Battery device and vehicle

Abstract

A battery device comprising a battery pack and a housing, wherein the housing comprises a base plate, the battery pack is arranged inside the housing, and the battery pack comprises: a plurality of cylindrical battery cells, wherein an axial direction of each cylindrical battery cell is parallel to the bottom plate and each cylindrical battery cell has a terminal; a conductive busbar connecting two adjacent cylindrical battery cells; and an insulating cover plate arranged on a side of the cylindrical battery cells where the terminals are located, wherein a wall portion of the insulating cover plate facing the conductive busbar has a through-hole, and the through-hole and the conductive busbar are at least partially offset.

Description

Technical area

[0001] The present application relates to the field of rechargeable battery technology, in particular a battery device and a vehicle. State of the art

[0002] During storage or under extreme operating conditions, such as high- or low-temperature conditions, the temperatures inside a battery device may not match the external environment, which could lead to the formation of condensation inside the battery device. If this condensation drips onto terminals or conductive busbars, it could pose a short circuit risk. SUMMARY OF THE INVENTION

[0003] The aim of the present application is to provide a battery device and a vehicle that reduce the risk of short circuit and improve safety performance.

[0004] To achieve the above technical problem, the present application provides a battery device comprising a housing and a battery pack, wherein the housing comprises a bottom plate, the battery pack is arranged inside the housing, and the battery pack comprises: a plurality of cylindrical battery cells, wherein an axial direction of each cylindrical battery cell is parallel to the bottom plate and each cylindrical battery cell has a terminal; a conductive busbar connecting two adjacent cylindrical battery cells; and an insulating cover plate arranged on a side of the cylindrical battery cells where the terminals are located, wherein a wall portion of the insulating cover plate facing the conductive busbar has a through-hole, and the through-hole and the conductive busbar are at least partially offset.

[0005] In the battery device of the present application, the insulating cover plate is arranged on the side of the cylindrical battery cells where the terminals are located, covering at least the terminals and the conductive busbar to prevent condensation inside the battery device from directly falling onto the terminals or the conductive busbar and causing a short circuit risk. The wall portion of the insulating cover plate facing the conductive busbar has a through-hole that provides a direct heat dissipation channel for the side of the cylindrical battery cells where the terminals are located.The heat generated during charging and discharging of a plurality of cylindrical battery cells can quickly escape through the through-hole, reducing local temperature rises at the junction between the terminals and the conductive busbar, preventing performance degradation or accelerated aging due to heat buildup, and preventing condensation due to temperature differences between the surface of the battery pack and other locations within the battery device, further reducing the risk of short circuits. The through-hole and the conductive busbar are at least partially offset to minimize insulation failure of the conductive busbar.

[0006] The present application also provides a vehicle including the above-mentioned battery device.

[0007] The vehicle of the present application comprises the above-mentioned battery device and thereby provides the same technical effects as the above-mentioned battery device, which will not be discussed again here. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a structural diagram of a particular embodiment of a battery device provided by the present application; Fig. 2 is a structural diagram of a battery pack made of Fig. 1; Fig. 3 is an exploded view of a battery pack from Fig. 2; Fig. 4 is a structural representation of an insulating cover plate made of Fig. 2; Fig. 5 is a structural diagram of an insulating cover plate made of Fig. 4 from a different viewing angle;

[0008] The reference symbols in the Fig. 1 to 5 are as follows: 1-battery pack; 11-cylindrical battery cell; 12-conductive busbar; 13-insulating cover plate; 131-wall section; 132-adhesive layer; a-through hole; 2-casing. DETAILED DESCRIPTION

[0009] In the following, the technical solutions in the embodiments of the present application are described clearly and completely in conjunction with the accompanying drawings of the embodiments. It is understood that the described embodiments are only a part of the embodiments of the present application and not all embodiments of the present application. All other embodiments that a person skilled in the art devises based on the embodiments of the present application without creative effort fall within the scope of the present application.

