Battery pack

Abstract

The invention relates to the technical field of batteries, and discloses a battery pack. The battery pack comprises battery modules, cooling plates and a three-way pipe, the multiple cooling plates are arranged at intervals in the thickness direction of the battery modules, one battery module is clamped between any two adjacent cooling plates, the three-way pipe comprises a first branch pipe and a second branch pipe which are communicated, two first connecting ports are formed in the two ends of the first branch pipe respectively, and two second connecting ports are formed in the two ends of the second branch pipe respectively. One end of the second branch pipe is communicated with the first branch pipe, the first branch pipe is provided with a first telescopic pipe section, and the first telescopic pipe section is suitable for stretching out and drawing back in the thickness direction of the battery module. The first telescopic pipe section is arranged on the first branch pipe of the three-way pipe, and the first telescopic pipe section can stretch out and draw back in the thickness direction of the battery module, so that the battery pack can effectively absorb expansion deformation of the battery module in the thickness direction, extrusion and damage to the internal structure of the battery module due to expansion of the battery cells can be reduced, and the battery pack can be conveniently used. And the stability and the reliability of the battery module are ensured.

Description

Technical Field

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

[0002] As a key energy supply component of a vehicle, the performance of a battery pack directly affects the overall performance of the vehicle. A battery pack usually includes a cooling plate and a battery module composed of a plurality of battery cells. Among them, the cooling plate undertakes the important task of cooling the heat generated by the battery module, and thus plays a key role in the performance of the battery module.

[0003] In the prior art, the cooling plates of traditional battery packs are mostly on the bottom or top surface of the battery module, and the cooling surface of the battery cells is narrow. With the development of fast charging technology, the heat exchange requirements can no longer be met. Therefore, a large-area cooling solution appears, which places the cooling plate on the large surface of the battery cells to increase the cooling area and control the temperature. This solution includes a plurality of battery cells, cooling plates and connecting pipeline components, etc. However, during charging and discharging, the battery cells will expand, and the cooling plates and connecting pipeline components in the large-area cooling solution have limited ability to absorb the expansion and deformation of the battery cells, resulting in a decline in the performance of the battery cells and deformation of the cooling plates, affecting the life and thermal management performance of the battery pack. Summary of the Invention

[0004] In view of this, the present invention provides a battery pack to solve the problem that the cooling plates and connecting pipeline components have limited ability to absorb the expansion and deformation of the battery cells.

[0005] The present invention provides a battery pack, including:

[0006] At least one battery module;

[0007] A plurality of cooling plates, which are arranged at intervals along the thickness direction of the battery module. One battery module is clamped between any two adjacent cooling plates. Each cooling plate is provided with a liquid inlet and a liquid outlet;

[0008] A plurality of three-way pipes, which are arranged between two adjacent cooling plates and are respectively located on opposite sides of the cooling plates. The three-way pipe includes a first branch pipe and a second branch pipe. Two first connection ports are respectively formed at both ends of the first branch pipe. The first connection port is used to communicate with the liquid inlet or the liquid outlet. One end of the second branch pipe is communicated with the first branch pipe, and the other end forms a second connection port for communicating with an inlet pipe or an outlet pipe. A first telescopic pipe section is provided on the first branch pipe, and the first telescopic pipe section is adapted to expand and contract along the thickness direction of the battery module.

[0009] Beneficial effects: In this battery pack, multiple cooling plates are arranged at intervals along the thickness direction of the battery module. Each cooling plate is provided with a liquid inlet and a liquid outlet. The first connection port of the tee is communicated with the liquid outlet and the liquid inlet of the cooling plate, and the second connection port of the tee is connected with the liquid inlet pipe and the liquid outlet pipe, forming a relatively perfect coolant circulation system. Since a battery module is clamped between any two adjacent cooling plates, the coolant enters the tee from the liquid inlet pipe and then enters the cooling plate, where it can circulate and flow, taking away the heat generated by the battery module, making the heat exchange between the cooling plate and the battery module more efficient and uniform. At the same time, the coolant enters the cooling plate from the liquid inlet, and after heat exchange with the battery module, it flows out from the liquid outlet. During the whole process, the heat transfer path is short and direct, reducing the loss and non-uniformity during the heat transfer process.

[0010] In addition, during the charging and discharging process of the battery pack, the battery cells in the battery module will expand. By providing a first telescopic pipe section on the first branch pipe of the tee, and the first telescopic pipe section can telescope along the thickness direction of the battery module, the battery pack can effectively absorb the expansion deformation of the battery module in the thickness direction, reduce the extrusion and damage to the internal structure of the battery module caused by the expansion of the battery cells, and ensure the stability and reliability of the battery module.

