Battery pack

Abstract

The utility model discloses a battery pack. The battery pack comprises a box body, the battery pack is arranged in the box body; the BDU module is arranged in the box body and is electrically connected with the battery pack; the electric connector is arranged in the box body and electrically connected with the battery pack and the BDU module, and the electric connector and the BDU module are arranged at the two opposite ends of the battery pack in the X direction; and the diversion aluminum bar is arranged above the battery pack in a crossing manner along the X direction and is electrically connected with the BDU module and the electric connector respectively. According to the battery pack disclosed by the utility model, the BDU module and the electric connector are connected through the diversion aluminum row, so that the assembly cost of the battery pack can be reduced, and meanwhile, the occupied height in the Z direction is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly relates to a battery pack. Background Art

[0002] A battery pack is a device for providing electric power. In the structure of a battery pack, it includes a battery pack designed in a box body, a BDU (Battery Disconnect Unit), an electrical connector, and a CCS (Cells Contact System, integrated busbar). The BDU and the electrical connector are designed at both ends of the battery pack, and are electrically connected by a connecting copper bar spanning across the battery pack. When installing the connecting copper bar, since the connecting copper bar has a certain extension length, a support structure is designed on the battery module to support the connecting copper bar. Thus, since the support structure has a certain height, it leads to an increase in the height of the battery pack in the Z direction, and ultimately results in an increase in the height of the battery pack in the height direction. Summary of the Utility Model

[0003] To solve at least one of the problems existing in the above-mentioned prior art, according to one aspect of the present utility model, a battery pack is provided, including: a box body; a battery pack, disposed in the box body; a BDU module, disposed in the box body and electrically connected to the battery pack; an electrical connector, disposed in the box body and electrically connected to the battery pack and the BDU module respectively, wherein the electrical connector and the BDU module are disposed at opposite ends of the battery pack along the X direction; a diversion aluminum bar, spanning above the battery pack along the X direction and electrically connected to the BDU module and the electrical connector respectively.

[0004] In some embodiments, the battery pack further includes two external connecting copper bars disposed at both ends of the diversion aluminum bar, and the two external connecting copper bars at both ends are electrically connected to the BDU module and the electrical connector respectively.

[0005] In some embodiments, the diversion aluminum bar and the external connecting copper bar are connected by welding.

[0006] In some embodiments, the diversion aluminum bar includes a main body portion and two connecting portions disposed at both ends of the main body portion along the X direction. The main body portion is located above the battery pack, and the connecting portions are used for connecting to the external connecting copper bars. The connecting portions are bent towards the side of the battery pack and are disposed at a 90-degree angle to the main body portion.

[0007] In some embodiments, along the Z direction, the thickness range of the diversion aluminum bar is 0.3 mm - 0.8 mm.

[0008] In some embodiments, a hot-pressed film is provided on the surface of the diversion aluminum row, and the thickness range of the hot-pressed film is 0.1 mm - 0.3 mm.

[0009] In some embodiments, the hot-pressed film is a PET film.

[0010] In some embodiments, the battery pack further includes a CCS component, which is disposed between the battery pack and the diversion aluminum row, electrically connected to the battery pack, and connected to the diversion aluminum row.

[0011] In some embodiments, the CCS component is adhesively connected to the hot-pressed film.

[0012] In some embodiments, the CCS component includes a busbar and two support frames disposed at both ends of the length direction of the busbar along the X direction. Guide posts are provided on the support frames, and the guide posts pass through the diversion aluminum row and the hot-pressed film.

[0013] In some embodiments, injection holes are provided on the diversion aluminum row.

