Battery pack box body, battery pack and electric equipment

Abstract

The utility model relates to the technical field of batteries, and particularly provides a battery pack box body which comprises a heat exchange plate, the bottom protection plate is arranged below the heat exchange plate, the bottom protection plate and the heat exchange plate are in sealed connection at the edge, a cavity is formed between the bottom protection plate and the heat exchange plate, an air tightness detection opening is formed in the bottom protection plate, and a plugging piece is detachably installed on the air tightness detection opening, so that the cavity is selectively communicated with the outside of the battery pack box body. According to the structure provided by the utility model, independent air tightness detection is directly carried out on the cavity between the bottom protective plate and the heat exchange plate, and the air tightness of the cavity passing the air tightness detection is good, so that accumulated liquid is difficult to form in the cavity, and the liquid cooling plate is prevented from being corroded due to the influence of the accumulated liquid.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and specifically provides a battery pack box, a battery pack and electrical equipment. Background Art

[0002] With the development of science and technology and the rise of environmental awareness, new energy vehicles have attracted more and more attention due to their low pollution and low noise characteristics. New energy vehicles refer to vehicles that use unconventional automotive fuels as a power source (or use conventional automotive fuels and adopt new vehicle power devices), and integrate advanced technologies in vehicle power control and drive to form vehicles with advanced technical principles, new technologies, and new structures. Among new energy vehicles, pure electric vehicles have become a hot spot for the development of new energy vehicles. Batteries, as the main power source, are an indispensable part of new energy vehicles.

[0003] In the prior art, mainstream battery pack cases integrate water cooling to exchange heat between batteries and maintain the temperature of the batteries. A common form of water cooling is that the cooling liquid is passed through the flow channel of a heat exchange plate (also called a cold plate) made by an integrated stamping braze to achieve contact heat exchange with the battery cells. The heat exchange plate is usually arranged at the bottom of the case, and a bottom guard plate is further arranged outside the heat exchange plate to resist stone impact, mopping and other working conditions.

[0004] Therefore, a closed chamber is formed between the heat exchange plate and the bottom guard plate, and condensed water accumulates in this part due to frequent temperature changes in the heat exchange plate, which may cause corrosion and rust of the heat exchange plate and the bottom guard plate. Utility Model Content

[0005] The utility model aims to solve the above technical problems, that is, to solve the problem that the heat exchange plate and the bottom guard plate of the existing battery pack box are susceptible to corrosion. To this end, the utility model provides a battery pack box, characterized in that it includes: a heat exchange plate; a bottom guard plate, the bottom guard plate is arranged below the heat exchange plate, the bottom guard plate and the heat exchange plate are sealed at the edge and a chamber is formed between the bottom guard plate and the heat exchange plate, and an airtight detection port is provided on the bottom guard plate, and a plugging member is detachably installed on the airtight detection port, so that the chamber can be selectively connected to the outside of the battery pack box.

[0006] In the optional technology of the present utility model, a nut is fixedly provided on the first side of the bottom guard plate facing the chamber, and the nut hole of the nut is arranged opposite to the airtight detection port; the sealing member includes a sealing portion and a threaded connection portion, and the sealing member is connected to the nut and installed to the airtight detection port via the threaded connection portion, and the sealing portion is located on the second side of the bottom guard plate and covers the airtight detection port.

[0007] In an optional technology of the present invention, the nut is welded to the first side surface of the bottom guard plate.

[0008] In an optional technology of the present invention, a seal is provided between the second side surface of the bottom guard plate and the sealing portion.

[0009] In an optional technology of the utility model, the airtight detection port is a circular hole with the same diameter as the nut hole, and the nut hole diameter is 4mm-16mm.

[0010] In an optional technology of the present utility model, the thickness of the nut is 3mm-8mm, and the pitch of the nut is 0.5mm-1.2mm.

[0011] In an optional technology of the present invention, the blocking member further includes a screwing portion, and the screwing portion is protruding or recessed in the blocking portion.

[0012] In an optional technology of the present utility model, the bottom guard plate has a recessed portion, the recessed portion is recessed toward the chamber compared to a reference plane of the bottom guard plate, and the airtight detection port is provided in the recessed portion.