[0010] The terms "first," "second," etc., used in the description and claims of this application are used to distinguish similar objects and not to describe a particular sequence or order. It should be understood that these terms may be interchanged under appropriate circumstances, so that the embodiments of this application may be implemented in orders other than those depicted or described herein, and the objects distinguished by "first," "second," generally belong to the same category and are not limited in number. For example, a first object may be a single object or a plurality of objects.Furthermore, in the description and claims, “and / or” indicates at least one of the related objects, and the character “ / ” generally represents an “or” relationship between the related objects mentioned before and after that character.

[0011] It is understood that "some embodiments" as mentioned throughout the specification means that particular features, structures, or characteristics related to the embodiments are included in at least one embodiment of the present application. Therefore, the phrase "in some embodiments" appearing throughout the specification does not necessarily refer to the same embodiment. Moreover, these particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0012] In the description of the present application, the terms "connected," "coupled," and "attached" are to be understood in a broad sense unless expressly stated and limited otherwise. This may, for example, be permanently connected, detachably connected, or integrated; may be mechanically connected, or electrically connected; may be directly connected, or indirectly connected via intermediate media; may be an internal communication between two elements, or may be an interaction relationship between two elements. A person skilled in the art may understand the specific meanings of the above terms in the present application depending on particular situations.

[0013] With reference to the Fig. 1 - 5 is Fig. 1 is a structural diagram of a particular embodiment of a battery device provided by the present application; Fig. 2 is a structural diagram of a battery pack made of Fig. 1; Fig. 3 is an exploded view of a battery pack from Fig. 2; Fig. 4 is a structural representation of an insulating cover plate made of Fig. 2; Fig. 5 is a structural diagram of an insulating cover plate made of Fig. 4 from a different angle.

[0014] The present embodiment provides a battery device comprising a battery pack 1 and a housing 2, wherein the housing 2 includes a bottom plate, the battery pack 1 is arranged inside the housing 2, and the battery pack 1 includes: a plurality of cylindrical battery cells 11, wherein an axial direction of each cylindrical battery cell 11 is parallel to the bottom plate and each cylindrical battery cell 11 has a terminal; a conductive busbar 12 connecting two adjacent cylindrical battery cells 11; and an insulating cover plate 13 arranged on a side of the cylindrical battery cells 11 where the terminals are located, wherein a wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 has a through-hole a, and the through-hole a and the conductive busbar 12 are at least partially offset.

[0015] In the battery device of the present application, the battery pack 1 is provided with the insulating cover plate 13 on the side of the cylindrical battery cells 11 where the terminals are located. The insulating cover plate 13 covers at least the terminals and the conductive busbar 12, thereby preventing condensate inside the battery device from directly falling onto the terminals or the conductive busbar 12 and causing a short circuit risk. A through-hole a is provided in the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12, which provides a direct heat dissipation channel for the cylindrical battery cells 11 on the side where the terminals are located.Heat generated during charging and discharging of the cylindrical battery cells 11 can quickly escape through the through-hole a, which reduces a local temperature rise at the junction between the terminals and the conductive busbar 12, avoids a deterioration in performance or accelerated aging due to heat buildup, and prevents condensation due to temperature differences between the surface of the battery pack 1 and other locations within the battery device, thereby further reducing the risk of short circuits. The through-hole a and the conductive busbar 12 are at least partially offset; in other words, the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 still partially covers the conductive busbar 12.In this case, the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 still maintains its insulating barrier function for the conductive busbar 12, thereby largely avoiding insulation failure of the conductive busbar 12.

[0016] As in the Fig. 1 and Fig. As shown in Figure 2, there are a plurality of conductive busbars 12, at least some of which are distributed along a longitudinal direction. There are a plurality of through-holes a spaced along the longitudinal direction. The longitudinal direction refers to the arrangement direction of the cylindrical battery cells 11.

[0017] With such an arrangement, the plurality of through-holes a distributed at intervals along the longitudinal direction can form a plurality of direct heat dissipation channels in the longitudinal direction. The heat generated at each conductive busbar 12 can escape through the nearest heat dissipation channel, improving the heat dissipation performance of the battery device. The distribution of a plurality of small-sized through-holes a can reduce the weakening of the structural strength of the insulating cover plate 13 compared to a single large-sized through-hole, ensure the structural strength of the insulating cover plate 13, and reduce the risk of failure of the insulating cover plate 13.

