Busbar structure and battery pack

Abstract

The utility model relates to the technical field of batteries, and provides a busbar structure and a battery pack. The busbar structure comprises a busbar support, a busbar assembly and a BMS slave plate, wherein the busbar assembly and the BMS slave plate are arranged on the busbar support. The BMS slave plate is located on the side, away from the busbar support, of the busbar assembly, a heat insulation part is arranged on the side, facing the busbar assembly, of the BMS slave plate, the heat insulation part is used for preventing heat emitted by the busbar assembly from being transmitted to the BMS slave plate, and a distance s is formed between the heat insulation part and the busbar assembly. According to the busbar structure, the compactness and the energy density of the battery pack can be improved, meanwhile, the temperature rise of the busbar assembly can be avoided, the electric device failure or premature failure caused by the over-high temperature of a BMS slave plate can be avoided, the safety performance of the battery pack can be improved, the service life of the battery pack can be prolonged, the scrapping risk of the battery pack can be reduced, and the service life of the battery pack can be prolonged. Therefore, the product quality of the battery pack can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of battery, especially a busbar structure. BACKGROUND

[0002] At present, lithium ion batteries have been recognized by the new energy market due to the advantages of high energy density, small internal resistance, high safety and the like, especially in the increasing proportion of new energy vehicles as power sources year by year. With the rapid development of power battery technology, the cost factor is paid more and more attention in the design process of the battery pack, and the integration of parts can greatly reduce the cost. However, the existing battery pack still has the problem of low integration degree, and at the same time, the existing battery pack also has the problem that the busbar temperature rise has a great influence on the BMS slave plate during large rate fast charging, which leads to the aging and failure of the BMS slave plate, and is not conducive to the improvement of the energy density, safety performance and service life of the battery pack. SUMMARY

[0003] Therefore, the utility model aims at providing a busbar structure which is conducive to improving the energy density of the battery pack, and also conducive to improving the safety performance and service life of the battery pack.

[0004] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0005] A busbar structure, comprising a busbar support, a busbar assembly and a BMS slave plate provided on the busbar support;

[0006] The BMS slave plate is located on the side of the busbar assembly away from the busbar support, and the side of the BMS slave plate facing the busbar assembly is provided with a heat insulation part, the heat insulation part is used for blocking the heat emitted by the busbar assembly from being transmitted to the BMS slave plate, and a spacing s is formed between the heat insulation part and the busbar assembly.

[0007] Further, a limiting piece is provided on the busbar support, one end of the limiting piece away from the busbar support abuts against the BMS slave plate, so that the spacing s is formed between the heat insulation part and the busbar assembly.

[0008] Further, a clamping groove is provided on the BMS slave plate, a buckle is provided on the busbar support, the buckle is clamped into the clamping groove to constitute the connection between the BMS slave plate and the busbar support, or the BMS slave plate is connected with the busbar support through a rivet.

[0009] Further, the heat insulation part is in the form of a plate.

[0010] Further, the heat insulation part is made of aerogel, hard polyurethane plate or foam.

[0011] Further, in the length direction of the busbar support, the length L1 of the heat insulation part and the length L2 of the BMS slave plate satisfy: 0.5L2

[0012] Further, the interval s is between 1-8mm.

[0013] Further, the side of the heat insulation part facing the busbar assembly is provided with an insulation part, or an insulation part is arranged between the heat insulation part and the BMS slave plate.

[0014] Further, the insulation part adopts an epoxy plate or a mica plate.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] The busbar structure integrates the BMS slave plate on the busbar support, improves the compactness of the battery pack, improves the energy density of the battery pack, sets the heat insulation part, avoids the temperature rise of the busbar assembly, avoids the high temperature of the BMS slave plate causing the failure or premature failure of the electrical device, and improves the safety performance and service life of the battery pack, reduces the risk of scrapping the battery pack, and improves the quality of the battery pack product.