[0011] In addition, while the first telescopic pipe section adapts to the expansion of the battery cells, it can also play a certain buffering role for the entire pipeline system, reducing the impact on the cooling pipeline and the battery module caused by external vibrations, impacts and other factors. When the battery pack is affected by external interference, the first telescopic pipe section can absorb and disperse stress through its own deformation, preventing problems such as loosening, leakage at the pipeline connection or displacement of the internal components of the battery module, thereby improving the overall stability and safety of the battery pack in a complex usage environment.

[0012] In an optional embodiment, a plurality of the first telescopic pipe sections are arranged at intervals on the first branch pipe, and each of the first telescopic pipe sections is adapted to telescope along the axial direction of the first branch pipe.

[0013] Beneficial effects: By coaxially arranging a plurality of first telescopic pipe sections at intervals on the first branch pipe, it is possible to absorb the expansion deformation of the battery module at different positions in the axial direction, provide a more uniform stress dispersion effect, effectively prevent problems such as damage to the tee or degradation of the battery module performance caused by local stress concentration, and thus better protect the structural integrity and electrical performance stability of the battery module.

[0014] Each first telescopic pipe section on the first branch pipe shares a part of the deformation generated by the expansion of the battery module, so that the stress borne by each first telescopic pipe section is relatively reduced, which helps to reduce the risk of fatigue damage and aging failure of a single first telescopic pipe section due to long-term excessive stress, and extends the service life of the entire tee pipe. Furthermore, the reliability and durability of the battery pack cooling system are improved, the battery pack failures and maintenance frequency caused by pipeline component damage are reduced, the use cost is lowered, and the use efficiency and economy of the battery pack are improved.

[0015] In addition, when the battery pack encounters an accidental impact or vibration, multiple first telescopic pipe sections can jointly play a buffering role, absorb and disperse the impact force from the outside, and reduce the damage to the cooling pipeline and the internal structure of the battery module. When the battery module undergoes abnormal expansion (such as extreme situations like thermal runaway), the coordinated work of multiple first telescopic pipe sections can provide a greater deformation accommodation capacity, delay or mitigate possible safety accidents, provide an additional safety protection layer for the battery pack, and enhance the safety performance of the battery pack under various complex working conditions.

[0016] In an optional implementation manner, a second telescopic pipe section is provided on the second branch pipe, and the second telescopic pipe section is adapted to telescopically extend along the axial direction of the second branch pipe.

[0017] Beneficial effects: During the actual use of the battery pack, the entire battery module and the surrounding structural components may also generate certain displacements and deformations due to factors such as temperature changes and vibrations. By providing a second telescopic pipe section on the second branch pipe, the cooling pipeline has better deformation adaptability in the direction of the second branch pipe. When external factors cause dimensional changes in the area where the second branch pipe is located, the second telescopic pipe section can compensate through its own telescopic movement, thereby maintaining the integrity and connectivity of the cooling pipeline, ensuring that the coolant circulation is unobstructed, and effectively maintaining the thermal management function of the battery pack.

[0018] In addition, setting the second telescopic pipe section on the second branch pipe provides greater flexibility for the routing and layout of the cooling pipeline, can adjust the length and shape of the second branch pipe to a certain extent, make it easy for the second branch pipe to bypass other components, achieve more optimized space utilization, and is beneficial to improving the rationality and stability of the overall structure of the battery pack.

[0019] In an optional implementation manner, both the first telescopic pipe section and the second telescopic pipe section are elastic telescopic pipes.

[0020] Beneficial effects: The elastic expansion tube has good elastic deformation ability. Whether it is the expansion of the battery module or the change in the pipeline size caused by external factors such as temperature changes, vibration, and shock, the elastic expansion tube can effectively absorb and compensate. Through its own elastic deformation, the stress generated by the deformation is evenly dispersed, avoiding stress concentration in a certain local area, thereby preventing loosening, rupture of the connection part of the cooling pipeline, and damage to the internal structure of the battery module, ensuring the structural integrity and stability of the battery pack under complex working conditions.

[0021] At the same time, during the expansion and contraction process of the elastic expansion tube, it can keep the coolant channel unobstructed and prevent the flow of the coolant from being blocked due to its own deformation.

[0022] In an optional implementation manner, both ends of the first branch pipe are provided with first expansion tube sections, and the end of the first expansion tube section is provided with an insertion pipe section, and the insertion pipe section is used for inserting into the liquid inlet or the liquid outlet.

