Power battery pack

Abstract

The utility model provides a power battery pack. The power battery pack comprises a lower shell, a battery module and a BDU, wherein the lower shell is provided with a module cavity and an electrical cavity; the battery module is accommodated in the module cavity; a front-drive high-voltage connector and a PTC high-voltage connector are arranged at the front end of the lower shell, and a quick-charge high-voltage connector, a rear-drive high-voltage connector and an OBC high-voltage connector are arranged at the rear end of the lower shell; the BDU comprises a first BDU and a second BDU, the first BDU is connected with the total positive electrode of the battery module, the front-drive high-voltage connector and the PTC high-voltage connector, the second BDU is connected with the total negative electrode of the battery module, the fast-charge high-voltage connector and the rear-drive high-voltage connector, and the OBC high-voltage connector is connected to a rear-drive high-voltage copper bar, connected with the rear-drive high-voltage connector, of the second BDU through a wire harness. According to the power battery pack, the high-voltage and low-voltage connection length can be shortened, the length of a high-voltage wire harness can also be shortened, and the occupied space of the wire harness is reduced, so that the space utilization rate of the whole pack can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy battery packs, in particular to a power battery pack. Background Art

[0002] Different modules in the power battery pack require module sampling assemblies and low-voltage wiring harnesses to transmit the voltage and temperature signals of the battery cells in real time. For battery packs with smaller space, the space for module arrangement is removed, leaving less space. For battery packs composed of lithium iron phosphate cells, the module sampling assemblies are mostly designed to be arranged on both sides of the module, and the module sampling assemblies are connected to the low-voltage wiring harness. If there are many battery cell strings and both sides of the module plug-in are arranged, the wiring harness design will be complicated and there will be many plug-in connections, which will not only take up space but also increase the error rate of assembly in the trial and mass production stages. The layout of its wiring harness and plug-in cannot meet the requirements of ternary batteries. In addition, for systems with complex high-voltage architectures, the design difficulty of the battery distribution box will also be greatly increased, and the integrated battery distribution box design cannot meet the requirements in a limited space. Therefore, it is necessary to design a new layout of electrical parts to improve the space utilization of the battery pack. Utility Model Content

[0003] In view of this, the utility model aims to provide a power battery pack to improve the space utilization of the entire pack.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] A power battery pack, characterized in that:

[0006] It includes a lower housing having a module cavity and an electrical cavity, a battery module accommodated in the module cavity, and a BDU accommodated in the electrical cavity;

[0007] The front end of the lower shell is provided with a front drive high-voltage connector and a PTC high-voltage connector, and the rear end of the lower shell is provided with a fast-charge high-voltage connector, a rear drive high-voltage connector and an OBC high-voltage connector, and the rear drive high-voltage connector is located between the high-voltage connector and the OBC high-voltage connector;

[0008] The BDU includes a first BDU and a second BDU arranged side by side, the first BDU is connected to the total positive pole of the battery module, the front drive high-voltage connector and the PTC high-voltage connector, the second BDU is connected to the total negative pole of the battery module, the fast charge high-voltage connector and the rear drive high-voltage connector, and the OBC high-voltage connector is connected in parallel to the rear drive high-voltage copper bus connecting the second BDU and the rear drive high-voltage connector through a high-voltage wiring harness.

[0009] Furthermore, a module end plate is provided in the lower shell, and the module end plate extends along the front-to-rear direction of the lower shell and separates the cavity in the lower shell into the module cavity and the electrical cavity; the battery module is fixed to the module end plate by module bolts.

[0010] Furthermore, a BMS main board and a BMS slave board are provided in the electrical cavity, and the BMS main board and the BMS slave board are fixed on the side beams of the lower shell in a vertical state.

[0011] Furthermore, the battery module has a plurality of battery packs arranged side by side along the front-to-back direction of the lower shell, a module sampling assembly is provided above each of the battery packs, and one end of each of the module sampling assemblies away from the battery module is connected to the BMS slave board.

[0012] Furthermore, a low-voltage connector is provided at the rear end of the lower shell; the low-voltage connector is located between the fast-charging high-voltage connector and the rear-drive high-voltage connector, and the low-voltage connector is connected to the BMS slave board through a low-voltage wiring harness.

[0013] Furthermore, a liquid cooling plate and a bottom protective plate are provided at the bottom of the battery module; the liquid cooling plate is adhesively connected to the battery module, and the bottom protective plate is located below the liquid cooling plate and connected to the lower shell.

[0014] Furthermore, the battery module is bonded to the liquid cooling plate by means of a heat-conducting structural adhesive.

[0015] Furthermore, the liquid inlet and the liquid outlet of the liquid cooling plate are arranged at the front end of the lower shell.

[0016] Furthermore, explosion-proof valves are provided on two opposite side beams of the lower shell.