[0013] A battery pack comprises any one of the battery pack cases described above.

[0014] An electrical device comprises the above-mentioned battery pack.

[0015] In the case of adopting the above technical solution, the utility model sets an air tightness detection port on the bottom guard plate, which can directly perform an independent air tightness detection on the chamber between the bottom guard plate and the heat exchange plate to ensure that the chamber has good air tightness. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0017] Figure 1 It is an exploded schematic diagram of the stacked structure of the box heat exchange plate and the bottom guard plate in the utility model;

[0018] Figure 2 It is a schematic diagram of the specific structure of the front side of the midsole guard plate, the nut and the blocking member of the utility model;

[0019] Figure 3 The utility model is a midsole guard plate

[0020] Figure 4 It is a schematic diagram of the specific structure of the back bottom guard plate and the blocking member of the bottom guard plate of the utility model;

[0021] Figure 5 It is a schematic diagram of the cross-sectional structure of the structure between the heat exchange plate and the bottom guard plate in the utility model;

[0022] Figure 6It is a specific structural schematic diagram of the blocking member in the utility model. DETAILED DESCRIPTION

[0023] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not used to limit the protection scope of the present invention. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0024] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the relevant devices or components must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, ordinal numbers such as "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0025] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Furthermore, in order to more clearly demonstrate the core technical solution of the present utility model, the description of the well-known structure of the battery pack case is omitted in the following description. However, this omission is only for the convenience of description and does not mean that the battery pack case can be without these structures.

[0027] After research, it was found that the reason why condensed water gathered in the chamber between the bottom guard plate and the heat exchange plate is that the air tightness of the chamber is not guaranteed. Therefore, the water vapor in the outside air is affected by the low-temperature coolant in the heat exchange plate 1 and continuously condenses in this space. At this point, the condensed water formed eventually leads to the rust of related structures, especially for the integral stamped and brazed heat exchange plates, which are usually made of metal; this situation also exists for the metal bottom guard plate. If you want to avoid this problem, you can spray an anti-rust coating on the relevant surfaces of the heat exchange plate and the bottom guard plate, but this solution will undoubtedly greatly increase the cost of the battery pack body. Therefore, it is necessary to eliminate this problem from the root, that is, to ensure the air tightness of the chamber.

[0028] In conventional solutions, in order to improve the air tightness of the chamber, the connection position between the heat exchange plate at the bottom of the frame and the bottom guard plate in the battery pack box is usually sealed, including sealant and other structures to enhance the seal. However, none of the above sealing solutions can guarantee that the air tightness is absolutely up to standard; and this part of the space is difficult to test for air tightness due to its narrow structure.

[0029] For this reason Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the utility model proposes a box structure, including: a frame (not shown) forming a battery accommodating space, a heat exchange plate 1 arranged at the bottom of the frame; a bottom guard plate 2 arranged below the heat exchange plate 1, the bottom guard plate 2 and the heat exchange plate 1 are sealed and connected at the edge, that is, below the frame body of the frame, and at the same time, because the edge position of the bottom guard plate 2 is set as a sink toward the frame body compared to the overall setting, a chamber is formed between the bottom guard plate 2 and the heat exchange plate 1, and an airtight detection port 21 is provided on the bottom guard plate 2, and a sealing member 4 is provided on the airtight detection port 21, and the sealing member 4 is selectively removed or installed to realize whether the chamber is connected to the external environment.

[0030] In the above-mentioned embodiment, the airtightness detection port 21 is directly opened on the bottom guard plate 2. When a sealing test is required, the sealing component 4 is removed, and the airtightness test is directly performed by injecting pressurized gas into the airtightness detection port 21. After the test, the sealing component 4 is installed back to achieve sealing again.

[0031] The above structure realizes independent air tightness test of the chamber between the bottom guard plate 2 and the heat exchange plate 1. When the air tightness test is passed, even if the water vapor in the air in the chamber is condensed by the low-temperature coolant in the heat exchange plate 1, the condensed water formed by the condensation is extremely small due to the good air tightness of the chamber itself and the limited space, and it is difficult to form liquid accumulation in the chamber, which prevents the liquid cooling plate from being corroded by the accumulation of liquid.

