Battery pack and electric vehicle

Abstract

The utility model discloses a battery pack for electric automobile, include: battery box, front drive power output interface and rear drive power output interface are respectively established on the opposite two side walls of battery box, and the battery pack supplies power to electric automobile through front drive power output interface and rear drive power output interface, the electric core group is established in the inside of battery box, including a plurality of electric core, is equipped with the explosion -proof valve on the electric core, and the explosion -proof valve is arranged along the first direction, the high pressure connects copper row, and the high pressure connects copper row is straddled and is established in the top of electric core group, and extends along the second direction, and the second direction is perpendicular to the first direction, and the front drive power output interface and rear drive power output interface electricity are connected. The above setting mode can improve the insulation protection effect of the high pressure connection copper row in the battery pack. The utility model discloses electric automobile.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery pack and an electric vehicle. Background Technology

[0002] New energy vehicles, with their flexible motor layout, widely utilize dual-motor, triple-motor, and even in-wheel motor solutions to achieve four-wheel drive functionality. Currently, the number of electric four-wheel drive models in the 100,000-200,000 yuan price range is gradually increasing. As electric four-wheel drive models become more common, the battery pack needs to have front and rear drive power output interfaces to meet power distribution requirements. In existing technologies, the front and rear drive power output interfaces are typically connected via high-voltage copper busbars.

[0003] However, the internal space of the battery pack is limited, and this space is already largely occupied by the battery cells, making it difficult to free up additional space for the arrangement of the front and rear drive high-voltage connection copper busbars. (Reference) Figure 1 The mainstream approach in the existing technology is to arrange the high-voltage connecting copper busbar 3 on the side of the cell assembly 4. One end of the high-voltage connecting copper busbar 3 is connected to the rear drive power output interface 1, and the other end is connected to the high-voltage control box 5, and then to the front drive power output interface 2. The entire high-voltage connecting copper busbar 3 is arranged along the inner sidewalls of both sides of the battery box 6. However, the cell assembly 4 occupies most of the space inside the battery box 6. This approach in the existing technology results in the cell assembly 4 having too compact a space in the battery box 6, which in turn leads to the cell assembly 4 and the high-voltage connecting copper busbar 3 being in close proximity. Figure 1 Friction occurs at point A in the battery pack, causing mutual interference. The existing technology of arranging high-voltage copper busbars from both sides of the battery pack has several drawbacks. Firstly, it reduces the effective space for cell arrangement, affecting the improvement of battery pack energy density. Secondly, in the event of a side impact, the external impact can easily crush the high-voltage copper busbars on both sides, leading to damage and the risk of sparking, threatening the safety of the vehicle and its occupants. Utility Model Content

[0004] This invention proposes a battery pack to solve the above-mentioned problems.

[0005] In a first aspect, embodiments of this utility model disclose a battery pack for electric vehicles, comprising:

[0006] Battery housing;

[0007] The front drive power output interface and the rear drive power output interface are respectively located on two opposite side walls of the battery box. The battery pack supplies power to the electric vehicle through the front drive power output interface and the rear drive power output interface.

[0008] The battery cell assembly is located inside the battery box and includes multiple battery cells. Each battery cell is equipped with an explosion-proof valve, which are arranged along the first direction.

[0009] A high-voltage connecting copper busbar is positioned above the battery cell assembly and extends along a second direction perpendicular to the first direction, electrically connecting the front drive power output interface and the rear drive power output interface.

[0010] By adopting the above technical solution, in the battery pack of this utility model, the high-voltage connecting copper busbar is placed above the cell assembly, which can greatly increase the arrangement space of the cell assembly in the length and width directions of the battery box, improve the battery assembly efficiency and energy density, and prevent collision and friction between the high-voltage connecting copper busbar and the cell assembly. The number of explosion-proof valves located below the high-voltage connecting copper busbar is also reduced, which can effectively improve the protection effect of the high-voltage connecting copper busbar.

[0011] Optionally, the high-voltage connection copper busbar includes:

[0012] Copper bus body;

[0013] Multiple protective layers are sequentially wrapped around the outside of the copper busbar body, and the materials of the multiple protective layers are different from each other.

[0014] Optionally, the protective layer consists of three layers, from the inside out: mica paper, heat-shrink film, and ceramic silicone tape.

[0015] Optionally, the mica paper has a thickness of 0.5-0.7 mm, the heat shrink film has a thickness of 0.8-1.5 mm, and the ceramic silicone tape has a thickness of 0.5-0.7 mm.

