Composite module and battery pack
The battery module design with integrated busbar and aluminum bar connection eliminates the copper busbar connection, solves the space occupation and cost increase problems caused by copper busbar in the battery module, and achieves higher energy density and reliability.
Patent Information
- Application Number
- CN202422755155.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-12
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-11-12
AI Technical Summary
In existing battery modules, the use of copper busbars increases the possibility of electrical connection failure, takes up space, increases costs and reduces the energy density of the battery pack.
An integrated busbar is used to connect the battery cell groups through aluminum bars, eliminating copper bar connections, simplifying the circuit structure, and utilizing intra-group and cross-group aluminum bars to achieve electrical connection of the battery cell groups, with the output aluminum bars located at the same end.
It reduces the cost of the battery pack, improves the energy density, simplifies the structure, reduces space occupation, and improves reliability and economy.
Smart Images
Figure CN223451133U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to battery technology field, specifically, relate to a kind of composite module and battery pack. BACKGROUND
[0002] Composite module usually includes multiple electric core groups and multiple busbars, each electric core group is sequentially arranged along the width direction, each busbar is covered on the corresponding electric core group, and aluminum bar is arranged on the busbar to electrically connect each electric core of the corresponding electric core group. Adjacent electric core groups usually need to be connected by copper bar, thereby increasing the bolt electrical connection point, increasing the possibility of electrical connection failure. The setting of copper bar also increases the size of the battery module in the height direction, occupies a larger space in the battery pack. Copper bar is relatively high in price, which will increase the cost of the battery pack.
[0003] Two output aluminum bars (positive output aluminum bar and negative output aluminum bar) on the busbar at the top of part of the battery module are located at both ends of the battery module. In order to facilitate the lead wire in the later period, it is usually necessary to connect an output aluminum bar at the tail of the battery module by a special copper bar, and the other end of the copper bar extends to the front side of the battery module to realize the same side of the positive and negative electrodes. The structure design of this embodiment is complex, and a long copper bar is also needed, which increases the cost, and a space for accommodating the long copper bar needs to be reserved, which is not conducive to improving the energy density of the battery pack.
[0004] Therefore, the utility model is proposed. UTILITY MODEL CONTENT
[0005] To solve the above technical defects, the utility model provides a composite module and a battery pack.
[0006] According to the first aspect of the application, a composite module is provided, comprising:
[0007] A plurality of electric core groups, each electric core group comprising a plurality of electric cores arranged in sequence, and each electric core group being sequentially arranged along the width direction;
[0008] An integrated busbar, the integrated busbar being covered on each electric core group, and a plurality of aluminum bars being arranged on the integrated busbar, each aluminum bar comprising a plurality of intra-group aluminum bars and a plurality of cross aluminum bars, each intra-group aluminum bar being used to electrically connect the electric cores in the same electric core group, and each cross aluminum bar being used to electrically connect the electric cores located on different electric core groups, the intra-group aluminum bars and the cross aluminum bars electrically connecting the electric cores of each electric core group, and two output aluminum bars in each aluminum bar being located at the same end of the integrated busbar;
[0009] Two terminal seats, the two terminal seats being located at the same end of the integrated busbar, and the two terminal seats being electrically connected to the corresponding output aluminum bars respectively.
[0010] Optionally, the intra-group aluminum bars extend along the length direction of the battery cell group, and the extension direction of the cross aluminum bars is perpendicular to the extension direction of the intra-group aluminum bars.
[0011] Optionally, the battery cells at the end of the adjacent two battery cell groups are electrically connected by the cross aluminum bars.
[0012] Optionally, the battery cell groups include a plurality of first battery cell groups and a plurality of second battery cell groups.
[0013] The battery cells in the first battery cell groups are electrically connected by intra-group aluminum bars.
[0014] The battery cells in the adjacent second battery cell groups are electrically connected by a plurality of intra-group aluminum bars and cross aluminum bars.
[0015] Optionally, the battery cells at opposite positions in the adjacent second battery cell groups are electrically connected by the cross aluminum bars.
[0016] The battery cells in the same second battery cell group are electrically connected by intra-group aluminum bars.
[0017] A plurality of intra-group aluminum bars are arranged on both sides of each column of cross aluminum bars.
[0018] Optionally, the battery cell groups include only two second battery cell groups.
[0019] Optionally, the battery cell groups include a plurality of first battery cell groups and a plurality of second battery cell groups.
