An integrated busbar, battery thermal management system and power battery

Abstract

This application relates to an integrated busbar, a battery thermal management system, and a power battery, belonging to the field of power battery technology. The integrated busbar is disposed between the cell module and the liquid cooling plate, with thermally conductive adhesive filling the space between the integrated busbar and the liquid cooling plate. The integrated busbar includes a blister tray, a flexible circuit board, and multiple current-guiding busbars. The blister tray includes a tray body with a first groove and a second groove, and multiple first grooves. Multiple current-guiding busbars are correspondingly arranged within the first grooves, and each current-guiding busbar is connected to the terminal post of two adjacent cells. The flexible circuit board is disposed within the second groove and connected to the current-guiding busbars. The thermally conductive adhesive fills the first grooves and covers the current-guiding busbars. The integrated busbar provided by this application can reduce the amount of thermally conductive adhesive used without affecting the working performance of the integrated busbar and other components such as the liquid cooling plate, thereby reducing the overall weight and cost of the battery pack.

Description

Technical Field

[0001] This application relates to the field of power battery technology, specifically to an integrated busbar, battery thermal management system, and power battery. Background Technology

[0002] The assembly process of power batteries involves several steps, including cell assembly, liquid cooling plate assembly, and module placement. After multiple cells are bundled and secured with end plates and other structures, a liquid cooling plate is installed to dissipate heat and cool the cells, and an integrated busbar is used for overall battery monitoring and control.

[0003] In existing technologies, common power battery cooling solutions include top-bottom cooling solutions, which typically involve placing liquid cooling plates on the top and bottom surfaces of the battery cell. In this case, an integrated busbar is also required between the liquid cooling plate on the top surface of the battery cell and the battery cell, and thermally conductive materials such as thermally conductive adhesive are usually filled between the integrated busbar and the liquid cooling plate to improve heat dissipation and cooling effect.

[0004] However, in actual use, since the integrated busbar is usually set as a whole planar structure, the thermally conductive adhesive usually flows and spreads all over the integrated busbar, resulting in an increase in the amount of adhesive used, which in turn increases the overall weight and cost of the battery.

[0005] Therefore, there is an urgent need to provide a new cooling solution that can reduce the amount of thermal conductive adhesive used, thereby reducing the overall weight and cost of the battery pack, without affecting the working performance of components such as the integrated busbar and liquid cooling plate. Utility Model Content

[0006] The purpose of this application is to provide an integrated busbar, battery thermal management system and power battery, which can reduce the amount of thermal conductive adhesive used and reduce the overall weight and cost of the battery pack without affecting the working effect of the integrated busbar and liquid cooling plate and other components.

[0007] To achieve the above objectives, in a first aspect, this application provides an integrated busbar disposed between a battery cell module and a liquid cooling plate, with thermally conductive adhesive filling the space between the integrated busbar and the liquid cooling plate. The integrated busbar includes a blister tray, a flexible circuit board, and multiple current-guiding busbars. The blister tray includes a tray body with a first groove and a second groove. Multiple first grooves are provided, and their arrangement direction is parallel to the extension direction of the second grooves. Multiple current-guiding busbars are correspondingly arranged within the first grooves, and each current-guiding busbar is connected to the terminal of two adjacent battery cells to conduct electricity between the two adjacent cells. The flexible circuit board is disposed within the second groove and connected to the current-guiding busbars. The thermally conductive adhesive fills the first groove and covers the current-guiding busbars.

[0008] Based on the embodiments described above, during the assembly of the power battery, multiple battery cells are first fixed together to form a battery cell module. Then, an integrated busbar is fixed to one end of the battery cell module where the upper electrode is located, for connecting individual battery cells. Simultaneously, parameters such as the overall temperature and voltage of the battery cell module are collected and controlled. Finally, a liquid cooling plate is used to cool the battery cell module through heat conduction. Furthermore, by injecting thermally conductive adhesive between the liquid cooling plate and the integrated busbar, the heat conduction effect from the battery cell module and the integrated busbar to the liquid cooling plate is enhanced, thereby improving the cooling efficiency.

[0009] With the aforementioned configuration of this application, the first and second grooves are used for the placement and fixation of the reverse busbar and the flexible circuit board, respectively, and the current-guiding busbar also enables the connection between the individual battery cells. When applying thermally conductive adhesive, it is precisely injected into the first groove, achieving precise injection and ensuring good heat dissipation and cooling in the high-heat-generating area of ​​the terminals. Simultaneously, it reduces the amount of thermally conductive adhesive used, lowering the overall weight and cost of the power battery. Furthermore, it prevents thermally conductive adhesive overflow from affecting other components.

