Battery pack, power device and energy storage device

Abstract

The utility model provides a battery pack, a power device and an energy storage device, and the battery pack comprises a battery module and an electrical module, the battery module comprises a first shell, a battery cell group arranged in the first shell, and an immersion liquid filled in the first shell, and the immersion liquid at least immerses the battery cell group; the electrical module comprises a second shell arranged at the front end of the first shell and a BDU arranged in the second shell, and the BDU is electrically connected with the battery cell group. The battery pack disclosed by the utility model is not only beneficial to realizing convenient maintenance and replacement of the BDU and platform design of the battery pack, but also beneficial to realizing rapid cooling, improving the cooling effect on the battery core group and meeting the requirements of high-power charging and discharging working conditions, so that the battery pack has a better using effect.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery pack. At the same time, the utility model also relates to a power device provided with the battery pack, and an energy storage device provided with the battery pack. Background Art

[0002] Currently, existing battery packs are increasingly being cooled using liquid cooling. This cooling method requires the use of water-cooling plates installed on the bottom, top, or side of the module. Cooling liquid is also delivered to the flow channels of the water-cooling plates through the vehicle's cooling system. When the battery pack's BMS (Battery Management System) detects that the internal temperature of the battery pack is about to exceed a threshold, it activates the cooling system to cool the battery pack.

[0003] However, the above cooling method still has the problem of low heat dissipation efficiency and inability to quickly remove heat. As the power of the entire vehicle and the charging power increase, the battery pack will continue to release large currents. Then the temperature of the battery pack will rise too quickly, and the cooling system will not be able to remove the heat in time, which will affect the cycle life of the battery pack.

[0004] In addition, since the existing battery pack contains electrical components such as the battery distribution box assembly (Battery Disconnect Unit, BDU) and BMS, there are also problems such as the difficulty in platformization of the battery pack, the difficulty in replacing the BDU and BMS, and the difficulty in maintenance. There is even a risk of damaging the entire battery pack during maintenance, which is not conducive to after-sales and cost reduction. Utility Model Content

[0005] In view of this, the present invention aims to provide a battery pack to improve cycle life and ease of maintenance.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the utility model is achieved as follows:

[0007] A battery pack includes a battery module and an electrical module;

[0008] The battery module includes a first shell, a battery cell group disposed in the first shell, and an immersion liquid filled in the first shell, wherein the immersion liquid at least immerses the battery cell group;

[0009] The electrical module includes a second shell provided at the front end of the first shell, and a BDU provided in the second shell, and the BDU is electrically connected to the battery cell group.

[0010] Furthermore, an interface component is provided on the first shell, and the interface component is used to input or output the immersion liquid.

[0011] Furthermore, a liquid inlet interface and a liquid outlet interface are respectively provided at the front and rear ends of the first shell; the liquid inlet interface is used to transport the immersion liquid into the first shell, and the liquid outlet interface is used to output the immersion liquid in the first shell.

[0012] Furthermore, the electrical module includes a BMS arranged in the second shell, and a BDU communication connector and a vehicle communication connector arranged on the second shell; the BMS is connected to the BDU communication connector, the vehicle communication connector and the BDU.

[0013] Furthermore, the BMS and the BDU communication connector, the BMS and the vehicle communication connector, and the BMS and the BDU are all connected via a wiring harness or FPC.

[0014] Furthermore, the electrical module includes a BDU high-voltage connector and a vehicle high-voltage connector provided on the second shell, and the BDU high-voltage connector is connected to the vehicle high-voltage connector through the BDU; a battery-end low-voltage connector and a battery-end high-voltage connector are provided on the first shell, and the battery-end low-voltage connector and the BDU communication connector, as well as the battery-end high-voltage connector and the BDU high-voltage connector are connected through wiring harnesses or plug-ins.

[0015] Furthermore, the battery-end low-voltage connector includes a first connector shell and a first terminal provided on the first connector shell, and the first terminal is injection-molded integrally with the first connector shell; and / or, the battery-end high-voltage connector includes a second connector shell and a second terminal provided on the second connector shell, and the second terminal is injection-molded integrally with the second connector shell.

[0016] Furthermore, there are multiple battery cell groups, and adjacent battery cell groups are connected through conductive bars.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] The battery pack described in the present invention can separate the BDU from the battery module by separating the battery module and the electrical module, which helps to achieve convenient maintenance and replacement of the BDU and platform design of the battery pack. At the same time, filling the battery module with immersion liquid is conducive to rapid cooling, improving the cooling effect of the battery cell group, and meeting the requirements of high-power charging and discharging conditions, thereby making the battery pack have a better cycle life and convenient maintenance.