[0020] Optionally, the number of the battery cell groups is greater than or equal to 3, and the number of the battery cell groups is an odd number.
[0021] Optionally, the aluminum bars are provided with positioning holes.
[0022] The integrated busbar is provided with positioning columns.
[0023] In the state that the aluminum bars are installed on the integrated busbar, the positioning columns are inserted into the positioning holes.
[0024] Optionally, the aluminum bars are provided with welding cooperation holes.
[0025] In the state that the aluminum bars are installed on the integrated busbar, the tabs of the battery cells are exposed to the welding cooperation holes.
[0026] According to a second aspect of the present application, a battery pack is provided, comprising:
[0027] A shell having a cavity.
[0028] The composite module described above is arranged in the cavity.
[0029] By adopting the technical scheme, the application has the following beneficial effects:
[0030] The composite module of the application can simultaneously cover multiple battery cell groups through the integrated busbar, and the battery cell groups do not need to be connected through copper bars, but can be connected through the aluminum bars on the busbar, thereby simplifying the circuit structure and reducing the cost. The matching structure of the application does not set copper bars, and does not need to reserve space for the copper bars, so that the overall structure is compact, which is beneficial to reducing the volume of the matching structure and improving the energy density of the battery pack.
[0031] The specific embodiments of the application will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS
[0032] The accompanying drawings, which are part of the present application, serve to provide a further understanding of the present application, and the schematic embodiments of the present application and the description thereof serve to explain the present application, but do not constitute an improper limitation on the present application. Obviously, the drawings described below are only some embodiments, and other drawings can be obtained by those skilled in the art without creative labor. In the drawings:
[0033] Figure 1 Fig. 1 shows a perspective structural schematic view of a composite module provided by an embodiment of the application;
[0034] Figure 2 Fig. 2 shows a top view of the composite module provided by the embodiment of the application;
[0035] Figure 3 Fig. 3 shows a current flow direction identification diagram in the composite module provided by the embodiment of the application.
[0036] In the drawings, 1, first battery cell group; 2, second battery cell group; 3, integrated busbar; 4, intra-group aluminum bar; 5, cross aluminum bar; 6, terminal seat; a, end plate; b, positioning hole; c, welding matching hole.
[0037] It should be noted that these drawings and written descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION
[0038] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments will be described clearly and completely below with reference to the drawings of the embodiments of the present application. The following embodiments are used to illustrate the present application, but not to limit the scope of the present application.
[0039] In the description of the utility model, it needs to explain, the term "upper", "lower", "inner", "outer" and so on indicate the orientation or position relation is based on the orientation or position relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and is not indicate or imply the device or must have a specific orientation, with a specific orientation structure and operation, therefore cannot be understood as the limitation of the utility model.
[0040] In the description of the utility model, it needs to explain, unless otherwise expressly provided and limited, the term "installation", "connection" should be broad understanding, for example, can be fixed connection, can be detachable connection, or integrally connected, can be mechanical connection, can be electrical connection, can be directly connected, also can be indirectly connected through intermediate medium.
[0041] As Figure 1 And Figure 2 The utility model discloses a composite module, including: multiple electric core groups, integral busbar 3 and two terminal seat 6.Each electric core group includes the electric core and the end plate a located at both ends of each electric core arranged in sequence, each electric core group is arranged in sequence along the width direction, the integral busbar 3 is covered on each electric core group, multiple aluminum bars are provided on the integral busbar 3, each aluminum bar includes multiple group aluminum bars 4 and multiple cross aluminum bars 5, each group aluminum bar 4 is used to electrically connect the electric core in the same electric core group, each cross aluminum bar 5 is used to electrically connect the electric core on different electric core groups, each group aluminum bar 4 and cross aluminum bar 5 electrically connect the electric core of each electric core group, two output aluminum bars in each aluminum bar are located at the same end of the integral busbar 3, two terminal seats 6 are located at the same end of the integral busbar 3, and two terminal seats 6 are electrically connected with corresponding output aluminum bars respectively.Two terminal seats 6 can be connected to the end plate a at the end of the electric core group.
[0042] The composite module of the application can cover multiple electric core groups through the integral busbar 3, and the electric cores of the electric core groups can be connected through the aluminum bars on the busbar without copper bars, so that the circuit structure is simplified and the cost is reduced.The matching structure of the application does not provide copper bars, and does not need to reserve space for the copper bars, so that the overall structure is compact, which is beneficial to reducing the volume of the matching structure and improving the energy density of the battery pack.