[0010] In some embodiments, the blister tray includes at least two sets of first grooves and at least one set of second grooves, with each set of second grooves disposed between two sets of first grooves. Each set of first grooves includes a plurality of first grooves arranged in sequence, and each set of second grooves includes at least one second groove parallel to the arrangement direction of the first grooves.

[0011] Based on the embodiments described above, when the battery cell module is assembled, multiple battery cells are arranged and assembled sequentially. At this time, the terminals on both sides of the battery cell are connected to the adjacent battery cell via a current-conducting busbar. Therefore, two current-conducting busbars are needed to connect one row of battery cells, and two sets of first grooves are correspondingly used for fixing the current-conducting busbars. The flexible circuit board is usually located in the middle of the battery cell and is connected to the terminal position via a data acquisition module extending to both sides to achieve parameter acquisition. Therefore, only one set of flexible circuit boards is needed for one row of battery cells, and a corresponding second groove is provided to hold the flexible circuit board. In actual use, the battery cell module can include multiple rows of battery cells simultaneously, so the number of rows of first and second grooves on the integrated busbar needs to be increased accordingly.

[0012] In some embodiments, a connecting groove is formed on the sidewall of the first groove, connecting the first groove and the second groove. A data acquisition piece is connected to the flexible circuit board, the data acquisition piece is attached to the current-guiding busbar, and is connected to the flexible circuit board through the connecting groove. The data acquisition piece is attached to the side of the current-guiding busbar facing the battery cell module.

[0013] Based on the embodiments described above, the data acquisition chip is attached to the current-conducting busbar to monitor and collect parameters such as the temperature and resistance of the battery cells, thereby monitoring and regulating the operating status of the power battery. The connection slot facilitates the installation of the data acquisition chip and the corresponding connecting harness. Since the thermally conductive adhesive is applied to the side of the current-conducting busbar facing the liquid cooling plate, attaching the data acquisition chip to the side of the current-conducting busbar facing the battery cell module (i.e., the side of the current-conducting busbar away from the liquid cooling plate) separates the data acquisition chip from the thermally conductive adhesive. This reduces the possibility of fatigue failure of the data acquisition chip due to the thermally conductive adhesive layer pulling on it under vibration conditions, thus extending the service life of the data acquisition chip and ensuring effective data collection.

[0014] In some embodiments, the distance between the edge of the guide busbar and the sidewall of the first groove is L, where L≤3mm.

[0015] Based on the embodiments described above, by leaving a certain gap between the edge of the guide busbar and the sidewall of the first groove, the installation and fixing of the guide busbar can be facilitated. At the same time, by limiting the size of the gap, problems such as glue leakage during glue injection due to excessive gap are avoided.

[0016] In some embodiments, the thickness of the thermally conductive adhesive is less than or equal to 8 mm.

[0017] Based on the above embodiments of this application, thermally conductive adhesive is filled between the current-conducting busbar and the liquid cooling plate to improve heat conduction efficiency. By limiting the thickness of the thermally conductive adhesive, excessive thickness of the thermally conductive adhesive is avoided, thereby avoiding the cost increase caused by the increase in the amount of thermally conductive adhesive used, as well as the impact of excessive thermally conductive adhesive thickness on the overall thickness of the power battery.

[0018] In some embodiments, a protrusion is provided on the sidewall of the first groove, and the protrusion is formed on the sidewall of the first groove in a horizontal direction.

[0019] Based on the embodiments described above, by setting protrusions as a reference during adhesive injection, the amount of adhesive injected can be precisely controlled, ensuring thermal conductivity while reducing waste. Furthermore, after adhesive injection, a liquid cooling plate needs to be installed, which requires contact with the thermally conductive adhesive. By setting protrusions, the problem of adhesive overflow caused by pressure during the downward installation of the liquid cooling plate can be avoided to some extent, further ensuring the adhesive injection effect and thus guaranteeing subsequent heat dissipation and cooling performance.

[0020] In some embodiments, a clearance hole is provided in the second groove, the position of which corresponds to the position of the cell explosion-proof valve. A terminal hole is provided in the first groove, through which the cell's terminal passes and connects to the current-conducting busbar.

[0021] Based on the above embodiments of this application, an avoidance hole is provided to avoid obstructing the position of the explosion-proof valve, thus preventing interference with the opening of the explosion-proof valve in an emergency. Furthermore, by providing a pole post hole, the end of the pole post passes through the pole post hole during assembly and directly contacts and connects with the current-conducting busbar, thereby enabling conductive connection between adjacent battery cells via the current-conducting busbar.

