Modular battery pack device with side liquid cooling structure

Abstract

The utility model discloses a modularization battery PACK device adopts side surface liquid cooling heat dissipation structure, including PACK base, battery module, square lithium iron phosphate battery cell monomer, integration side surface liquid cooling plate, cooling liquid import and export, internal flow channel, heat conduction filling layer, side plate locking mechanism, liquid cooling pipeline, external water nozzle and connecting copper bar, through the direct adhesion of integration side surface liquid cooling plate big side surface of battery cell monomer, eliminate interface thermal resistance in combination with heat conduction filling layer, realize battery cell temperature difference is less than or equal to 3 DEG C, through the bolt of side plate locking mechanism provides controllable pressure force, effectively compensates battery cell charge -discharge expansion, maintains long -term thermal contact stability.

Description

Technical Field

[0001] This utility model belongs to the field of battery energy storage technology, specifically relating to a modular battery PACK device with a side liquid cooling heat dissipation structure. Background Technology

[0002] The current liquid-cooled energy storage battery packs mainly suffer from three types of technical defects: (1) In the bottom liquid cooling scheme, the cooling plate is located at the bottom of the cell, and the long heat transfer path leads to a cell temperature difference of >8℃, which accelerates capacity decay; and the overall packaging design requires destructive disassembly for single-module maintenance. (2) In the cell gap tube cooling method, the cooling tube occupies the module space, which significantly reduces the energy density; there is a risk of leakage in the multi-pipe joints, and the replacement of a single cell is complicated. (3) Traditional liquid cooling pipelines lack effective insulation, and condensate is easy to corrode electrical compartment components; some solutions attempt to solve this through external drainage pipes, but introduce new leakage points.

[0003] The industry bottleneck lies in the fact that existing technologies cannot simultaneously meet the requirements of short thermal path, high maintainability, and system flexibility. Therefore, it is necessary to provide a new modular side-cooled liquid-cooled battery energy storage PACK device to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a modular battery pack device with a side liquid cooling structure, featuring direct side liquid cooling, modular quick-change structure, and integrated flow channels; the liquid cooling plate is directly attached to the side of the battery cell, resulting in an extremely short heat transfer path and achieving a cell temperature difference of ≤3℃; the detachable side plate locking mechanism supports quick replacement of single modules; and the built-in S-shaped flow channel completely reduces leakage risk points; thus solving the problems existing in the prior art.

[0005] To solve the above problems, the technical solution provided by this utility model is as follows:

[0006] This utility model embodiment provides a modular battery PACK device with a side liquid cooling heat dissipation structure, including a PACK base (201) and multiple battery modules (101) installed on the PACK base (201), with the multiple battery modules (101) connected in series by connecting copper busbars (801);

[0007] The battery module (101) includes multiple square lithium iron phosphate cells (102) arranged in a matrix; an insulating buffer silicone pad (101a) is attached between two adjacent square lithium iron phosphate cells (102); PC insulating sheets (101b) and aluminum end plates (101c) are provided at both ends of the battery module (101) and are fixed by binding steel straps (101d); a CCS component (101f) integrating voltage and temperature acquisition is installed on the battery module (101); and a PC insulating sheet (101g) is attached to the top of the battery module (101).

[0008] The PACK device has an integrated side liquid cooling plate (301) arranged on both the right and left sides. The integrated side liquid cooling plate (301) integrates a coolant inlet and outlet (302) and an internal flow channel (303). The internal flow channel (303) has an S-shaped structure. A thermally conductive filling layer (401) is provided between the battery cell (102) and the liquid cooling plate (301).

[0009] The front side of the PACK device is provided with an external water nozzle (701) and a liquid cooling pipe (601). The external water nozzle (701) serves as the main coolant inlet and outlet of the PACK device. The liquid cooling pipe (601) is used to connect the coolant inlet and outlet (302) and the external water nozzle (701) in a dual-loop pipeline. The surface of the liquid cooling pipe (601) is covered with thermal insulation cotton.

[0010] An optional embodiment of this utility model further includes a battery module locking mechanism (202), which locks and fixes the battery module (101) to the PACK base (201) by means of a first bolt (203).

[0011] An optional embodiment of this utility model further includes a side plate locking mechanism (501), which uses a second bolt (502) to press and fix the integrated side liquid cooling plate (301) to the end plate on the side of the PACK device.

[0012] In an optional embodiment of the present invention, the front panel (901) of the PACK device is a sheet metal panel for mounting electrical components (1001), and a first silicone sealing gasket (901a) is attached to the location where the electrical components (1001) are fixed.