[0023] Beneficial effects: By providing first expansion tube sections at both ends of the first branch pipe, since the end of the first expansion tube section is provided with an insertion pipe section, the connection between the first branch pipe and the cooling plate is realized by embedding the insertion pipe section into the liquid inlet or the liquid outlet, which can effectively prevent the three-way pipe from loosening, falling off or displacing under external force, ensuring that the connection between the three-way pipe and the cooling plate always remains stable and reliable, guaranteeing the continuity and stability of the coolant circulation, and thus maintaining the effective thermal management performance of the battery pack.

[0024] At the same time, by embedding the insertion pipe section into the liquid inlet or the liquid outlet, a more effective sealing interface can be formed at the connection part. Through the close fit with the inner wall of the liquid inlet or the liquid outlet, the risk of coolant leakage can be reduced, preventing the coolant from leaking into the battery module and damaging the electrical components, avoiding problems such as short circuits and corrosion caused by coolant leakage, improving the safety and reliability of the battery pack, and extending the service life of the battery pack.

[0025] In an optional implementation manner, the axis of the first branch pipe is perpendicular to the plane where the cooling plate is located, and the first branch pipe is perpendicular to the second branch pipe.

[0026] Beneficial effects: The first branch pipe being perpendicular to the cooling plate makes the path of the coolant entering the cooling plate relatively short, reducing the energy loss and flow resistance of the coolant during the flow to the cooling plate, improving the heat exchange efficiency of the entire cooling system, ensuring that the battery module can work within an appropriate temperature range, helping to improve the performance of the battery and extend the service life of the battery.

[0027] The perpendicular arrangement of the first branch pipe and the second branch pipe is beneficial to the compact design of the battery pack structure and improves the energy density of the battery pack.

[0028] In an alternative embodiment, the liquid inlet pipe and the liquid outlet pipe are respectively located on opposite sides of the cooling plate, and both the liquid inlet pipe and the liquid outlet pipe extend along the thickness direction of the battery module.

[0029] Beneficial effects: By arranging the liquid inlet pipe and the liquid outlet pipe on opposite sides of the cooling plate, and both the liquid inlet pipe and the liquid outlet pipe extend along the thickness direction of the battery module, the coolant enters from the liquid inlet pipe on one side, flows through the cooling plate along the thickness direction of the battery module, and fully contacts the battery module for heat exchange during this process, and then flows out from the liquid outlet pipe on the other side, which can ensure the uniform distribution of the coolant in the cooling plate, improve the heat exchange efficiency between the coolant and the battery module, enable the battery module to dissipate heat more effectively, maintain within a suitable working temperature range, and thus improve the performance and service life of the battery.

[0030] Meanwhile, since multiple three-way pipes are respectively arranged on opposite sides of the cooling plate, the three-way pipes correspond to the liquid inlet pipe and the liquid outlet pipe, facilitating the connection between the liquid inlet pipe, the liquid outlet pipe and the three-way pipes.

[0031] In an alternative embodiment, the liquid inlet pipe and the liquid outlet pipe are symmetrically arranged with respect to the central plane of the cooling plate.

[0032] Beneficial effects: The symmetrical arrangement of the liquid inlet pipe and the liquid outlet pipe with respect to the central plane of the cooling plate helps to improve the stability of the overall structure of the battery pack. When the battery pack is subjected to external vibration, impact or other external forces, the symmetrical liquid inlet pipe and liquid outlet pipe can enable the cooling system to better withstand and disperse the external forces, reducing problems such as loosening of the pipeline connection and deformation of the cooling plate caused by uneven local stress.

[0033] In an alternative embodiment, it further includes a thermally conductive structural adhesive, which is clamped between the adjacent cooling plate and the battery module.

[0034] Beneficial effects: The thermally conductive structural adhesive has good thermal conductivity and can effectively fill the gap between the cooling plate and the battery module. During the charging and discharging process of the battery, the heat generated by the battery cells can be transferred to the cooling plate through the thermally conductive structural adhesive, and then taken away by the coolant in the cooling plate, forming an efficient heat conduction path. Compared with direct contact heat transfer, the thermally conductive structural adhesive reduces the thermal resistance, improves the heat transfer efficiency, helps the battery module to dissipate heat better, maintains within a suitable working temperature range, and thus improves the performance and service life of the battery.

[0035] In addition, during the operation of the battery module, slight expansion and displacement may occur. The thermally conductive structural adhesive can play a buffering role, absorb the stress generated by the deformation, and prevent mechanical damages such as abrasion and scratching caused by direct rigid contact between the cooling plate and the battery module. At the same time, the thermally conductive structural adhesive can also protect the electrodes and other sensitive components on the surface of the battery module, avoid damage due to external forces, and ensure the structural integrity and electrical safety of the battery module.

