A liquid-cooled battery module based on magnetic force buffering

Abstract

The application discloses a kind of liquid-cooled battery module based on magnetic force buffer, it is related to energy storage equipment technical field, and its technical solution main points are: including: electric core stack, by multiple electric core sequentially stacked along stacking direction;Two end plates, respectively set in the two ends of electric core stack along stacking direction;Limiting frame, connected between two end plates, to constrain electric core stack in the space formed by limiting frame and two end plates, limiting frame is configured to allow electric core in electric core stack moves along stacking direction, and limit the movement of electric core along other directions;Plate-shaped magnet, between every two adjacent electric cores, on the two opposite faces of two adjacent electric cores respectively there is a plate-shaped magnet, and two plate-shaped magnets are arranged with same polarity, and buffer gap is formed between two plate-shaped magnets, buffer gap can be supplied with cooling fluid circulation.The application has the advantages of high heat dissipation efficiency, good structural stability, strong long-term operation reliability.

Description

Technical Field

[0001] This invention relates to the field of energy storage equipment technology, and more specifically, to a liquid-cooled battery module based on magnetic buffering. Background Technology

[0002] With the continuous improvement of battery energy density, liquid cooling technology is widely used in energy storage batteries. In a typical liquid-cooled energy storage battery, the battery module is installed inside the battery pack housing, which contains a liquid cooling circulation loop. Driven by a pump, the coolant flows over the surface of the cells in the battery module, carrying away the heat generated during charging and discharging. After being cooled by an external heat exchanger, it flows back into the battery pack housing, forming a closed-loop cooling system.

[0003] Battery modules are typically composed of multiple stacked cells with end plates at both ends. These end plates are secured by strapping steel bands to apply preload to the cell stack. During charging and discharging, the cells undergo periodic volume expansion and contraction. To absorb the expansion force, suppress vibration, and prevent cell displacement, current technologies typically fill the spaces between adjacent cells with cushioning materials such as foam or silicone foam to provide continuous elastic support.

[0004] In the aforementioned liquid-cooled battery module, the buffer material must cover a large area of ​​the cell to provide effective support. This prevents the coolant from flowing effectively across the large surface of the cell, resulting in reduced heat dissipation efficiency, increased internal temperature differences within the battery module, decreased cell performance consistency, and impact on system cycle life. If the buffer material is removed to improve heat dissipation, the expansion force of the cell has nowhere to be released, leading to problems such as excessive cell displacement, mutual compression, and loose structure in the battery module. It may even cause fatigue failure of the connecting busbar due to repeated stress.

[0005] Therefore, a new solution is needed to address this problem. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a liquid-cooled battery module based on magnetic buffering, which has the advantages of high heat dissipation efficiency, good structural stability, and strong long-term operational reliability.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is: a liquid-cooled battery module based on magnetic buffering, comprising:

[0008] A battery cell stack is composed of multiple battery cells stacked sequentially along a stacking direction.

[0009] Two end plates are respectively disposed at both ends of the battery cell stack along the stacking direction;

[0010] A limiting frame, connected between the two end plates, constrains the cell stack within the space enclosed by the limiting frame and the two end plates. The limiting frame is configured to allow movement of the cells within the cell stack along the stacking direction and restrict movement of the cells in other directions; and...

[0011] A plate magnet is provided on each of the two large surfaces of the two adjacent cells, with the same poles of the two plate magnets facing each other to generate a mutual repulsive buffering force and form a buffer gap between the two plate magnets, which allows coolant to flow.

[0012] Preferably, the limiting frame includes four retainers, which are respectively disposed at the four edges of the battery cell stack. Each retainer extends along the direction of the corresponding edge of the battery cell stack, and both ends of each retainer are fixedly connected to the two end plates.

[0013] Preferably, the plate-shaped magnet is fixed to the large surface of the battery cell by a thermally conductive adhesive layer.

[0014] Preferably, the thickness of the thermally conductive adhesive layer is 0.1mm-0.3mm, the thickness of the plate magnet is 1mm-5mm, and the spacing of the buffer gap in the stacking direction is 1mm-3mm.

[0015] Preferably, in a static state, the mutual repulsion buffer force between each pair of adjacent plate magnets is balanced with the preload force borne by the battery cell stack.