[0016] Optionally, it also includes a fireproof partition, which is disposed between the battery cell assembly and the high-voltage connecting copper busbar.

[0017] Optionally, in the first direction, the width of the fireproof partition is greater than the width of the high-voltage connecting copper busbar, and / or the thickness of the fireproof partition is 1-3 mm.

[0018] Optionally, it also includes a battery box cover that covers the opening of the battery box body. The surface of the battery box cover protrudes upward and forms a receiving space with the fireproof partition, and the high-voltage connection copper busbar is located within the receiving space.

[0019] Optionally, the bottom surface of the battery compartment cover is provided with a mica protective layer.

[0020] Optionally, the cells in the cell pack are ternary lithium batteries.

[0021] Secondly, embodiments of the present invention disclose an electric vehicle, including the battery pack described in any of the embodiments of the first aspect.

[0022] By adopting the above technical solution, in the battery pack of the electric vehicle of this utility model, the high-voltage connecting copper busbar is placed above the battery cell assembly, which can greatly increase the arrangement space of the battery cell assembly in the length and width directions of the battery box, improve the battery assembly efficiency and energy density, and there will be no collision or friction between the high-voltage connecting copper busbar and the battery cell assembly. The number of explosion-proof valves located below the high-voltage connecting copper busbar is also reduced, which can effectively improve the protection effect of the high-voltage connecting copper busbar. Attached Figure Description

[0023] Figure 1 A schematic diagram showing the arrangement of high-voltage connection copper busbars in a battery pack according to the prior art;

[0024] Figure 2 This is a structural schematic diagram showing the arrangement of the high-voltage connecting copper busbars in the battery pack according to an embodiment of the present invention;

[0025] Figure 3 This diagram shows a structural schematic of the battery box cover in an embodiment of the present invention.

[0026] Figure 4 This is a structural schematic diagram showing the positional relationship between the battery cell assembly and the high-voltage connecting copper busbar in an embodiment of the present invention;

[0027] Figure 5 This is a cross-sectional view of the internal structure of the high-voltage connecting copper busbar in an embodiment of the present invention;

[0028] Figure 6 This diagram shows the overall structure of the high-voltage connecting copper busbar in an embodiment of the present invention.

[0029] Figure 7 An exploded view of the high-voltage connecting copper busbar in an embodiment of this utility model is shown;

[0030] Figure 8 An exploded view of the battery pack in an embodiment of this utility model is shown;

[0031] Figure 9 This is a cross-sectional schematic diagram of a partial structure of the battery pack in an embodiment of the present invention.

[0032] Figure label:

[0033] 1. Rear drive power output interface; 2. Front drive power output interface; 3. High voltage connecting copper busbar; 31. Ceramic silicone tape; 32. Heat shrink film; 33. Mica paper; 34. Copper busbar body; 4. Battery cell assembly; 5. High voltage control box; 6. Battery box body; 7. Battery box cover; 71. Box cover bulge; 8. Battery cell; 9. Explosion-proof valve; 10. Fireproof partition; 10. First direction X; Second direction Y; Height direction H; Length direction L; Width direction W. Detailed Implementation

[0034] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0035] It should be noted that in this specification, similar reference numerals 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.

[0036] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0037] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" 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 mechanical connection or an electrical 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 embodiment based on the specific circumstances.

[0038] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0039] refer to Figure 2 This utility model discloses a battery pack for electric vehicles, comprising a battery housing 6, a front-drive power output interface 2, a rear-drive power output interface 1, a battery cell assembly, and a high-voltage connecting copper busbar 3. The front-drive power output interface 2 and the rear-drive power output interface 1 are respectively located on two opposite side walls of the battery housing 6, and the battery pack supplies power to the electric vehicle through these interfaces. Specifically, one end of the high-voltage connecting copper busbar 3 is connected to the rear-drive power output interface 1, and the other end is connected to the high-voltage control box 5, and then to the front-drive power output interface 2.

[0040] refer to Figure 4 and Figure 8 The battery cell assembly is located inside the battery housing 6 and includes multiple battery cells 8. Each battery cell 8 is equipped with an explosion-proof valve 9. The explosion-proof valve 9 extends along a first direction (i.e., Figure 8 The first direction (X) is arranged. Three high-voltage connecting copper busbars are positioned above the battery cell assembly (i.e., in...). Figure 8 In the height direction H of the battery pack shown, the high-voltage connecting copper busbar 3 is located above the cell assembly, along the second direction (i.e. Figure 8 The second direction (Y) extends from the first direction, and the second direction is perpendicular to the first direction, electrically connecting the front drive power output interface 2 and the rear drive power output interface 1.