[0014] In summary, the battery pack provided by the present utility model has the following technical effects:

[0015] The BDU module and the electrical connector are conducted through the diversion aluminum row. Since the density of the diversion aluminum row (2.7 g / cm 3 ) is much smaller than the density of the connecting copper row in the prior art (8.9 g / cm 3 ), approximately 1 / 3 of that of the copper row. Therefore, under the same overcurrent condition, a diversion aluminum row with a larger width along the Y direction can be set, making full use of the space of the battery pack along the Y direction. Since the diversion aluminum row can have a larger width in the Y direction, the diversion aluminum row can have greater strength and can be directly supported by the battery pack, and the setting of the support structure along the X direction can be cancelled. In this way, by cancelling the support structure, the height occupied along the Z direction of the battery pack is avoided, the height of the entire battery pack along the Z direction is reduced, the space utilization rate inside the box is improved, and the density of the aluminum material is smaller, which can reduce the weight of the battery pack. At the same time, since the aluminum material has the characteristic of lower price compared with the copper material, the use of the diversion aluminum row can reduce the use cost, that is, reduce the assembly cost of the entire battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a top view of a battery pack according to an embodiment in the prior art;

[0017] Figure 2 is Figure 1 the front view of the battery pack in

[0018] Figure 3The front view of a battery pack according to another embodiment in the prior art;

[0019] Figure 4 The top view of the battery pack according to the embodiment of the present invention;

[0020] Figure 5 is Figure 4 the front view of the battery pack in

[0021] Figure 6 The structural schematic diagram of the connection row structure and the CCS component according to the embodiment of the present invention;

[0022] Figure 7 is Figure 6 the enlarged schematic diagram at position II in

[0023] Figure 8 is Figure 6 the structural schematic diagram of the diversion aluminum row and the heat pressing film in

[0024] Figure 9 is Figure 6 the structural schematic diagram of the connection row structure in

[0025] Figure 10 is Figure 9 the enlarged schematic diagram at position II in

[0026] Attached drawings: 100 - battery pack, 10 - box body, 20 - battery group, 30 - BDU module, 40 - electrical connector, 50 - diversion aluminum row, 511 - glue injection hole, 512 - main body part, 513 - connection part, 52 - external copper row, 53 - heat pressing film, 60 - CCS component, 61 - support frame, 611 - guide post, 62 - input row, 63 - output row, 64 - bus bar, 200 - battery pack, 210 - connection copper row, 10 - box body, 20 - battery group, 30 - BDU module, 40 - electrical connector. Detailed implementation manners

[0027] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.

[0028] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention 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 should not be construed as a limitation to the present invention.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this utility model belongs. The terms used in the description of this utility model herein are for the purpose of describing specific embodiments only and are not intended to limit this utility model.

[0030] The following further describes this utility model in detail with reference to the accompanying drawings.

[0031] Please refer to Figure 1 and Figure 2 which shows a connection method of the BDU module 30 and the electrical connector 40 of the battery pack 200 in the prior art. Figure 1 is a top view of the battery pack 200, Figure 2 and is a front view of the battery pack 200. Among them, the connecting copper bar 210 is arranged above the battery pack 20 along the X direction to electrically connect the BDU modules 30 and the electrical connectors 40 at both ends of the battery pack 20. Since the density of the connecting copper bar 210 is relatively large, it is necessary to design a copper bar with a smaller width along the Y direction to avoid excessive increase in the weight of the battery pack 200. At the same time, due to the small width of the connecting copper bar 210 and a certain extension length, a problem of collapse in the middle area occurs. Therefore, it is necessary to set a support structure along the X direction in the box body 10 to support the connecting copper bar 210 through the support structure. In this way, since the support structure will occupy the height along the Z direction, it will ultimately lead to an increase in the height of the battery pack 200 along the Z direction;

[0032] Please refer to Figure 3 which shows another connection method of the BDU module 30 and the electrical connector 40 of the battery pack 200 in the prior art. Figure 3 is a front view of the battery pack 200. In this method, the connecting copper bar 210 is arranged on both sides of the battery pack 20 along the Y direction. However, in this connection method, when the vehicle is collided, external foreign objects may invade the connecting copper bar 210 along the side of the box body 10, causing the insulation layer on the outer surface of the connecting copper bar 210 to fail, and then resulting in contact between the connecting copper bar 210 and the box body 10, thereby causing high-voltage insulation failure and further leading to safety problems.

[0033] To solve the above problems, please refer to Figures 4 to 10 A battery pack 100 provided by an embodiment of this application includes a box body 10, a battery pack 20, a BDU module 30, an electrical connector 40, and a diversion aluminum bar 50.

