Battery module and acquisition mechanism thereof

Abstract

Provided are a battery module and an acquisition mechanism thereof. The battery module acquisition mechanism comprises a bracket and an acquisition group; the acquisition group comprises a series assembly; the series assembly comprises a first series group, a second series group, and a first connection member which are all mounted on the bracket; the first series group and the second series group each comprise a first series row and a second series row which are opposite to each other; the first series row and the second series row are used for serially connecting the corresponding battery cell groups; two first series rows or two second series rows of the first series group and the second series group are connected to one another by means of the first connection member.

Description

Battery module and its collection mechanism

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 18, 2023, with application number 202323464404.X. The entire contents of the above application are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a battery module and a collection mechanism thereof. Background Art

[0003] In related technologies, multiple battery modules in a battery system are connected in series using aluminum bars. The CCS (Cell Contact System) components of these modules are connected to the BMS (Battery Management System) via multiple adapter harnesses. This results in a complex wiring harness for the integrated battery modules, and the CSC (Cell Supervision Circuit) components of multiple battery modules occupy mounting space between the modules, reducing energy density. SUMMARY OF THE INVENTION

[0004] The present application provides a battery module and a collection mechanism thereof, which can improve the technical problem of low energy density.

[0005] In a first aspect, an embodiment of the present application provides a battery module collection mechanism, comprising a bracket and a collection group; the collection group comprises a series assembly; wherein the series assembly comprises a first series group, a second series group and a first connecting member, all of which are mounted on the bracket, the first series group and the second series group each comprise a first series row and a second series row relative to each other, the first series group and the second series group are respectively connected in series with a corresponding battery cell group; the two first series rows or the two second series rows of the first series group and the second series group are interconnected by a first connecting member.

[0006] In the second aspect, an embodiment of the present application provides a battery module, including two collection groups, at least one battery cell grouping, and the above-mentioned battery module collection mechanism having a corresponding number as the battery cell groupings, the battery cell grouping including four battery cell groups, and each collection group corresponds to two battery cell groups. Beneficial effects

[0007] The beneficial effects of the present application are as follows: the present application provides a battery module acquisition mechanism which realizes integration by arranging a first series group and a second series group on the same bracket, and connecting the cell groups corresponding to the first series group and the second series group in series using a first connecting member, thereby facilitating the two cell groups to share a cell signal acquisition device, thereby reducing the CSC components connected to the cell signal acquisition device, saving part of the space originally used for installing the CSC components, so as to provide space for installing more cells, improve energy density, and solve the technical problem of low energy density in related technologies.

[0008] The present application provides a battery module, comprising two acquisition groups, at least one battery cell group, and the above-mentioned battery module acquisition mechanisms having a corresponding number as the battery cell group. The above-mentioned battery cell module acquisition mechanisms realize that the battery cell groups share a battery cell signal acquisition device, reduce the CSC components connected to the battery cell signal acquisition device, so as to allow for the installation of more battery cells, improve energy density, and solve the technical problem of low energy density in related technologies. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] FIG1 is a schematic structural diagram of a battery module provided in an embodiment of the present application;

[0010] FIG2 is an enlarged view of point A in FIG1 .

[0011] FIG3 is a perspective schematic diagram of a collection assembly provided in an embodiment of the present application.

[0012] FIG4 is an enlarged view of point B in FIG3 .

[0013] FIG5 is a perspective schematic diagram of a first connecting member provided in an embodiment of the present application.

[0014] FIG6 is a perspective schematic diagram of a bracket provided in an embodiment of the present application.

[0015] FIG7 is a schematic structural diagram of the side of the two battery module collection mechanisms facing the battery cells provided in an embodiment of the present application.

[0016] FIG8 is an enlarged view of point C in FIG7 .

[0017] FIG9 is a schematic structural diagram of a first positioning member provided in an embodiment of the present application.

[0018] Figure 10 is a schematic structural diagram of a battery module acquisition mechanism provided in an embodiment of the present application;

[0019] FIG11 is a schematic structural diagram of a battery group provided in an embodiment of the present application.