[0022] According to a second aspect of this application, a battery thermal management system is provided, the battery thermal management system including a liquid cooling plate and the aforementioned integrated busbar, the integrated busbar being disposed between the liquid cooling plate and the cell module, and a first groove being filled with thermally conductive adhesive to transfer heat between the cell module and the liquid cooling plate.

[0023] Based on the above embodiments of this application, the battery thermal management system provided by this application includes the above-mentioned integrated busbar. Through the above settings, the integrated busbar is divided into regions, and the region where the current-guiding busbar is located is further divided into multiple individual first grooves. During glue injection, glue can be injected into each current-guiding groove individually, thereby achieving precise glue injection, thereby reducing the amount of thermal conductive glue used, reducing the overall weight of the power battery and reducing costs.

[0024] In some embodiments, the battery thermal management system further includes a plurality of thermal pads, which are attached and fixed to the side of the liquid cooling plate facing the integrated busbar, and the plurality of thermal pads are correspondingly disposed with a plurality of first grooves. The lower surface of the thermal pad abuts against the upper surface of the thermally conductive adhesive, and the sidewall of the thermal pad abuts against the sidewall of the first groove and the boss.

[0025] Based on the above embodiments of this application, by setting a thermal pad and having the thermal pad corresponding to the first groove, the thermal pad and the thermally conductive adhesive in the first groove can make contact and cooperate. Compared with the method of the thermally conductive adhesive directly contacting the liquid cooling plate, the setting of the thermal pad can make the contact more reliable, the heat conduction path more stable, and ensure the heat conduction efficiency between the flow busbar and the liquid cooling plate through the thermally conductive adhesive.

[0026] According to a third aspect of this application, a power battery is provided, the power battery including a cell module and the aforementioned battery thermal management system, an integrated busbar is disposed at one end of the cell module where the terminals are located, and a liquid cooling plate is disposed on the side of the integrated busbar away from the cell module.

[0027] Based on the above embodiments of this application, the power battery provided by this application includes the above-mentioned battery thermal management system, and therefore also has the above-mentioned beneficial effects. To avoid repetition, it will not be described again here.

[0028] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0029] The accompanying drawings are provided to further illustrate the present application and form part of the specification. They are used together with the following detailed description to explain the present application, but do not constitute a limitation thereof. In the drawings:

[0030] Figure 1 This is an exploded view of the integrated busbar provided in an embodiment of this application.

[0031] Figure 2 yes Figure 1 An enlarged schematic diagram of part A in the middle.

[0032] Figure 3 This is a planar schematic diagram of the integrated busbar provided in an embodiment of this application.

[0033] Figure 4 This is a schematic diagram of the structure of the blister tray in the integrated busbar provided in the embodiment of this application.

[0034] Figure 5 yes Figure 4 Enlarged diagram of part B.

[0035] Figure 6 This is an exploded schematic diagram of the power battery provided in the embodiments of this application.

[0036] Explanation of reference numerals in the attached figures

[0037] 1. Battery cell module; 2. Liquid cooling plate; 3. Thermal conductive adhesive; 4. Blister tray; 41. Tray body; 42. First groove; 43. Second groove; 44. Connecting groove; 45. Protrusion; 46. Clearance hole; 47. Terminal hole; 5. Busbar; 6. Flexible circuit board; 61. Acquisition plate; 7. Thermal pad. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0041] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0042] In the description of this application, it should be noted that, unless otherwise stated, the terms "inner," "outer," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0043] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0044] In existing technologies, common power battery cooling solutions include top-bottom cooling solutions, which typically involve placing liquid cooling plates on the top and bottom surfaces of the battery cell. In this case, an integrated busbar is also required between the liquid cooling plate on the top surface of the battery cell and the battery cell, and thermally conductive materials such as thermally conductive adhesive are usually filled between the integrated busbar and the liquid cooling plate to improve heat dissipation and cooling effect.

[0045] However, in actual use, since the integrated busbar is usually set as a whole planar structure, the thermally conductive adhesive usually flows and spreads all over the integrated busbar, resulting in an increase in the amount of adhesive used, which in turn increases the overall weight and cost of the battery.

[0046] Therefore, there is an urgent need to provide a new cooling solution that can reduce the amount of thermal conductive adhesive used, thereby reducing the overall weight and cost of the battery pack, without affecting the working performance of components such as the integrated busbar and liquid cooling plate.