[0036] In an optional embodiment, the first telescopic pipe section and the first branch pipe are any one of integrally formed, welded, adhesively bonded, and hot-pressed.

[0037] The second telescopic pipe section and the second branch pipe are any one of integrally formed, welded, adhesively bonded, and hot-pressed.

[0038] Beneficial effects: By integrally forming, welding, adhesively bonding, or hot-pressing the first telescopic pipe section and the first branch pipe, the connection between the first telescopic pipe section and the first branch pipe is ensured to be firm, preventing the breakage at the connection between the first telescopic pipe section and the first branch pipe and resulting in coolant leakage.

[0039] Similarly, by integrally forming, welding, adhesively bonding, or hot-pressing the second telescopic pipe section and the second branch pipe, the connection between the second telescopic pipe section and the second branch pipe is ensured to be firm, preventing the breakage at the connection between the second telescopic pipe section and the second branch pipe and resulting in coolant leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0041] Figure 1 It is a schematic structural diagram of a battery pack according to an embodiment of the present invention;

[0042] Figure 2 It is a front view of a battery pack according to an embodiment of the present invention;

[0043] Figure 3 It is a rear view of a battery pack according to an embodiment of the present invention;

[0044] Figure 4 It is a schematic structural diagram of a three-way pipe in a battery pack according to an embodiment of the present invention;

[0045] Figure 5 It is a side view of a battery pack according to an embodiment of the present invention;

[0046] Figure 6 This is a front view of a battery pack after hiding the battery module according to an embodiment of the present invention.

[0047] Description of the reference numerals:

[0048] 1. Battery module; 2. Cooling plate; 201. Liquid inlet; 202. Liquid outlet; 3. Three-way pipe; 301. First connection port; 302. Second connection port; 303. First branch pipe; 3031. Insertion pipe section; 3032. First telescopic pipe section; 304. Second branch pipe; 3041. Second telescopic pipe section; 4. Liquid inlet pipe; 5. Liquid outlet pipe; 6. Thermal conductive structural adhesive. Detailed implementation manners

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0050] In the related art, the cooling plates of traditional battery packs are mostly on the bottom or top surface of the battery module, and the cooling surface of the battery cells is narrow. With the development of fast charging technology, it can no longer meet the heat exchange requirements. Therefore, a large-area cooling solution appears, where the cooling plate is placed on the large surface of the battery cells to increase the cooling area and control the temperature. This solution includes multiple battery cells, cooling plates, and connecting pipeline components, etc. However, during charging and discharging, the battery cells will expand, and the cooling plates and connecting pipeline components in the large-area cooling solution have limited ability to absorb the expansion deformation of the battery cells, resulting in a decline in the performance of the battery cells and deformation of the cooling plates, affecting the life and thermal management performance of the battery pack.

[0051] To solve the above technical problems, the embodiments of the present invention will be described below in conjunction with Figures 1 to 6 , to describe the embodiments of the present invention.

[0052] According to an embodiment of the present invention, as Figures 1 to 6 shown, a battery pack is provided, which includes a battery module 1, a cooling plate 2, and a three-way pipe 3.

[0053] Specifically, as Figure 1 and Figure 2 shown, there is at least one battery module 1.

[0054] Specifically, as Figures 1 to 3 shown, there are multiple cooling plates 2, and the multiple cooling plates 2 are arranged at intervals along the thickness direction of the battery module 1. Among them, one battery module 1 is sandwiched between any two adjacent cooling plates 2. Each cooling plate 2 is provided with a liquid inlet 201 and a liquid outlet 202.

[0055] Specifically, as Figures 1 to 3 shown, there are multiple three-way pipes 3, and the multiple three-way pipes 3 are arranged between two adjacent cooling plates 2, and the multiple three-way pipes 3 are respectively located on opposite sides of the cooling plate 2.

[0056] Specifically, as Figures 1 to 6 shown, the three-way pipe 3 includes a first branch pipe 303 and a second branch pipe 304. Among them, the first branch pipe 303 and the second branch pipe 304 are connected and arranged. Two first connection ports 301 are respectively formed at both ends of the first branch pipe 303, and the first connection ports 301 are used to communicate with the liquid inlet 201 and the liquid outlet 202 of the cooling plate 2.

[0057] Specifically, as Figures 1 to 6 shown, one end of the second branch pipe 304 is connected to the first branch pipe 303, and the other end of the second branch pipe 304 forms a second connection port 302, and the second connection port 302 is used to communicate with the liquid inlet pipe 4 and the liquid outlet pipe 5.

[0058] Specifically, in combination with Figures 2 to 4 shown, a first telescopic pipe section 3032 is provided on the first branch pipe 303, and the first telescopic pipe section 3032 is adapted to telescopically move along the thickness direction of the battery module 1.

