Busbar, battery module, battery pack and vehicle

Abstract

The utility model provides a kind of busbar, battery module, battery pack and vehicle, it is related to energy storage technical field.The one side of the busbar is equipped with recess, the busbar is used to be welded and connected with the output pole of battery cell by the groove bottom wall of recess.The utility model's busbar is welded and connected with the output pole by the groove bottom wall of recess by being equipped with recess, so that even if battery cell output pole and busbar welding can produce welding slag or irregular weld, the welding slag or irregular weld is also located in recess, and will not directly contact with cold plate, avoid the short-circuit risk of welding slag or irregular weld between cold plate and busbar, improve the security and reliability of battery pack.

Description

Technical Field

[0001] This utility model relates to the field of energy storage technology, specifically to a busbar, a battery module, a battery pack, and a vehicle. Background Technology

[0002] With the popularization of new energy vehicles and the rapid growth in demand for vehicle electrification, users have put forward higher requirements for the charging speed of vehicle power batteries. Correspondingly, fast charging technology has become a hot topic in current battery research and development.

[0003] During the fast charging process of power batteries, the battery cells generate a large amount of heat due to the high current charging and discharging. If this heat cannot be dissipated in a timely and effective manner, the internal temperature of the battery will become too high, thereby reducing charging efficiency, affecting battery life, and even potentially causing safety hazards. To address this, related technologies often use cold plates to dissipate heat and cool the busbar connected to the output electrode of the battery cell. However, the cold plate design in these technologies still has certain shortcomings in terms of cooling capacity and safety. For example, the output electrode of the battery cell and the busbar are usually connected using a laser welding process, which can easily generate weld slag during the welding process. This weld slag poses a challenge to the insulation between the cold plate and the busbar. For instance, weld slag located between the cold plate and the busbar can easily damage the insulation layer or form a conductive path, thereby compromising the insulation between the cold plate and the busbar and leading to a short circuit. Utility Model Content

[0004] The problem this invention addresses is how to avoid the risk of short circuit between the cold plate and the busbar.

[0005] To address the aforementioned problems, this utility model provides a busbar, a battery module, a battery pack, and a vehicle.

[0006] In a first aspect, the present invention provides a busbar, wherein a groove is provided on one side of the busbar, and the busbar is used to weld and connect to the output electrode of the battery cell through the bottom wall of the groove.

[0007] Optionally, the bottom wall of the tank is provided with a positioning hole for accommodating the output electrode, and the bottom wall of the tank is welded to the output electrode at the positioning hole.

[0008] Secondly, this utility model provides a battery module, including a battery cell and a bus as described in the first aspect. The bus is located at the end of the battery cell where an output electrode is provided, and a groove is provided on the side of the bus away from the battery cell. The bus is welded to the output electrode at the bottom wall of the groove.

[0009] Optionally, the explosion-proof valve of the battery cell is located at the end of the battery cell away from the busbar.

[0010] Thirdly, this utility model provides a battery pack, including a battery module as described in the second aspect, and a first cold plate, the first cold plate being located at one end of the battery module where a busbar is provided; and the side of the first cold plate facing the battery cell of the battery module is at least in contact with the side of the busbar away from the battery cell.

[0011] Optionally, the battery pack further includes a second cold plate, which is disposed at one end of the battery module away from the first cold plate and connected to the battery cell of the battery module; and the second cold plate is provided with an avoidance hole at the explosion-proof valve of the battery cell.

[0012] Optionally, the first cold plate has a protrusion that protrudes toward the battery module, and the protrusion abuts against a portion of the battery module other than the output electrode of the battery cell.

[0013] Optionally, the output electrode includes a first output electrode and a second output electrode, the first output electrode and the second output electrode being spaced apart at one end of the cell facing the first cold plate; the protrusion is located between the first output electrode and the second output electrode.

[0014] Optionally, the side of the first cold plate facing the battery cell of the battery module is provided with an insulating layer;

[0015] And / or, the first cold plate is bonded to the battery module using thermally conductive structural adhesive.

[0016] Fourthly, this utility model provides a vehicle including the battery pack as described in the third aspect.