[0034] Among them, Figure 4 is a top view of the battery pack 100 of this application, Figure 5This is the front view of the battery pack 100. The box body 10 serves as the installation foundation for the battery pack 20, the BDU module 30, the electrical connector 40, and the diversion aluminum bar 50. The battery pack 20 is arranged inside the box body 10 and includes a plurality of battery cells arranged side by side in the X direction. The BDU module 30 is arranged inside the box body 10 and is used for high-voltage distribution, disconnection, and short-circuit protection of the battery system. The electrical connector 40 is arranged inside the box body 10 and is electrically connected to the battery pack 20 and the BDU module 30 respectively, and is used to achieve electrical conduction with the external circuit. Among them, the electrical connector 40 and the BDU module 30 are arranged at opposite ends of the battery pack 20 in the X direction. The diversion aluminum bar 50 straddles above the battery pack 20 in the X direction and is electrically connected to the BDU module 30 and the electrical connector 40 respectively.

[0035] For the above-mentioned battery pack 100, by setting the conduction mode of the BDU module 30 and the electrical connector 40 to be conducted through the diversion aluminum bar 50, since the density of the diversion aluminum bar 50 (2.7 g / cm 3 ) is much smaller than the density of the connecting copper bar in the prior art (8.9 g / cm 3 ), approximately 1 / 3 of that of the copper bar. Therefore, under the same overcurrent condition, by setting the diversion aluminum bar 50 with a larger width in the Y direction, the space of the battery pack 100 in the Y direction can be fully utilized. Since the diversion aluminum bar 50 can have a larger width in the Y direction, the diversion aluminum bar 50 can have greater strength and can be directly supported by the battery pack 20, and the setting of the support structure in the X direction can be cancelled. In this way, by cancelling the support structure, the height occupied in the Z direction of the battery pack 100 can be avoided, the height of the entire battery pack 100 in the Z direction can be reduced, the space utilization rate inside the box body 10 can be improved, and the density of the aluminum material is smaller, which can reduce the weight of the battery pack 100. At the same time, since the aluminum material has the characteristic of lower price compared with the copper material, using the diversion aluminum bar 50 can reduce the use cost, that is, reduce the assembly cost of the entire battery pack 100.

[0036] Among them, please refer to Figure 9 and Figure 10 . In order to facilitate the electrical connection with the BDU module 30 and the electrical connector 40 respectively, the battery pack 100 further includes two external copper bars 52 arranged at both ends of the diversion aluminum bar 50 in the X direction. The diversion aluminum bar 50 straddles above the battery pack 20 in the X direction, and the external copper bars 52 at both ends are electrically connected to the BDU module 30 and the electrical connector 40 respectively. In this way, since the copper bar has a greater overcurrent capacity after current confluence, the external copper bars 52 are used to make electrical connections with the BDU module 30 and the electrical connector 40 respectively.

[0037] Please refer to Figure 9 and Figure 10, which is a schematic structural diagram of the diversion aluminum row 50 according to an embodiment of the present invention. For the convenience of connecting with the external copper row 52 and adapting to the shape of the CCS component 60, the diversion aluminum row 50 includes a main body portion 512 and two connecting portions 513 provided at both ends of the main body portion 512 along the X direction. The connecting portion 513 is used to connect with the external copper row 52. The connecting portion 513 is bent toward the side of the battery pack 20 and is disposed at a 90-degree angle with the main body portion 512, that is, the end of the diversion aluminum row 50 is bent so that the diversion aluminum row 50 can extend toward the battery pack 20, and the end of the diversion aluminum row 50 is disposed on the side of the battery pack 20, thereby facilitating the subsequent assembly of the entire battery pack 100.

[0038] Specifically, one connecting portion 513 of this embodiment is L-shaped, and one connecting portion 513 is plate-shaped to adapt to the installation of the BDU and the electrical connector 40 on the side of the battery pack 20.

[0039] Among them, the diversion aluminum row 50 of this embodiment is welded to the external copper row 53, for example, welded by ultrasonic welding or laser welding.

[0040] It can be understood that, please refer to Figure 6 , the battery pack 100 further includes a CCS component 60. The CCS component 60 is disposed between the battery pack 20 and the diversion aluminum row 50, is electrically connected to the battery pack 20, and is connected to the connection row structure 50.