[0017] In addition, the limiting piece is arranged, the interval s between the heat insulation part and the busbar assembly is kept, and the heat dissipation efficiency of the busbar assembly is avoided. The heat insulation part is realized by the cooperation of the buckle and the groove, the connecting structure is simple, the connection reliability is high, and the heat insulation part is convenient to disassemble and assemble. The BMS slave plate is connected with the busbar support through the rivet, the installation operation is simple and labor-saving. The heat insulation part is plate-shaped, which is convenient for covering the BMS slave plate and effectively isolating the influence of the temperature rise of the busbar assembly on the BMS slave plate.

[0018] In addition, the heat insulation part is made of aerogel, hard polyurethane plate or foam, which has good heat insulation performance and is conducive to cost reduction. In the length direction of the busbar support, the length L1 of the heat insulation part and the length L2 of the BMS slave plate satisfy: 0.5L2

[0019] In addition, by making the interval s between 1-8mm, the situation that the surface of the busbar assembly is covered by the heat insulation part when the interval s is less than 1mm can be avoided, which affects the heat dissipation efficiency of the busbar assembly, thereby avoiding the problem that the heat accumulation of the busbar assembly is transmitted to the battery cell, which may cause the temperature of the battery cell to rise, and the use time of the battery is reduced and the thermal hazard is increased in the long run, and at the same time, when the interval s is greater than 8mm, the problem that the space in the battery pack is wasted, which is not conducive to achieving the volume energy density target of the battery pack, and brings challenges to the fixing mode of the BMS slave board and other problems.

[0020] Secondly, the side of the heat insulation part facing the busbar assembly is provided with an insulation part, or an insulation part is provided between the heat insulation part and the BMS slave board, which can effectively protect the BMS slave board, so that the BMS slave board can continue to collect the battery cell signal for as long as possible even after thermal runaway of a certain battery cell, which is convenient for subsequent fault tracing analysis, thereby facilitating the development and design of the battery pack. The insulation part is made of epoxy plate or mica plate, which not only has good insulation performance, but also has better impact resistance and deformation resistance, and is conducive to cost reduction.

[0021] Another purpose of the utility model is to provide a battery pack comprising the busbar structure as described above.

[0022] The battery pack described in the utility model comprises the busbar structure described above, and has the same beneficial effects as the prior art, which will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings that form a part of the utility model are used to provide a further understanding of the utility model, and the illustrative embodiments of the utility model and the description thereof are used to explain the utility model and do not constitute an improper limitation on the utility model. In the drawings:

[0024] Figure 1 The busbar structure described in the utility model embodiments and the structure schematic view when assembled with the battery cell;

[0025] Figure 2 The structure schematic view of the busbar structure described in the utility model embodiments;

[0026] Figure 3 The structure schematic view of the busbar support described in the utility model embodiments;

[0027] Figure 4 The Figure 3 The enlarged view of A in the middle;

[0028] Figure 5 The structure schematic view of the heat insulation part described in the utility model embodiments when assembled;

[0029] Figure 6 The structure schematic view of the heat insulation part, the structural adhesive and the BMS slave plate when assembling is shown in the embodiment of the utility model;

[0030] Figure 7 The structure schematic view of the heat insulation part, the structural adhesive and the BMS slave plate when assembling is shown in the embodiment of the utility model;

[0031] Explanation of reference signs:

[0032] 1, busbar support; 11, limiting piece; 12, buckle; 13, rivet;

[0033] 2, busbar assembly; 3, BMS slave plate; 4, heat insulation part; 5, acquisition plate; 6, battery cell group; 7, structural adhesive. Specific implementation

[0034] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0035] In the following description, specific details are set forth such as specific system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application for purposes of explanation and not limitation. However, it should be apparent to those skilled in the art that the present application can be realized in other embodiments without these specific details.

[0036] In the description of the utility model, it should be explained that if the terms indicating orientation or position relationship such as "upper", "lower", "inner", "outer" appear, it is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation on the utility model. In addition, if the terms "first", "second" appear, they are also used for description purposes only and cannot be understood as indicating or implying relative importance.

[0037] In addition, in the description of the utility model, unless otherwise explicitly limited, the terms "mounting", "connection", "connection", "connecting piece" should be understood broadly. For example, it can be fixedly connected, or it can be detachably connected, or integrally connected; It can be mechanically connected, or it can be electrically connected; It can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood in combination with specific circumstances.

