Battery pack module

Abstract

The utility model discloses a battery pack module which comprises a box body, a plurality of single battery cells and a plurality of liquid cooling assemblies, and the plurality of single battery cells are arranged in the box body in parallel at intervals; each liquid cooling assembly comprises a support assembly and an aluminum-plastic film bag arranged on the support assembly, a single battery cell is arranged between every two adjacent support assemblies, and each aluminum-plastic film bag is attached between every two adjacent single battery cells; the aluminum-plastic film bag is communicated with a liquid inlet, a liquid outlet and a liquid outlet, the liquid inlet and the liquid outlet are used for being communicated with an external cooling liquid source to provide cooling liquid for the aluminum-plastic film bag, the liquid outlet is communicated with a cooling bag, and the cooling bag can be broken under the external action to release the cooling liquid in the aluminum-plastic film bag. According to the technical scheme, the cooling efficiency of the battery pack module can be improved, and the cost of the battery pack module cooling system is greatly reduced.

Description

Technical Field

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

[0002] With the continuous development of new energy vehicles, the demand for power batteries has increased sharply. When applying power batteries, attention should be paid to technical problems such as cooling.

[0003] In the prior art, the cooling of the battery pack module mainly adopts the liquid cooling method in the industry. Generally, an aluminum plate is attached to each single cell, and the coolant is passed into the aluminum plate flow channel of the battery pack module. By using the characteristic of the aluminum plate having high heat rate, the heat of the high-temperature single cell is taken away through the way of heat conduction. In this way, in terms of cooling efficiency, the aluminum plate has a large hardness, and the contact between the aluminum plate and the cell is incomplete, resulting in low cooling efficiency of the cell; in terms of manufacturing cost, the price of the aluminum plate in the market is high, resulting in a high manufacturing cost of the entire cooling system of the battery pack module. Summary of the Utility Model

[0004] The main purpose of the utility model is to propose a battery pack module, aiming to improve the cooling efficiency of the battery pack module and reduce the cost of the cooling system of the battery pack module.

[0005] To achieve the above purpose, the battery pack module proposed by the utility model includes:

[0006] A box body;

[0007] A plurality of single cells, and the plurality of single cells are arranged side by side at intervals in the box body;

[0008] A plurality of liquid cooling components, each of the liquid cooling components includes a bracket component and an aluminum-plastic film bag arranged on the bracket component. A single cell is arranged between two adjacent bracket components, and each aluminum-plastic film bag is attached between two adjacent single cells;

[0009] The aluminum-plastic film bag is communicated with a liquid inlet, a liquid outlet, and a liquid discharge port. The liquid inlet and the liquid outlet are used to communicate with an external coolant source to provide coolant for the aluminum-plastic film bag. A cooling bag is communicated at the liquid discharge port, and the cooling bag can be broken under the action of the outside to release the coolant in the aluminum-plastic film bag.

[0010] Preferably, the bracket component includes a first fixing bracket and a second fixing bracket. Both the first fixing bracket and the second fixing bracket are in a frame structure. The single cells are sleeved on both the first fixing bracket and the second fixing bracket, and the edge of the aluminum-plastic film bag is pressed between the first fixing bracket and the second fixing bracket.

[0011] Preferably, the materials of both the first fixing bracket and the second fixing bracket are made of plastic.

[0012] Preferably, a plurality of positioning posts are convexly provided on the first fixing bracket, and a positioning hole adapted to the positioning posts is concavely formed on the second fixing bracket, and the positioning post can extend into the positioning hole.

[0013] Preferably, a plurality of fixing holes arranged at intervals are opened at the edge of the aluminum-plastic film bag, and the positioning column can penetrate the fixing hole and extend into the positioning hole.

[0014] Preferably, the cooling bag is integrally formed by blow molding.

[0015] Preferably, the box body is made of sheet metal material.

[0016] Preferably, the battery pack module further includes a liquid inlet tube body and a liquid outlet tube body, the liquid inlet tube body is connected to each of the liquid inlets, the liquid outlet tube body is connected to each of the liquid outlets, and the liquid inlet tube body and the liquid outlet tube body are both connected by a plurality of three-way flexible joints.

[0017] Preferably, the central axis of the liquid inlet and the central axis of the liquid outlet are staggered in vertical direction.