[0019] Secondly, the liquid inlet and outlet interfaces are located at the front and rear ends of the first shell, facilitating the circulation of the immersion liquid and improving its utilization rate. The first terminal of the battery-side low-voltage connector is integrally injection-molded with the first connector shell, and the second terminal of the battery-side high-voltage connector is integrally injection-molded with the second connector shell. This helps ensure the molding quality of the battery-side low-voltage connector and the battery-side high-voltage connector, and ensures the sealing between the battery-side low-voltage connector, the battery-side high-voltage connector and the first shell, thereby ensuring that the immersion liquid does not flow out along the battery-side low-voltage connector or the battery-side high-voltage connector.

[0020] In addition, the present invention also provides a power device, in which the battery pack as described above is provided.

[0021] In addition, the present invention also provides an energy storage device, in which the battery pack described above is configured.

[0022] The power device, energy storage device and the above-mentioned battery pack described in the present invention have the same beneficial effects as traditional technologies, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 This is a schematic diagram of the overall structure of the battery pack according to an embodiment of the present utility model;

[0025] Figure 2 This is a structural diagram of the electrical module according to an embodiment of the present utility model;

[0026] Figure 3 This is a schematic structural diagram of the battery-side low-voltage connector according to an embodiment of the present utility model;

[0027] Description of reference numerals:

[0028] 1. Battery module; 11. First housing; 12. Cell assembly; 13. Liquid inlet port; 14. Liquid outlet port; 15. Battery-side low-voltage connector; 151. First connector housing; 152. First terminal; 16. Battery-side high-voltage connector;

[0029] 2. Electrical module; 21. Second housing; 22. BDU; 23. BMS; 24. BDU communication connector; 25. Vehicle communication connector; 26. BDU high-voltage connector; 27. Vehicle high-voltage connector;

[0030] 3. Conductive bus; 4. Wiring harness. DETAILED DESCRIPTION

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

[0032] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," and "outer" appear to indicate orientation or positional relationships, these are based on the orientation or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the device or component 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 utility model. Furthermore, if terms such as "first" and "second" appear, they are used solely for descriptive purposes and should not be construed as indicating or implying relative importance.

[0033] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "mounted," "connected," "connection," and "connector" should be interpreted broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0034] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0035] Example 1

[0036] This embodiment relates to a battery pack, which not only facilitates the platform design of the battery pack, but also can achieve rapid cooling of the battery cell group 12 while reducing the use of water cooling plates, meeting the requirements of high-power charging and discharging conditions, thereby helping to improve the cycle life of the battery pack and control costs.

[0037] In terms of overall structure, Figures 1 to 3 As shown, the battery pack of this embodiment includes a battery module 1 and an electrical module 2. The battery module 1 includes a first housing 11, a battery cell group 12 disposed within the first housing 11, and an immersion liquid filled in the first housing 11, with the immersion liquid at least submerging the battery cell group 12. The electrical module 2 includes a second housing 21 disposed at the front end of the first housing 11, and a battery handling unit (BDU) 22 disposed within the second housing 21. The first housing 11 and the second housing 21 are spaced apart, and the BDU 22 is electrically connected to the battery cell group 12.

[0038] Specifically, in this embodiment, as an exemplary structure, Figure 1As shown, an interface component is provided on the first shell 11 , and the interface component is used to input or output the immersion liquid to facilitate the flow of the immersion liquid and ensure the heat dissipation effect inside the battery module 1 .

[0039] In specific implementation, as a preferred implementation form, in this embodiment, a liquid inlet interface 13 and a liquid outlet interface 14 are respectively provided at the front and rear ends of the first shell 11. The liquid inlet interface 13 is used to transport immersion liquid into the first shell 11, and the liquid outlet interface 14 is used to output the immersion liquid in the first shell 11.

[0040] Here, the liquid inlet interface 13 and the liquid outlet interface 14 are respectively provided at the front and rear ends of the first housing 11 , which can facilitate the circulation of the immersion liquid and improve the utilization rate of the immersion liquid, thereby improving the heat dissipation efficiency.

[0041] In addition, in this embodiment, as a preferred implementation form, Figure 2 As shown, the electrical module 2 includes a BMS 23 disposed in the second housing 21, and a BDU communication connector 24 and a vehicle communication connector 25 disposed on the second housing 21. The BMS 23 is connected to the BDU communication connector 24, the vehicle communication connector 25 and the BDU 22.

[0042] It can be understood that integrating BMS23 and BDU22 can not only avoid the risk of BMS23 being corroded by immersion liquid when it is set in the battery module 1, but also improve the rationality of the layout of BMS23 and BDU22, as well as the convenience of maintenance of BMS23.