[0013] In an optional embodiment of this utility model, the liquid-cooled top cover (1101) of the PACK device is used to cover the sheet metal protective cover plate on the top of the PACK, and a second silicone sealing gasket (1101a) is attached to the fixed sheet metal protective cover plate.

[0014] In an optional embodiment of this utility model, the battery module (101) includes 13 280Ah square lithium iron phosphate cells (102), the insulating buffer silicone pad (101a) is 1.3mm thick and has a flame retardant rating of V0, the tension of the binding steel strap (101d) is ≥300kgf, and the CCS component (101f) is connected to the cell terminals of the battery module (101) by laser welding.

[0015] Compared with the prior art, the present invention provides a modular battery pack device with a side liquid cooling structure, which has the following advantages:

[0016] (1) Breakthrough improvement in thermal management performance: The integrated side liquid cooling plate is directly attached to the large side of the battery cell, and the thermally conductive filling layer eliminates the interface thermal resistance. The heat transfer path is extremely short, and the temperature difference of the battery cell is ≤2℃, which is significantly reduced compared with the traditional solution. At the same time, the bolts of the side plate locking mechanism provide controllable clamping force, which can effectively compensate for the expansion of the battery cell during charging and discharging and maintain long-term thermal contact stability.

[0017] (2) Fundamental innovation in maintenance efficiency: The battery module locking mechanism and the side plate locking mechanism work together to support the replacement of a single module in 10 minutes, completely solving the problem of traditional PACK overall disassembly; and the MSD manual maintenance switch and the detachable copper busbar form a dual maintenance channel, improving maintenance convenience.

[0018] (3) Comprehensive upgrade of safety and reliability: The surface of the liquid cooling pipeline is covered with insulation cotton and combined with the fully sealed interface to completely prevent condensate water from corroding electrical components; the composite detector monitors the temperature / smoke in real time and links the fire nozzles and explosion-proof valves to form a three-level protection of "early warning-suppression-pressure relief" to improve safety.

[0019] (4) System integration and cost advantages: Eliminating the bottom cold plate or gap cooling pipe increases the PACK volume energy density by 5%-10%; the external water nozzle is the only external interface, reducing installation costs by 40%. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of a modular battery pack device with a side liquid cooling structure, provided as an embodiment of this application.

[0022] Figure 2This is a schematic diagram of the structure of a battery module provided in an embodiment of this application.

[0023] Figure 3 This is a schematic diagram of an integrated side liquid cooling plate provided in an embodiment of this application.

[0024] Figure 4 This is a schematic diagram of four battery modules in a modular battery PACK device with a side liquid cooling structure, provided as an embodiment of this application.

[0025] Figure 5 This is a schematic diagram of the rear internal structure of a modular battery PACK device with a side liquid cooling heat dissipation structure, provided as an embodiment of this application.

[0026] Figure 6 This is a front view of a modular battery pack device with a side liquid cooling structure, provided as an embodiment of this application. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The terms "upper," "lower," "front," "rear," "left," and "right," etc., used when describing the installation position or direction of the structure or components in this embodiment are based on the orientation shown in the accompanying drawings. They are merely for convenience of description, used to distinguish the relative positions of various components or directions, and do not represent the orientation of the device or functional component in this embodiment during use.

[0028] like Figures 1-6 As shown, this embodiment of the utility model provides a modular battery PACK device with a side liquid cooling structure, including a PACK base 201 and multiple battery modules 101 mounted on the PACK base 201. The multiple battery modules 101 are connected in series via connecting copper busbars 801. In this embodiment, the PACK base 201 is a sheet metal welded support platform, fixed to the bottom of the PACK device.

[0029] The battery module 101 includes multiple square lithium iron phosphate cells 102 arranged in a matrix; an insulating buffer silicone pad 101a is attached between two adjacent square lithium iron phosphate cells 102; PC insulating sheets 101b and aluminum end plates 101c are provided at both ends of the battery module 101 and are fixed by binding steel straps 101d; a CCS component 101f integrating voltage and temperature acquisition is installed on the battery module 101; and a PC insulating sheet 101g is attached to the top of the battery module 101.

[0030] An integrated side liquid cooling plate 301 is arranged on both the right and left sides of the PACK device. The integrated side liquid cooling plate 301 integrates a coolant inlet and outlet 302 and an internal flow channel 303. The internal flow channel 303 has an S-shaped structure. A thermally conductive filling layer 401 is provided between the battery cell 102 and the liquid cooling plate 301. The thermally conductive filling layer 401 is a thermally conductive silicone layer.