[0017] Furthermore, an upper cover body is provided on the lower shell body, and the upper cover body is sealedly connected to the lower shell body.

[0018] Compared with the prior art, the utility model has the following advantages:

[0019] The power battery pack described in the utility model can reduce the space requirement of the battery pack in the X direction (left and right direction) by setting a split BDU. For a battery pack with more high-voltage interfaces, it can greatly improve the space utilization rate and shorten the length of the high-voltage and low-voltage connections. Moreover, the OBC high-voltage connector is connected to the rear-drive high-voltage copper bus through a high-voltage wiring harness, so that the OBC high-voltage connector is connected in parallel with the rear-drive high-voltage connector, that is, the high-voltage wiring harness is fixed on the copper bus of other high-voltage circuits. This can also shorten the length of the high-voltage wiring harness and reduce the space occupied by the wiring harness, thereby improving the space utilization rate of the entire package and having a good use effect.

[0020] In addition, the module end plate can separate the cavity in the lower shell into the module cavity and the electrical cavity, which is convenient for the separate arrangement of the battery module and the electrical components, and the arrangement of the module end plate is also conducive to the fixation of the battery module. The BMS main board and the BMS slave board are fixed on the side beams of the lower shell in a vertical state. On the one hand, it can save space in the left and right directions of the battery pack, making the layout more reasonable, and on the other hand, it is also conducive to ensuring the fixing effect of the BMS main board and the BMS slave board. The module sampling assembly can collect the voltage and temperature of each battery cell in the battery pack.

[0021] In addition, the setting of the liquid cooling plate can perform heat exchange on the battery module, so that the battery module is in a better working environment, and the setting of the bottom guard plate is conducive to better protection of the liquid cooling plate. The battery module is bonded to the liquid cooling plate by using a thermally conductive structural adhesive. The good thermal conductivity of the thermally conductive structure can be used to improve the heat dissipation effect of the battery module. The liquid inlet and outlet of the liquid cooling plate are arranged at the front end of the lower shell, located on the outside of the battery pack, which can effectively prevent the coolant from leaking inside the battery pack. Explosion-proof valves are provided on the two opposite side beams of the lower shell to better suppress thermal runaway of the battery pack. The upper cover body is sealed and connected to the lower shell, which is conducive to ensuring the airtightness inside the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0023] Figure 1 An exploded view of a power battery pack according to an embodiment of the present utility model;

[0024] Figure 2 This is a rear view of the power battery pack according to an embodiment of the utility model;

[0025] Figure 3 This is a front view of the power battery pack according to an embodiment of the utility model;

[0026] Figure 4 This is a schematic structural diagram of a power battery pack according to an embodiment of the present utility model without a cover installed;

[0027] Figure 5 A top view of the power battery pack according to an embodiment of the present utility model without the cover installed;

[0028] Description of reference numerals:

[0029] 1. Lower housing; 2. Battery module; 11. Front drive high voltage connector; 12. PTC high voltage connector; 13. Fast charge high voltage connector; 14. Rear drive high voltage connector; 15. OBC high voltage connector; 16. Low voltage connector; 17. BMS main board; 18. BMS slave board; 19. Explosion-proof valve; 21. Total positive electrode; 22. Total negative electrode; 31. First BDU; 32. Second BDU;

[0030] 10. Front drive high-voltage copper busbar; 20. Rear drive high-voltage copper busbar; 30. Low-voltage wiring harness; 40. High-voltage wiring harness; 50. Sealing ring; 60. Pressure strip; 70. Liquid inlet; 80. Liquid outlet. DETAILED DESCRIPTION

[0031] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0032] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are 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 cannot be understood as limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0033] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "connector" 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 a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0034] In the description of the utility model, it should be noted that the directional terms such as "up, down, left, right, front, and back" used in the present embodiment are defined based on the up-down direction, left-right direction, and front-back direction of the automobile. Among them, the up-down direction of the automobile is also the height direction of the automobile, the front-back direction of the automobile is also the length direction of the automobile, and the left-right direction of the automobile is also the width direction of the automobile.

[0035] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0036] The present embodiment relates to a power battery pack, which can improve the space utilization of the entire pack.

[0037] In terms of overall structure, Figures 1 to 5 As shown, the power battery pack of this embodiment includes a lower shell 1 having a module cavity and an electrical cavity, a battery module 2 accommodated in the module cavity, and a BDU accommodated in the electrical cavity.

[0038] Among them, the front end of the lower shell 1 is provided with a front-wheel drive high-voltage connector 11 and a PTC high-voltage connector 12, and the rear end of the lower shell 1 is provided with a fast-charging high-voltage connector 13, a rear-wheel drive high-voltage connector 14 and an OBC high-voltage connector 15. The rear-wheel drive high-voltage connector 14 is located between the high-voltage connector and the OBC high-voltage connector 15.