[0018] Furthermore, in some embodiments of the present application, a distance between two adjacent through holes a along the longitudinal direction is in a range of 10 mm to 100 mm.

[0019] If a distance between two adjacent through-holes is less than 10 mm, the distance between adjacent through-holes a is proven to be insufficient, which would reduce the structural strength of the wall section 131 of the insulating cover plate 13 facing the conductive busbar 12 and increase the risk of failure of the wall section 131 of the insulating cover plate 13 facing the conductive busbar 12. Furthermore, dense through-holes would reduce the effective coverage area of ​​the wall section 131 of the insulating cover plate 13 facing the conductive busbar 12, whereby condensate inside the battery device could potentially reach the terminals or the conductive busbar 12 through the through-holes a, causing a short circuit risk.If the distance between two adjacent through-holes a exceeds 100 mm, heat generated by the conductive bus bar 12 located between adjacent through-holes a cannot escape quickly, resulting in heat build-up inside the battery device and, due to temperature differences between the surface of the battery device and other internal parts of the battery, in the formation of condensation.The above-specified range for the distance between adjacent through-holes a thus ensures a sufficient heat dissipation area, reduces heat buildup of the battery device, largely avoids the formation of condensation due to temperature differences between the surface of the battery device and other internal locations of the battery device, and at the same time maintains a sufficient coverage area of ​​the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 across the connection side of the cylindrical battery cells 11.This keeps condensation away from the terminals or the conductive busbar 12, minimizes the risk of short circuits, and ensures the structural strength and stability of the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12, thereby reducing the risk of failure of the insulating cover plate 13 facing the conductive busbar 12.

[0020] The distance between adjacent through-holes a can be 10 mm, 30 mm, 50 mm, 70 mm, 100 mm, etc. When the distance between adjacent through-holes is 10 mm, while maintaining the structural strength of the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 and the waterproof performance of the insulating cover plate 13, the insulating cover plate 13 provides a maximum heat dissipation area, and the battery device thus has the highest heat dissipation efficiency. Accordingly, heat buildup in the battery device is greatly reduced, the temperature difference between the surface of the battery device and other locations inside the battery device is greatly reduced, the formation of condensation is greatly reduced, and the risk of a short circuit is reduced.When the distance between adjacent through-holes is 100 mm, while maintaining the heat dissipation performance of the battery device, the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 on the terminal-side of the cylindrical battery cell 11 has the largest coverage area, and the structural strength of the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 is the best, which maximizes the risk of failure of the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12. When the distance between two adjacent through-holes a is 30 mm, 50 mm, or 70 mm, a better balance between structural strength, waterproof performance, and heat dissipation performance can be achieved.

[0021] In addition, in some embodiments of the present application, the distance between the conductive bus bar 12 and the through hole a along the axial direction of the cylindrical battery cells 11 is in the range of 0 mm to 10 mm.

[0022] When the distance between the conductive busbar 12 and the through-hole a along the axial direction of the cylindrical battery cells 11 is greater than 10 mm, the non-functional area between the conductive busbar 12 and the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 is proven to be excessive, resulting in wasted space inside the battery device and a reduction in the energy density of the battery device. Thus, the specified distance value range between the conductive busbar 12 and the through-hole a along the axial direction can be 0 mm, 3 mm, 5 mm, 7 mm, 10 mm, etc., which reduces the amount of non-functional area between the conductive busbar 12 and the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12, minimizes internal space waste, and improves the energy density of the battery device.

[0023] The distance between the conductive bus bar 12 and the through hole a along the axial direction of the cylindrical battery cells 11 is preferably in the range of 1.5 mm to 8 mm, such as 1.5 mm, 3 mm, 5 mm, 8 mm, etc. This further reduces the amount of non-functional area between the conductive bus bar 12 and the wall portion 131 of the insulating cover plate 13 facing the conductive bus bar 12, further improves the energy density of the battery device, and a mounting clearance can be maintained between the conductive bus bar 12 and the wall portion 131 of the insulating cover plate 13 facing the conductive bus bar 12, which avoids mounting interference and makes the installation of the insulating cover plate 13 smoother.