[0016] Preferably, the battery also includes multiple connecting aluminum bars, which are flexible aluminum bars. Each connecting aluminum bar is used to connect two adjacent battery cells in series. The middle part of the connecting aluminum bar has a protruding arc-shaped bending structure to accommodate the movement of the battery cells along the stacking direction.

[0017] Preferably, it also includes a CCS bracket, which is installed above the cell stack, and the upper part of the CCS bracket is provided with a data acquisition harness groove.

[0018] Preferably, the groove wall of the acquisition harness groove includes, from the inside out, an inner insulating layer, a metal shielding layer, and an outer insulating layer.

[0019] Preferably, the CCS bracket has a liquid cooling channel slit extending through it at a position corresponding to the buffer gap, so that coolant can flow into the buffer gap through the liquid cooling channel slit.

[0020] Compared with existing technologies, the advantages of the magnetically buffered liquid-cooled battery module disclosed in this invention are:

[0021] 1. By setting up plate-shaped magnets with opposite poles between each pair of adjacent cells, the magnetic repulsion generates a repulsive buffer force, which absorbs the volume expansion and contraction of the cells during charging and discharging in a non-contact manner. There is no need to fill the large surface of the cells with cushioning materials such as foam or silicone foam, which avoids the problem of permanent deformation or elastic decay of traditional cushioning materials after long-term use and improves the long-term reliability of the buffer structure.

[0022] 2. Two plate magnets are arranged with their poles facing each other, forming a natural buffer gap between them. This buffer gap is unobstructed by any material, allowing the coolant to flow directly through it and contact the surface of the plate magnets. The heat generated by the battery cell is conducted to the plate magnets via the thermally conductive adhesive layer, and then transferred to the coolant by the plate magnets. The plate magnets themselves have good thermal conductivity, enabling efficient heat transfer. This is equivalent to increasing the effective contact area between the coolant and the battery cell, which helps improve heat dissipation efficiency, reduce the internal temperature difference of the battery module, improve the temperature uniformity of the battery cell, and thus extend the cycle life of the battery module.

[0023] 3. By setting a limiting frame connected between the two end plates, the battery cell stack is constrained within the space enclosed by the limiting frame and the two end plates. The limiting frame allows the battery cells to move along the stacking direction to adapt to the expansion and contraction of the battery cells, while restricting the movement of the battery cells in other directions. This effectively prevents the battery cells from lateral displacement or scattering under vibration or impact conditions, improves the structural stability of the battery module, and reduces the risk of fatigue failure of the connecting busbar due to battery cell displacement. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of a liquid-cooled battery module based on magnetic buffering according to an embodiment of this application;

[0026] Figure 2 This is a schematic diagram of the structure of a buffer gap based on magnetic buffering according to an embodiment of this application;

[0027] Figure 3 This is a schematic diagram of the limiting frame structure according to an embodiment of this application;

[0028] Figure 4 This is a schematic diagram of the connecting aluminum busbar according to an embodiment of this application;

[0029] Figure 5This is a schematic diagram of the CCS support and liquid cooling channel slit in an embodiment of this application;

[0030] Figure 6 This is a schematic diagram of the structure of the acquisition harness groove in an embodiment of this application;

[0031] Figure 7 This is a cross-sectional view of a liquid-cooled battery module based on magnetic buffering according to an embodiment of this application;

[0032] Figure 8 for Figure 7 Enlarged view of part A in the image;

[0033] Figure 9 This is a graph showing the relationship between the buffer gap and the mutual exclusion buffer force.

[0034] The numbers or letters in the attached diagram represent the names of the corresponding components:

[0035] 1. Battery cell; 2. End plate; 3. Cage; 4. Plate magnet; 5. Bundling steel strap; 6. Buffer gap; 7. Connecting aluminum busbar; 71. Arc-shaped bending structure; 8. CCS bracket; 81. Liquid cooling channel slit; 9. Data acquisition harness slot; 91. Inner insulating layer; 92. Metal shielding layer; 93. Outer insulating layer. Detailed Implementation

[0036] The technical solution of the present invention will now be clearly and completely described through specific embodiments. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0037] Please see Figure 1 , Figure 2 and Figure 5 The embodiments of this application provide a liquid-cooled battery module based on magnetic buffering, including a cell stack, two end plates 2, a limiting frame, a plate magnet 4, a connecting aluminum busbar 7, and a CCS bracket 8.