[0047] To address the aforementioned problems in the prior art, this application provides an integrated busbar disposed between the battery cell module 1 and the liquid cooling plate 2, with thermally conductive adhesive 3 filling the space between the integrated busbar and the liquid cooling plate 2. (Reference) Figures 1 to 3 As shown, the integrated busbar includes a blister tray 4, a flexible circuit board 6, and multiple flow-guiding busbars 5. The blister tray 4 includes a tray body 41, on which a first groove 42 and a second groove 43 are provided. Multiple first grooves 42 are provided, and their arrangement direction is parallel to the extending direction of the second grooves 43. Multiple flow-guiding busbars 5 are correspondingly arranged within the first grooves 42, and each flow-guiding busbar 5 is connected to the terminal of two adjacent battery cells to conduct electricity between them. The flexible circuit board 6 is disposed within the second groove 43 and connected to the flow-guiding busbars 5. Thermally conductive adhesive 3 fills the first groove 42 and covers the flow-guiding busbars 5.

[0048] Based on the embodiments described above, during the assembly of the power battery, multiple battery cells are first fixed together to form a battery cell module 1 by bundling or other methods. Then, an integrated busbar is fixed to one end of the battery cell module 1 where the upper electrode post is located, for connecting individual battery cells. Simultaneously, parameters such as the overall temperature and voltage of the battery cell module 1 are collected and controlled. Finally, a liquid cooling plate 2 is installed to cool the battery cell module 1 through heat conduction. Furthermore, by injecting thermally conductive adhesive 3 between the liquid cooling plate 2 and the integrated busbar, the heat conduction effect from the battery cell module 1 and the integrated busbar to the liquid cooling plate 2 is enhanced, thereby improving the heat dissipation and cooling efficiency.

[0049] With the aforementioned configuration of this application, the first groove 42 and the second groove 43 are used for the placement and fixation of the reverse busbar and the flexible circuit board 6, respectively, and the current-guiding busbar 5 can also realize the connection between each cell. At this time, when applying the thermally conductive adhesive 3, it is precisely applied into the first groove 42, achieving precise application and ensuring good heat dissipation and cooling in the high-heat-generating area of ​​the terminal post. Simultaneously, it reduces the amount of thermally conductive adhesive 3 used, lowering the overall weight and cost of the power battery. Furthermore, it avoids the impact of thermally conductive adhesive 3 overflow on other components.

[0050] Specifically, during the assembly of cell module 1, multiple cells are arranged in a row, with any two adjacent cells facing opposite directions; that is, the positive terminal of any cell is on the same side as the negative terminal of the adjacent cell. Then, the terminals of two adjacent cells are connected via a current-conducting busbar 5, achieving grouped conduction between the cells. In use, the terminals serve as the input and output terminals for the cell current, while the current-conducting busbar 5 acts as a current-passing structure between the cells. Therefore, compared to other locations on cell module 1, the areas where the terminals and current-conducting busbar 5 are located experience more significant heat generation during charging and discharging.

[0051] By precisely injecting the thermally conductive adhesive 3 into the first groove 42 through the above-mentioned settings of this application, not only can the amount of adhesive injected be precisely controlled, but the thermally conductive adhesive 3 can also be precisely covered to the busbar 5, thereby improving the heat dissipation and cooling effect at the location of the busbar 5, and thus maximizing the overall heat dissipation and cooling effect of the power battery even with a limited amount of thermally conductive adhesive 3.

[0052] refer to Figures 1 to 3 As shown in some embodiments of this application, the blister tray 4 may include at least two sets of first grooves 42 and at least one set of second grooves 43, with each set of second grooves 43 disposed between two sets of first grooves 42. Each set of first grooves 42 includes a plurality of first grooves 42 arranged in sequence, and each set of second grooves 43 includes at least one second groove 43 parallel to the arrangement direction of the first grooves 42.

[0053] Based on the embodiments described above, when the battery cell module 1 is assembled, multiple battery cells are arranged and assembled sequentially. At this time, the terminals on both sides of the battery cell are connected to the adjacent battery cell via the current-conducting busbar 5. Therefore, two current-conducting busbars 5 are required to connect one row of battery cells, and two sets of first grooves 42 are correspondingly used for fixing the current-conducting busbars 5. The flexible circuit board 6 is usually located in the middle of the battery cell and is connected to the terminal position via acquisition modules extending to both sides to achieve parameter acquisition. Therefore, only one set of flexible circuit boards 6 is needed for one row of battery cells, and one set of second grooves 43 is correspondingly provided to place the flexible circuit board 6. In actual use, the battery cell module 1 can include multiple rows of battery cells simultaneously, therefore, the number of rows of first grooves 42 and second grooves 43 on the integrated busbar needs to be increased accordingly.