[0020] Description of the accompanying drawings;

[0021] 1. Battery module collection mechanism; 100. Collection group; 110. Series assembly; 120. Collection assembly; 11. First series group; 12. Second series group; 101. First series row; 102. Second series row; 13. First collection line; 131. First connecting part; 132. First buffer; 133. First groove; 14. Second collection line; 141. Second connecting part; 142. Second buffer; 143. Second groove; 21. First connecting member; 211. First protrusion; 212. First depression; 22. First integrated member; 23. Second integrated member; 3. Bracket; 31. Collection line mounting slot; 32. Connector mounting slot; 33. Explosion-proof hole; 4. Connecting circuit board; 5. First positioning member; 51. First positioning groove; 6. Second positioning member; 61. Second positioning groove; 7. Cell grouping; 71. Cell group. Modes for Carrying Out the Invention

[0022] In the description of this application, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0023] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0024] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0025] Example 1

[0026] 1 and 11 , the present application provides a battery module collection mechanism 1 comprising:

[0027] Bracket 3; and

[0028] The collection group 100 includes a series assembly 110;

[0029] The series assembly 110 includes a first series group 11, a second series group 12 and a first connector 21, all of which are installed on the bracket 3. The first series group 11 and the second series group 12 each include a first series row 101 and a second series row 102 relative to each other. The first series group 11 and the second series group 12 are respectively connected in series with a corresponding battery cell group 71; the two first series rows 101 or the two second series rows 102 of the first series group 11 and the second series group 12 are connected to each other through the first connector 21.

[0030] Arranging the first and second series rows 101, 102 on the same bracket 3 allows for closer installation of the corresponding cell groups 71, improving space utilization. Furthermore, by connecting the first and second series rows 101, 102 via the first connector 21, the corresponding cell groups 71 are integrated, facilitating the two cell groups 71 to share a cell signal acquisition device. This reduces the number of CSC components connected to the cell signal acquisition device, freeing up space previously reserved for CSC components and allowing for more cells to be installed, thereby improving energy density.

[0031] Example 2

[0032] 1 and 11 , a battery module collection mechanism 1 provided in an embodiment of the present application includes a bracket 3 and a collection group 100 . The collection group 100 includes a series assembly 110 and a collection assembly 120 .

[0033] The series assembly 110 includes a first series group 11 , a second series group 12 and a first connector 21 , all of which are mounted on the bracket 3 .

[0034] The collection assembly 120 includes a first collection line 13 and a second collection line 14 which are mounted on the bracket 3 and arranged opposite to each other.

[0035] The first series group 11 is used to connect a battery cell group 71 in series, and the second series group 12 is used to connect a battery cell group 71 in series. The first series group 11 and the second series group 12 both include opposite first series rows 101 and second series rows 102. The first series rows 101 and the second series rows 102 are provided in the same number, and the first series rows 101 and the second series rows 102 are both used to connect the positive and negative poles of adjacent battery cells, and the opposite first series rows 101 and the second series rows 102 are used to connect the positive and negative poles of the same battery cell. The first connector 21 is provided between the first series group 11 and the second series group 12 and is used to connect the two first series rows 101 or the two second series rows 102 of the first series group 11 and the second series group 12 in series, thereby connecting the battery cell groups 71 corresponding to the first series group 11 and the second series group 12 in series, thereby realizing the integration between the battery cell groups 71 corresponding to the first series group 11 and the second series group 12.

[0036] The bracket 3 is provided with explosion-proof holes 33 for exposing multiple explosion-proof valves of the battery cells. The multiple explosion-proof holes 33 are respectively arranged between the first series row 101 and the second series row 102 to ensure the smooth operation of the battery cell explosion-proof valves.

[0037] 1 and 3 , first and second acquisition lines 13, 14 are located between first series row 101 and second series row 102. First acquisition line 13 electrically connects first series rows 101 of first series group 11 and second series group 12, while second acquisition line 14 electrically connects second series rows 102 of first series group 11 and second series group 12. First and second acquisition lines 13, 14 are used to collect voltage and temperature signals, etc., of corresponding battery cell groups 71.

[0038] The series assembly 110 further includes two connection circuit boards 4 connected to the first acquisition line 13 and the second acquisition line 14. The two connection circuit boards 4 are respectively arranged at one end of the first acquisition line 13 and the second acquisition line 14 to facilitate connection with the connector of the CSC assembly.