[0017] The beneficial effects of this utility model's busbar, battery module, battery pack, and vehicle are as follows: The battery pack of this utility model features a busbar with grooves. The busbar is welded to the output electrode via the bottom wall of the groove, and the end of the busbar facing away from the battery cell is connected to the first cold plate. This ensures that even if welding slag or irregular weld seams are generated during the welding of the battery cell's output electrode to the busbar, these slag or irregular weld seams are located within the groove and do not directly contact the first cold plate. This effectively avoids the possibility of damage to the insulation layer of the first cold plate caused by direct contact between welding slag or irregular weld seams, thus preventing a short circuit in the busbar. This avoids the risks associated with welding slag or irregular weld seams and improves the safety and reliability of the battery pack. In addition, the first cold plate is connected to the busbar to dissipate the heat generated during the operation of the battery cell in a timely and efficient manner, especially the heat near the output electrode of the battery cell. This effectively reduces the temperature of the output electrode and the battery cell as a whole, avoiding the safety hazards caused by the large amount of heat generated due to the limited overcurrent area of ​​the output electrode when the battery cell is charged with high current (corresponding to fast charging) or discharged with high current (corresponding to high load). This ensures the safety and reliability of the battery pack under fast charging and high load conditions. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a battery pack in an embodiment of the present invention, showing multiple battery cells connected by a busbar.

[0019] Figure 2 This is a schematic diagram of the battery cell structure in an embodiment of this utility model;

[0020] Figure 3 This is a structural schematic diagram of the battery cell from another perspective in an embodiment of this utility model;

[0021] Figure 4 This is a cross-sectional view of the battery pack in an embodiment of the present invention.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Battery cell; 11. Output pole; 11a. First output pole; 11b. Second output pole; 12. Explosion-proof valve; 2. First cold plate; 21. Protrusion; 3. Busbar; 31. Groove; 31a. Groove bottom wall; 4. Second cold plate; 5. Housing; 6. Weld. Detailed Implementation

[0024] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Although some embodiments of this utility model are shown in the drawings, it should be understood that this utility model can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this utility model. It should be understood that the drawings and embodiments of this utility model are for illustrative purposes only and are not intended to limit the scope of protection of this utility model.

[0025] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this utility model are only used to distinguish different devices, modules, or units, and are not used to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0026] It should be noted that the terms "one" and "multiple" used in this utility model are illustrative rather than restrictive. Those skilled in the art should understand that, unless explicitly stated otherwise in the context, they should be understood as "one or more". The term "connection" used in this utility model, unless specifically stated otherwise, can refer to a direct connection, an indirect connection via one or more intermediate components, a detachable connection, welding, or an integral connection.

[0027] Combination Figure 1 , Figure 4 As shown, this utility model embodiment provides a busbar. A groove 31 is provided on one side of the busbar 3. The busbar 3 is used to weld and connect to the output electrode 11 of the battery cell 1 through the bottom wall 31a of the groove 31.

[0028] In this embodiment, the busbar 3 is used to realize the series and / or parallel connection of multiple cells 1 of the battery module in the battery pack. That is, multiple cells 1 are connected in series and / or parallel through the busbar 3, thereby forming a high-voltage, large-capacity battery module to meet the corresponding power consumption and energy storage requirements.

[0029] The busbar 3 has a groove 31 on the side away from the battery cell 1. That is, the groove 31 is recessed towards the battery cell 1 on the side of the busbar 3 away from the battery cell 1. Specifically, the busbar 3 can be partially protruded towards the battery cell 1 by a stamping process, thereby forming the groove 31 on the side of the busbar 3 away from the battery cell. Busbar 3 is welded to the output electrode 11 of cell 1 through the bottom wall 31a of groove 31. The side of busbar 3 away from cell 1 (i.e. the side of busbar 3 with groove 31) is used to connect with the corresponding cold plate (such as the first cold plate 2 described later). In this way, even if welding slag or irregular weld seams are generated when welding the output electrode 11 of cell 1 to busbar 3, the welding slag or irregular weld seams are located in groove 31 and will not directly contact the first cold plate 2. This can effectively avoid the situation where welding slag or irregular weld seams may damage the insulation layer of the first cold plate 2 when they directly contact the first cold plate 2, thus preventing the busbar 3 from short-circuiting. In other words, it avoids the risk of short circuit between the cold plate and the busbar caused by welding slag or irregular weld seams, and improves the safety and reliability of the battery pack. Among them, the first cold plate 2 is a component of the thermal management system of the battery pack. Its end facing the cell 1 is attached to the side of the busbar 3 away from the cell 1. It can timely and efficiently dissipate the heat generated by the cell 1 during operation, and help maintain the temperature of the cell 1 within a reasonable range.

[0030] In this way, the busbar 3 is provided with a groove 31 and is welded to the output electrode 11 through the bottom wall 31a of the groove 31. The side of the busbar 3 away from the cell 1 is connected to the first cold plate 2. Thus, even if welding slag or irregular weld seams are generated when the output electrode 11 of the cell 1 is welded to the busbar 3, the welding slag or irregular weld seams are located in the groove 31 and will not directly contact the first cold plate 2. This effectively avoids the possibility of the welding slag or irregular weld seams directly contacting the first cold plate 2 and damaging the insulation layer of the first cold plate 2, which could lead to a short circuit in the busbar 3. This avoids the risk of short circuit between the cold plate and the busbar caused by welding slag or irregular weld seams, and improves the safety and reliability of the battery pack.