[0018] Compared with the prior art, in terms of cooling efficiency, the technical solution of the utility model has an elastic contact between the aluminum-plastic film bag and the single battery cell, and the aluminum-plastic film bag and the single battery cell are more completely attached, so that the heat exchange efficiency between the aluminum-plastic film bag and the single battery cell is higher, and the cooling efficiency of the aluminum-plastic film bag on the single battery cell is enhanced. In terms of manufacturing cost, compared with the traditional method of using hard aluminum plates to dissipate heat from single batteries, the aluminum-plastic film bag subverts the method of using hard aluminum plates in the battery pack cooling system in the prior art, so that while the aluminum-plastic film bag ensures cooling efficiency, the manufacturing cost of the aluminum-plastic film bag is lower than that of the traditional hard aluminum plate. At the same time, the aluminum-plastic film bag is integrated with a cooling bag for emergency cooling. The emergency cooling device is easy and practical to assemble, and the cost is lower than that of the existing emergency cooling device, which achieves a significant reduction in the production cost of the entire battery pack module, and greatly reduces the cost of the cooling system of the battery pack module. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the internal structure of the battery pack module of the utility model;

[0020] Figure 2 This is a diagram showing the appearance of the battery pack module of the utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the battery pack module of the utility model with some single cells and liquid cooling components separated;

[0022] Figure 4 It is a schematic diagram of the structure of the liquid cooling assembly of the battery pack module of the utility model;

[0023] Figure 5 Explosion diagram of the liquid cooling component of the battery pack module of the present utility model;

[0024] Figure 6 Explosion diagram of the liquid cooling component of the battery pack module of the present utility model from another perspective;

[0025] Figure 7 Schematic structural diagram of the aluminum-plastic film bag of the battery pack module of the present utility model;

[0026] Figure 8 Schematic structural diagram of the cooling bag in the battery pack module of the present utility model;

[0027] Figure 9 is Figure 1 Schematic structural diagram after removing the single cell;

[0028] Figure 10 is Figure 9 Schematic structural diagram after removing the bracket assembly;

[0029] Figure 11 Schematic structural diagram of the liquid inlet pipe body and the liquid outlet pipe body in the battery pack module of the present utility model.

[0030] Explanation of the reference numerals in the drawings: 100, box body; 200, single cell; 300, liquid cooling component; 400, bracket assembly; 500, aluminum-plastic film bag; 510, liquid inlet; 520, liquid outlet; 410, first fixing bracket; 420, second fixing bracket; 411, positioning column; 421, positioning hole; 501, fixing hole; 530, liquid discharge port; 600, cooling bag; 700, liquid inlet pipe body; 800, liquid outlet pipe body; 900, three-way union. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0032] Please refer to Figures 1 to 11 , the present utility model proposes a battery pack module.

[0033] The battery pack module includes a box body 100, a plurality of single cells 200, and a plurality of liquid cooling components 300. The plurality of single cells 200 are arranged side by side and spaced apart in the box body 100; each liquid cooling component 300 includes a support component 400 and an aluminum-plastic film bag 500 disposed on the support component 400. A single cell 200 is disposed between two adjacent support components 400, and each aluminum-plastic film bag 500 is attached between two adjacent single cells 200; the aluminum-plastic film bag 500 is communicated with a liquid inlet 510, a liquid outlet 520, and a liquid drain port 530. The liquid inlet 510 and the liquid outlet 520 are used to communicate with an external coolant source to provide coolant to the aluminum-plastic film bag 500. A cooling bag 600 is communicated at the liquid drain port 530, and the cooling bag 600 can be broken under an external action to release the coolant in the aluminum-plastic film bag 500.

[0034] Specifically, the edge of the aluminum-plastic film bag 500 is sealed and the main body portion can bulge to form a receiving cavity for receiving coolant. Its liquid inlet 510 and liquid outlet 520 are respectively connected to an external coolant source. Coolant is introduced into the aluminum-plastic film bag 500 through the coolant source and a circulating cooling circuit is formed to cool the single cells 200. During operation, the coolant gradually flows into the aluminum-plastic film bag 500 from the liquid inlet 510, causing the aluminum-plastic film bag 500 to gradually bulge and expand. When the coolant fills the aluminum-plastic film bag 500, the aluminum-plastic film bag 500 bulges and adheres to the single cell 200, and the coolant continuously circulates and flows, taking away the heat of the single cell 200 by means of heat conduction.

[0035] In the battery pack module of the present utility model, by connecting the cooling bag 600 to the aluminum-plastic film bag 500, when a battery thermal runaway occurs inside the battery pack module, for example: the pressure and temperature of the battery pack module suddenly increase, and rapid thermal diffusion occurs between adjacent single cells 200. At this time, personnel can actively break the cooling bag 600, and the coolant is sprayed into the single cells 200 inside the box body 100 through the broken cooling bag 600 to cool down the thermally runaway cells, reduce the heating effect of the thermally runaway cells on the adjacent batteries, delay the spread of the thermal runaway, and improve the safety of the battery pack. Of course, when the personnel do not timely detect the thermal runaway of the single cells 200 inside the battery pack, the cooling bag 600 can also be burned out by the high temperature of the thermally runaway cells, causing the coolant to be automatically sprayed out. Or, an electric heating method can also be used to burn the cooling bag 600 to break it and release the coolant.