[0039] The BDU includes a first BDU31 and a second BDU32 arranged side by side. The first BDU31 is connected to the total positive pole 21 of the battery module 2, the front drive high-voltage connector 11 and the PTC high-voltage connector 12. The second BDU32 is connected to the total negative pole 22 of the battery module 2, the fast charging high-voltage connector 13 and the rear drive high-voltage connector 14. The OBC high-voltage connector 15 is connected to the rear drive high-voltage copper bus 20 connecting the second BDU32 and the rear drive high-voltage connector 14 through a high-voltage wiring harness 40.

[0040] At this time, as in the above structure, the BDU uses a split first BDU31 and a second BDU32, which can reduce the space requirement of the battery pack in the X direction (left and right direction). For battery packs with more high-voltage interfaces, it can greatly improve the space utilization and shorten the length of high-voltage and low-voltage connections. In addition, the OBC high-voltage connector 15 is connected to the rear-drive high-voltage copper bus 20 through the high-voltage wire harness 40, so that the OBC high-voltage connector 15 is connected in parallel with the rear-drive high-voltage connector 14, that is, the high-voltage wire harness 40 is fixed on the copper bus of other high-voltage circuits, thereby shortening the length of the high-voltage wire harness 40 and reducing the space occupied by the wire harness, thereby improving the space utilization of the entire package.

[0041] In detail, based on the above overall structure, continue to refer to Figures 1 to 5 As shown, in this embodiment, as a preferred implementation, the first BDU31 and the second BDU32 are arranged side by side along the front and rear directions of the battery pack, so that the corresponding connection between the high-voltage electrical connectors at the front and rear ends of the lower shell 1 and the first BDU31 and the second BDU32 can be facilitated, and the length of the high-voltage and low-voltage connections can be shortened.

[0042] Moreover, the front drive high voltage connector 11 and the PTC high voltage connector 12 are respectively connected to the first BDU 31 through the front drive high voltage copper bus 10, and the fast charge high voltage connector 13 and the rear drive high voltage connector 14 are respectively connected to the second BDU 32 through the rear drive high voltage copper bus 20.

[0043] In this embodiment, a module end plate is provided in the lower housing 1, and the module end plate extends in the front-to-back direction of the lower housing 1, and separates the cavity in the lower housing 1 into a module cavity and an electrical cavity. The battery module 2 is fixed to the module end plate by module bolts. The module end plate can separate the cavity in the lower housing 1 into a module cavity and an electrical cavity, and facilitates the separate arrangement of the battery module 2 and the electrical components, and the provision of the module end plate is also conducive to the fixation of the end of the battery module 2.

[0044] As a preferred implementation, in this embodiment, a BMS main board 17 and a BMS slave board 18 are also provided in the electrical cavity, and the BMS main board 17 and the BMS slave board 18 are fixed in a vertical state on the side beam of the lower housing 1. Among them, the BMS main board 17 is used to analyze and make decisions on the data in the battery pack and is connected to the vehicle end through a low-voltage communication connector, and the BMS slave board 18 is used to sample the voltage and temperature of the battery cells in the battery pack.

[0045] In this embodiment, by fixing the BMS main board 17 and the BMS slave board 18 in a vertical state on the side beams of the lower shell 1, on the one hand, the space in the left and right directions of the battery pack can be saved, making the layout more reasonable, and on the other hand, it is also conducive to ensuring the fixing effect of the BMS main board 17 and the BMS slave board 18.

[0046] The battery module 2 of this embodiment has a plurality of battery packs arranged side by side along the front-to-back direction of the lower housing 1, and a module sampling assembly is provided above each battery pack, and one end of each module sampling assembly away from the battery module 2 is connected to the BMS slave board 18. The arrangement of each module sampling assembly can collect the voltage and temperature of each cell in the corresponding battery pack.

[0047] See also Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, in this embodiment, a low-voltage connector 16 is also provided at the rear end of the lower shell 1, and the low-voltage connector 16 is specifically located between the fast-charging high-voltage connector 13 and the rear-drive high-voltage connector 14, and the low-voltage connector 16 is connected to the BMS slave board 18 through a low-voltage wiring harness 30. In addition, in this embodiment, a liquid cooling plate and a bottom guard plate are provided at the bottom of the battery module 2. The liquid cooling plate is adhesively connected to the battery module 2, and the bottom guard plate is located below the liquid cooling plate and connected to the lower shell 1. At this time, the battery module 2 can be heat exchanged through the provided liquid cooling plate, so that the battery module 2 is in a better working environment. The provision of the bottom guard plate is conducive to better protection of the liquid cooling plate.