[0039] Referring to Figures 3 and 4 , the first acquisition line 13 includes two first connecting portions 131 and a first buffer portion 132 connected between the two first connecting portions 131. The two first connecting portions 131 are respectively connected to the two first series rows 101 of the first series group 11 and the second series group 12. The first buffer portion 132 has a first groove 133 facing the bracket 3. Along the extension direction of the first acquisition line 13, the distance between the first groove 133 and the first series row 101 of the first series group 11 is equal to the distance between the first groove 133 and the first series row 101 of the second series group 12.

[0040] The second collection line 14 includes two second connecting portions 141 and a second buffer portion 142 connected between the two second connecting portions 141. The two second connecting portions 141 are respectively connected to the two second series rows 102 of the first series group 11 and the second series group 12. The second buffer portion 142 has a second groove 143 facing the bracket 3. Along the extension direction of the second collection line 14, the distance between the second groove 143 and the second series row 102 of the first series group 11 is equal to the distance between the second groove 143 and the second series row 102 of the second series group 12. This ensures that both the first groove 133 and the second groove 143 are located between the first series row 101 and the second series row 102. When the battery cells of the battery module heat and expand, the tension exerted by the cells on the two first connecting portions 131 and the two second connecting portions 141 is as equal as possible. This allows the first buffer portion 132 and the second buffer portion 142 to expand to a greater extent to better accommodate the cell expansion.

[0041] A virtual connecting line between the center of the first groove 133 and the center of the second groove 143 is perpendicular to the extending direction of the first collecting line 13 , so that the first buffer portion 132 and the second buffer portion 142 have the same extending direction.

[0042] The expansion of the battery cell is calculated through model simulation. For example, when the expansion of the battery cell is 1.5 mm, the length of the first buffer portion 132 and the second buffer portion 142 is twice the expansion of the battery cell, that is, 3.0 mm.

[0043] 1 and 5 , the first connecting member 21 is provided with a first protrusion 211 facing away from the bracket 3 , and the first connecting member 21 is provided with two first recesses 212 located on both sides of the first protrusion 211 , and the two first recesses 212 are recessed toward the bracket 3 .

[0044] The first connector 21 has a W-shaped structure. When the battery cell heats up and expands, the first connector 21 can expand to accommodate the expansion of the battery cell. Furthermore, compared to a solution in which the first connector 21 has only one first recess 212, the first protrusion 211 provided between the two first recesses 212 can improve the structural strength of the first connector 21, minimizing the risk of breaking the first connector 21 and preventing plastic deformation.

[0045] The first protrusion 211 extends along an extending direction perpendicular to the first collecting line 13 .

[0046] The width and depth of the first protrusion 211 and the first recess 212 were determined based on actual cell expansion and tensile testing. In this embodiment, the dimensions of the first connector 21 are 114.4 mm * 61 mm * 1.2 mm, and the depth of the first recess 212 is equal to the height of the first protrusion 211, both 3.5 mm. In this embodiment, the series assembly 110 is made of aluminum, and the bracket 3 is made of plastic.

[0047] Example 3

[0048] 11 , 10 and 11 , an embodiment of the present application further provides a battery module, comprising the battery module collection mechanism 1 , the battery cell grouping 7 and the integrated connection assembly described in Embodiment 1 or 2.

[0049] There are two battery module collection mechanisms 1 and they correspond one to one with the two battery cell groups 7. The battery cell group 7 includes four battery cell groups 71. There are two collection groups 100, and one collection group 100 corresponds to two battery cell groups 71. The two battery cell groups 71 are electrically connected to the first series group 11 and the second series group 12 respectively.

[0050] The integrated connection assembly includes a first integrated part 22 and a second integrated part 23 .

[0051] When the first connecting member 21 connects the two first series rows 101 of the first series group 11 and the second series group 12, the first integrated member 22 connects the two second series rows 102 of the two collection groups 100, and the two second series rows 102 of the two first series groups 11 of the two battery module collection mechanisms 1 are connected to each other through the second integrated member 23. The second integrated member 23 is arranged on the side of the first series row 101 away from the first integrated member 22.