[0038] The utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0039] Embodiment One

[0040] The present embodiment relates to a busbar structure which is conducive to solving the problem of low integration degree of existing battery packs and the problem of large thermal influence of busbar temperature rise on BMS slave boards 3 during large-rate fast charging, thereby improving the overall performance of the battery pack.

[0041] As shown in the overall structure, Figures 1 to 7 the busbar structure of the present embodiment includes a busbar support 1, a busbar assembly 2 and a BMS slave board 3 arranged on the busbar support 1. Moreover, the BMS slave board 3 is located on the side of the busbar assembly 2 away from the busbar support 1, and the side of the BMS slave board 3 facing the busbar assembly 2 is provided with a heat insulation part 4 for blocking the heat emitted by the busbar assembly 2 from being transmitted to the BMS slave board 3, and a spacing s is formed between the heat insulation part 4 and the busbar assembly 2.

[0042] At this time, as arranged above, by integrating the BMS slave board 3 on the busbar support 1, the compactness of the battery pack can be improved to increase the energy density of the battery pack. At the same time, by arranging the heat insulation part 4, the temperature rise of the busbar assembly 2 can be avoided, thereby avoiding the failure or premature failure of electrical devices caused by the excessive temperature of the BMS slave board 3, so as to improve the safety performance and service life of the battery pack and reduce the risk of scrapping the battery pack, thereby improving the quality of the battery pack product.

[0043] Based on the above content, in detail, in the present embodiment, in the specific implementation, the busbar support 1 is preferably made of injection molding process, and high-strength engineering plastic is preferably used to ensure the fixation of the BMS slave board 3 and the busbar. Figure 1 and Figure 2 As shown, the busbar support 1 is also provided with a collection plate 5 connected with the busbar assembly 2. The collection plate 5 can be a flexible collection plate well known to those skilled in the art, and the related structure parts not mentioned in the busbar structure of the present embodiment can all refer to the structures in the existing battery pack, which will not be described here.

[0044] Moreover, it is worth mentioning that by integrating the BMS slave board 3 for collecting the voltage and temperature signals of the battery cells with the busbar support 1, the integration degree of the battery management system BMS in the battery pack can be improved, the number of low-voltage wiring harnesses can be reduced, the cost can be reduced, and the space of the electrical cabin can also be reduced. However, this integration method cannot ignore the thermal influence of the temperature rise of the busbar assembly 2 on the BMS slave board 3 during large-rate fast charging, so a new busbar structure is needed to solve this problem. The busbar structure of the present embodiment mainly solves the problem of the thermal influence of the temperature rise of the busbar assembly 2 on the BMS slave board 3 during large-rate fast charging through the design of the heat insulation part 4, so that the battery pack has better use reliability.

[0045] It should be noted that the direction-related descriptions in this embodiment are merely illustrative examples. In actual implementation, the direction descriptions in this embodiment vary depending on the orientation of the busbar structure (or busbar support 1). That is, the directions in this embodiment refer to a relative coordinate system based on the busbar structure (or busbar support 1).

[0046] In this embodiment, as a preferred implementation, see [reference needed]. Figure 3 and Figure 4 As shown, a limiting member 11 is provided on the busbar bracket 1. The end of the limiting member 11 away from the busbar bracket 1 abuts against the BMS slave plate 3, so that a gap s is formed between the heat insulation part 4 and the busbar assembly 2. By setting the limiting member 11, the gap s between the heat insulation part 4 and the busbar assembly 2 can be maintained, thus avoiding affecting the heat dissipation efficiency of the busbar assembly 2.

[0047] Furthermore, in this embodiment, as a preferred implementation, the BMS has a slot on board 3, and see [reference needed]. Figure 2 and Figure 4 As shown, the busbar bracket 1 is provided with a buckle 12, which is snapped into the slot to form a connection between the BMS slave board 3 and the busbar bracket 1. In this way, a snap-fit ​​connection can be formed, which makes the connection structure simple, the connection reliable, and easy to disassemble and assemble.