[0054] Specifically, in actual use, the number of rows of the first groove 42 and the second groove 43 can be set according to the number of rows of battery cells. Each row of battery cells needs to be set with two rows of first grooves 42 and one row of second grooves 43. For example, four rows of first grooves 42 and two rows of second grooves 43 are set to correspond to two rows of battery cells, or six rows of first grooves 42 and three rows of second grooves 43 are set to correspond to three rows of battery cells.

[0055] In the specific setup, each module consists of two rows of first grooves 42 and one row of second grooves 43, with the two rows of first grooves 42 located on either side of the second grooves 43. Multiple modules are then configured according to the number of rows and arrangement direction of the battery cells.

[0056] After the battery cell module 1 is assembled, real-time monitoring and control are required during the process. Sensors are used to monitor various parameters of the battery cell module 1, such as voltage. In actual use, the sensors are connected to the flexible circuit board 6 for data acquisition, feedback, and control.

[0057] Specifically, refer to Figure 4 and Figure 5As shown, in some embodiments of this application, a connecting groove 44 is provided on the sidewall of the first groove 42, and the connecting groove 44 connects the first groove 42 and the second groove 43. A sampling piece 61 is connected to the flexible circuit board 6, the sampling piece 61 is attached to the guide busbar 5, and is connected to the flexible circuit board 6 through the connecting groove 44.

[0058] Based on the embodiments described above, the data acquisition chip 61 is attached to the current-conducting busbar 5 to monitor and collect parameters such as the temperature and resistance of the battery cells, thereby monitoring and regulating the operating status of the power battery. The connection slot 44 facilitates the installation of the data acquisition chip 61 and the corresponding connecting harness.

[0059] Furthermore, the specific type and quantity of the data acquisition chip 61 can be selected according to the actual situation in practical use. Typically, the data acquisition chip 61 may include a nickel plate and a negative temperature coefficient thermistor (NTC). The nickel plate is attached to the current-conducting busbar 5 for voltage data acquisition at the location of the current-conducting busbar 5 and the battery cell terminal, while the negative temperature coefficient thermistor is used to acquire resistance data at the location of the current-conducting busbar 5 and the battery cell terminal.

[0060] Furthermore, the connecting groove 44 facilitates the insertion and fixing of the nickel sheet or other collecting plates 61. To ensure the collecting plate 61 can pass through smoothly, the size of the connecting groove 44 must be larger than the size of the collecting plate 61. Simultaneously, to prevent the thermally conductive adhesive 3 in the first groove 42 from overflowing into the second groove 43 through the connecting groove 44, the size of the connecting groove 44 should not be too large. Specifically, the distance between the connecting groove 44 and the edge of the collecting plate 61 can be set within 5mm. Since the thermally conductive adhesive 3 has a certain degree of viscosity and some fluidity, it does not flow freely like water. Therefore, the aforementioned spacing limitation facilitates the insertion and assembly of the collecting plate 61 while preventing the thermally conductive adhesive 3 from overflowing into the second groove 43 through the connecting groove 44.

[0061] Furthermore, it should be noted that the flexible circuit board 6 and the data acquisition chip 61 described above can all be used as part of a battery management system (BMS) for monitoring and regulating the power battery during its use. In practical applications, the battery management system is not limited to the above components; for example, it may also include an overload protection module and a communication module. The specific configuration can be tailored to the actual situation. Since this application does not involve improvements to the battery management system structure, no specific limitations are imposed.

[0062] Based on the above technical solutions, further references Figure 1 and Figure 2As shown in some embodiments of this application, the acquisition piece 61 can be attached to the side of the current busbar 5 facing the cell module 1.

[0063] Based on the above embodiments of this application, the acquisition piece 61 is attached to the side of the current-conducting busbar 5 facing the cell module 1, that is, the side of the current-conducting busbar 5 away from the liquid cooling plate 2. Since the thermally conductive adhesive 3 is injected onto the side of the current-conducting busbar 5 facing the liquid cooling plate 2, the acquisition piece 61 and the thermally conductive adhesive 3 can be separated at this time. This reduces the possibility of fatigue failure of the acquisition piece 61 caused by the thermally conductive adhesive 3 layer pulling on the acquisition piece 61 under vibration conditions, thereby extending the service life of the acquisition piece 61 and ensuring the acquisition effect.