[0031] Optionally, the bottom wall 31a of the tank is provided with a positioning hole for accommodating the output electrode 11, and the bottom wall 31a of the tank is welded to the output electrode 11 at the positioning hole.

[0032] In this embodiment, to improve the welding accuracy and connection stability between the output electrode 11 of the battery cell 1 and the busbar 3, a groove 31 is provided on the busbar 3 at the position corresponding to the output electrode 11 of the battery cell 1, and a positioning hole is provided on the bottom wall 31a of the groove 31 to accommodate and position the output electrode 11. Specifically, the shape of the positioning hole matches the shape of the output electrode 11 so as to smoothly accommodate the output electrode 11 and to accurately position the output electrode 11 on the busbar 3 before welding it to the busbar 3, avoiding welding deviation caused by displacement of the output electrode 11. For example, before welding, the output electrode 11 of the battery cell 1 is inserted into the positioning hole; then, by laser welding, spot welding or other welding methods, the bottom wall 31a of the groove and the output electrode 11 are firmly welded together at the position of the positioning hole; after welding, the output electrode 11 and the busbar 3 achieve reliable mechanical fixation and electrical connection at the positioning hole, and facilitate the heat generated at the output electrode 11 of the battery cell 1 to be smoothly conducted to the first cold plate 2 for heat dissipation through the busbar 3.

[0033] In this way, by setting positioning holes, on the one hand, the output electrode 11 can be prevented from shifting due to thermal stress or external force during the welding process, thereby improving welding quality and ensuring its consistency. On the other hand, by extending the output electrode 11 into the positioning holes, the space occupied by the busbar 3 and the cell 1 in the axial direction of the output electrode 11 can be reduced, which facilitates the improvement of the battery pack's structural compactness and space utilization, thus achieving higher energy density and integration within a limited installation space. In addition, the positioning holes can also effectively limit the welding area, confining any weld slag or irregular welds generated during the welding process within the positioning holes, further improving welding quality and weld aesthetics.

[0034] Another embodiment of the present invention provides a battery module, including a battery cell 1 and the aforementioned busbar 3. The busbar 3 is located at the end of the battery cell 1 where the output electrode 11 is provided, and a groove 31 is provided on the side of the busbar 3 away from the battery cell 1. The busbar 3 is welded to the output electrode 11 at the bottom wall 31a of the groove 31.

[0035] In this embodiment, the battery cell 1, as the core component of the battery module, is electrically connected to the busbar 3 via its output terminal 11, so as to realize the collection and transmission of electrical energy through the busbar 3. Specifically, each battery cell 1 has a corresponding output terminal 11 (such as a positive terminal and a negative terminal), which is located at the end of the battery cell 1. The busbar 3 is located at the end of the battery cell 1 where the output terminal 11 is located, which facilitates the connection between the output terminal 11 and the busbar 3. The battery module has multiple battery cells 1, and the busbar 3 is used to realize the collection and transmission of current for unified charging and discharging of multiple battery cells 1. To ensure the stability of the electrical connection between the output terminal 11 of the battery cell 1 and the busbar 3, it is preferable that the busbar 3 and the output terminal 11 are electrically connected by welding, such as by laser welding. Figure 1 Weld 6 is shown.

[0036] In order to avoid the welding slag or irregular weld seam that may be generated when welding the output pole 11 of the battery cell 1 to the busbar 3, affecting the insulation between the busbar 3 and the corresponding cold plate (such as the first cold plate 2), the side of the busbar 3 with the groove 31 is set away from the battery cell 1, that is, the groove 31 is set on the side of the busbar 3 away from the battery cell 1. By providing a groove 31 on the side of the busbar 3 away from the battery cell 1, corresponding to the output electrode 11 of the battery cell 1, the groove 31 is recessed towards the battery cell 1 (or output electrode 11) on the side of the busbar 3 away from the battery cell 1. The busbar 3 is welded to the output electrode 11 through the bottom wall 31a of the groove 31. The side of the busbar 3 away from the battery cell 1 (i.e. the side of the busbar 3 with the groove 31) is used to connect with the first cold plate 2. This ensures that even if welding slag or irregular welds are generated when welding the output electrode 11 of the battery cell 1 to the busbar 3, the welding slag or irregular welds are located in the groove 31 and will not directly contact the first cold plate 2. This effectively avoids the risk of short circuit between the cold plate and the busbar caused by welding slag or irregular welds.

[0037] Optionally, combined Figures 1-4 As shown, cell 1 adopts a square structure (such as a cuboid structure, a cube structure, or a similar cuboid structure or a similar cube structure) in order to achieve a close arrangement of multiple cells 1, so as to optimize the internal space layout of the battery pack and improve the energy density of the battery pack.