[0048] Of course, the number and arrangement of the buckles 12 in this embodiment can be set and adjusted according to the connection requirements between the busbar bracket 1 and the BMS slave plate 3. For example, if multiple buckles 12 are arranged at intervals along the circumference of the BMS slave plate 3, then the slots only need to be set to correspond to the buckles 12.

[0049] Furthermore, in this embodiment, besides the snap-fit ​​connection, other connection methods can also be used between the BMS slave board 3 and the busbar bracket 1. For example, as a preferred embodiment, the BMS slave board 3 is connected to the busbar bracket 1 via rivets 13. It is understood that connecting the BMS slave board 3 to the busbar bracket 1 via rivets 13 simplifies and reduces the effort required for installation.

[0050] Furthermore, in this embodiment, as a preferred implementation, the heat insulation part 4 is plate-shaped, which facilitates the covering of the BMS slave plate 3, effectively isolating the influence of the temperature rise of the busbar assembly 2 on the BMS slave plate 3, thereby reducing the aging and failure rate of the BMS slave plate 3 and extending the service life of the BMS slave plate 3.

[0051] In specific implementation, such as Figure 7As shown, the heat insulation part 4 of the embodiment is adhered to the BMS slave plate 3 by the structural adhesive 7, which can first protect the array pins of the electrical devices on the BMS slave plate 3 and secondly increase the insulation capability of the busbar assembly 2 and the BMS slave plate 3. The structural adhesive 7 can be a heat-conductive structural adhesive 7 known to those skilled in the art.

[0052] Further, in the embodiment, as a preferred implementation form, the heat insulation part 4 is made of aerogel, rigid polyurethane plate or foam, so as to have better heat insulation performance and facilitate cost reduction. It is worth mentioning here that the aerogel has good heat insulation effect and can meet the flame retardant requirement of V0 level. The rigid polyurethane plate has low thermal conductivity, simple process and low cost.

[0053] Meanwhile, the foam has good compressibility, can absorb assembly tolerance, has mature process and low cost. Of course, the heat insulation part 4 can also be made of other materials having low thermal conductivity, small thermal resistance and good insulation, which will not be described here.

[0054] In the embodiment, as a preferred implementation form, in the length direction of the busbar support 1, the length L1 of the heat insulation part 4 and the length L2 of the BMS slave plate 3 satisfy: 0.5L2

[0055] The advantage of such arrangement mainly lies in that the heat insulation part 4 can avoid being too small to well insulate heat, still having the risk of failure of the electrical devices of the BMS slave plate 3, and avoid being too large to cause space waste, affect the structural design and arrangement of the surrounding parts and have part of the heat insulation part 4 wasted.

[0056] In the embodiment, the length L1 of the heat insulation part 4 and the length L2 of the BMS slave plate 3 can specifically satisfy: L1=0.5L2, 0.8L2, L2 or 1.1L2, and the width W1 of the heat insulation part 4 and the width W2 of the BMS slave plate 3 can specifically satisfy: W1=0.5W2, 0.8W2, W2 or 1.1W2, so as to achieve better heat insulation effect.

[0057] In the embodiment, as a preferred implementation form, still referring to Figure 7As shown, the interval s is between 1-8mm, and for example, the interval s can be 1mm, 3mm, 5mm or 8mm, etc. In this way, it can be avoided that the interval s < 1mm causes the surface of the busbar assembly 2 to be covered by the heat insulation part 4, affecting the heat dissipation efficiency of the busbar assembly 2, and further avoiding the problem that the heat accumulation of the busbar assembly 2 transmitted to the battery cell may cause the temperature of the battery cell to rise, which may reduce the service time of the battery and increase the risk of heat accumulation. At the same time, it can also avoid the problem that when the interval s is greater than 8mm, it will cause the space waste in the battery pack, which is not conducive to achieving the volume energy density target of the battery pack, and brings challenges to the fixing method of the BMS slave board 3.

[0058] In addition, in this embodiment, as a preferred implementation form, the side of the heat insulation part 4 facing the busbar assembly 2 is provided with an insulating part, or an insulating part is provided between the heat insulation part 4 and the BMS slave board 3. In this way, the BMS slave board 3 can be effectively protected, and even if thermal runaway occurs in a certain battery cell, the BMS slave board 3 can continue to collect battery cell signals for as long as possible, which is convenient for subsequent fault tracing analysis, thereby facilitating the development and design of the battery pack.