[0041] Among them, the high-voltage connecting copper busbar 3 is a rigid conductive connector used in fields such as new energy vehicles, energy storage systems, and industrial high-voltage equipment to realize the transmission and distribution of high-voltage electrical energy. Its core is made of high-purity copper material through rolling, extrusion, or forging. The core function of the high-voltage connecting copper busbar 3 is to build a low-impedance conductive path in the high-voltage system. In this embodiment, the high-voltage connecting copper busbar 3 is specifically located in the battery pack of a new energy electric vehicle, connecting the battery cell group with the front and rear drive power output interfaces, and the battery distribution unit (BDU) with high-voltage components (such as inverters and fast charging interfaces) to achieve stable transmission of high-voltage electrical energy of hundreds or even thousands of volts.

[0042] Using the above technical solution, in the battery pack of this utility model, the high-voltage connecting copper busbar 3 is positioned above the cell assembly. The entire high-voltage connecting copper busbar 3 is arranged along the middle of the battery box 6 and crosses the cell assembly (i.e., cell assembly 4) in the height direction. With this arrangement, only the height direction (i.e., in the...) is required. Figure 8 Space is reserved for copper busbar arrangement in the height direction (H) of the battery pack shown, so that copper busbars can be arranged in the length direction (i.e., the length direction of the battery housing 6). Figure 2 In the length direction (L) and the width direction (i.e. Figure 2 The width direction (W) of the battery pack greatly increases the arrangement space of the battery cells, which helps to improve the battery pack efficiency and energy density, and there will be no collision or friction between the high voltage connection copper busbar 3 and the battery cells.

[0043] However, reference Figure 4Simply placing the high-voltage connecting copper busbar 3 above the battery cell assembly still presents key safety hazards: First, the volume of the high-voltage connecting copper busbar 3 itself will occupy the exhaust space of the explosion-proof valve 9 (the explosion-proof valve 9 is a directional pressure relief valve when the battery cell 8 experiences thermal runaway; that is, when the battery cell 8 experiences thermal runaway, a large amount of high-temperature and high-pressure gas will be ejected from the explosion-proof valve 9) in the event of thermal runaway, resulting in poor exhaust of the explosion-proof valve 9. The ejected material generated by thermal runaway will accumulate inside the package, thereby increasing the risk of thermal runaway fire. Second, when the battery cell experiences thermal runaway, the high-pressure and high-temperature gas ejected from the explosion-proof valve 9 carries an electric charge, which can easily burn the insulating protective layer on the surface of the high-voltage connecting copper busbar 3, causing high-voltage arcing between adjacent high-voltage connecting copper busbars 3 and triggering a secondary safety accident.

[0044] Therefore, in the above embodiment, an explosion-proof valve 9 is also provided along the first direction (i.e., Figure 8 The high-voltage connecting copper busbars 3 are arranged along the first direction (X), and the high-voltage connecting copper busbars 3 are arranged along the second direction (i.e., Figure 8 The second direction (Y) extends in the middle, so the number of explosion-proof valves 9 located below the high-voltage connection copper busbar 3 is reduced, which can reduce the impact of the explosion-proof valves 9 on the high-voltage connection copper busbar 3, reduce the damage to the high-voltage connection copper busbar 3, and effectively improve the protection effect of the high-voltage connection copper busbar 3.

[0045] Furthermore, in the above embodiments, the battery cell 8 in the battery cell group is a ternary battery cell.

[0046] Furthermore, in the above embodiments, reference is made to... Figure 5 , Figure 6 and Figure 7 The high-voltage connecting copper busbar 3 includes a copper busbar body 34 and multiple protective layers. These multiple protective layers sequentially cover the exterior of the copper busbar body 34, and each protective layer is made of a different material. Specifically, the first protective layer directly covers the exterior of the copper busbar body 34, the second protective layer covers the exterior of the first protective layer, the third protective layer covers the exterior of the second protective layer, and so on, ultimately achieving a multi-layered protective structure covering the exterior of the copper busbar body 34. By setting multiple protective layers of different materials on the exterior of the copper busbar body 34, the protection effect on the copper busbar body 34 can be effectively improved.

[0047] Furthermore, in the above embodiments, reference continues to be made to... Figure 5 , Figure 6 and Figure 7 The protective layer consists of three layers, from the inside out: mica paper 33, heat shrink film 32, and ceramic silicone tape 31.