[0024] In some embodiments of the present application, a ratio of the total area of ​​the through holes a to the area of ​​the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 is also in the range of 0.02 to 0.8.

[0025] When the ratio of the total area of ​​the through-holes a to the area of ​​the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 is less than 0.02, the total area of ​​the through-holes a is proven to be too small, resulting in insufficient heat dissipation area of ​​the heat dissipation channels provided by the insulating cover plate 13. This prevents timely heat dissipation from the battery device, leads to heat buildup, and thus causes condensation due to temperature differences between the surface of the battery device and other internal parts of the battery device.If the ratio of the total area of ​​the through-holes a to the area of ​​the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 exceeds 0.8, this indicates that the total area of ​​the through-holes is too large, which would excessively weaken the structural strength of the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12, thereby increasing the risk of failure of the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12.The excessive total area of ​​the through-holes a would also excessively reduce the coverage area of ​​the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 across the terminals or the conductive busbar 12, which increases the likelihood that condensate, when flowing along the wall portion, will penetrate through the through-holes a into the position of the terminals or the conductive busbar 12, thereby causing a short-circuit risk.The ratio of the total area of ​​the through holes a to the area of ​​the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 thus falls within the above value range, which ensures timely heat dissipation from the battery device, reduces heat buildup of the battery device, and avoids the formation of condensation due to temperature differences between the surface of the battery device and other internal locations of the battery device.At the same time, this maintains a sufficient coverage area of ​​the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 over the terminals or the conductive busbar 12, which reduces the likelihood that condensate in the battery device, when flowing along the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12, penetrates through the through holes a into the positions of the terminals or the conductive busbar 12, thereby reducing the risk of failure.

[0026] The ratio of the total area of ​​the through-holes a to the area of ​​the wall section 131 of the insulating cover plate 13 facing the conductive busbar 12 can be, in particular, 0.02, 0.1, 0.3, 0.5, 0.8, etc.When the ratio of the total area of ​​the through-holes a to the area of ​​the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 is 0.02, while maintaining sufficient heat dissipation capability of the battery device, the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 provides the maximum coverage area over the terminals or the conductive busbar 12, while minimizing the possibility that condensation inside the battery device, when flowing along the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12, reaches the position of the terminals or the conductive busbar 12 via the through-holes a, thereby reducing the risk of short circuits.When the ratio of the total area of ​​the through holes a to the area of ​​the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 is 0.8, while maintaining the waterproof performance of the insulating cover plate 13, the heat dissipation area of ​​the heat dissipation channel provided by the insulating cover plate 13 is maximized, which allows for fastest heat dissipation for the battery device, minimizes heat buildup, and avoids the generation of condensation due to temperature differences between the surface of the battery device and other internal parts of the battery device, thereby reducing the risk of short circuit.When the ratio of the total area of ​​the through holes a to the area of ​​the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 is 0.1, 0.3, or 0.5, a better balance between heat dissipation capability and waterproof performance is achieved.

[0027] In some embodiments of the present application, there are also a plurality of through-holes a, and the area of ​​a single through-hole a is in the range of 12mm 2 up to 500mm 2 .

[0028] If the area of ​​a single through hole a is less than 12mm 2The heat dissipation area via the single through-hole has been proven to be too small, causing poor heat circulation and preventing timely dissipation of the heat generated by the battery device, leading to heat buildup in the battery device and potential condensation. If the area of ​​a single through-hole is 500mm 2 exceeds , the area of ​​the single through-hole a is too large, which would cause the following disadvantages.

[0029] On the one hand, the oversized through-hole further weakens the structural strength of the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 and increases the risk of failure of the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12.