[0059] In this battery pack, multiple cooling plates 2 are arranged at intervals along the thickness direction of the battery module 1. Each cooling plate 2 is provided with a liquid inlet 201 and a liquid outlet 202. The first connection port 301 of the three-way pipe 3 is communicated with the liquid outlet 202 and the liquid inlet 201 of the cooling plate 2, and the second connection port 302 of the three-way pipe 3 is connected to the liquid inlet pipe 4 and the liquid outlet pipe 5, forming a relatively perfect coolant circulation system. Since a battery module 1 is sandwiched between any two adjacent cooling plates 2, the coolant enters the three-way pipe 3 from the liquid inlet pipe 4 and enters the cooling plate 2 from the three-way pipe 3, and can circulate in the cooling plate 2, taking away the heat generated by the battery module 1, making the heat exchange between the cooling plate 2 and the battery module 1 more efficient and uniform. At the same time, the coolant enters the cooling plate 2 from the liquid inlet 201, and after heat exchange with the battery module 1, flows out from the liquid outlet 202. In the whole process, the heat transfer path is short and direct, reducing the loss and non-uniformity in the heat transfer process.

[0060] In addition, during the charging and discharging process of the battery pack, the battery cells in the battery module 1 will generate an expansion phenomenon. By providing a first telescopic pipe section 3032 on the first branch pipe 303 of the three-way pipe 3, and the first telescopic pipe section 3032 can telescopically move along the thickness direction of the battery module 1, the battery pack can effectively absorb the expansion deformation of the battery module 1 in the thickness direction, and can reduce the extrusion and damage to the internal structure of the battery module 1 caused by the expansion of the battery cells, ensuring the stability and reliability of the battery module 1.

[0061] In addition, while the first telescopic pipe section 3032 adapts to the expansion of the battery cell, it can also play a certain buffering role in the entire pipeline system, reducing the impact on the cooling pipeline and the battery module 1 caused by external vibrations, impacts, and other factors. When the battery pack is affected by external interference, the first telescopic pipe section 3032 can absorb and disperse stress through its own deformation, preventing problems such as loosening, leakage at the pipeline connection, or displacement of internal components of the battery module 1, thereby improving the overall stability and safety of the battery pack in complex usage environments.

[0062] It should be noted that the existence of the first telescopic pipe section 3032 not only does not affect the circulation of the coolant, but also can maintain the integrity and tightness of the entire cooling pipeline system when the battery cell expands, ensuring the continuous and stable operation of the thermal management system, improving the heat dissipation efficiency of the battery pack, enabling the battery pack to maintain an appropriate temperature range under various working conditions, and extending the service life of the battery.

[0063] Specifically, one or more battery modules 1 can be provided. In the embodiments of the present application, the number of battery modules 1 is not specifically limited.

[0064] It should be noted that multiple cooling plates 2 are arranged at intervals along the thickness direction of the battery module 1, ensuring that the cooling plates 2 are in contact with the large surfaces of the battery module 1, so that the cooling plates 2 directly cool the large surfaces of the battery module 1, improving the cooling efficiency of the battery module 1.

[0065] Specifically, the first telescopic pipe section 3032 can be a corrugated pipe, a rubber hose, a composite telescopic pipe, etc. In the embodiments of the present application, the type of the first telescopic pipe section 3032 is not specifically limited.

[0066] In one embodiment, as Figure 4 shown, a plurality of first telescopic pipe sections 3032 are arranged at intervals on the first branch pipe 303. Among them, each first telescopic pipe section 3032 is adapted to expand and contract along the axial direction of the first branch pipe 303.

[0067] By arranging a plurality of first telescopic pipe sections 3032 at intervals on the first branch pipe 303, it is possible to absorb the expansion deformation of the battery module 1 at different positions in the axial direction, provide a more uniform stress dispersion effect, and effectively prevent problems such as damage to the three-way pipe 3 or degradation of the performance of the battery module 1 caused by local stress concentration, thereby better protecting the structural integrity and electrical performance stability of the battery module 1.

[0068] Each first telescopic pipe section 3032 on the first branch pipe 303 shares part of the deformation generated by the expansion of the battery module 1, so that the stress borne by each first telescopic pipe section 3032 is relatively reduced, which helps to reduce the risk of fatigue damage and aging failure of a single first telescopic pipe section 3032 due to long-term excessive stress, and extends the service life of the entire three-way pipe 3. Furthermore, the reliability and durability of the battery pack cooling system are improved, the battery pack failures and maintenance frequencies caused by pipeline component damage are reduced, the use cost is lowered, and the use efficiency and economy of the battery pack are improved.