[0064] In some embodiments of this application, the distance between the edge of the guide busbar 5 and the sidewall of the first groove 42 is L, where L≤3mm.

[0065] Based on the above embodiments of this application, by leaving a certain gap between the edge of the guide busbar 5 and the sidewall of the first groove 42, the installation and fixing of the guide busbar 5 can be facilitated. At the same time, by limiting the size of the gap between the two, problems such as glue leakage during glue injection due to excessive gap are avoided.

[0066] Specifically, in actual use, a certain gap is set between the edge of the current guide busbar 5 and the side wall of the first groove 42 to facilitate the assembly of the current guide busbar 5 and the first groove 42. However, at the same time, the larger the gap between the two, the larger the volume of the first groove 42, which in turn leads to a larger amount of thermal conductive adhesive 3 required, which not only increases the overall weight of the battery pack but also increases the cost. Therefore, the gap between the two needs to be set within a suitable range.

[0067] In actual use, the specific distance between the edge of the guide busbar 5 and the side wall of the first groove 42 can be set to multiple specific values ​​such as 1mm, 2mm or 3mm, and this application does not impose specific restrictions on this.

[0068] Further, refer to Figure 4 and Figure 5 As shown, in some embodiments of this application, a protrusion 45 may be provided on the sidewall of the first groove 42, and the protrusion 45 is formed on the sidewall of the first groove 42 in a horizontal direction.

[0069] Based on the embodiments described above, the protrusion 45 is used as a reference during adhesive application to precisely control the amount of adhesive applied, ensuring thermal conductivity while reducing waste. Furthermore, after adhesive application, the liquid cooling plate 2 needs to be installed, and the liquid cooling plate 2 needs to contact the thermally conductive adhesive 3. By providing the protrusion 45, the problem of adhesive overflow caused by pressure during the downward installation of the liquid cooling plate 2 can be avoided to some extent, further ensuring the adhesive application effect and thus guaranteeing subsequent heat dissipation and cooling performance.

[0070] Specifically, the protrusion 45 is first used as a reference during adhesive injection. Then, when the liquid cooling plate 2 is installed, if the plate or other structure of the liquid cooling plate 2 is pressed into the first groove 42, the thermally conductive adhesive 3 in the first groove 42 will tend to overflow upwards under pressure. At this time, the protrusion 45 on the side wall of the first groove 42 can act as a barrier, reducing the amount of thermally conductive adhesive 3 overflowing and, to a certain extent, preventing the overflowing thermally conductive adhesive 3 from affecting other components.

[0071] Furthermore, in this application, the amount of adhesive injected is controlled by the protrusion 45, thereby controlling the final thickness of the thermally conductive adhesive 3. In practical use, the thickness of the thermally conductive adhesive 3 can be limited to less than or equal to 8mm, but it should also be avoided that the thickness of the thermally conductive adhesive 3 is too small, resulting in ineffective coverage of the thermally conductive busbar 5. For example, the thickness of the thermally conductive adhesive 3 can be set to multiple specific values ​​such as 5mm, 6mm, 7mm, and 8mm. By limiting the thickness of the thermally conductive adhesive 3, excessive thickness of the thermally conductive adhesive 3 is avoided, thereby avoiding the increased cost caused by increased use of the thermally conductive adhesive 3, as well as the impact of excessive thickness of the thermally conductive adhesive 3 on the overall thickness of the power battery.

[0072] Meanwhile, since there is usually a certain gap between the edge of the thermally conductive busbar 5 and the sidewall of the first groove 42, the thickness of the edge of the thermally conductive adhesive 3 is usually greater than the thickness of the central area due to the fluidity of the thermally conductive adhesive 3 itself. The above-mentioned limitation on the thickness of the thermally conductive adhesive 3 refers to the thickness of the central area of ​​the thermally conductive adhesive 3, that is, the effective thickness of the thermally conductive adhesive 3 located between the flow-guiding busbar 5 and the liquid cooling plate 2.

[0073] Furthermore, it should be noted that, through the above-mentioned configuration in this application, namely, dividing the integrated busbar into regions and further dividing the area where the guide busbar 5 is located into a first groove 42 adapted to the shape of a single guide busbar 5, precise glue injection is achieved. Beyond this, other specific structures of the integrated busbar can be designed according to actual usage requirements. For example, refer to... Figure 4 and Figure 5 As shown, in some embodiments of this application, a clearance hole 46 may be provided in the second groove 43, and the position of the clearance hole 46 corresponds to the position of the cell explosion-proof valve. A terminal hole 47 may be provided in the first groove 42, and the terminal of the cell passes through the terminal hole 47 to connect with the current-conducting busbar 5.