[0048] In existing technologies, conventional heat-shrink film insulation protection for high-voltage connecting copper busbars 3 can only withstand high-temperature impacts of around 200°C. However, in the face of thermal runaway of ternary lithium-ion batteries, the temperature at the point of eruption can reach approximately 800°C. Clearly, traditional copper busbar protection solutions are insufficient to meet insulation protection requirements in this scenario. Furthermore, there is a potential difference of approximately 300-400 volts between the high-voltage connecting copper busbars 3 of the front-drive power output interface 2 and the rear-drive power output interface 1. Additionally, when the ternary lithium-ion battery experiences thermal runaway and valve opening, the high-temperature, high-voltage conductive material ejected from the explosion-proof valve 9 will also impact the high-voltage connecting copper busbar 3, resulting in thermoelectric mixing and cross-contamination in this area, making effective insulation protection difficult.

[0049] In the above embodiments, a triple protection scheme is adopted. The innermost layer is protected by mica paper 33, which has good temperature resistance and still meets the relevant insulation and withstand voltage protection requirements at high temperatures. However, due to its inherent disadvantages such as poor wear resistance, fragility, and delamination, heat-shrink film 32 is applied to the outside of the mica paper 33 to prevent excessive wear. Finally, a ceramic silicone tape 31 is wrapped around the outermost layer. This material also has good high-temperature impact resistance and can be used to resist the first wave of thermal shock after the explosion-proof valve 9 of the battery cell 8 is opened. With this configuration, the high-voltage connecting copper busbar 3 can cope with the high-temperature and high-pressure gas ejected during thermal runaway of the ternary battery cell.

[0050] Furthermore, in the above embodiments, the mica paper 33 has a thickness of 0.5-0.7 mm, the heat-shrink film 32 has a thickness of 0.8-1.5 mm, and the ceramic silicone tape 31 has a thickness of 0.5-0.7 mm. This arrangement can further improve the protective effect. In a more specific embodiment, the mica paper 33 may have a thickness of 0.6 mm, the heat-shrink film 32 may have a thickness of 1 mm, and the ceramic silicone tape 31 may have a thickness of 0.6 mm.

[0051] Furthermore, in the above embodiments, reference is made to... Figure 8 and combined Figure 9 The battery pack also includes a fireproof partition 10, which is located between the battery cell assembly and the high-voltage connecting copper busbar 3.

[0052] In addition to the inherent protective measures of the high-voltage connecting copper busbar 3, a fireproof partition 10 is added to the entire battery pack. The fireproof partition 10 is placed between the explosion-proof valve 9 and the high-voltage connecting copper busbar 3, thereby achieving thermal and electrical separation protection of the high-voltage connecting copper busbar. This is achieved by placing the fireproof partition 10 and the bulge portion 71 of the battery box cover 7 (see reference...) Figure 3 The combination of the two forms a unique isolation chamber, which can effectively protect the high-voltage connecting copper busbar 3. Furthermore, the entire isolation chamber is relatively sealed, which can effectively isolate the high-temperature and high-pressure gas ejected from the explosion-proof valve 9, greatly reducing the risk of arcing of the copper busbar.

[0053] Furthermore, in the above embodiments, reference is made to... Figure 8 and combined Figure 9 In the first direction (i.e. Figure 8 In the first direction (X) shown, the width of the fireproof partition 10 is greater than the width of the high-voltage connecting copper busbar 3, and / or the thickness of the fireproof partition 10 is 1-3 mm.

[0054] With this configuration, the fireproof partition 10 protects against thermal shock with its entire surface, effectively dispersing the impact intensity. Furthermore, the large surface allows for rapid venting, effectively preventing the accumulation of ejected material. In a more specific embodiment, the thickness of the fireproof partition 10 can be 2 millimeters.

[0055] Furthermore, in the above embodiments, reference is made to... Figure 3 , Figure 8 and Figure 9 The battery pack also includes a battery cover 7, which covers the opening of the battery box body 6. The surface of the battery cover 7 protrudes upward and forms a receiving space with the fireproof partition 10, within which the high-voltage connecting copper busbar 3 is located. The upward protrusion of the battery cover 7 forms a cover bulge 71. Furthermore, the middle portion of the battery cover 7 can be partially bulged, with the entire bulge occupying only a small portion of the battery cover 7, and corresponding to the central passage of the vehicle body, thus avoiding obstruction of the high-voltage connecting copper busbar 3.

[0056] Furthermore, in the above embodiments, the bottom surface of the battery box cover 7 is provided with a mica protective layer. This arrangement can further protect the battery box cover 7 and reduce the damage to the battery box cover 7 caused by the hot air jets emitted from the explosion-proof valve 9 in other areas.