[0069] In addition, when the battery pack encounters accidental impact or vibration, multiple first telescopic pipe sections 3032 can jointly play a buffering role, absorb and disperse the external impact force, and reduce the damage to the cooling pipeline and the internal structure of the battery module 1. When the battery module 1 undergoes abnormal expansion (such as extreme situations like thermal runaway), the coordinated work of multiple first telescopic pipe sections 3032 can provide a greater deformation accommodation capacity, delay or mitigate possible safety accidents, provide an additional safety protection layer for the battery pack, and enhance the safety performance of the battery pack under various complex working conditions.

[0070] Specifically, multiple first telescopic pipe sections 3032 can be arranged at uniform intervals or non-uniform intervals. In the embodiments of the present application, the distribution mode of multiple first telescopic pipe sections 3032 is not specifically limited.

[0071] In one embodiment, as Figure 4 shown, a second telescopic pipe section 3041 is provided on the second branch pipe 304, and the second telescopic pipe section 3041 is adapted to telescopically extend along the axial direction of the second branch pipe 304.

[0072] During the actual use of the battery pack, the entire battery module 1 and the surrounding structural components may also generate certain displacements and deformations due to factors such as temperature changes and vibrations. By providing the second telescopic pipe section 3041 on the second branch pipe 304, the cooling pipeline has better deformation adaptability in the direction of the second branch pipe 304. When external factors cause dimensional changes in the area where the second branch pipe 304 is located, the second telescopic pipe section 3041 can compensate through its own telescopic movement, thereby maintaining the integrity and connectivity of the cooling pipeline, ensuring that the coolant circulation is unobstructed, and effectively maintaining the thermal management function of the battery pack.

[0073] In addition, setting the second telescopic pipe section 3041 on the second branch pipe 304 provides greater flexibility for the routing and layout of the cooling pipeline, can adjust the length and shape of the second branch pipe 304 to a certain extent, makes it easy for the second branch pipe 304 to bypass other components, realizes more optimized space utilization, and is beneficial to improving the rationality and stability of the overall structure of the battery pack.

[0074] Specifically, the second telescopic pipe section 3041 can be installed on the second branch pipe 304 by means of welding, bonding or plugging, etc., and the second telescopic pipe section 3041 and the second branch pipe 304 can also be integrally formed.

[0075] In one embodiment, as Figure 3 shown, both the first telescopic pipe section 3032 and the second telescopic pipe section 3041 are elastic telescopic pipes.

[0076] The elastic telescopic pipe has good elastic deformation ability. Whether the battery module 1 expands or the pipeline size changes due to external factors such as temperature change, vibration and impact, the elastic telescopic pipe can effectively absorb and compensate. Through its own elastic deformation, the stress generated by the deformation is evenly dispersed, avoiding stress concentration in a certain local area, thereby preventing the connection part of the cooling pipeline from loosening, breaking and the internal structure of the battery module 1 from being damaged, and ensuring the structural integrity and stability of the battery pack under complex working conditions.

[0077] At the same time, during the telescopic process of the elastic telescopic pipe, it can keep the coolant channel unobstructed and prevent the flow of the coolant from being hindered due to its own deformation.

[0078] In one embodiment, as shown in combination with Figures 2 to 4 shown, both ends of the first branch pipe 303 are provided with the first telescopic pipe section 3032, and the end of the first telescopic pipe section 3032 is provided with an insertion pipe section 3031, and the insertion pipe section 3031 is used to be embedded into the liquid inlet 201 or the liquid outlet 202 of the cooling plate 2.

[0079] By providing the first telescopic pipe section 3032 at both ends of the first branch pipe 303, since the end of the first telescopic pipe section 3032 is provided with the insertion pipe section 3031, the connection between the first branch pipe 303 and the cooling plate 2 is realized by embedding the insertion pipe section 3031 into the liquid inlet 201 or the liquid outlet 202, which can effectively prevent the three-way pipe 3 from loosening, falling off or displacing under the action of external force, ensure that the connection between the three-way pipe 3 and the cooling plate 2 always remains stable and reliable, guarantee the continuity and stability of the coolant circulation, and thus maintain the effective thermal management performance of the battery pack.

[0080] At the same time, by embedding the insertion pipe section 3031 into the liquid inlet 201 or the liquid outlet 202, a more effective sealing interface can be formed at the connection part. By closely fitting with the inner wall of the liquid inlet 201 or the liquid outlet 202, the risk of coolant leakage can be reduced, preventing the coolant from leaking into the battery module 1 and damaging the electrical components, avoiding problems such as short circuit and corrosion caused by coolant leakage, improving the safety and reliability of the battery pack, and prolonging the service life of the battery pack.