[0030] On the other hand, condensate inside the battery device, when running down the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12, is more likely to penetrate the terminal or conductive busbar 12 via the through-hole a, causing a short-circuit risk. Therefore, the area for a single through-hole a falls within the above-mentioned range, specifically 12 mm. 2 , 50mm 2 , 100mm 2 , 300mm 2 , 500mm 2 , etc., which leads to the following advantages: The heat generated by the battery device can be dissipated promptly, which reduces heat buildup inside the battery device and reduces the risk of condensation. The structural strength of the wall section 131 of the insulating cover plate 13 facing the conductive busbar 12 is ensured. The risk of failure of the wall section 131 of the insulating cover plate 13 facing the conductive busbar 12 is reduced. The probability of condensate penetrating through the through-hole a to the terminal or the conductive busbar 12 is reduced, and the risk of short circuits is reduced.

[0031] In some embodiments of the present application, a ratio of the total length of the through holes a to the total length of the wall portions 131 of the insulating cover plate 13 facing the conductive busbar 12 is also in the range of 0.1 to 0.7.

[0032] As in the Fig. 1 and Fig. 2, the total length of the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 is similar to the total length of the conductive busbar 12. If the ratio of the total length of the through-holes a to the total length of the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 is less than 0.1, the arrangement area of ​​the through-holes a in the length direction is too small, then only conductive busbars 12 near the through-holes can dissipate heat in a timely manner, heat from conductive busbars 12 located away from the through-holes cannot escape, resulting in insufficient heat dissipation performance and leading to heat accumulation in the battery device and potential condensation.If the ratio of the total length of the through-holes a to the total length of the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 is greater than 0.7, the arrangement area of ​​the through-holes a in the length direction becomes too large, which significantly weakens the structural strength of the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12, increases the risk of failure of the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12, increases the possibility that condensate, when flowing down the wall portion 131, will penetrate through the through-holes to the position of terminals or the conductive busbar 12, thereby bringing about the risk of short circuits.The ratio of the total length of the through holes a to the total length of the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 falling within the above value range thereby ensures efficiency of heat dissipation and reduces heat build-up inside the battery device while simultaneously reducing the risk of failure of the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12, thereby reducing the possibility of contact between condensate and terminals or conductive busbar 12 and thus reducing the risk of short circuit.

[0033] Specifically, the ratio of the total length of the through-holes a to the total length of the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 may be 0.1, 0.3, 0.5, 0.6, 0.7, etc. When the ratio of the total length of the through-holes a to the total length of the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 is 0.1, while ensuring the heat dissipation capability of the battery device, the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 has the maximum coverage area for the terminal or the conductive busbar 12, thereby minimizing the possibility of contact between the condensate inside the battery device and the terminal or the conductive busbar 12, thus reducing the risk of short circuits.When the ratio of the total length of the through holes a to the total length of the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 is 0.7, while ensuring the waterproof performance of the insulating cover plate 13, the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 has the maximum heat dissipation area, which can maximize the heat dissipation performance of the battery device and minimize the possibility of condensation. When the ratio of the total length of the through holes a to the total length of the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 is 0.3, 0.5, or 0.6, a better balance between the heat dissipation performance and waterproof performance of the battery device can be achieved.

[0034] In addition, in this embodiment, as in the Fig. 3 and Fig. 4, the through hole a is arranged in the height direction in a central portion of the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12. The height direction is perpendicular to the axial direction of the cylindrical battery cell 11.

[0035] Combined with Fig. 2, some conductive busbars 12 are arranged along the longitudinal direction near the upper end of the battery pack 1, while others are arranged along the longitudinal direction near the lower end of the battery pack 1. In this embodiment, the through-holes a are located in the middle section of the wall portion 131 in the height direction. That is, the through-holes are positioned between the upper and lower conductive busbars 12 in the height direction. This arrangement allows heat to escape from both the upper and lower conductive busbars 12 via the through-hole a, reducing the number of through-holes while maintaining heat dissipation performance.On the one hand, the structural strength and static stability of the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 can be ensured, thereby reducing the risk of failure of the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12. On the other hand, a sufficient coverage area of ​​the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 over the terminal side of the cylindrical battery cells 11 is ensured, which reduces the likelihood of condensate from the interior of the battery entering through the through holes a, thus reducing the risk of short circuits.

[0036] In some embodiments of the present application, the distance between the upper edge of the through-hole a and the upper edge of the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 is in the range of 35 mm to 45 mm.

