned battery pack, so it also has the above-mentioned beneficial effects. To avoid repetition, it will not be elaborated here.

[0083] The preferred embodiments of the present application have been described in detail above with reference to the accompanying drawings. However, the present application is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present application, various simple modifications can be made to the technical solution of the present application, and these simple modifications all belong to the protection scope of the present application.

[0084] It should be further noted that, for each of the specific technical features described in the above specific embodiments, they can be combined in any appropriate manner without conflict. To avoid unnecessary repetition, this application will not separately describe various possible combination methods.

[0085] In addition, any combinations can be made among various different embodiments of this application, as long as they do not violate the idea of this application, and they should also be regarded as the content disclosed by this application.

Claims

1. A bar sheet component is connected to an integrated busbar, characterized in that, The bar piece assembly includes: A bar piece structure, on which at least one connection hole is formed, and the connection hole penetrates through the bar piece structure; A hot melt column, the hot melt column is inserted into the connection hole, and the hot melt column is fixedly connected to the integrated busbar; Wherein, the connection hole includes a first hole section and a second hole section, the second hole section is located on a side of the first hole section away from the integrated busbar, and at least part of the size of the second hole section is larger than the size of the first hole section. After the hot melt column is melted, the hot melt column completely fills the connection hole.

2. The patch component according to claim 1, wherein, Before the hot melt column is melted, the end of the hot melt column protrudes from the bar piece structure; The volume of the hot melt column located in the second hole section is V1, the volume of the hot melt column protruding from the bar piece structure is V2, and the volume of the second hole section is V3, and V1 + V2 ≤ V3.

3. The patch component according to claim 1, wherein, The second hole section is arranged as a funnel-shaped structure, the expansion end of the funnel-shaped structure is arranged at one end away from the first hole section, and the contraction end of the funnel-shaped structure is connected to the first hole section.

4. The patch component according to claim 3, characterized in that, The first hole section is a cylindrical hole, at least part of the aperture of the second hole section is larger than the aperture of the first hole section, the diameter of the first hole section is φ1, and 2mm ≤ φ1 ≤ 5mm.

5. The patch component according to claim 4, wherein, The second hole section is arranged as a frustum-shaped funnel-shaped structure, the maximum diameter of the second hole section is φ2, and φ2 ≤ 7mm.

6. The patch component according to claim 2, wherein The size of the hot melt column protruding from the bar piece structure before melting is L1, and L1 ≥ 0.8mm.

7. The patch component according to claim 1, characterized in that, At least two of the above connection holes are arranged on the bar piece structure, and the hot melt column is cooperatively arranged in each connection hole.

8. The patch component according to claim 1, wherein The hot melt column is integrally arranged with the integrated busbar; or, the hot melt column is separately arranged from the integrated busbar and is connected by hot melting.

9. A battery pack, characterized in that, The battery pack includes a battery cell and the bar piece assembly according to any one of claims 1-8; The bar piece assembly is communicated with the output end of the battery cell, and the integrated busbar is located between the bar piece assembly and the battery cell.

10. An electrical device, characterized in that, The electrical equipment includes: The battery pack according to claim 9; and, A housing, and the battery pack is arranged in the housing.

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