[0041] Among them, the CCS component 60 includes two support frames 61, a bus bar 64 extending along the X direction, and an input row 62 and an output row 63 provided at both ends of the bus bar 64 along the X direction. The input row 62 and the output row 63 are respectively connected to one support frame 61. The bus bar 64 is used to be electrically connected to the battery pack 20 to realize the series-parallel connection of the battery cells in the battery pack 20. The input row 62 and the output row 63 are respectively used to input and output current.

[0042] Among them, when setting the diversion aluminum row 50, since the aluminum row will be electrically connected to the CCS component or the battery, for the sake of safety, a hot-pressing film 53 is provided on the surface of the diversion aluminum row 50 to electrically insulate the diversion aluminum row 50 from the CCS component, the battery or the components through the hot-pressing film 53.

[0043] Please refer to Figure 8 , the hot-pressing film 53 of this embodiment includes upper and lower layers. The upper and lower layers of the hot-pressing film 53 are disposed on the upper and lower sides of the diversion aluminum row 50. When connecting the CCS component 60 and the diversion aluminum row 50, the hot-pressing film 53 in the diversion aluminum row 50 is connected to the CCS component 60. In this way, by setting the hot-pressing film 53, the electrical insulation between the diversion aluminum row 50 and the bus bar 64 is realized, thereby ensuring the stability of the battery pack 100 during use; at the same time, by connecting the hot-pressing film 53 to the CCS component 60, the installation position of the diversion aluminum row 50 is fixed.

[0044] Furthermore, the hot-pressing film 53 in this embodiment is set as a PET hot-pressing film.

[0045] Among them, the thickness range of the diversion aluminum row 50 and the hot-pressing film 53 in this embodiment is 0.5 mm - 1.0 mm, so that the thicknesses of the diversion aluminum row 50 and the hot-pressing film 53 are set within an appropriate range, avoiding excessive increase in the thickness along the Z direction; at the same time, through this thickness setting, there is a large selection space for setting the thickness of the diversion aluminum row 50 to ensure the current-carrying capacity of the diversion aluminum row 50.

[0046] Among them, the total thickness of the diversion aluminum row 50 and the hot-pressing film 53 can be set to values such as 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm or 1.0 mm, which is not limited here.

[0047] Specifically, the thickness range of the diversion aluminum row 50 in this embodiment is 0.3 mm - 0.8 mm. In this way, the diversion aluminum row 50 has a certain thickness, and the width of the diversion aluminum row 50 along the Y direction will not be set too large, so as to have a certain structural strength and ensure that the diversion aluminum row 50 has a certain current-carrying capacity.

[0048] Among them, the thickness of the diversion aluminum row 50 can be set to values such as 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm or 0.8 mm, which is not limited here.

[0049] Furthermore, the thickness range of the hot-pressing film 53 is 0.1 mm - 0.3 mm, so that the total thickness range of the entire diversion aluminum row 50 and the two layers of hot-pressing film 53 is kept within the thickness range of 0.5 mm - 1.0 mm. In this way, the entire diversion aluminum row 50 will not have a relatively high height along the Z direction, avoiding occupying more space in the Z direction by the entire diversion aluminum row 50. At the same time, by setting the hot-pressing film 53, compared with the prior art when using a copper row for electrical connection, since a heat shrinkable tube with a thickness of about 1 mm is required to support the connecting copper row, the height of the entire battery pack 100 along the Z direction is reduced by setting the diversion aluminum row 50 and the hot-pressing film 53 in this embodiment.

[0050] Among them, when the thickness of the hot-pressing film 53 is set to 0.1 mm and the diversion aluminum row 50 is set to 0.3 mm, the thickness of the entire diversion aluminum row 50 is 0.5 mm at this time; when the hot-pressing film 53 is set to 0.2 mm and the diversion aluminum row 50 is set to 0.5 mm, the thickness of the entire diversion aluminum row 50 is 0.9 mm at this time, still lower than the thickness of the 1 mm heat shrinkable tube in the prior art, thus achieving the effect of reducing the height of the entire battery pack 100 along the Z direction.