[0032] It should be noted that although the above content mentions structures such as the frame of the battery pack case, the main purpose is to facilitate a better description of the relative relationship between the heat exchange plate 1 and the bottom guard plate 2 in the present invention from the perspective of a conventional battery pack case. These structures are irrelevant to the technical problems that the present invention actually needs to solve and cannot be regarded as limitations on the present invention.

[0033] Normally, the bottom guard plate 2 itself is a single plate structure, and its thickness is generally no more than 1mm to 2mm, and the height of the chamber is limited, generally only 3mm to 10mm; the thin plate structure of the bottom guard plate 2 makes it difficult to directly set the plugging piece 4 at the position of the airtight detection port 21 while ensuring the sealing effect; and the limited height of the chamber determines that the structure of the plugging piece 4 on the airtight detection port 21 needs to be small and simple. How to set a perfect plugging structure in this part so that it can be disassembled during airtightness testing, and can be installed in a sealed manner during product application without affecting the structural strength of the bottom plate is worth considering.

[0034] Therefore, how to make appropriate designs for the airtight detection port 21 and the blocking member 4 in accordance with the special scenarios of the chamber: Figure 2 , Figure 4 , Figure 5 As shown, a nut 3 is welded at the position of the airtight detection port 21 on the bottom guard plate 2, and the nut 3 is located on the inner wall surface of the bottom guard plate 2. The plugging member 4 includes a plugging portion 41 and a threaded connection portion 42. The plugging member 4 is connected to the nut 3 through the threaded connection portion 42 and installed to the airtight detection port 21. When the plugging member 4 is installed, the plugging portion 41 is located on the outer wall surface of the bottom guard plate 2, and its size can cover the airtight detection port 21, ensuring the airtightness of the airtight detection port 21 after the plugging portion 41 is installed.

[0035] A seal 5 is provided between the sealing portion 41 and the outer wall surface of the bottom guard plate 2 .

[0036] Optional, such as Figure 5 As shown, the sealing member 5 is an annular sealing ring. The sealing member 5 can also be a sealant coated between the blocking portion 41 and the outer wall surface of the bottom guard plate 2.

[0037] The above-mentioned inner wall surface refers to the first side surface of the bottom guard plate 2 facing the cavity; correspondingly, the outer wall surface is the second side surface of the bottom guard plate 2 facing the external space of the battery pack box.

[0038] It should be understood that, since the purpose of the above design is to perform airtight detection on the first chamber alone and to achieve sealability at the airtight detection port 21, the airtight detection port 21 and the nut 3 should have a good match: the diameter of the airtight detection port 21 itself should not be too large, otherwise the sealing portion 41 and the sealing member 5 cannot form a good seal on the outer wall surface of the bottom guard plate 2. One optional solution is that the aperture of the airtight detection port 21 is exactly the same as that of the nut 3.

[0039] Therefore, as an embodiment, the airtightness detection port 21 is set as a circular hole penetrating the bottom guard plate 2, and the nut hole of the nut 3 is arranged opposite to the circular hole of the airtightness detection port 21. Further, the diameter of the circular hole is the same as the nominal diameter of the nut hole, ranging from 4mm to 16mm.

[0040] Due to the height of the chamber, the thickness of the nut 3 should be within 80% of the chamber height; in this way, when performing air tightness testing, the testing equipment can easily and quickly introduce high-pressure gas into the chamber.

[0041] Therefore, as an optional solution, the thickness of the nut 3 is 3mm-8mm, which does not exceed 80% of the distance between the bottom plate and the bottom guard plate 2, and this height will not affect the gas from the airtight detection port 21; the corresponding internal thread pitch of the nut 3 is set to 0.5mm-1.2mm; the pitch of the threaded connection part 42 is also 0.5mm-1.2mm. The relationship between the size of the pitch and the thickness of the nut 3 determines that the threaded connection part 42 is screwed into the nut 3 for no less than three turns, and the plugging member 4 can be installed on the bottom guard plate 2 with a suitable torque; the annular sealing ring is squeezed by the corresponding strength of the plugging part 41, forming a better sealing effect.