[0081] Specifically, the insertion pipe section 3031 can be connected to the first telescopic pipe section 3032 by means such as welding or bonding. In the embodiments of the present application, the connection method between the insertion pipe section 3031 and the first telescopic pipe section 3032 is not specifically limited.

[0082] In one embodiment, as shown in Figures 2 to 4 , the axis of the first branch pipe 303 is perpendicular to the plane where the cooling plate 2 is located, and the first branch pipe 303 is perpendicular to the second branch pipe 304.

[0083] The first branch pipe 303 being perpendicular to the cooling plate 2 makes the path for the coolant to enter the cooling plate 2 relatively short, reducing the energy loss and flow resistance of the coolant during the flow to the cooling plate 2, improving the heat exchange efficiency of the entire cooling system, ensuring that the battery module 1 can operate within a suitable temperature range, and contributing to enhancing the performance of the battery and extending the service life of the battery.

[0084] The perpendicular arrangement of the first branch pipe 303 and the second branch pipe 304 is conducive to achieving a compact design of the battery pack structure and improving the energy density of the battery pack.

[0085] In one embodiment, as shown in Figure 3 , the liquid inlet pipe 4 and the liquid outlet pipe 5 are respectively located on opposite sides of the cooling plate 2, and both the liquid inlet pipe 4 and the liquid outlet pipe 5 extend along the thickness direction of the battery module 1.

[0086] By arranging the liquid inlet pipe 4 and the liquid outlet pipe 5 on opposite sides of the cooling plate 2, and both the liquid inlet pipe 4 and the liquid outlet pipe 5 extend along the thickness direction of the battery module 1, the coolant enters from the liquid inlet pipe 4 on one side, flows through the cooling plate 2 along the thickness direction of the battery module 1, and fully contacts the battery module 1 for heat exchange during this process, and then flows out from the liquid outlet pipe 5 on the other side, which can ensure the uniform distribution of the coolant in the cooling plate 2, improve the heat exchange efficiency between the coolant and the battery module 1, enable the battery module 1 to dissipate heat more effectively, and maintain within a suitable operating temperature range, thereby enhancing the performance and service life of the battery.

[0087] At the same time, since a plurality of three-way pipes 3 are respectively arranged on opposite sides of the cooling plate 2, the three-way pipes 3 correspond to the liquid inlet pipe 4 and the liquid outlet pipe 5, facilitating the connection between the liquid inlet pipe 4 and the liquid outlet pipe 5 and the three-way pipes 3.

[0088] In one embodiment, as shown in Figure 2 and Figure 3 , the liquid inlet pipe 4 and the liquid outlet pipe 5 are symmetrically arranged with respect to the central plane of the cooling plate 2.

[0089] The symmetric arrangement of the liquid inlet pipe 4 and the liquid outlet pipe 5 with respect to the central plane of the cooling plate 2 helps to improve the stability of the overall structure of the battery pack. When the battery pack is subjected to external vibrations, impacts, or other external forces, the symmetric liquid inlet pipe 4 and liquid outlet pipe 5 enable the cooling system to better withstand and disperse the external forces, reducing problems such as loosening of the pipeline connections and deformation of the cooling plate 2 caused by uneven local stress.

[0090] In one embodiment, as Figure 2 and Figure 3 shown, it further includes a thermally conductive structural adhesive 6, and the thermally conductive structural adhesive 6 is clamped between the adjacent cooling plate 2 and the battery module 1.

[0091] The thermally conductive structural adhesive 6 has good thermal conductivity and can effectively fill the gap between the cooling plate 2 and the battery module 1. During the charging and discharging process of the battery, the heat generated by the battery cells can be transferred to the cooling plate 2 through the thermally conductive structural adhesive 6, and then taken away by the coolant in the cooling plate 2, forming an efficient heat conduction path. Compared with direct contact heat transfer, the thermally conductive structural adhesive 6 reduces the thermal resistance and improves the heat transfer efficiency, which helps the battery module 1 to dissipate heat better, maintain within a suitable operating temperature range, and thus improve the performance and service life of the battery.

[0092] In addition, during the operation of the battery module 1, slight expansion and displacement may occur. The thermally conductive structural adhesive 6 can play a buffering role, absorb the stress generated by the deformation, and prevent mechanical damages such as abrasion and scratching caused by direct rigid contact between the cooling plate 2 and the battery module 1. At the same time, the thermally conductive structural adhesive 6 can also protect the electrodes and other sensitive components on the surface of the battery module 1 from being damaged due to external forces, ensuring the structural integrity and electrical safety of the battery module 1.