[0038] Optionally, combined Figure 2 , Figure 3 As shown, the explosion-proof valve 12 of the battery cell 1 is located at the end of the battery cell 1 away from the busbar 3.

[0039] In this embodiment, to further improve the safety of the battery pack, the explosion-proof valve 12 of the cell 1 is located at the end of the cell 1 facing away from the busbar 3. That is, the output terminal 11 of the cell 1 and the explosion-proof valve 12 are located at opposite ends of the cell 1. The side of the busbar 3 facing away from the cell 1 is used to connect the cold plate. As a safety protection device for the cell 1, the explosion-proof valve 12 is designed to release the internal pressure in a timely manner when the internal pressure of the cell 1 rises abnormally, to prevent the cell 1 from exploding or other safety accidents due to overpressure. By placing the explosion-proof valve 12 at the end of the cell 1 facing away from the busbar 3, the high-temperature airflow caused by the rapid release of gas inside the cell 1 can be effectively prevented from directly impacting the cold plate (i.e., the first cold plate 2 mentioned later) connected to the busbar 3. This can prevent damage to the insulation layer of the cold plate or the connection between the cold plate and the busbar 3, thereby effectively improving the safety and reliability of the cell 1, the battery pack, and the vehicle using the battery pack. Furthermore, the design of the explosion-proof valve 12 and the output electrode 11 being located at opposite ends of the battery cell 1 reduces the safety risk during thermal runaway when a CTB (Battery Body Integration Technology, which further integrates the battery cover with the vehicle floor) connection scheme is adopted between the battery pack and the vehicle. For example, with the output electrode 11 of the battery cell 1 facing upwards and the explosion-proof valve 12 facing downwards, when the battery cell 1 experiences thermal runaway or an abnormal increase in internal pressure, the downward-facing design of the explosion-proof valve 12 allows gas and heat to be quickly discharged outside the vehicle without directly impacting the vehicle interior, thus ensuring the safety of the driver and passengers inside the vehicle.

[0040] Another embodiment of the present invention provides a battery pack, including the battery module described above, and also includes a first cold plate 2, the first cold plate 2 being located at the end of the battery module where the busbar 3 is provided; and the side of the first cold plate 2 facing the battery cell 1 of the battery module is at least in contact with the side of the busbar 3 away from the battery cell 1.

[0041] In this embodiment, the battery pack (PACK) is an integrated battery system that can be used as a power battery for new energy vehicles, meeting their power consumption and energy storage needs. Multiple battery cells 1 of the battery module in the battery pack are connected in series and / or in parallel via a busbar 3, forming a high-voltage, high-capacity battery module. This module, together with the busbar 3 and a corresponding cooling system (or thermal management system, including a first cold plate 2), forms an integrated structure with high-efficiency energy output and excellent heat dissipation performance.

[0042] Specifically, the battery cell 1 (or battery module) is the core component of the battery pack. The output terminal 11 of the battery cell 1 is electrically connected to the busbar 3 to collect and transmit electrical energy. Each battery cell 1 has a corresponding output terminal 11 (e.g., positive and negative terminals), located at the end of the battery cell 1. The busbar 3 is located at the end of the battery cell 1 with the output terminal 11, facilitating the connection between the output terminal 11 and the busbar 3. The battery pack has at least one battery module, and each battery module has multiple battery cells 1. The busbar 3 is used to collect and transmit current for unified charging and discharging of multiple battery cells 1. To ensure the stability of the electrical connection between the output terminal 11 of the battery cell 1 and the busbar 3, it is preferable that the busbar 3 and the output terminal 11 are electrically connected by welding, such as using laser welding. Figure 1 Weld 6 is shown.

[0043] To prevent weld slag or irregular weld seams that may be generated during the welding of the output electrode 11 of the battery cell 1 to the busbar 3 from affecting the insulation between the busbar 3 and the first cold plate 2, the side of the busbar 3 with the groove 31 is positioned away from the battery cell 1. That is, the groove 31 is located on the side of the busbar 3 away from the battery cell 1. By providing a groove 31 on the busbar 3 that is recessed towards the battery cell 1 (or output electrode 11) at a position corresponding to the output electrode 11 of the battery cell 1, the busbar 3 is welded to the output electrode 11 through the bottom wall 31a of the groove 31. This ensures that even if weld slag or irregular weld seams are generated during the welding of the output electrode 11 of the battery cell 1 to the busbar 3, these weld slag or irregular weld seams will be located within the groove 31 and will not directly contact the first cold plate 2. This effectively avoids the risk (or safety hazard) of short circuit between the cold plate and the busbar caused by weld slag or irregular weld seams.