[0031] The front side of the PACK unit is equipped with an external water inlet 701 and a liquid cooling pipe 601. The external water inlet 701 serves as the main coolant inlet and outlet of the PACK unit. The liquid cooling pipe 601 is a dual-loop pipe connecting the coolant inlet / outlet 302 and the external water inlet 701. The surface of the liquid cooling pipe 601 is covered with insulation cotton. The interface of the liquid cooling pipe 601 adopts a radial seal.

[0032] The PACK device also includes a battery module locking mechanism 202, which locks the battery module 101 to the PACK base 201 using a first bolt 203. The PACK device also includes a side plate locking mechanism 501, which presses and fixes the integrated side liquid cooling plate 301 to the end plate on the side of the PACK device using a second bolt 502. The integrated side liquid cooling plate 301 is made of aluminum alloy.

[0033] The battery module 101 includes 13 square lithium iron phosphate cells 102 with a capacity of 280Ah, an insulating buffer silicone pad 101a with a thickness of 1.3mm and a flame retardant rating of V0, a ​​binding steel strap 101d with a tension of ≥300kgf, and a CCS module 101f connected to the cell terminals of the battery module 101 by laser welding.

[0034] The liquid-cooled top cover 1101 of the PACK device is used to cover the sheet metal protective cover plate on the top of the PACK, and a second silicone sealing gasket 1101a is attached to the sheet metal protective cover plate.

[0035] The front panel 901 of the PACK unit is a sheet metal panel for mounting electrical components 1001, and a first silicone sealing gasket 901a is affixed to the location where the electrical components 1001 are fixed. The electrical components 1001 include a BMS mainboard 1001a, a communication connector 1001b, a fire nozzle 1001c, an MSD manual maintenance switch 1001d, a composite detector 1001e, an explosion-proof valve 1001f, and positive and negative connectors 1001g. The composite detector 1001e is used for real-time monitoring of temperature and smoke.

[0036] Example 1: 166.4V / 280Ah energy storage PACK device, selected: 52 square lithium iron phosphate cells 102 with a capacity of 3.2V / 280Ah, divided into 4 modules (13 cells in series in each group); integrated side liquid cooling plate 301: aluminum alloy material, size 1021mm×205mm×6mm, internal microchannel width 15mm, depth 3mm.

[0037] An assembly method for a modular battery pack device employing a side liquid cooling heat dissipation structure is as follows:

[0038] Step 1: Battery module 101 assembly. Select 13 square lithium iron phosphate cells 102 (207mm×174mm×40mm) and arrange them in a matrix. Between two adjacent square lithium iron phosphate cells 102, PC insulating sheets 101b and aluminum end plates 101c are set at both ends of the battery module 101 and fixed by steel straps 101d. CCS assembly 101f is installed on the top and laser welded to the cell terminals. PC insulating sheet 101g is attached to the top.

[0039] Step 2: Apply a 1mm thick thermally conductive silicone layer 401 to the large side of the square lithium iron phosphate cell 102, with a coverage rate of ≥95%.

[0040] Step 3: Attach the integrated side liquid cooling plate 301 to both sides (left and right sides) of the battery module 101, and press and fix the integrated side liquid cooling plate 301 to the end plate using the second bolt 502. Secure the four modules with the side liquid cooling plates fixed to them by locking the battery module 101 to the PACK base 201 using the first bolt 203.

[0041] Step 4: Connect multiple battery modules 101 in series using connecting copper busbars 801. Secure the connecting copper busbars 801 and CCS assembly 101f with bolts. In this embodiment, there are four battery modules 101.

[0042] Step 5: Install liquid cooling pipe 601, connecting the integrated coolant inlet / outlet 302 to the external water nozzle 701 in a dual-loop pipeline.

[0043] Step 6: Attach the second silicone sealing gasket 1101a to the liquid-cooled top cover 1101 and secure it to the PACK base 201 with bolts.

[0044] Step 7, Electrical components 1001 are assembled. The BMS main board 1001a, communication connector 1001b, fire nozzle 1001c, MSD manual maintenance switch 1001d, composite detector 1001e, explosion-proof valve 1001f, and positive and negative connector 1001g are integrated and installed on the front panel 901 and fixed with bolts.

[0045] Step 8: Attach the first silicone sealing gasket 901a to the liquid cooling top cover 1101 at the fixing point of the front panel 901, and seal and fix it with bolts.