[0052] Alternatively, when the first connector 21 connects the two second series rows 102 of the first series group 11 and the second series group 12, the first assembly 22 connects the two first series rows 101 of the two collection groups 100. The two first series rows 101 of the two first series groups 11 of the two battery module collection mechanisms 1 are interconnected via the second assembly 23. The second assembly 23 is located on a side of the first series rows 101 away from the first assembly 22. The second assembly 23 is provided with an insulating sleeve for insulation from the crossbeams of the battery module box. When the safety distance between the second assembly 23 and the crossbeams of the battery module box is small, the battery is protected from short circuits.

[0053] In this embodiment, the first connecting member 21 connects the two second series rows 102 of the first series group 11 and the second series group 12. At this time, the current flow of the battery module is as follows: in one of the collection groups 100, the current flows through the first series group 11 and the second series group 12 through the first series row 101 of adjacent battery cells in series, and flows through the battery cell group 71 corresponding to the first series group 11. Through the first connecting member 21, the current flows into a second series row 102 of the second series group 12 and flows through the battery cell group 71 corresponding to the second series group 12; then, through the first integrated member 22, the current flows into a first series row 101 of the first series group 11 in another collection group 100 and flows through the battery cell group 71 corresponding to the first series group 11; through the first connecting member 21, the current flows into a second series row 102 of the second series group 12 and flows through the battery cell group 71 corresponding to the second series group 12; finally, through the second integrated member 23, the current flows into a first series row 101 of the first series group 11 of another battery module collection mechanism 1.

[0054] The virtual extension lines between the two first protrusions 211 of the two first connectors 21 of the two collection groups 100 overlap, so that the two first connectors 21 on a battery module collection mechanism 1 are evenly stressed, which facilitates better adaptation to the expansion of the battery cell.

[0055] In other embodiments, the two first connecting members 21 of the two collecting groups 100 can be connected to the two first series rows 101 or the two second series rows 102 respectively.

[0056] The integration of the four cell groups 71 is achieved through the first connector 21 and the first integration component 22, integrating the original four battery modules into a large battery module, thereby improving energy density. By extending the acquisition line on the original basis, the number of CSC components is reduced, thereby reducing the number of intermediate adapter harnesses.

[0057] In other embodiments, the number of cell groups 7 can be three, four, or even more. The number of battery module collection mechanisms 1 corresponding to the number of cell groups 7 can also be three, four, or even more. The cell groups 7 corresponding to different battery module collection mechanisms 1 are electrically connected via the second assembly 23, and different collection groups 100 are electrically connected via the first assembly 22.

[0058] 6 , the bracket 3 is provided with four collection line installation slots 31 for installing the collection group 100, and the bracket 3 is further provided with two connector installation slots 32 for installing the first connector 21 and the second connector. Both the collection line installation slots 31 and the connector installation slots 32 are of a conformal design.

[0059] Referring to Figure 7 , a battery module further includes positioning members, which include two opposing first and second positioning members 5 and 6. The first and second positioning members 5 and 6 are heat-riveted to the bracket 3 and are both located on the side of the bracket 3 facing the battery cell group 71. The first positioning member 5 is located between the two first series rows 101 of the first series group 11 and the second series group 12 of one collection group 100, and the second positioning member 6 is located between the two first series rows 101 of the first series group 11 and the second series group 12 of another collection group 100.

[0060] 7 , 8 and 9 , the first positioning member 5 is provided with two first positioning grooves 51 , i.e., positioning grooves of the positioning member. The two first positioning grooves 51 respectively expose a portion of the two first series rows 101 . The first positioning grooves 51 are used for embedding the poles of the battery cell, and play a positioning role when the battery cell and the first series row 101 are welded.

[0061] The second positioning member 6 is provided with two second positioning grooves 61, i.e., positioning grooves of the positioning member. The two second positioning grooves 61 respectively expose a portion of the two first series rows 101 of the first series group 11 and the second series group 12 of the other collection group 100. The second positioning grooves 61 are used for embedding the poles of the power cell, and play a positioning role when the battery cell is welded to the two first series rows 101 of the first series group 11 and the second series group 12 of the other collection group 100.