[0043] The two output aluminum bars are positive and negative output aluminum bars, and the positive and negative output aluminum bars can be located at the same end of the electric core group through the continuous cross connection of the aluminum bars between adjacent electric core groups, which facilitates the later wiring.
[0044] In some possible embodiments, the intra-group aluminum bus 4 extends along the length direction of the cell group, and the extension direction of the cross aluminum bus 5 is perpendicular to the extension direction of the intra-group aluminum bus 4. The intra-group aluminum bus 4 is used to connect two adjacent cells in the same cell group, and thus the extension direction of the intra-group aluminum bus 4 is the arrangement direction of the cells in the cell group. The cross aluminum bus 5 is used to connect two opposite cells of adjacent cell groups, and thus the extension direction of the cross aluminum bus 5 is the arrangement direction of the cell groups.
[0045] In the embodiments of the present application, by using the combination scheme of the intra-group aluminum bus 4 and the cross aluminum bus 5 and adopting a reasonable current flow direction, the cells are connected, the intermediate series copper bars are cancelled, and the long copper bar connection is avoided, which is good for economy and light weight.
[0046] In some possible embodiments, the cells at the ends of two adjacent cell groups are electrically connected by the cross aluminum bus 5. By continuously connecting the positive and negative levels of the two cell groups by the cross aluminum bus 5, the positive output aluminum bus and the negative output aluminum bus can be located at the same end of the battery module, the long copper bar connection is avoided, the structure is simplified, the cost is reduced, and the reliability is improved.
[0047] In some possible embodiments, each of the cell groups includes a plurality of first cell groups 1 and a plurality of second cell groups 2, each cell in the first cell group 1 is electrically connected by the intra-group aluminum bus 4, and each cell in the adjacent second cell group 2 is electrically connected by a plurality of intra-group aluminum buses 4 and a cross aluminum bus 5. The ends of the adjacent first cell group 1 and the second cell group 2 are electrically connected by the cross aluminum bus 5.
[0048] In the first cell group 1, the positive and negative poles of the adjacent cells are opposite, and thus the intra-group aluminum bus 4 can be used to connect the cells. In the second cell group 2, the positive and negative poles of the adjacent cells are staggered, and thus the intra-group aluminum bus 4 and the cross aluminum bus 5 can be regularly arranged to connect the cells.
[0049] In some possible embodiments, the two cells with opposite positions in the adjacent second cell group 2 are electrically connected by the cross aluminum bus 5, the two adjacent cells in the same second cell group 2 are electrically connected by the intra-group aluminum bus 4, and one column of intra-group aluminum buses 4 is arranged on the two sides of each column of cross aluminum buses 5.
[0050] The two second cell groups 2 can be connected in series by regularly arranging one column of cross aluminum buses 5 and two columns of intra-group aluminum buses 4. The whole current flow direction is shown by the black dashed line in FIG. 6. Figure 3 In the embodiments of the present application, by adopting a reasonable current flow direction, the intermediate series copper bars are cancelled, and the long copper bar connection is avoided, which is good for economy and light weight.
[0051] In some possible embodiments, each of the cell groups has only two second cell groups 2. In the embodiments of the present application, the number of second cell groups 2 is reduced as much as possible, and the first cell group 1 is used more, that is, the number of cross aluminum bars 5 is reduced, and the use of the aluminum bar 4 in the group is more conducive to improving the reliability of the product.
[0052] In some possible embodiments, in each of the cell groups, a plurality of cell groups at one end are second cell groups 2. Usually, the two adjacent cell groups at one end are second cell groups 2, and the remaining cell groups are first cell groups 1.
[0053] In some possible embodiments, the number of cell groups is greater than or equal to 3, and the number of cell groups is an odd number, for example, the number of cell groups of the composite module can be 3, 5, etc. Through the number limitation, the arrangement of each aluminum bar can make the final two output aluminum bars located at the same end of the composite module, which is convenient for later wiring.
[0054] In some possible embodiments, a positioning hole b is arranged on the aluminum bar, a positioning column is arranged on the integrated busbar 3, and in the state that the aluminum bar is installed on the integrated busbar 3, the positioning column is inserted into the positioning hole b. In the process of assembling the aluminum bar of the composite module, the aluminum bar is first placed on the integrated busbar 3, and when the positioning hole b of the aluminum bar is sleeved on the positioning column on the integrated busbar 3, it can be ensured that the aluminum bar is installed in place. It can be seen that the arrangement of the positioning column and the positioning hole b is conducive to precise assembly of the aluminum bar sheet and improves the assembly efficiency and assembly quality.