[0038] The battery cell stack is composed of multiple square battery cells 1 stacked sequentially along the stacking direction, which is the thickness direction of the battery cell 1. Each battery cell 1 has two large surfaces, which are the two surfaces with the largest surface area of ​​the battery cell 1 and are also the main directions of volume expansion and contraction during the charging and discharging process of the battery cell 1. A gap is left between the large surfaces of two adjacent battery cells 1 to accommodate the plate magnet 4.

[0039] Two end plates 2 are respectively disposed at both ends of the cell stack along the stacking direction. The outer sides of the two end plates 2 are fitted with binding steel straps 5, which bind the two end plates 2 along the stacking direction. The binding steel straps 5 are preferably stainless steel straps.

[0040] The plate magnet 4 is a rectangular thin plate-shaped permanent magnet, preferably with a thickness of 1mm-5mm, specifically 1mm, 2mm, 3mm, 4mm, or 5mm. Between each pair of adjacent battery cells 1, a plate magnet 4 is fixed to each of the two large surfaces of the two adjacent battery cells 1 facing each other via a thermally conductive adhesive layer, and the two plate magnets 4 are arranged with the same pole facing each other. A mutual repulsive buffering force is generated between the two plate magnets 4 with the same pole facing each other, and this mutual repulsive buffering force is used to absorb the volume expansion and contraction of the battery cell 1 during charging and discharging in a non-contact manner. A buffer gap 6 is naturally formed between the two plate magnets 4 with the same pole facing each other, and the spacing of the buffer gap 6 in the stacking direction is preferably 1mm-3mm, specifically 1mm, 2mm, or 3mm. The buffer gap 6 is unobstructed by any material, allowing direct flow of coolant. As the coolant flows through the buffer gap 6, it directly contacts the surface of the plate magnet 4. Heat generated by the battery cell 1 is conducted to the plate magnet 4 via the thermally conductive adhesive layer, and then transferred to the coolant by the plate magnet 4. The plate magnet 4 itself has excellent thermal conductivity, enabling efficient heat transfer. This effectively increases the effective contact area between the coolant and the battery cell 1, improving heat dissipation efficiency, reducing the internal temperature difference of the battery module, and improving the temperature uniformity of the battery cell 1, thereby extending the cycle life of the battery module. In a static state, the mutual repulsion buffer force between any two adjacent plate magnets 4 balances the preload force borne by the battery cell stack.

[0041] It should be noted that the relationship between the buffer gap 6 formed between the two plate magnets 4 and the mutual repulsion buffer force in this embodiment can be estimated using the following empirical formula:

[0042] ,

[0043] in, The mutual repulsion buffer force is expressed in kgf, and S is the effective area of ​​the magnetic poles of the plate magnet 4. The remanence of plate magnet 4 Where is the vacuum permeability, g is the buffer gap 6, h is the thickness of the plate magnet 4, 9.8 is the gravity conversion factor, and 1 kgf ≈ 9.8 N. Although the conventional law states that the repulsive force of magnets is inversely proportional to the square of the distance, under this law, the mutual repulsive buffer force would increase sharply as the gap decreases, potentially exerting excessive additional mechanical pressure on the battery cell 1. However, this law only applies when the magnet gap is much smaller than the magnet thickness and does not consider the case where the magnet is forcibly glued to the battery cell 1. In this embodiment, both the buffer gap 6 and the thickness of the plate magnet 4 are on the order of millimeters and their values ​​are close. Therefore, the thickness of the plate magnet 4 is included in the formula for calculation. As can be seen from the formula, after taking into account the influence of the thickness of the plate magnet 4, the mutual repulsive buffer force increases slowly as the buffer gap 6 decreases. This mechanical characteristic can be well matched with the gradual volume expansion of the battery cell 1 during charging and discharging.