[0051] Furthermore, since the CCS component 60 is provided with two support frames 61 along the X direction, the hot-pressing film 53 is adhesively connected to the CCS component 60. Specifically, the hot-pressing film 53 is adhesively connected to the support frames 61, thereby fixing the position of the diversion aluminum row 50.

[0052] Please refer to Figure 7 , in an embodiment of the present utility model, when installing the diversion aluminum row 50, the support frame 61 is provided with guide posts 611. The guide posts 611 pass through the diversion aluminum row 50 and the hot-pressing film 53. In this way, by setting the guide posts 611, the installation position of the diversion aluminum row 50 can be positioned first, so that the installation position of the diversion aluminum row 50 is determined, which is convenient for subsequent gluing to fix the hot-pressing film 53 and the support frame 61.

[0053] Among them, the diversion aluminum row 50 of this embodiment is provided with glue injection holes 511. Through the arrangement of the glue injection holes 511, glue can be directly injected into the glue injection holes 511, thereby fixing the installation position of the diversion aluminum row 50, avoiding shaking and causing wear or electrical conduction with other components during subsequent use, so as to ensure the safety of the battery pack 100 during use.

[0054] The technical means disclosed in the solution of the present utility model are not limited to the technical means disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present utility model.

Claims

1. Battery pack (100), characterized in that, Comprising: A box body (10); A battery pack (20), disposed within the box body (10); A BDU module (30), disposed within the box body (10) and electrically connected to the battery pack (20); An electrical connector (40), disposed within the box body (10) and electrically connected to the battery pack (20) and the BDU module (30) respectively. Among them, the electrical connector (40) and the BDU module (30) are disposed at opposite ends of the battery pack (20) along the X direction; A diversion aluminum bar (50), spanning above the battery pack (20) along the X direction and electrically connected to the BDU module (30) and the electrical connector (40) respectively.

2. The battery pack (100) according to claim 1, characterized in that, The battery pack (100) further includes two external connection copper bars (52) disposed at both ends of the diversion aluminum bar (50), and the two external connection copper bars (52) at both ends are electrically connected to the BDU module (30) and the electrical connector (40) respectively.

3. The battery pack (100) according to claim 2, wherein, The diversion aluminum bar (50) and the external connection copper bar (52) are connected by welding.

4. The battery pack (100) according to claim 2 or 3, characterized in that, The diversion aluminum bar (50) includes a main body portion (512) and two connection portions (513) disposed at both ends of the main body portion (512) along the X direction. The main body portion (512) is located above the battery pack (20), and the connection portions (513) are used for connecting to the external connection copper bar (52). The connection portions (513) are bent towards the side of the battery pack (20) and are disposed at a 90-degree angle to the main body portion (512).

5. The battery pack (100) according to any one of claims 1-3, characterized in that, Along the Z direction, the thickness range of the diversion aluminum bar (50) is 0.3 mm - 0.8 mm.

6. The battery pack (100) according to claim 5, wherein, A hot-pressed film (53) is provided on the surface of the diversion aluminum bar (50), and the thickness range of the hot-pressed film (53) is 0.1 mm - 0.3 mm.

7. The battery pack (100) according to claim 6, characterized in that, The hot-pressed film (53) is a PET film.

8. The battery pack (100) according to claim 6 or 7, characterized in that, The battery pack (100) further includes a CCS component (60), and the CCS component (60) is disposed between the battery pack (20) and the diversion aluminum bar (50), electrically connected to the battery pack (20), and connected to the diversion aluminum bar (50).

9. The battery pack (100) according to claim 8, characterized in that, The CCS component (60) and the hot-pressed film (53) are adhesively connected.

10. The battery pack (100) according to claim 8, characterized in that, The CCS component (60) includes a bus bar (64) and two support frames (61) disposed at both ends of the length direction of the bus bar (64) along the X direction. Guide posts (611) are provided on the support frames (61), and the guide posts (611) penetrate through the diversion aluminum bar (50) and the hot-pressed film (53).

11. The battery pack (100) according to any one of claims 1-3, characterized in that, Injection holes (511) are provided on the diversion aluminum bar (50).

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