[0044] Furthermore, the first cold plate 2, as a component of the battery pack's thermal management system, has its side facing the cell 1 at least in contact with the side of the busbar 3 opposite to the cell 1 (i.e., the side of the busbar 3 with the groove 31). This increases the connection and contact area between the busbar 3 and the first cold plate 2, improving the stability of the connection between the busbar 3 and the first cold plate 2, and enhancing the heat dissipation effect of the cell 1. The first cold plate 2, in conjunction with the busbar 3, efficiently and promptly dissipates the heat generated by the cell 1 during operation, especially the heat near the output electrode 11 of the cell 1. Because the output electrode 11 has a limited current-carrying area, it easily generates significant heat during high-current charging (corresponding to fast charging) and high-current discharging (corresponding to high load), making it the hottest point on the cell 1. By dissipating the heat near the output electrode 11 of the cell 1 through the first cold plate 2 and the busbar 3, the temperature of the output electrode 11 and the cell 1 as a whole can be effectively reduced, ensuring the safety and reliability of the battery pack under fast charging and high-load conditions. In some embodiments, the first cold plate 2 also abuts against a portion other than the output electrode 11 at the end where the output electrode 11 of the battery cell 1 is located (described later) to further improve the connection stability and heat dissipation performance between the battery cell 1 and the first cold plate 2.

[0045] Optionally, combined Figure 3 , Figure 4 As shown, the battery pack also includes a second cold plate 4, which is disposed at the end of the battery module away from the first cold plate 2 and connected to the battery cell 1 of the battery module; and the second cold plate 4 has an avoidance hole at the explosion-proof valve 12 of the battery cell 1.

[0046] In this embodiment, to further optimize the thermal management of the battery pack, in addition to the first cold plate 2, the battery pack also includes a second cold plate 4. The first cold plate 2 and the second cold plate 4 are located at opposite ends of the battery cell 1 (or battery module), and the second cold plate 4 is connected to the battery cell 1 at the end where the explosion-proof valve 12 is located. This increases the heat dissipation area of ​​the battery cell 1, and the connection of multiple battery cells 1 with the first cold plate 2 and the second cold plate 4 further enhances the overall structural stability of the battery pack, improves the impact resistance of the battery pack, and expands the applicability and applicable scenarios of the battery pack. Specifically, the second cold plate 4 is located at the end of the battery cell 1 (or battery module) away from the first cold plate 2 and is connected to the battery cell 1. The first cold plate 2 and the second cold plate 4 cooperate to achieve bidirectional heat dissipation of the battery cell 1, further improving the temperature control capability of the battery cell 1. To ensure the proper functioning of the explosion-proof valve 12, the second cold plate 4 has an clearance hole at the corresponding position of the explosion-proof valve 12. The size and shape of the clearance hole are designed according to the shape and release direction of the explosion-proof valve 12 to ensure that when the internal pressure of the battery cell 1 abnormally increases, the explosion-proof valve 12 can smoothly release gas or heat without being obstructed by the second cold plate 4. Thus, the installation of the second cold plate 4 not only improves the thermal management capability of the battery pack but also ensures the proper functioning of the explosion-proof valve 12, further enhancing the safety and reliability of the battery pack. This makes the battery pack suitable for applications with high safety requirements, such as new energy vehicles and energy storage devices.

[0047] Optionally, the first cold plate 2 is provided with a protrusion 21 that protrudes toward the battery module, and the protrusion 21 abuts against the part of the battery module other than the output electrode 11 of the cell 1.

[0048] In this embodiment, in order to further improve the connection stability and heat dissipation performance between the battery cell 1 and the first cold plate 2, in addition to being connected to the output electrode 11 of the battery cell 1 through the busbar 3, the first cold plate 2 is also directly connected to the battery cell 1 at other positions on the end of the battery cell 1 facing the first cold plate 2 through the protrusion 21, so as to increase the connection area and contact area between the battery cell 1 and the first cold plate 2, and further improve the connection stability and heat dissipation effect of the battery cell 1. Specifically, considering the certain distance between the first cold plate 2 and the end face of the cell 1 with the output electrode 11, a protrusion 21 is provided on the side of the first cold plate 2 facing the cell 1, protruding towards the battery module. The protrusion 21 abuts against (makes contact with or even connects to) the end face of the cell 1, excluding the output electrode 11. In other words, the protrusion 21 avoids the positions of the busbar 3 and the output electrode 11, and directly connects to the end face of the cell 1. This avoids interference between the protrusion 21 and the busbar 3 and the output electrode 11, while making full use of the space within the battery pack, increasing the contact area between the first cold plate 2 and the cell 1, and improving the connection stability between the cell 1 and the first cold plate 2 and the heat dissipation effect of the cell 1. In addition, by providing the protrusion 21, heat near the output electrode 11 of the cell 1 and on the end face where the output electrode 11 of the cell 1 is located can be effectively dissipated, further improving the thermal management performance of the battery pack and enhancing its safety and reliability.