Claims

1. A battery module collection mechanism (1), comprising: Bracket (3); as well as A collection group (100), comprising a series assembly (110); The series assembly (110) comprises a first series group (11), a second series group (12) and a first connecting member (21) which are all mounted on the bracket (3); the first series group (11) and the second series group (12) each comprise a first series row (101) and a second series row (102) which are opposite to each other; the first series group (11) and the second series group (12) are respectively connected in series with a corresponding battery cell group; and the two first series rows (101) or the two second series rows (102) of the first series group (11) and the second series group (12) are connected to each other via the first connecting member (21).

2. The battery module collection mechanism (1) according to claim 1, wherein: The first connecting member (21) is provided with a first protrusion (211) facing away from the bracket (3).

3. The battery module collection mechanism (1) according to claim 2, wherein: The collecting groups (100) are provided with two, and the virtual extension lines of the two first protrusions (211) of the two collecting groups (100) overlap.

4. The battery module collection mechanism (1) according to claim 2, wherein: The first connecting member (21) is provided with two first recesses (212) located on both sides of the first protrusion (211).

5. The battery module collection mechanism (1) according to claim 2, wherein: The collection group (100) further comprises a collection assembly (120), wherein the collection assembly (120) comprises a first collection line (13) and a second collection line (14) both mounted on the bracket (3) and arranged opposite to each other; the first collection line (13) is electrically connected to the two first series connection rows (101) of the first series connection group (11) and the second series connection group (12), and the second collection line (14) is electrically connected to the two second series connection rows (102) of the first series connection group (11) and the second series connection group (12).

6. The battery module collection mechanism (1) according to claim 5, wherein: The first collection line (13) comprises two first connection parts (131) and a first buffer part (132) connected between the two first connection parts (131), the two first connection parts (131) are respectively connected to the two first series rows (101) of the first series group (11) and the second series group (12), and the first buffer part (132) is provided with a first groove (133) facing the bracket (3); the second collection line (14) comprises two second connection parts (141) and a second buffer part (142) connected between the two second connection parts (141), the two second connection parts (141) are respectively connected to the two second series rows (102) of the first series group (11) and the second series group (12), and the second buffer part (142) is provided with a second groove (143) facing the bracket (3); a virtual connection line between the center of the second groove (143) and the center of the first groove (133) is perpendicular to the extension direction of the first collection line (13).

7. The battery module collection mechanism (1) according to claim 6, wherein: The extension directions of the two first collecting lines (13) of the two collecting groups (100) are parallel.

8. A battery module, comprising at least one battery cell group (7), and comprising a battery module collection mechanism (1) as described in any one of claims 1 to 7 having a corresponding number as the battery cell group (7), wherein the battery cell group (7) comprises four battery cell groups, and the battery module collection mechanism (1) comprises two collection groups (100), and each collection group (100) corresponds to two battery cell groups.

9. The battery module according to claim 8, further comprising an integrated connection component, wherein the integrated connection component comprises a first integrated component (22), and the two first series rows (101) of the two series assemblies (110) are interconnected through the first integrated component (22). When the first connecting component (21) connects the two first series rows (101) of the first series group (11) and the second series group (12), the first integrated component (22) connects the two second series rows (102) of the two collection groups (100). When the first connecting component (21) connects the two second series rows (102) of the first series group (11) and the second series group (12), the first integrated component (22) connects the two first series rows (101) of the two collection groups (100).

10. The battery module according to claim 9, wherein: Two of the battery cell groups (7) are provided, and two of the battery module collection mechanisms (1) are provided corresponding to the two battery cell groups (7). The integrated connection assembly comprises a second integrated component (23), and the second integrated component (23) is provided on a side of the first series row (101) away from the first integrated component (22). When the first connecting component (21) connects the two first series rows (101) of the first series group (11) and the second series group (12), the two second series rows (102) of the two first series groups (11) of the two battery module collection mechanisms (1) are connected to each other through the second integrated component (23). When the first connecting component (21) connects the two second series rows (102) of the first series group (11) and the second series group (12), the two first series rows (101) of the two first series groups (11) of the two battery module collection mechanisms (1) are connected to each other through the second integrated component (23).

11. The battery module according to claim 9, wherein: It also includes a positioning member connected to the side of the bracket (3) facing the battery group, the positioning member is located between the two first series rows (101) or the two second series rows (102) of the first series group (11) and the second series group (12), and the positioning member is provided with a positioning groove for the pole of the corresponding battery cell to be embedded.

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