[0043] Furthermore, in this embodiment, as a preferred implementation form, the BMS23 and the BDU communication connector 24, the BMS23 and the vehicle communication connector 25, and the BMS23 and the BDU22 are all connected through a wiring harness 4 or an FPC (Flexible Printed Circuit).

[0044] In specific implementation, using a wiring harness 4 connection is more conducive to cost reduction, and using an FPC connection is conducive to reducing space occupation and ensuring connection reliability. Moreover, it should be noted that the BMS23 here mainly refers to the BMS23 motherboard.

[0045] In addition, in this embodiment, as a preferred implementation form, Figure 2 As shown, the electrical module 2 includes a BDU high-voltage connector 26 and a vehicle high-voltage connector 27 provided on the second housing 21 , and the BDU high-voltage connector 26 is connected to the vehicle high-voltage connector 27 through the BDU 22 .

[0046] In addition, a battery-end low-voltage connector 15 and a battery-end high-voltage connector 16 are provided on the first shell 11, and the battery-end low-voltage connector 15 and the BDU communication connector 24, as well as the battery-end high-voltage connector 16 and the BDU high-voltage connector 26 are connected by a wiring harness 4 or a plug-in.

[0047] Of course, when the battery-end low-voltage connector 15 and the BDU communication connector 24, as well as the battery-end high-voltage connector 16 and the BDU high-voltage connector 26 are plugged in, that is, in a plug-in connection form, better connection reliability can be achieved.

[0048] Considering the overall sealing requirements of the battery pack of this embodiment, as a preferred implementation form, Figure 3 As shown, the battery-end low-voltage connector 15 includes a first connector housing 151 and a first terminal 152 provided on the first connector housing 151 . The first terminal 152 and the first connector housing 151 are integrally injection-molded.

[0049] This helps ensure the molding quality of the battery-end low-voltage connector 15 and the sealing between the battery-end low-voltage connector 15 and the first shell 11 , thereby ensuring that the immersion liquid does not flow out along the battery-end low-voltage connector 15 .

[0050] At the same time, considering the sealing performance between the battery end high-voltage connector 16 and the first shell 11 in this embodiment, as a preferred implementation form, it includes a second connector shell, and a second terminal provided on the second connector shell, and the second terminal and the second connector shell are integrally injection molded.

[0051] The benefit of such an arrangement is that the battery-end high-voltage connector 16 can be cooled by the immersion liquid, so that a high-voltage connector with a smaller current specification than the conventional one can be used to reduce costs.

[0052] Of course, in this embodiment, the number of battery-end low-voltage connectors 15 can be set and adjusted according to actual information collection requirements. For example, the number of battery-end low-voltage connectors 15 is specifically set to two to meet the collection requirements of the voltage and temperature signals of each battery cell in the battery cell group 12.

[0053] In addition, in this embodiment, the number of vehicle high-voltage connectors 27 can be set and adjusted according to the needs of the overall high-voltage circuit. For example, the battery-end low-voltage connector 15 is specifically set to at least one to meet the high-voltage charging and discharging requirements.

[0054] In addition, in this embodiment, as a preferred implementation form, continue to refer to Figure 1As shown, there are multiple cell groups 12, and adjacent cell groups 12 are connected by conductive bars 3. In this embodiment, the conductive bars 3 can be common copper bars or aluminum bars, and if necessary, an anti-corrosion coating can be applied on the conductive bars 3 to prevent corrosion by the immersion liquid.

[0055] It is worth mentioning that the battery pack of this embodiment is preferably installed on an electric vehicle, and all structures not mentioned in the battery pack can refer to common battery pack products in the prior art. For example, the BDU communication connector 24 is connected to the battery-end low-voltage connector 15 on the battery pack, the BDU high-voltage connector 26 is connected to the battery-end high-voltage connector 16 on the battery pack, the battery pack high-voltage connector is connected to the conductive bar 3 to transmit the electric energy of the battery module 1 to the BDU22 through the BDU high-voltage connector 26, and the BDU22 is connected to the high-voltage system circuit of the whole vehicle through the whole vehicle high-voltage connector 27, etc.

[0056] To elaborate, the electric energy obtained by the BDU high-voltage connector 26 is connected to the vehicle high-voltage connector 27 through internally arranged relays, fuses and other high-voltage electrical components. The BMS23 mainboard is used to control the on and off of the relay to realize the on and off of the connection circuit between the BDU high-voltage connector 26 and the vehicle high-voltage connector 27, thereby ensuring the safety of providing electric energy to the entire vehicle.