[0046] Performance verification: Under continuous discharge at 0.5C, the cell temperature difference in Example 1 is ≤3℃, which is 50% lower than that of the bottom liquid cooling solution.

[0047] The core innovations of this utility model are as follows:

[0048] Side-mounted liquid cooling structure: Integrated side liquid cooling plate 301 and thermally conductive filling layer 401. Innovation: The liquid cooling plate 301 directly covers the maximum heat dissipation surface (side) of the battery cell 102, shortening the heat transfer path to the millimeter level; the thermally conductive silicone layer 401 fills the interface gaps, eliminating the multi-layer thermal resistance of traditional bottom liquid cooling. Technical effect: Achieves a cell temperature difference ≤3℃ (measured data).

[0049] Modular quick-release locking system: battery module locking mechanism 202 and side plate locking mechanism 501. In essence, the first bolt 203 achieves vibration-resistant decoupling and fixing between the module 101 and the base 201; the second bolt 502 provides dynamic clamping force compensation for the liquid cooling plate 301 (adapting to cell expansion). Technical benefits: Supports single-module replacement within 10 minutes, improving maintenance efficiency by 80%.

[0050] Fully sealed anti-condensation liquid cooling circuit: liquid cooling pipe 601 and external water tap 701. Innovative aspect: The surface of the dual-circuit pipe 601 is covered with insulation cotton, actively blocking conditions for condensation formation; all liquid cooling interfaces use radial seals, ensuring zero contact between the coolant and the electrical components. Technical effect: Completely prevents condensation from corroding electrical components 1001.

[0051] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A modular battery pack device employing a side liquid cooling heat dissipation structure, characterized in that, It includes a PACK base (201) and multiple battery modules (101) mounted on the PACK base (201), with the multiple battery modules (101) connected in series via connecting copper busbars (801); The battery module (101) includes multiple square lithium iron phosphate cells (102) arranged in a matrix; an insulating buffer silicone pad (101a) is attached between two adjacent square lithium iron phosphate cells (102); PC insulating sheets (101b) and aluminum end plates (101c) are provided at both ends of the battery module (101) and are fixed by binding steel straps (101d); a CCS component (101f) integrating voltage and temperature acquisition is installed on the battery module (101); and a PC insulating sheet (101g) is attached to the top of the battery module (101). The PACK device has an integrated side liquid cooling plate (301) arranged on both the right and left sides. The integrated side liquid cooling plate (301) integrates a coolant inlet and outlet (302) and an internal flow channel (303). The internal flow channel (303) has an S-shaped structure. A thermally conductive filling layer (401) is provided between the battery cell (102) and the liquid cooling plate (301). The front side of the PACK device is provided with an external water nozzle (701) and a liquid cooling pipe (601). The external water nozzle (701) serves as the main coolant inlet and outlet of the PACK device. The liquid cooling pipe (601) is used to connect the coolant inlet and outlet (302) and the external water nozzle (701) in a dual-loop pipeline. The surface of the liquid cooling pipe (601) is covered with thermal insulation cotton.

2. A modular battery pack device with a side liquid cooling structure according to claim 1, characterized in that, It also includes a battery module locking mechanism (202), which locks and fixes the battery module (101) to the PACK base (201) by means of a first bolt (203).

3. A modular battery pack device with a side liquid cooling structure according to claim 1, characterized in that, It also includes a side plate locking mechanism (501), which uses a second bolt (502) to press and fix the integrated side liquid cooling plate (301) to the end plate on the side of the PACK device.

4. A modular battery pack device with a side liquid cooling structure according to claim 1, characterized in that, The front panel (901) of the PACK device is a sheet metal panel for mounting electrical components (1001), and a first silicone sealing gasket (901a) is attached to the location where the electrical components (1001) are fixed.

5. A modular battery pack device with a side liquid cooling structure according to claim 1, characterized in that, The liquid-cooled top cover (1101) of the PACK device is used to cover the sheet metal protective cover plate on the top of the PACK, and a second silicone sealing gasket (1101a) is attached to the sheet metal protective cover plate.

6. The modular battery pack device with a side liquid cooling structure according to claim 1, characterized in that, The battery module (101) includes 13 square lithium iron phosphate cells (102) of 280Ah each. The insulating buffer silicone pad (101a) is 1.3mm thick and has a flame retardant rating of V0. The tension of the binding steel strap (101d) is ≥300kgf. The CCS component (101f) is connected to the cell terminals of the battery module (101) by laser welding.

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