[0049] Optionally, combined Figure 2 , Figure 4 As shown, the output pole 11 includes a first output pole 11a and a second output pole 11b, which are spaced apart at one end of the cell 1 facing the first cold plate 2; the protrusion 21 is located between the first output pole 11a and the second output pole 11b.

[0050] In this embodiment, in addition to being connected to the output electrode 11 of the battery cell 1 via the busbar 3, the first cold plate 2 can also be directly connected to the battery cell 1 at a location other than the output electrode 11, thereby increasing the connection area and contact area between the battery cell 1 and the first cold plate 2, and further improving the connection stability and heat dissipation effect of the battery cell 1. Specifically, the output electrode 11 of the battery cell 1 includes a first output electrode 11a and a second output electrode 11b (e.g., the positive and negative electrodes of the battery cell 1, respectively), and these two output electrodes 11 are spaced apart on one end face of the battery cell 1 facing the first cold plate 2. The protrusion 21 of the first cold plate 2 protrudes from the side of the first cold plate 2 facing the cell 1 and is located between the first output electrode 11a and the second output electrode 11b, so as to abut and / or connect with the end face of the cell 1 between the first output electrode 11a and the second output electrode 11b. That is, the protrusion 21 avoids the busbar 3 and the output electrode 11 and directly connects to the corresponding position at the end of the cell 1. While avoiding interference between the protrusion 21 and the busbar 3 and the output electrode 11, it makes full use of the space in the battery pack, increases the contact area between the first cold plate 2 and the cell 1, and improves the connection stability between the cell 1 and the first cold plate 2 and the heat dissipation effect of the cell 1.

[0051] Optionally, the groove 31 on the busbar 3 can be formed by a stamping process, or by a milling process, laser processing, or other processes. In some embodiments, to reduce the manufacturing cost of the busbar 3, it is preferable to use a stamping process to form the groove 31 on the busbar 3.

[0052] Optionally, the protrusion 21 on the first cold plate 2 can be formed by a stamping process, such as stamping a corresponding plate material so that a portion of the first cold plate 2 protrudes towards the battery cell 1 (or output electrode 11) to form a protrusion; or it can be formed by a milling process, laser processing, or other processes, such as subtractive manufacturing of the corresponding plate material by milling or laser processing to precisely form the required shape of the protrusion 21 on the first cold plate 2. In some embodiments, to reduce the manufacturing cost of the first cold plate 2, it is preferable to use a stamping process to form the protrusion 21.

[0053] Optionally, the first cold plate 2 is provided with a protrusion 21, and the first cold plate 2 includes a flow channel plate, a substrate and an insulating layer stacked in sequence. If the protrusion 21 is formed by stamping process, the protrusion 21 is formed by stamping at the corresponding positions of the flow channel plate, the substrate and the insulating layer.

[0054] Optionally, the first cold plate 2 has an insulating layer on the side facing the battery cell 1 of the battery module.

[0055] For example, to further optimize the thermal management and electrical insulation performance of the battery pack, the first cold plate 2 adopts a multi-layer structure, including a flow channel plate, a substrate, and an insulating layer stacked and connected sequentially. Specifically, the stacked design of the flow channel plate, substrate, and insulating layer enables the first cold plate 2 to provide effective electrical isolation while maintaining excellent heat dissipation performance, ensuring a safe connection between the battery cell 1, the busbar 3, and the first cold plate 2. The flow channel plate has multiple cooling channels to guide the coolant flow inside the battery pack; the coolant circulates through the channels of the flow channel plate, carrying away the heat generated by the battery cell 1 during operation, helping to maintain the temperature of the battery cell 1 within a reasonable range; in some embodiments, the flow channel plate can be made of a metal material with good thermal conductivity to ensure efficient heat dissipation. The substrate is located between the flow channel plate and the insulating layer, mainly serving a supporting function and having good thermal conductivity; in some embodiments, the substrate is typically made of a metal material with high mechanical strength and good thermal conductivity to improve cooling efficiency and the overall stability of the battery pack. The insulating layer is mainly used to achieve electrical isolation, preventing direct electrical contact between the battery cell 1, busbar 3 and cold plate, thereby avoiding short circuits or other electrical faults. In some embodiments, the insulating layer can be made of a material with good insulating properties, such as polyimide (PI) or other insulating composite materials. The thickness, material and processing technology of the insulating layer need to be optimized according to the operating voltage of the battery cell 1 and the safety requirements of the battery pack.