[0057] In addition, the battery-end low-voltage connector 15 is connected to the battery cell group 12 through an acquisition component (commonly known to those skilled in the art as an acquisition harness 4 or an FPC acquisition component) in the first shell 11. The BMS23 mainboard is used to process the voltage and temperature signals of each battery cell transmitted through the battery-end low-voltage connector 15, and transmit the battery pack status information to the entire vehicle.

[0058] It should still be mentioned that in this embodiment, the selection of the BDU communication connector 24, the BDU high-voltage connector 26, the vehicle high-voltage connector 27 and the vehicle communication connector 25 needs to ensure that the BDU22 meets the sealing requirements of at least IP67 or IP6K9K level, and even needs to meet the IP68 waterproof and dustproof performance requirements to ensure the safety of the electrical module 2.

[0059] Furthermore, the BDU22 and the connectors of the battery pack (between the low-voltage connector 15 at the battery end and the BDU communication connector 24, and between the high-voltage connector 16 at the battery end and the BDU high-voltage connector 26) can be connected through high and low-voltage wiring harnesses 4, or through plug-in connectors. Among them, the connection method using wiring harness 4 makes it easier to fix the BDU22 in a position where the entire vehicle can be fixed, without being subject to local space limitations.

[0060] The battery pack of this embodiment can separate the battery module 1 and the electrical module 2 to achieve separation of the BDU 22 from the battery module 1, which helps to achieve convenient maintenance and replacement of the BDU 22 and a platform design of the battery pack. At the same time, filling the battery module 1 with immersion liquid is conducive to rapid cooling, improving the cooling effect of the battery cell group 12, and meeting the requirements of high-power charging and discharging conditions, thereby enabling the battery pack to have a better cycle life and convenient maintenance.

[0061] Example 2

[0062] This embodiment relates to a power device, in which the battery pack of embodiment 1 is provided. At the same time, this embodiment also relates to an energy storage device, in which the battery pack of embodiment 1 is also provided.

[0063] The power device and energy storage device of this embodiment, by providing the battery pack of the first embodiment, are not only convenient for maintenance but also have a long cycle life, thus having a good use effect.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A battery pack, characterized in that: including a battery module and an electrical module; The battery module comprises a first shell, a battery cell group disposed in the first shell, and an immersion liquid filled in the first shell, wherein the immersion liquid at least immerses the battery cell group; The electrical module includes a second shell disposed at the front end of the first shell, and a BDU disposed in the second shell, and the BDU is electrically connected to the battery cell group.

2. The battery pack according to claim 1, characterized in that: An interface component is disposed on the first shell, and the interface component is used for inputting or outputting the immersion liquid.

3. The battery pack according to claim 2, characterized in that: The front and rear ends of the first shell are respectively provided with a liquid inlet interface and a liquid outlet interface; The liquid inlet interface is used to transport the immersion liquid into the first shell, and the liquid outlet interface is used to output the immersion liquid in the first shell.

4. The battery pack according to claim 1, characterized in that: The electrical module includes a BMS disposed in the second housing, and a BDU communication connector and a vehicle communication connector disposed on the second housing; The BMS is connected to the BDU communication connector, the vehicle communication connector and the BDU.

5. The battery pack according to claim 4, characterized in that: The BMS and the BDU communication connector, the BMS and the vehicle communication connector, and the BMS and the BDU are all connected via a wiring harness or an FPC.

6. The battery pack according to claim 4, characterized in that: The electrical module comprises a BDU high-voltage connector and a vehicle high-voltage connector provided on the second housing, wherein the BDU high-voltage connector is connected to the vehicle high-voltage connector via the BDU; The first shell is provided with a battery-end low-voltage connector and a battery-end high-voltage connector, and the battery-end low-voltage connector and the BDU communication connector, as well as the battery-end high-voltage connector and the BDU high-voltage connector are connected via a wiring harness or a plug-in.

7. The battery pack according to claim 6, characterized in that: The battery-end low-voltage connector comprises a first connector housing and a first terminal provided on the first connector housing, wherein the first terminal and the first connector housing are integrally injection-molded; and / or, The battery-end high-voltage connector comprises a second connector housing and a second terminal disposed on the second connector housing, wherein the second terminal is integrally injection-molded with the second connector housing.

8. The battery pack according to any one of claims 1 to 7, characterized in that: There are multiple battery cell groups, and adjacent battery cell groups are connected via conductive bars.

9. A power device, characterized in that: The power device is provided with a battery pack according to any one of claims 1 to 8.

10. An energy storage device, characterized in that: The energy storage device is provided with a battery pack according to any one of claims 1 to 8.

Images