[0044] In one specific embodiment, cell 1 is a 314Ah lithium iron phosphate cell, with dimensions of approximately 175mm wide, 72mm thick, and 205mm high. After assembly, the initial preload of this magnetically buffered liquid-cooled battery module is approximately 300kgf, and the peak expansion force during normal charge-discharge cycles is approximately 500kgf, corresponding to an expansion displacement of approximately 1.0mm for a single cell 1. The deformation of cell 1 is mainly reversible elastic expansion. A plate magnet 4 with a thickness of 2mm and dimensions of 175mm × 205mm is selected. The plate magnet 4 is an N35H high-temperature resistant neodymium iron boron magnet with a remanence Br of approximately 1.20T and a free permeability μ0 of approximately 4π × 10⁻⁻⁴. 7 H / m. The effective area of ​​the magnetic poles of the plate magnet 4 is S = 0.175m × 0.205m = 0.035875m².

[0045] When the initial buffer gap is 3mm, substituting the above parameters into the above empirical formula yields the following result:

[0046] ,

[0047] When cell 1 expands to its peak value and buffer gap 6 shrinks to 2mm, the following calculations are made: ,

[0048] Based on the above calculations and combined with, for example Figure 9 As shown in the buffer gap-mutual repulsion buffer force relationship curve, when the buffer gap 6 is 3mm, the mutual repulsion buffer force is about 335.59kgf, which matches the initial preload force of about 300kgf. When the cell 1 expands to the peak and the buffer gap 6 shrinks to 2mm, the mutual repulsion buffer force is about 524.36kgf, which still matches the peak expansion force of about 500kgf. The force value changes gradually and there will be no sharp increase. It will not generate excessive additional mechanical pressure on the cell 1, so that the internal force of the liquid-cooled battery module based on magnetic buffer is uniform.

[0049] Furthermore, since cell 1 uses a 314Ah lithium iron phosphate cell, its normal operating temperature range is 20℃-35℃, with a peak short-term temperature of approximately 45℃. Meanwhile, the plate magnet 4 uses an N35H high-temperature resistant neodymium iron boron magnet, whose maximum safe operating temperature can reach 120℃, far exceeding the normal operating temperature of cell 1, resulting in an extremely low risk of demagnetization during long-term operation. Based on the reliability of the aforementioned magnetic buffer, the non-contact buffering solution adopted in this application eliminates the need to fill the large surfaces of cell 1 with foam or silicone foam, avoiding the problems of permanent deformation or elastic decay that occur with traditional buffering materials after long-term use, thus improving the long-term reliability of the buffer structure.

[0050] A thermally conductive adhesive layer is disposed between the plate magnet 4 and the large surface of the battery cell 1 to firmly bond and fix the plate magnet 4 to the large surface of the battery cell 1, while reducing the contact thermal resistance between the plate magnet 4 and the battery cell 1. The thermally conductive adhesive layer can be made of thermally conductive structural adhesive or thermally conductive epoxy resin, etc. The thickness of the thermally conductive adhesive layer is preferably 0.1mm-0.3mm, specifically 0.1mm, 0.2mm or 0.3mm. The thermal conductivity of the thermally conductive adhesive layer is preferably greater than 1W / (m·K), specifically 1.5W / (m·K), 2W / (m·K) or 3W / (m·K). During assembly, the thermally conductive adhesive can be applied to the surface of the plate magnet 4 or the large surface of the battery cell 1 first, and then the plate magnet 4 can be attached to the large surface of the battery cell 1. After curing, the thermally conductive adhesive layer is formed.

[0051] Please see Figure 3 The limiting frame is connected between the two end plates 2, and is used to constrain the entire battery cell stack within the space enclosed by the limiting frame and the two end plates 2. The limiting frame includes four retainers 3, which are correspondingly located at the four edges of the battery cell stack. Each retainer 3 has an L-shaped cross-section to surround the edge of the battery cell stack. Each retainer 3 extends along the corresponding edge of the battery cell stack, and both ends of each retainer 3 are fixedly connected to the two end plates 2 by threaded connectors to form a stable frame structure. The threaded connectors can be bolts. The retainers 3 are made of engineering plastics with long-term temperature resistance above 50℃, high strength, and low friction. PA66+GF (glass fiber reinforced nylon 66) material, which is relatively economical, is preferred. Its long-term operating temperature can reach above 80℃, and its tensile strength ranges from 110-140MPa, which can provide reliable structural constraints for the battery cell stack. The surface of the retainer 3 that contacts the cell 1 is constructed as a low-friction surface. The dry friction coefficient can be controlled between 0.2 and 0.35 by adding modified materials to reduce the frictional resistance when the cell 1 moves along the stacking direction, allowing the cell 1 to move smoothly along the stacking direction during charging and discharging expansion and contraction. The limiting frame is constructed to allow the cell 1 in the cell stack to move along the stacking direction to accommodate the expansion and contraction of the cell 1, while restricting the movement of the cell 1 in other directions. This effectively prevents the cell 1 from lateral displacement or scattering under vibration or impact conditions, improving the structural stability of the battery module and reducing the risk of fatigue failure of the connecting busbar due to cell 1 displacement.