[0048] In specific implementation, the battery module 2 is bonded to the liquid cooling plate by a heat-conducting structural adhesive. In this way, the good heat conductivity of the heat-conducting structure can be utilized to improve the heat dissipation effect of the battery module 2. In addition, as a preferred embodiment, the liquid inlet 70 and the liquid outlet 80 of the liquid cooling plate are arranged at the front end of the lower shell 1. In this way, the liquid inlet 70 and the liquid outlet 80 are located outside the battery pack, thereby effectively preventing the coolant from leaking inside the battery pack.

[0049] See 2. Figure 3 and Figure 5 In this embodiment, explosion-proof valves 19 are provided on two opposite side beams of the lower housing 1. Specifically, two explosion-proof valves 19 are provided at intervals on the rear side beam of the lower housing 1, and one explosion-proof valve 19 is provided on the front side beam of the lower housing 1. At this time, the explosion-proof valves 19 provided on the side beams on both sides can better suppress thermal runaway of the battery pack.

[0050] It is worth noting that the number of explosion-proof valves 19 arranged on the two opposite side beams of the lower shell 1, in addition to being set to two on one side and one on the other side, can also be set to any other number. In this embodiment, there is no restriction on the number of explosion-proof valves 19, and it can be set accordingly according to actual needs.

[0051] In addition, in this embodiment, an upper cover is provided on the lower shell 1, and the upper cover is sealed and connected to the lower shell 1. This is conducive to ensuring the airtightness in the battery pack. In a specific implementation, for example, a sealing ring 50 is provided between the upper cover and the lower shell 1. In order to improve the structural strength and connection reliability of the connection between the upper cover and the lower shell 1, a pressure strip 60 is provided on the upper cover.

[0052] The power battery pack of this embodiment can not only shorten the length of the high-voltage and low-voltage connections, but also shorten the length of the high-voltage wire harness 40, reducing the space occupied by the wire harness, thereby improving the space utilization of the entire pack and having a good use effect.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A power battery pack, characterized in that: It includes a lower housing having a module cavity and an electrical cavity, a battery module accommodated in the module cavity, and a BDU accommodated in the electrical cavity; The front end of the lower shell is provided with a front drive high-voltage connector and a PTC high-voltage connector, and the rear end of the lower shell is provided with a fast-charge high-voltage connector, a rear drive high-voltage connector and an OBC high-voltage connector, and the rear drive high-voltage connector is located between the high-voltage connector and the OBC high-voltage connector; The BDU includes a first BDU and a second BDU arranged side by side, the first BDU is connected to the total positive pole of the battery module, the front drive high-voltage connector and the PTC high-voltage connector, the second BDU is connected to the total negative pole of the battery module, the fast charge high-voltage connector and the rear drive high-voltage connector, and the OBC high-voltage connector is connected to the rear drive high-voltage copper bus connecting the second BDU and the rear drive high-voltage connector through a high-voltage wiring harness.

2. The power battery pack according to claim 1, characterized in that: A module end plate is provided in the lower shell, and the module end plate extends along the front-rear direction of the lower shell, and separates the cavity in the lower shell into the module cavity and the electrical cavity; The battery module is fixed to the module end plate by module bolts.

3. The power battery pack according to claim 1, characterized in that: A BMS main board and a BMS slave board are arranged in the electrical cavity, and the BMS main board and the BMS slave board are fixed on the side beams of the lower shell in a vertical state.

4. The power battery pack according to claim 3, characterized in that: The battery module has a plurality of battery packs arranged side by side along the front-to-back direction of the lower shell, a module sampling assembly is provided above each of the battery packs, and one end of each of the module sampling assemblies away from the battery module is connected to the BMS slave board.

5. The power battery pack according to claim 3, characterized in that: A low-voltage connector is provided at the rear end of the lower housing; The low-voltage connector is located between the fast-charging high-voltage connector and the rear-drive high-voltage connector, and the low-voltage connector is connected to the BMS slave board through a low-voltage wiring harness.

6. The power battery pack according to claim 1, characterized in that: The bottom of the battery module is provided with a liquid cooling plate and a bottom guard plate; The liquid cooling plate is bonded to the battery module, and the bottom guard plate is located below the liquid cooling plate and is connected to the lower shell.

7. The power battery pack according to claim 6, characterized in that: The battery module is bonded to the liquid cooling plate by a heat-conducting structural adhesive.

8. The power battery pack according to claim 6, characterized in that: The liquid inlet and the liquid outlet of the liquid cooling plate are arranged at the front end of the lower shell.

9. The power battery pack according to claim 1, characterized in that: Explosion-proof valves are provided on two opposite side beams of the lower shell.

10. The power battery pack according to any one of claims 1 to 9, characterized in that: An upper cover body is arranged on the lower shell body, and the upper cover body is sealedly connected to the lower shell body.

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