[0036] In summary, in terms of cooling efficiency, the aluminum-plastic film bag 500 is in elastic contact with the single cell 200, and the aluminum-plastic film bag 500 fits more completely with the single cell 200, resulting in a higher heat transfer efficiency between the aluminum-plastic film bag 500 and the single cell 200, enhancing the cooling efficiency of the aluminum-plastic film bag 500 for the single cell 200. In terms of manufacturing cost, compared with the traditional method of using a rigid aluminum plate to dissipate heat from the single cell 200, the aluminum-plastic film bag 500 subverts the method of using a rigid aluminum plate in the battery pack cooling system in the prior art. While ensuring the cooling efficiency, the manufacturing cost of the aluminum-plastic film bag 500 is lower than that of the traditional rigid aluminum plate. At the same time, the aluminum-plastic film bag 500 is integrated with a cooling bag 600 for emergency cooling. This emergency cooling device is simple and practical to assemble, and its cost is lower than that of the existing emergency cooling devices, achieving a significant reduction in the manufacturing cost of the entire battery pack module and a substantial reduction in the cost of the cooling system of the battery pack module.

[0037] Please refer to Figures 4 to 6 , preferably, the bracket assembly 400 includes a first fixing bracket 410 and a second fixing bracket 420. Both the first fixing bracket 410 and the second fixing bracket 420 are in a frame structure. The single cell 200 is sleeved on both the first fixing bracket 410 and the second fixing bracket 420, and the edge of the aluminum-plastic film bag 500 is pressed between the first fixing bracket 410 and the second fixing bracket 420. Specifically, the connection between the first fixing bracket 410 and the second fixing bracket 420 can be achieved by bolt connection or by the mutual cooperation and limitation of their own structures to ensure the connection stability between the first fixing bracket 410 and the second fixing bracket 420. The shape of the aluminum-plastic film bag 500 can be square, circular, oval or other irregular shapes. In this solution, the aluminum-plastic film bag 500 is set in a similar rectangular shape. The edges of the aluminum-plastic film bag 500 can be clamped by the frames of the first fixing bracket 410 and the second fixing bracket 420 to fix the aluminum-plastic film bag 500. The first fixing bracket 410 and the second fixing bracket 420 are sleeved on the edge of the single cell 200. The single cell 200 is stuck on the fixing bracket around its perimeter, and the single cells 200 on both sides can be in contact with the aluminum-plastic film bag 500 for heat exchange.

[0038] To further save costs and reduce the production cost of the battery pack module, preferably, the materials of both the first fixing bracket 410 and the second fixing bracket 420 are made of plastic. Of course, the first fixing bracket 410 and the second fixing bracket 420 can also be produced using other materials as long as they can play a fixing role.

[0039] Please refer to Figures 5 to 6, To improve the assembly efficiency of the first fixing bracket 410 and the second fixing bracket 420, preferably, a plurality of positioning posts 411 protrude from the first fixing bracket 410, and positioning holes 421 adapted to the positioning posts 411 are recessed in the second fixing bracket 420, and the positioning posts 411 can extend into the positioning holes 421. In this way, during assembly, the first fixing bracket 410 and the second fixing bracket 420 can be pre-positioned and assembled by first inserting the positioning posts 411 into the positioning holes 421, further improving the assembly efficiency.

[0040] The method of fixing the aluminum-plastic film bag 500 between the first fixing bracket 410 and the second fixing bracket 420 can be various. Please refer to Figures 5 to 6 , preferably, a plurality of fixing holes 501 are provided at intervals at the edge of the aluminum-plastic film bag 500, and the positioning posts 411 can penetrate through the fixing holes 501 and extend into the positioning holes 421. In this way, during assembly, the fixing holes 501 on the aluminum-plastic film bag 500 can be sleeved on the positioning posts 411 on the first fixing bracket 410, and then the second fixing bracket 420 is positioned to insert the positioning posts 411 into the positioning holes 421, so that the aluminum-plastic film bag 500 is pressed between the first fixing bracket 410 and the second fixing bracket 420. Of course, in order to improve the installation stability of the aluminum-plastic film bag 500, bolts or other types of connectors can also be used to sequentially penetrate the first fixing bracket 410, the aluminum-plastic film bag 500, and the second fixing bracket 420 to complete the assembly.