[0056] In this way, by sequentially stacking the flow channel plate, substrate, and insulating layer, the first cold plate 2 can not only effectively improve the heat dissipation capacity of the battery pack, but also ensure electrical safety while ensuring heat dissipation, avoiding failures caused by electrical contact. Specifically, the first cold plate 2 is connected to the battery cell 1 and busbar 3 through the insulating layer, so that the first cold plate 2 maintains good electrical isolation from the battery cell 1 and busbar 3, while the flow channel plate and substrate provide sufficient heat conduction channels, ensuring the stability and safety of the battery pack during fast charging or high-load operation.

[0057] Optionally, the first cold plate 2 is bonded to the battery module using thermally conductive structural adhesive.

[0058] Specifically, the thermally conductive structural adhesive possesses high thermal conductivity, insulation, and good adhesion. The insulating layer of the first cold plate 2 is bonded to the busbar 3 of the battery module using this thermally conductive structural adhesive. This ensures electrical isolation while providing a good heat conduction path, effectively transferring the heat generated by the battery cell 1 to the first cold plate 2 for heat dissipation via the busbar 3, and ensuring the stability of the connection between the first cold plate 2 and the busbar 3. Furthermore, based on the protrusion 21 provided on the first cold plate 2, the insulating layer is also connected to the battery cell 1 at the protrusion 21 using thermally conductive structural adhesive. This ensures electrical isolation while providing a good heat conduction path, effectively transferring the heat generated by the battery cell 1 to the first cold plate 2 for heat dissipation, and ensuring the stability of the connection between the protrusion 21 and the battery cell 1.

[0059] Optionally, the second cold plate 4 includes a flow channel plate, a substrate, and an insulating layer stacked sequentially. The second cold plate 4 is connected to the battery cell 1 through the insulating layer. Thus, by sequentially stacking and connecting the flow channel plate, substrate, and insulating layer, the second cold plate 4 not only effectively improves the heat dissipation capacity of the battery pack but also ensures electrical safety while guaranteeing heat dissipation, preventing malfunctions caused by electrical contact. Specifically, the connection between the second cold plate 4 and the battery cell 1 through the insulating layer maintains good electrical isolation between them, while the flow channel plate and substrate provide ample heat conduction channels, ensuring the stability and safety of the battery pack during fast charging or high-load operation.

[0060] Optionally, the insulating layer of the second cold plate 4 is bonded to the battery cell 1 of the battery module using thermally conductive structural adhesive. The thermally conductive structural adhesive has high thermal conductivity and good adhesion performance, which can provide a good heat conduction path while ensuring electrical isolation, effectively conduct the heat generated by the battery cell 1 to the cold plate for heat dissipation, and ensure the stability of the connection between the second cold plate 4 and the battery cell 1.

[0061] Optionally, combined Figure 4 As shown, the battery pack also includes a housing 5 for accommodating the battery cell 1, with a first cold plate 2 connected to one end of the housing 5 and a second cold plate 4 connected to the other end of the housing 5.

[0062] In this embodiment, to further improve the structural stability and installation convenience of the battery pack, the battery includes a housing 5 for accommodating multiple battery cells 1. The housing 5 has an internal cavity for accommodating the battery cells 1, providing installation space while also offering support and protection to prevent or mitigate external impacts. The battery pack is connected to an external structure via the housing 5, enabling its installation, such as connecting the battery pack to a vehicle body. The housing 5 is connected to the first cold plate 2 and the second cold plate 4, allowing for their installation and fixation, further enhancing the overall structural stability of the battery pack. For example, the first cold plate 2, the second cold plate 4, and the housing 5 can be connected by adhesive, screws, or other methods to ensure a tight fit between the cold plates and the housing 5, thereby enhancing the battery pack's shock resistance and overall structural robustness.

[0063] Another embodiment of the present invention provides a vehicle including the battery pack described above.

[0064] In this embodiment, the vehicle employs the aforementioned battery pack to enhance its safety and reliability. Specifically, the battery cells 1 within the battery pack are connected via a busbar 3 with a groove 31. The busbar 3 is welded to the output electrode 11 of the battery cell 1 through the bottom wall 31a of the groove 31. The side of the busbar 3 facing away from the battery cell 1 is connected to the first cold plate 2. This ensures that even if weld slag or irregular weld seams are generated during the welding of the output electrode 11 of the battery cell 1 to the busbar 3, these weld slag or irregular weld seams are located within the groove 31 and do not directly contact the first cold plate 2. This effectively prevents the weld slag or irregular weld seams from directly contacting the first cold plate 2 and potentially damaging the insulation layer of the first cold plate 2, thus avoiding a short circuit in the busbar 3 and improving the safety and reliability of the battery pack. In addition, the first cold plate 2 is connected to the busbar 3 to dissipate the heat generated by the cell 1 during operation in a timely and efficient manner, especially the heat near the output electrode 11 of the cell 1. This effectively reduces the temperature of the output electrode 11 and the cell 1 as a whole, avoiding the safety hazards caused by the large amount of heat generated due to the limited overcurrent area of ​​the output electrode 11 when the cell 1 is charged with high current (corresponding to fast charging) or discharged with high current (corresponding to high load). This ensures the safety and reliability of the battery pack under fast charging and high load conditions.