[0093] In one embodiment, as Figure 2 and Figure 3 shown, multiple cooling plates 2 are arranged in parallel.

[0094] During the charging and discharging process of the battery, the heat generated by the battery module 1 can be evenly transferred to the adjacent cooling plate 2, and then the heat is taken away by the circulation of the coolant in the cooling plate 2. Since the cooling plates 2 are arranged in parallel, it helps to avoid local overheating of the battery module 1 caused by uneven cooling, ensure the uniformity of the overall temperature distribution of the battery module 1, thereby improving the performance stability of the battery and extending the service life of the battery.

[0095] The parallel arrangement of the cooling plates 2 facilitates the installation of the cooling plates 2, improves the production efficiency of the battery pack, and reduces the production cost.

[0096] In one embodiment, the first telescopic pipe section 3032 and the first branch pipe 303 are integrally formed, welded, bonded, or hot-pressed in any one of the above ways.

[0097] The second telescopic pipe section 3041 is integrally formed with, welded to, adhesively bonded to, or hot-pressed to the second branch pipe 304.

[0098] The first telescopic pipe section 3032 and the first branch pipe 303 are integrally formed, welded, adhesively bonded, or hot-pressed to ensure a firm connection between the first telescopic pipe section 3032 and the first branch pipe 303, preventing coolant leakage due to fracture at the connection between the first telescopic pipe section 3032 and the first branch pipe 303.

[0099] Similarly, the second telescopic pipe section 3041 and the second branch pipe 304 are integrally formed, welded, adhesively bonded, or hot-pressed to ensure a firm connection between the second telescopic pipe section 3041 and the second branch pipe 304, preventing coolant leakage due to fracture at the connection between the second telescopic pipe section 3041 and the second branch pipe 304.

[0100] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A battery pack, characterized in that: include: at least one battery module; A plurality of cooling plates are arranged at intervals along the thickness direction of the battery module, a battery module is sandwiched between any two adjacent cooling plates, and each cooling plate is provided with a liquid inlet and a liquid outlet; A plurality of three-way pipes are arranged between two adjacent cooling plates and are respectively located on opposite sides of the cooling plates, the three-way pipes include a first branch pipe and a second branch pipe, two first connecting ports are respectively formed at both ends of the first branch pipe, the first connecting port is used to communicate with the liquid inlet or the liquid outlet, one end of the second branch pipe is connected to the first branch pipe, and the other end forms a second connecting port for communicating with the liquid inlet pipe or the liquid outlet pipe, the first branch pipe is provided with a first telescopic pipe section, and the first telescopic pipe section is suitable for telescoping along the thickness direction of the battery module.

2. The battery pack according to claim 1, characterized in that: A plurality of first telescopic pipe sections are arranged at intervals on the first branch pipe, and each of the first telescopic pipe sections is suitable for telescoping along the axial direction of the first branch pipe.

3. The battery pack according to claim 2, characterized in that: The second branch pipe is provided with a second telescopic pipe section, and the second telescopic pipe section is suitable for telescoping along the axial direction of the second branch pipe.

4. The battery pack according to claim 3, characterized in that: The first telescopic tube section and the second telescopic tube section are both elastic telescopic tubes.

5. The battery pack according to any one of claims 1 to 4, characterized in that: The first telescopic pipe sections are disposed at both ends of the first branch pipe, and an inserting pipe section is disposed at the end of the first telescopic pipe section. The inserting pipe section is used to be inserted into the liquid inlet or the liquid outlet.

6. The battery pack according to any one of claims 1 to 4, characterized in that: The axis of the first branch pipe is perpendicular to the plane where the cooling plate is located, and the first branch pipe and the second branch pipe are arranged perpendicularly.

7. The battery pack according to any one of claims 1 to 4, characterized in that: The liquid inlet pipe and the liquid outlet pipe are respectively located on two opposite sides of the cooling plate, and both the liquid inlet pipe and the liquid outlet pipe extend along the thickness direction of the battery module.

8. The battery pack according to claim 7, characterized in that: The liquid inlet pipe and the liquid outlet pipe are symmetrically arranged with respect to the central plane of the cooling plate.

9. The battery pack according to any one of claims 1 to 4, characterized in that: It also includes a heat-conducting structural adhesive, which is sandwiched between the adjacent cooling plates and the battery modules.

10. The battery pack according to claim 3, characterized in that: The first telescopic pipe section and the first branch pipe are formed by any one of integral molding, welding, bonding, and hot pressing; The second telescopic pipe section and the second branch pipe are formed by any one of integral molding, welding, bonding, and hot pressing.

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