[0037] If the distance between the upper edge of the through-hole a and the upper edge of the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 is less than 35 mm, the through-hole a would be proven to excessively occupy the insulation protection space for the upper conductive busbar 12 and cause the upper conductive busbar 12 to be overexposed at the through-hole a, thereby deteriorating the insulation performance of the upper conductive busbar 12. If the distance between the upper edge of the through-hole a and the upper edge of the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 is greater than 45 mm, the heat generated by the upper conductive busbar 12 cannot be dissipated quickly.Furthermore, in order to ensure that the through-hole a has a sufficient heat dissipation area, the through-hole a would excessively occupy the insulation protection space for the lower conductive busbar 12 and cause the lower conductive busbar 12 to be overexposed at the through-hole a, thereby degrading the insulation performance of the lower conductive busbar 12. At the same time, if the insulation performance of the lower conductive busbar 12 is to be ensured, the size of the through-hole a in the height direction would be too small, resulting in insufficient heat dissipation area and degrading the heat dissipation performance of the battery device. Therefore, the distance between the upper edge of the through-hole a and the upper edge of the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 falls within the above-mentioned range of values.The distance between the upper edge of the through-hole a and the upper edge of the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 may be 35 mm, 38 mm, 40 mm, 42 mm, 45 mm, etc. These values ​​can ensure the insulation performance for both the upper and lower conductive busbars 12 and ensure that the through-hole a has a sufficient heat dissipation area, thereby improving the heat dissipation performance of the battery device.

[0038] In some embodiments of the present application, the distance between the lower edge of the through-hole a and the lower edge of the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 also falls within the range of 35 mm to 45 mm.

[0039] If the distance between the bottom edge of the through-hole a and the bottom edge of the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 is less than 35 mm, the through-hole a would be proven to excessively occupy the insulation protection space for the lower conductive busbar 12 and cause the lower conductive busbar 12 to be overexposed at the through-hole a, thereby deteriorating the insulation performance of the lower conductive busbar 12. If the distance between the bottom edge of the through-hole a and the bottom edge of the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 is greater than 45 mm, the heat generated by the lower conductive busbar 12 cannot be dissipated quickly.Furthermore, in order to ensure that the through-hole a has a sufficient heat dissipation area, the through-hole a would excessively occupy the insulation protection space for the upper conductive busbar 12 and cause the upper conductive busbar 12 to be overexposed at the through-hole a, thereby degrading the insulation performance for the upper conductive busbar 12. At the same time, if the insulation performance for the upper conductive busbar 12 is to be ensured, the size of the through-hole a in the height direction would be too small, resulting in insufficient heat dissipation area and degrading the heat dissipation performance of the battery device. Therefore, the distance between the lower edge of the through-hole a and the lower edge of the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 falls within the above-mentioned range of values.The distance between the lower edge of the through-hole a and the lower edge of the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 may be 35 mm, 38 mm, 40 mm, 42 mm, 45 mm, etc. These values ​​can ensure the insulation performance for both the upper and lower conductive busbars 12 and ensure that the through-hole a has a sufficient heat dissipation area, thereby improving the heat dissipation performance of the battery device.

[0040] As in Fig. 4, in some embodiments of the present application, an adhesive layer 132 is provided in a region between the upper edge of the wall portion 131 of the insulating cover plate 13 facing the conductive bus bar 12 and the upper edge of the through hole a, and the adhesive layer 132 is attached to the conductive bus bar 12; and / or an adhesive layer 132 is provided in a region between the lower edge of the wall portion 131 of the insulating cover plate 13 facing the conductive busbar 12 and the lower edge of the through hole a, and the adhesive layer 132 is fixed to the conductive busbar 12.

[0041] With such an arrangement, the insulating cover plate 13 can be fixed to the conductive busbars 12 at an appropriate height via the adhesive layer 132, which improves the connection stability of the insulating cover plate 13 and the overall structural reliability of the battery device.

[0042] Furthermore, the shape of the through-hole a is not limited. In some embodiments, the through-hole a is an elongated structure extending along the longitudinal direction; in other embodiments, the through-hole a may have a round, square, or other shape.

[0043] The present embodiment also provides a battery device comprising the above-mentioned battery device.