[0057] In the above embodiments, the battery pack of this utility model can make full and effective use of the internal layout space of the battery pack. Under the original tight space, the shape of the battery box cover 7 and the routing direction of the high-voltage connecting copper busbar 3 are optimized. On the one hand, it avoids the chassis of the vehicle body, makes reasonable use of the limited chassis space and meets the safety distance. On the other hand, it can also optimize and save the space for copper busbar arrangement, so as to arrange the high-voltage connecting copper busbar 3 connecting the front and rear drive power output interfaces (i.e., the front drive power output interface 2 and the rear drive power output interface 1), which greatly improves the space utilization rate.

[0058] Meanwhile, a new and flexible copper busbar protection measure is set up for the high-voltage connection copper busbar 3. The copper busbar is protected by triple protection measures for high temperature, insulation and withstand voltage. It can effectively protect against the high temperature and high pressure charged gas ejected when the ternary battery cell is thermally runaway. In the thermal runaway test of the ternary battery cell, it can withstand the insulation protection requirements of 800℃ high temperature and high pressure flame impact.

[0059] In addition, thermal and electrical separation protection measures are set for the battery cell assembly and the high-voltage connecting copper busbar 3 located above it. The fireproof partition 10 and the bulging shape of the battery box cover 7 form an isolation chamber to protect against high temperature, reduce the high temperature impact on the copper busbar area, effectively reduce the influence of hot air flow on the copper busbar, realize local thermal and electrical separation of the copper busbar, greatly reduce the risk of copper busbar arcing, effectively realize the thermal and electrical separation of battery cell ejection material and copper busbar conductor, and further improve the safety of use.

[0060] Secondly, embodiments of the present invention disclose an electric vehicle, including the battery pack described in any of the embodiments of the first aspect.

[0061] By adopting the above technical solution, in the battery pack of the electric vehicle of this utility model, the high-voltage connecting copper busbar is placed above the battery cell assembly, which can greatly increase the arrangement space of the battery cell assembly in the length and width directions of the battery box, improve the battery assembly efficiency and energy density, and there will be no collision or friction between the high-voltage connecting copper busbar and the battery cell assembly. The number of explosion-proof valves located below the high-voltage connecting copper busbar is also reduced, which can effectively improve the protection effect of the high-voltage connecting copper busbar.

[0062] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A battery pack for use in an electric vehicle, characterized in that, include: Battery housing; The front drive power output interface and the rear drive power output interface are respectively located on two opposite side walls of the battery box. The battery pack supplies power to the electric vehicle through the front drive power output interface and the rear drive power output interface. A battery cell assembly, located inside the battery housing, includes multiple battery cells, each battery cell being equipped with an explosion-proof valve, the explosion-proof valves being arranged along a first direction; A high-voltage connecting copper busbar is positioned above the battery cell assembly and extends along a second direction perpendicular to the first direction, electrically connecting the front drive power output interface and the rear drive power output interface.

2. The battery pack as described in claim 1, characterized in that, The high-voltage connection copper busbar includes: Copper bus body; Multiple protective layers are sequentially wrapped around the outside of the copper busbar body, and the materials of the multiple protective layers are different from each other.

3. The battery pack as described in claim 2, characterized in that, The protective layer consists of three layers, from the inside out: mica paper, heat-shrink film, and ceramic silicone tape.

4. The battery pack as described in claim 3, characterized in that, The mica paper has a thickness of 0.5-0.7 mm, the heat shrink film has a thickness of 0.8-1.5 mm, and the ceramic silicone tape has a thickness of 0.5-0.7 mm.

5. The battery pack as described in claim 1, characterized in that, It also includes a fireproof partition, which is disposed between the battery cell assembly and the high-voltage connecting copper busbar.

6. The battery pack as described in claim 5, characterized in that, In the first direction, the width of the fireproof partition is greater than the width of the high-voltage connecting copper busbar, and / or the thickness of the fireproof partition is 1-3 mm.

7. The battery pack as described in claim 5, characterized in that, It also includes a battery box cover, which covers the opening of the battery box body. The surface of the battery box cover protrudes upward and forms a receiving space with the fireproof partition, and the high-voltage connecting copper busbar is located in the receiving space.

8. The battery pack as described in claim 7, characterized in that, The bottom surface of the battery box cover is provided with a mica protective layer.

9. The battery pack as claimed in claim 1, characterized in that, The battery cells in the battery pack are ternary lithium batteries.

10. An electric vehicle, characterized in that, Includes the battery pack as described in any one of claims 1-9.

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