[0074] Based on the above embodiments of this application, the position of the explosion-proof valve is avoided by setting the clearance hole 46, so as to avoid affecting the opening of the explosion-proof valve in an emergency. By setting the pole hole 47, the end of the pole passes through the pole hole 47 during assembly and directly contacts and connects with the current-conducting busbar 5, thereby connecting and conducting between adjacent cells through the current-conducting busbar 5.

[0075] Meanwhile, with the aforementioned clearance hole 46 and pole hole 47, the specific structure of the current guide bus 5 and the flexible circuit board 6 can be configured according to the actual situation. For example, the current guide bus 5 can be provided with a recess to facilitate pole fitting and welding fixation, and the flexible circuit board 6 can also be provided with a corresponding clearance structure at the location of the clearance hole 46 to avoid affecting the opening of the explosion-proof valve. Specifically, the structure of the current guide bus 5 and the flexible circuit board 6 in the prior art can be referred to and adapted according to the actual situation. This application does not impose specific limitations in this regard.

[0076] Based on the above-mentioned basic solution, this application also provides a battery thermal management system, with reference to... Figure 6 As shown, the battery thermal management system includes a liquid cooling plate 2 and the aforementioned integrated busbar. The integrated busbar is disposed between the liquid cooling plate 2 and the cell module 1, and the first groove 42 is filled with thermally conductive adhesive 3 to transfer heat between the cell module 1 and the liquid cooling plate 2.

[0077] Based on the above embodiments of this application, the battery thermal management system provided by this application includes the above-mentioned integrated busbar. Through the above settings, the integrated busbar is divided into regions, and the region where the current-guiding busbar 5 is located is further divided into multiple individual first grooves 42. During glue injection, glue can be injected into each current-guiding groove individually, thereby achieving precise glue injection, thereby reducing the amount of thermal conductive glue 3 used, reducing the overall weight of the power battery and reducing costs.

[0078] In some embodiments of this application, reference is made to Figure 6 As shown, the battery thermal management system also includes multiple thermal pads 7, which are attached and fixed to the side of the liquid cooling plate 2 facing the integrated busbar, and the multiple thermal pads 7 are correspondingly arranged with multiple first grooves 42. The lower surface of the thermal pad 7 abuts against the upper surface of the thermally conductive adhesive 3, and the sidewall of the thermal pad 7 abuts against the sidewall of the first groove 42 and the boss.

[0079] Based on the above embodiments of this application, by setting a thermal pad 7 and having the thermal pad 7 corresponding to the first groove 42, the thermal pad 7 and the thermal adhesive 3 in the first groove 42 can make contact and cooperate. Compared with the method of the thermal adhesive 3 directly contacting the liquid cooling plate 2, the setting of the thermal pad 7 can make the contact more reliable, the heat conduction path more stable, and ensure the heat conduction efficiency of the busbar 5 through the thermal adhesive 3 to the liquid cooling plate 2.

[0080] During the assembly of the power battery, after the cell module 1 and the integrated busbar and other structures are installed, the thermal pad 7 is also pre-fixed to the liquid cooling plate 2 by adhesive or other means. Then, the liquid cooling plate 2 is pressed down towards the cell module 1, and the thermal pad 7 is pressed down into the first groove 42 until the bottom surface of the thermal pad 7 contacts the thermally conductive adhesive 3. During this process, by setting the sidewall of the thermal pad 7 to cooperate and abut with the sidewall of the first groove 42 and the boss, the thermal pad 7 can abut with the sidewall of the first groove 42 and the boss when pressed down, so as to prevent the thermally conductive adhesive 3 from overflowing.

[0081] Specifically, the thermal pad 7 can be fixed to the side of the liquid cooling plate 2 facing the battery module 1 by means of adhesive or other methods. Meanwhile, the thermal pad 7 should be made of a material with good thermal conductivity; for example, an organosilicon thermal pad 7 sheet can be used, with silicone rubber as the base material, and then filled with thermally conductive fillers such as alumina. The specific material can be selected according to the actual situation, and this application does not impose specific restrictions on it.

[0082] When the power battery is in use, the heat generated by the cell module 1 is concentrated in the part where the terminal post and the current-conducting busbar 5 are located. Then, it is transferred to the liquid cooling plate 2 through the thermal conductive adhesive 3 and the thermal conductive pad 7 in sequence. The heat is carried away by the circulation of the coolant in the liquid cooling plate 2 through heat exchange, thereby realizing the heat dissipation and cooling of the cell module 1 and the integrated busbar.