[0065] Optionally, the output terminal 11 of the battery cell 1 of the battery pack is positioned facing the vehicle body, and the explosion-proof valve 12 of the battery cell 1 is located at the end of the battery cell 1 away from the vehicle body.

[0066] In this embodiment, to further enhance vehicle safety, the output terminal 11 of the battery cell 1 is designed to face the vehicle body, while the explosion-proof valve 12 is located at the end of the battery cell 1 away from the vehicle body. This design effectively reduces the safety risks of the vehicle in extreme situations. For example, when the battery cell 1 experiences thermal runaway or an abnormal increase in internal pressure, the location of the explosion-proof valve 12 can guide the high-temperature gas and heat away from the vehicle body and interior space to the maximum extent, thus protecting the safety of the driver and passengers. Specifically, when the output terminal 11 of the battery cell 1 faces the vehicle body, the output terminal 11 is connected to the busbar 3 and the cold plate to realize the current output and heat dissipation functions of the battery cell 1; while the explosion-proof valve 12 is located at the end of the battery cell 1 away from the vehicle body, serving as a safety protection device for the battery cell 1. It is used to quickly release pressure when the internal pressure of the battery cell 1 abnormally increases, preventing the battery cell 1 from exploding or other safety accidents due to excessive pressure. By placing the explosion-proof valve 12 at the end away from the vehicle body, when the explosion-proof valve 12 is activated to release high-temperature gas, the gas and the accompanying heat will not directly impact the vehicle's internal structure and personnel, thereby significantly reducing safety hazards.

[0067] For example, when a vehicle adopts CTB (Cell-to-Body) technology, the battery pack cover is further integrated with the vehicle floor. This design places higher demands on the battery pack's heat dissipation and safety. If cell 1 experiences thermal runaway, the design of the output terminal 11 facing the vehicle body ensures more stable connection and heat dissipation of cell 1, while the design of the explosion-proof valve 12 facing outwards can quickly expel high-temperature gases to the outside of the vehicle in extreme situations, preventing damage to the vehicle body structure due to high-temperature impact, while ensuring the safety of the occupants.

[0068] Although the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A battery pack, characterized in that, The battery module includes a battery module and a first cold plate (2). The battery module includes a battery cell (1) and a busbar (3). The busbar (3) is located at the end of the battery cell (1) where an output electrode (11) is provided. The side of the busbar (3) away from the battery cell (1) is provided with a groove (31). The busbar (3) is welded to the output electrode (11) at the bottom wall (31a) of the groove (31). The first cold plate (2) is located at the end of the battery module where the busbar (3) is provided. The side of the first cold plate (2) facing the battery cell (1) of the battery module is at least in contact with the side of the busbar (3) away from the battery cell (1).

2. The battery pack as described in claim 1, characterized in that, The bottom wall (31a) of the tank is provided with a positioning hole for accommodating the output electrode (11), and the bottom wall (31a) of the tank is welded to the output electrode (11) at the positioning hole.

3. The battery pack as described in claim 2, characterized in that, The explosion-proof valve (12) of the battery cell (1) is located at one end of the battery cell (1) away from the busbar (3).

4. The battery pack as described in any one of claims 1-3, characterized in that, It also includes a second cold plate (4), which is disposed at one end of the battery module away from the first cold plate (2) and connected to the battery cell (1) of the battery module; and the second cold plate (4) has an avoidance hole at the explosion-proof valve (12) of the battery cell (1).

5. The battery pack as described in any one of claims 1-3, characterized in that, The first cold plate (2) is provided with a protrusion (21) that protrudes toward the battery module, and the protrusion (21) abuts against the part other than the output electrode (11) of the battery cell (1) of the battery module.

6. The battery pack as described in claim 5, characterized in that, The output pole (11) includes a first output pole (11a) and a second output pole (11b), the first output pole (11a) and the second output pole (11b) being spaced apart at one end of the cell (1) facing the first cold plate (2); the protrusion (21) is located between the first output pole (11a) and the second output pole (11b).

7. The battery pack as described in any one of claims 1-3, characterized in that, The first cold plate (2) has an insulating layer on the side facing the battery cell (1) of the battery module; And / or, the first cold plate (2) is bonded to the battery module using thermally conductive structural adhesive.

8. A vehicle, characterized in that, Includes the battery pack as described in any one of claims 1-7.

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