[0052] Please see Figure 4 and Figure 5Multiple connecting aluminum busbars 7 are disposed above the battery cell stack. Each connecting aluminum busbar 7 is used to connect two adjacent battery cells 1 in series, thereby connecting all battery cells 1 in series. The connecting aluminum busbars 7 are flexible aluminum busbars, preferably made of 1-series aluminum alloy. 1-series aluminum alloy is relatively soft, has good plasticity, and has good fatigue resistance. A protruding arc-shaped bending structure 71 is formed in the middle of the connecting aluminum busbar 7. This arc-shaped bending structure 71 can absorb displacement through deformation when the battery cell 1 moves along the stacking direction, so as to adapt to the movement caused by the expansion of the battery cell 1, and prevent the welding point between the connecting aluminum busbar 7 and the battery cell 1 electrode from fatigue cracking or fracture failure due to alternating stress during the repeated expansion and contraction of the battery cell 1.

[0053] Please see Figure 5 The CCS bracket 8 is installed above the cell stack. CCS stands for Cell Connection System. The CCS bracket 8 is a supporting structure used to integrate and install electrical connection components such as the aluminum busbar 7 and the data acquisition harness. The upper part of the CCS bracket 8 has a data acquisition harness slot 9, which is used to accommodate and fix the data acquisition harness. The data acquisition harness is used to collect voltage and temperature signals from each cell 1 to monitor the working status of the battery module in real time. Please refer to [link / reference]. Figure 6 The wall of the acquisition harness slot 9, from the inside out, comprises an inner insulating layer 91, a metal shielding layer 92, and an outer insulating layer 93, forming a three-layer shielding structure. The metal shielding layer 92, located between the inner insulating layer 91 and the outer insulating layer 93, shields the magnetic field generated by the plate-shaped magnet 4 from electromagnetic interference to the electrical signals in the acquisition harness, ensuring the accuracy and reliability of the acquired signals and preventing misjudgments by the battery management system or distortion of the acquired data due to electromagnetic interference. Please refer to... Figure 5 , Figure 7 and Figure 8 The CCS bracket 8 has liquid cooling channel slits 81 extending through it at the corresponding buffer gaps 6. The liquid cooling channel slits 81 are spaced apart along the stacking direction, with their positions corresponding one-to-one with each buffer gap 6. Coolant can flow into the buffer gaps 6 through the liquid cooling channel slits 81. When the coolant flows through the buffer gaps 6, it directly contacts the surface of the plate magnet 4. The heat generated by the battery cell 1 is conducted to the plate magnet 4 through the thermally conductive adhesive layer, and then transferred to the coolant by the plate magnet 4, thereby achieving efficient heat dissipation over a large area of ​​the battery cell 1.

[0054] During assembly, the magnetically buffered liquid-cooled battery module first attaches plate-shaped magnets 4 to the large surfaces of each battery cell 1 using a thermally conductive adhesive layer, ensuring accurate bonding using a positioning fixture. After the thermally conductive adhesive layer cures, multiple battery cells 1 with attached plate-shaped magnets 4 are stacked sequentially onto a stacking fixture in a predetermined direction. The stacking fixture has a lateral limiting structure to ensure that the sides and bottom surfaces of each battery cell 1 are aligned, and it also has a force monitoring function. End plates 2 are placed at the front and rear ends of the battery cell stack. One end plate 2 is fixed, and a compressive force is applied to the other end plate 2. When the force monitoring shows that the compressive force has reached the initial pre-tightening force, the binding steel straps 5 are inserted into the designated positions of the two end plates 2 and locked, completing the pre-tightening binding. After binding, the retainers 3 at the four corners are installed sequentially and fixed to the two end plates 2 using threaded connectors. Subsequently, electrical components such as the CCS bracket 8 and connecting aluminum busbar 7 are installed, ultimately forming the magnetically buffered liquid-cooled battery module.