[0044] The battery device of the present embodiment includes the above-mentioned battery device and thus has the same technical effects as the above-mentioned battery device, which will not be described again here.

[0045] The present embodiment also provides a vehicle including the above-mentioned battery device.

[0046] The vehicle of the present embodiment includes the above-mentioned battery device and thus has the same technical effects as the above-mentioned battery device, which will not be described again here.

[0047] The above description relates only to preferred embodiments of the present application. It should be noted that various improvements and developments may be made by those skilled in the art without departing from the principles of the present application, and these improvements and developments are also considered to be within the scope of the present application.

Claims

[1] A battery device comprising a battery pack and a housing, wherein the housing comprises a bottom plate, the battery pack is arranged inside the housing, and the battery pack comprises: a plurality of cylindrical battery cells, wherein an axial direction of each cylindrical battery cell is parallel to the bottom plate and each cylindrical battery cell has a terminal; a conductive busbar connecting two adjacent cylindrical battery cells; and an insulating cover plate arranged on a side of the cylindrical battery cells where the terminals are located, wherein a wall portion of the insulating cover plate facing the conductive busbar has a through-hole, and the through-hole and the conductive busbar are at least partially offset. [2] The battery device according to claim 1, comprising a plurality of conductive bus bars and a plurality of through holes, wherein at least some of the plurality of conductive bus bars are distributed along a longitudinal direction, the plurality of through holes are spaced along the longitudinal direction, and the longitudinal direction is an arrangement direction of the plurality of cylindrical battery cells. [3] The battery device according to claim 2, wherein a distance between two adjacent through holes along the longitudinal direction is in a range of 10mm to 100mm. [4] The battery device according to any one of claims 1 to 3, wherein a distance between the conductive bus bar and the through hole along the axial direction of the cylindrical battery cell is in the range of 0 mm to 10 mm. [5] The battery device according to any one of claims 1 to 4, wherein a ratio of a total area of ​​the through-hole to an area of ​​the wall portion of the insulating cover plate facing the conductive bus bar is in the range of 0.02 to 0.

8. [6] A battery device according to any one of claims 1 to 5, comprising a plurality of through-holes, and an area of ​​each through-hole in the range of 12mm 2 to 500mm 2 lies. [7] The battery device according to any one of claims 1 to 6, wherein a ratio of the total length of the through-hole to a total length of the wall portion of the insulating cover plate facing the conductive bus bar is in the range of 0.1 to 0.

7. [8] The battery device according to any one of claims 1 to 7, wherein the through-hole is located in a height direction in a central portion of the wall portion of the insulating cover plate facing the conductive bus bar, and wherein the height direction is perpendicular to the axial direction of the cylindrical battery cell. [9] The battery device according to any one of claims 1 to 8, wherein a distance between an upper edge of the through-hole and an upper edge of the conductive busbar-facing wall portion of the insulating cover plate in a direction perpendicular to the axial direction of the cylindrical battery cell is in the range of 35mm to 45mm. [10] The battery device according to any one of claims 1 to 9, wherein a distance between a lower edge of the through-hole and a lower edge of the conductive busbar-facing wall portion of the insulating cover plate in a direction perpendicular to the axial direction of the cylindrical battery cell is in the range of 35mm to 45mm. [11] The battery device according to any one of claims 1 to 10, wherein an adhesive layer is provided in a region between an upper edge of the conductive busbar-facing wall portion of the insulating cover plate and an upper edge of the through-hole, and the adhesive layer is attached to the conductive busbar; and / or an adhesive layer is provided in a region between a lower edge of the wall portion of the insulating cover plate facing the conductive busbar and a lower edge of the through-hole, and the adhesive layer is attached to the conductive busbar. [12] The battery device according to any one of claims 1 to 11, wherein the through-hole is an elongated structure extending along the longitudinal direction. [13] The battery device according to any one of claims 1 to 12, wherein the through-hole is a round structure extending along the longitudinal direction. [14] The battery device according to any one of claims 1 to 13, wherein the through-hole is a square structure extending along the longitudinal direction. [15] A vehicle comprising the battery device according to any one of claims 1 to 14.

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