[0055] In some possible embodiments, a welding cooperation hole c is arranged on the aluminum bar, and in the state that the aluminum bar is installed on the integrated busbar 3, the tab of the cell is exposed to the welding cooperation hole c. The arrangement of the welding cooperation hole c facilitates the welding and fixation of the aluminum bar and the tab of the cell. The solder can be filled in the welding cooperation hole c to stably and effectively weld the tab and the aluminum bar.
[0056] The embodiments of the present disclosure also provide a battery pack, which comprises a shell and the composite module described above. The shell has a cavity, and the composite module is arranged in the cavity. The battery pack can comprise a water cooling plate, and the composite module can be supported on the water cooling plate. The composite module can be cooled by the water cooling plate, so that each cell of the composite module maintains good working conditions. The battery pack provided by the embodiments of the present application has simple structure, compact internal structure layout, low cost, and is suitable for promotion.
[0057] The above merely describes preferred embodiments of the present application and is not intended to limit the present application in any form. Although the above has disclosed preferred embodiments of the present application, it is not intended to limit the present application. Any skilled person in the art can make some changes or modifications to the above-mentioned technical content without departing from the technical solution of the present application, and equivalent embodiments with equivalent changes are equivalent. Any simple modification, equivalent change and modification of the above embodiments made according to the technical essence of the present application still belong to the scope of the present application.
Claims
1. A composite module, characterized in that: include: A plurality of battery cell groups, each battery cell group comprising a plurality of battery cells arranged in sequence, and each of the battery cell groups being arranged in sequence along a width direction; An integrated busbar, the integrated busbar covering each of the battery cell groups, the integrated busbar being provided with a plurality of aluminum bars, each of the aluminum bars comprising a plurality of intra-group aluminum bars and a plurality of cross-link aluminum bars, each intra-group aluminum bar being used to electrically connect battery cells within the same battery cell group, each cross-link aluminum bar being used to electrically connect battery cells located in different battery cell groups, each intra-group aluminum bar and cross-link aluminum bar electrically connecting the battery cells of each battery cell group, and two output aluminum bars in each aluminum bar being located at the same end of the integrated busbar; Two terminal blocks are located at the same end of the integrated busbar, and the two terminal blocks are electrically connected to corresponding output aluminum bars.
2. The composite module according to claim 1, characterized in that: The aluminum bars within the group extend along the length direction of the battery cell group, and the extending direction of the cross-connecting aluminum bars is perpendicular to the aluminum bars within the group; The battery cells at the ends of two adjacent battery cell groups are electrically connected via the jumper aluminum bar.
3. The composite module according to claim 1, characterized in that: Each of the battery cell groups includes a plurality of first battery cell groups and a plurality of second battery cell groups; The cells of the first cell group are electrically connected via aluminum bars within the group; The battery cells of the adjacent second battery cell group are electrically connected via a plurality of intra-group aluminum bars and jumper aluminum bars; The ends of the adjacent first battery cell group and the second battery cell group are electrically connected by a jumper aluminum bar.
4. The composite module according to claim 3, characterized in that: Two battery cells located opposite to each other in the adjacent second battery cell group are electrically connected via a jumper aluminum bar; Two adjacent battery cells in the same second battery cell group are connected via an aluminum bar within the group; A row of intra-group aluminum bars is set on both sides of each row of cross-link aluminum bars.
5. The composite module according to claim 3, characterized in that: Each of the battery cell groups has only two second battery cell groups.
6. The composite module according to claim 3, characterized in that: Among the battery cell groups, the battery cell groups located at one end are second battery cell groups.
7. The composite module according to claim 1, characterized in that: The number of the battery cell groups is greater than or equal to 3, and the number of the battery cell groups is an odd number.
8. The composite module according to claim 1, wherein: Positioning holes are provided on the aluminum bar; A positioning column is provided on the integrated busbar; When the aluminum bar is installed on the integrated busbar, the positioning post is inserted into the positioning hole.
9. The composite module according to claim 1, wherein: The aluminum bar is provided with a welding matching hole; When the aluminum bar is mounted on the integrated busbar, the tabs of the battery cell are exposed to the welding fitting holes.
10. A battery pack, characterized in that: include: a housing having a cavity; The composite module according to any one of claims 1 to 9, wherein the composite module is disposed in the cavity.