[0055] The magnetically buffered liquid-cooled battery module provided in this embodiment is placed inside a battery pack housing during installation and use. The housing is filled with coolant, which circulates under the drive of a pump. The coolant is a non-conductive liquid with good metal compatibility; specifically, perfluorononene electronic fluorinated liquid or Ecool series insulating oil can be used. This type of coolant has excellent compatibility with common metal plating on the surface of the plate magnet 4 and poses no significant corrosion risk under long-term immersion. The coolant flows into each buffer gap 6 through the liquid-cooling channel slits 81 on the CCS bracket 8, directly contacting the surface of the plate magnet 4 to remove heat, then flows out of the buffer gap 6, is cooled by an external heat exchanger, and returns to the battery pack housing, forming a closed-loop cooling system.

[0056] In summary, the liquid-cooled battery module based on magnetic buffering provided in this embodiment replaces traditional buffering materials such as foam and silicone foam with non-contact magnetic buffering by setting plate-shaped magnets 4 with opposite poles between adjacent cells 1. At the same time, a buffer gap 6 is formed to allow coolant to flow, and the cell 1 is reliably limited by a limiting frame. It has the advantages of high heat dissipation efficiency, good structural stability, and strong long-term operational reliability. It solves the technical problems of difficulty in balancing buffering and heat dissipation and insufficient lateral limiting of cell 1 in existing liquid-cooled battery modules.

[0057] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A liquid-cooled battery module based on magnetic buffering, characterized in that, include: A battery cell stack is composed of multiple battery cells stacked sequentially along a stacking direction. Two end plates are respectively disposed at both ends of the battery cell stack along the stacking direction; A limiting frame, connected between the two end plates, constrains the cell stack within the space enclosed by the limiting frame and the two end plates. The limiting frame is configured to allow movement of the cells within the cell stack along the stacking direction and restrict movement of the cells in other directions; and... A plate magnet is provided on each of the two large surfaces of the two adjacent cells, with the same poles of the two plate magnets facing each other to generate a mutual repulsive buffering force and form a buffer gap between the two plate magnets, which allows coolant to flow.

2. The liquid-cooled battery module based on magnetic buffering according to claim 1, characterized in that: The limiting frame includes four retainers, which are respectively disposed at the four edges of the battery cell stack. Each retainer extends along the corresponding edge of the battery cell stack, and both ends of each retainer are fixedly connected to the two end plates.

3. The liquid-cooled battery module based on magnetic buffering according to claim 1, characterized in that: The plate-shaped magnet is fixed to the large surface of the battery cell by a thermally conductive adhesive layer.

4. The liquid-cooled battery module based on magnetic buffering according to claim 3, characterized in that: The thickness of the thermally conductive adhesive layer is 0.1mm-0.3mm, the thickness of the plate magnet is 1mm-5mm, and the spacing of the buffer gap in the stacking direction is 1mm-3mm.

5. The liquid-cooled battery module based on magnetic buffering according to claim 1, characterized in that: In a static state, the mutual repulsion buffer force between each pair of adjacent plate magnets is balanced by the preload force borne by the battery cell stack.

6. The liquid-cooled battery module based on magnetic buffering according to claim 1, characterized in that: It also includes multiple connecting aluminum bars, which are flexible aluminum bars. Each connecting aluminum bar is used to connect two adjacent cells in series. The middle part of the connecting aluminum bar has a protruding arc-shaped bending structure to accommodate the movement of the cells along the stacking direction.

7. The liquid-cooled battery module based on magnetic buffering according to claim 1, characterized in that: It also includes a CCS bracket, which is installed above the cell stack, and the upper part of the CCS bracket is provided with a data acquisition harness groove.

8. The liquid-cooled battery module based on magnetic buffering according to claim 7, characterized in that: The wall of the acquisition harness slot consists of an inner insulating layer, a metal shielding layer, and an outer insulating layer, from the inside out.

9. The liquid-cooled battery module based on magnetic buffering according to claim 7, characterized in that: The CCS bracket has a liquid cooling channel slit extending through it at the position corresponding to the buffer gap, so that the coolant can flow into the buffer gap through the liquid cooling channel slit.

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