[0083] Based on the above technical solutions, this application also provides a power battery, for reference. Figure 6 As shown, the power battery includes a cell module 1 and the aforementioned battery thermal management system. An integrated busbar is located at one end of the cell module 1 where the terminal post is located, and a liquid cooling plate 2 is located on the side of the integrated busbar away from the cell module 1.

[0084] Based on the above embodiments of this application, the power battery provided by this application includes the above-mentioned battery thermal management system, and therefore also has the above-mentioned beneficial effects. To avoid repetition, it will not be described again here.

[0085] Furthermore, it should be noted that the power battery provided in this application is not limited to the above structure. In actual use, it may also include multiple components such as side plates and housings. The specific components can be selected according to factors such as actual operating conditions. This application does not impose any specific restrictions on this.

[0086] The preferred embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this application, various simple modifications can be made to the technical solution of this application, and these simple modifications all fall within the protection scope of this application.

[0087] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this application will not describe the various possible combinations separately.

[0088] Furthermore, various different implementations of this application can be combined in any way, as long as they do not violate the spirit of this application, they should also be regarded as the content disclosed in this application.

Claims

1. An integrated busbar arranged between a battery cell module and a liquid cooling plate, the integrated busbar being filled with a thermally conductive adhesive between the integrated busbar and the liquid cooling plate, characterized in that, The integrated busbar includes: A blister tray includes a tray body, on which a first groove and a second groove are provided. The first groove is provided in multiple ways, and the arrangement direction of the first groove is parallel to the extension direction of the second groove. Multiple current-conducting busbars are arranged in the first groove, and the current-conducting busbars are respectively connected to the terminals of two adjacent battery cells to conduct electricity between the two adjacent battery cells. A flexible circuit board is disposed in the second groove and connected to the current-guiding busbar; The thermally conductive adhesive fills the first groove and covers the flow guide busbar.

2. The integrated busbar of claim 1, wherein, The blister tray includes at least two sets of the first grooves and at least one set of the second grooves, with each set of the second grooves disposed between the two sets of the first grooves; Each group of first grooves includes a plurality of first grooves arranged in sequence, and each group of second grooves includes at least one second groove parallel to the arrangement direction of the first grooves.

3. The integrated busbar of claim 1, wherein, A connecting groove is provided on the side wall of the first groove, and the connecting groove connects the first groove and the second groove; A data acquisition piece is connected to the flexible circuit board. The data acquisition piece is attached to the current guide busbar and connected to the flexible circuit board through the connecting groove. The data acquisition chip is attached to the side of the current-conducting busbar facing the battery cell module.

4. The integrated busbar of claim 1, wherein, The distance between the edge of the guide busbar and the sidewall of the first groove is L, where L≤3mm.

5. The integrated busbar of claim 1, wherein, The thickness of the thermally conductive adhesive is less than or equal to 8 mm.

6. The integrated busbar according to claim 1, characterized in that, A protrusion is provided on the sidewall of the first groove, and the protrusion is formed on the sidewall of the first groove in a horizontal direction.

7. The integrated busbar of claim 1, wherein, The second groove is provided with a clearance hole, the position of which corresponds to the position of the cell explosion-proof valve; The first groove is provided with a terminal hole, and the terminal of the battery cell passes through the terminal hole and is connected to the current-conducting busbar.

8. A battery thermal management system, characterized by, The battery thermal management system includes: Liquid cooling plate; and, The integrated busbar as described in any one of claims 1-7 is disposed between the liquid cooling plate and the cell module, and the first groove is filled with thermally conductive adhesive to transfer heat between the cell module and the liquid cooling plate.

9. The battery thermal management system of claim 8, wherein, The battery thermal management system further includes multiple thermal pads, which are attached and fixed to the side of the liquid cooling plate facing the integrated busbar, and the multiple thermal pads are correspondingly arranged with the multiple first grooves; The lower surface of the thermal pad abuts against the upper surface of the thermal adhesive, and the sidewall of the thermal pad abuts against the sidewall of the first groove and the boss.

10. A power cell, characterized by The power battery includes: Battery cell modules; and, The battery thermal management system as described in claim 8 or 9, wherein the integrated busbar is disposed at one end of the cell module terminal, and the liquid cooling plate is disposed on the side of the integrated busbar away from the cell module.

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