[0041] Please refer to Figure 8 , preferably, the cooling bag 600 is integrally formed by blow molding. In this way, the cooling bag 600 is made of plastic material, so that the cooling liquid inside the cooling bag 600 can be sprayed out by manually puncturing the cooling bag 600 and directly contact the thermally runaway battery cell to quickly cool down. At the same time, the wall thickness of the cooling bag 600 should be made as small as possible so that the cooling bag 600 can release the cooling liquid effortlessly in a dangerous moment to extinguish the fire.

[0042] To further reduce the material cost of the battery pack module, please refer to Figure 2 , preferably, the box body 100 is made of sheet metal material.

[0043] Please refer to Figure 1 and Figure 11, preferably, the battery pack module further includes an inlet pipe body 700 and an outlet pipe body 800. The inlet pipe body 700 communicates with each inlet port 510, and the outlet pipe body 800 communicates with each outlet port 520. Both the inlet pipe body 700 and the outlet pipe body 800 are formed by connecting a plurality of three-way union joints 900. Specifically, the plurality of three-way union joints 900 in the inlet pipe body 700 are connected in sequence. An inlet main flow path and a plurality of inlet branch flow paths communicating with the inlet main flow path are formed inside the inlet pipe body 700. Each inlet branch flow path communicates with a corresponding aluminum-plastic film bag 500. When cooling liquid is introduced, the cooling liquid in the inlet main flow path is divided into each inlet branch flow path and then flows into each aluminum-plastic film bag 500 respectively to rapidly cool each single cell 200. Similarly, the plurality of three-way union joints 900 in the outlet pipe body 800 are connected in sequence. An outlet main flow path and a plurality of outlet branch flow paths communicating with the outlet main flow path are formed inside the outlet pipe body 800. Each outlet branch flow path is connected to a corresponding aluminum-plastic film bag 500. The cooling liquid in the aluminum-plastic film bag 500 enters each inlet branch flow path, converges to the outlet main flow path and then flows out. In this way, the cooling efficiency is high and the uniformity is better.

[0044] Please refer to Figure 7 , preferably, the central axis of the inlet port 510 is vertically offset from the central axis of the outlet port 520. By offsetting the inlet port 510 and the outlet port 520, for example, the inlet port 510 is located at the lower right corner of the aluminum-plastic film bag 500, and the outlet port 520 is located at the upper left corner of the aluminum-plastic film bag 500, so that the cooling liquid can fill the entire aluminum-plastic film bag 500, ensuring the heat exchange area between the cooling liquid and the aluminum-plastic film bag 500 and ensuring the cooling efficiency.

[0045] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A battery pack module, characterized in that, The battery pack module includes: A box body; A plurality of single cells, and the plurality of single cells are arranged side by side and spaced apart in the box body; A plurality of liquid cooling components, each of the liquid cooling components includes a support component and an aluminum-plastic film bag arranged on the support component. The single cells are arranged between adjacent two support components, and each aluminum-plastic film bag is attached between two adjacent single cells; The aluminum-plastic film bag is communicated with a liquid inlet, a liquid outlet, and a liquid drain port. The liquid inlet and the liquid outlet are used to communicate with an external coolant source to provide coolant for the aluminum-plastic film bag. A cooling bag is communicated at the liquid drain port, and the cooling bag can be broken under the action of the outside to release the coolant in the aluminum-plastic film bag.

2. The battery pack module according to claim 1, characterized in that, The support component includes a first fixing bracket and a second fixing bracket. Both the first fixing bracket and the second fixing bracket are in a frame structure. The single cells are sleeved on both the first fixing bracket and the second fixing bracket, and the edge of the aluminum-plastic film bag is pressed between the first fixing bracket and the second fixing bracket.

3. The battery pack module according to claim 2, wherein The materials of both the first fixing bracket and the second fixing bracket are made of plastic.

4. The battery pack module according to claim 2, wherein A plurality of positioning columns protrude from the first fixing bracket, and positioning holes adapted to the positioning columns are formed by recessing on the second fixing bracket, and the positioning columns can extend into the positioning holes.

5. The battery pack module according to claim 4, wherein A plurality of fixing holes are formed at intervals at the edge of the aluminum-plastic film bag, and the positioning columns can penetrate through the fixing holes and extend into the positioning holes.

6. The battery pack module according to claim 1, wherein, The cooling bag is formed by blow molding in one piece.

7. The battery pack module according to claim 1, wherein, The box body is made of sheet metal material.

8. The battery pack module according to claim 1, characterized in that, The battery pack module further includes an inlet pipe body and an outlet pipe body. The inlet pipe body communicates with each liquid inlet, and the outlet pipe body communicates with each liquid outlet. Both the inlet pipe body and the outlet pipe body are composed of a plurality of three-way union joints connected.

9. The battery pack module according to claim 1, characterized in that, The central axes of the liquid inlets and the central axes of the liquid outlets are arranged in a vertically staggered manner.

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