[0059] In specific implementation, in this embodiment, as a preferred implementation form, the insulating part is made of an epoxy plate or a mica plate. The epoxy plate or the mica plate can ensure good structural integrity and insulation at high temperature, so that the insulating part not only has good insulation performance, but also has better impact resistance and deformation resistance, and is conducive to cost reduction.

[0060] In specific implementation, the length and width dimensions of the insulating part of the present embodiment can be the same as or similar to those of the heat insulation part 4, so as to achieve good insulation effect, thereby prolonging the service life of the BMS slave board 3, facilitating the fault tracing analysis of the battery pack in the later stage, and improving the safety performance of the battery pack.

[0061] The busbar structure of the present embodiment can improve the compactness of the battery pack to improve the energy density of the battery pack, and also avoid the temperature rise of the busbar assembly 2, thereby avoiding the problem that the high temperature of the BMS slave board 3 may cause electrical device failure or premature failure, thereby improving the safety performance and service life of the battery pack and reducing the risk of battery pack scrapping.

[0062] Embodiment Two

[0063] The present embodiment relates to a battery pack which includes the busbar structure in Embodiment One. In specific implementation, as shown, Figure 1 the battery pack of the present embodiment also includes a battery cell group 6, and the two sides of the battery cell group 6 in the width direction are the tab sides, and the busbar structure is provided on the two groups of tab sides of the battery cell group 6.

[0064] As for the relevant structural parts not mentioned in the battery pack of the present embodiment, for example, it includes the battery box, and the electrical cabin and the battery cabin arranged in the battery box, the BMS mainboard and the electrical devices such as BDU are placed in the electrical cabin, the battery cell group 6 is placed in the battery cabin, etc., can refer to the battery pack product known to those skilled in the art, and will not be described here.

[0065] The busbar structure of the present embodiment has the same beneficial effects as the conventional technology by setting the busbar structure in embodiment one, and will not be described here.

[0066] The above only describes the preferred embodiment of the present application, and does not limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A busbar structure, characterized in that: Includes a busbar bracket, and a busbar assembly and BMS slave board mounted on the busbar bracket; The BMS slave plate is located on the side of the busbar assembly away from the busbar support. The side of the BMS slave plate facing the busbar assembly is provided with a heat insulation part, which is used to block the heat emitted by the busbar assembly from being transferred to the BMS slave plate, and a gap s is formed between the heat insulation part and the busbar assembly.

2. The busbar structure according to claim 1, characterized in that: The busbar support is provided with a limiting member, and the end of the limiting member away from the busbar support abuts against the BMS slave plate, so that the heat insulation part and the busbar assembly form the gap s.

3. The busbar structure according to claim 2, characterized in that: The BMS slave board has a slot, and the busbar bracket has a buckle. The buckle engages with the slot to form a connection between the BMS slave board and the busbar bracket; or... The BMS slave board is connected to the busbar bracket by rivets.

4. The bus structure according to claim 1, characterized in that: The heat insulation part is plate-shaped.

5. The bus structure according to claim 4, characterized in that: The insulation is made of aerogel, rigid polyurethane board or foam.

6. The bus structure according to claim 4, characterized in that: Along the length of the busbar support, the length L1 of the insulation section and the length L2 of the BMS feed plate satisfy the following: 0.5L2 < L1 < 1.1L2; and / or, In the height direction of the busbar support, the width W1 of the heat insulation part and the width W2 of the BMS slave plate satisfy the following condition: 0.5W2 < W1 < 1.1W2.

7. The bus structure according to claim 1, characterized in that: The spacing s is between 1 and 8 mm.

8. The busbar structure according to any one of claims 1 to 7, characterized in that: The heat insulation part has an insulating part on the side facing the busbar assembly, or an insulating part is provided between the heat insulation part and the BMS slave plate.

9. The bus structure according to claim 8, characterized in that: The insulation part is made of epoxy board or mica board.

10. A battery pack, characterized in that: The bus structure includes any one of claims 1 to 9.

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