[0042] Optionally, the general bottom guard plate 2 is made of metal, and the nut 3 is also made of metal. The nut 3 can be fixed to the bottom guard plate 2 by welding.

[0043] Optionally, in a practical application, after welding a small piece of metal that meets the above thickness requirements to the bottom guard plate 2, the corresponding position of the bottom guard plate 2 is directly machined with a tapping tool of the corresponding pitch, and the round hole of the airtight detection port 21 and the internal thread of the "nut" can be directly formed. In the solution of the utility model, the nut structure is fixedly connected to the bottom guard plate 2, and the nut does not need to be actively removed from the threaded connection part 42; therefore, it should be understood that from the perspective of form and function, the small piece of metal after machining also meets the identification of a nut, and it cannot be denied that it becomes a nut after being installed on the bottom guard plate 2 because it does not have the characteristics of a nut in its original state.

[0044] Of course, from the perspective of cost, the solution of using conventional nuts is more suitable. Accordingly, after drilling a through hole with the same nominal diameter as the nut hole on the bottom guard plate 2, the conventional nut is welded and fixed correspondingly to the through hole.

[0045] Of course, the nut 3 can also be fixedly connected to the inner wall surface of the bottom guard plate 2 by other means. For example, when the bottom guard plate 2 is made of non-metallic material, the nut 3 with a bushing can be glued to the inner wall surface of the bottom guard plate 2 to achieve fixation.

[0046] Optional, such as Figure 5 , Figure 6 As shown, the plugging member 4 further includes a screwing portion 43. The screwing portion 43 can realize a convenient and detachable connection between the plugging member 4 and the nut 3. The screwing portion 43 can be a protrusion on the plugging portion 41, and the protruding screwing portion 43 can be a hexagonal shape (such as Figure 6a); the screwing portion 43 may also be recessed in the blind hole of the blocking portion 41, the blind hole shape includes a regular hexagon ( Figure 6 b) Cross slots and other shapes that are easy to use with installation tools.

[0047] As a specific implementation, the plugging member 4 uses a bolt with a flange, the screw portion of which is the above-mentioned threaded connection portion 42, the flange is the plugging portion 41, and the screwing portion 43 is set as a hexagonal bolt head located outside the flange. The effect of using a bolt with a flange is that the sealing effect of the bolt installed in the rear chamber of the bottom guard plate 2 can be better improved through the cooperation between the flange and the sealing space 5.

[0048] Similarly, the reason why the blocking member 4 uses bolts is that bolts are conventional components, and bolts that meet the above requirements can be directly used to reduce costs.

[0049] Optionally, the bolts may be made of metal or polymer material.

[0050] like Figure 3 , Figure 4 As shown, the bottom guard plate 2 of the battery pack box has a recessed portion 22, which is recessed into the cavity compared to the reference plane of the bottom guard plate 2. When the bottom guard plate 2 is made of metal, the recessed portion 22 is formed by metal stamping. By providing such a plurality of recessed portions 22, the overall rigidity of the bottom guard plate 2 can be enhanced. At the same time, as a specific embodiment of the present utility model, the airtight detection port 21 is located in the recessed portion 22. Through such a setting, the blocking portion 41 of the blocking member 4 can be accommodated in the recessed portion 22, so as to achieve the overall flatness of the bottom of the battery pack.

[0051] In general, such as Figure 3 As shown, the bottom guard plate 2 may have a plurality of recessed portions 22, but the airtightness detection port 21 may be disposed on only one of the recessed portions, so as to reduce the complexity of the overall structure and improve the reliability of the structure.

[0052] In addition, the blocking member 4 can be connected to the inner wall surface in other ways, such as the blocking member 4 can be directly clamped on the bottom guard plate 2 by clamping, the buckle of the blocking member 4 passes through the airtight detection port 21 and is clamped on the inner wall surface of the bottom guard plate 2, and the sealing member 5 is also provided at the outer wall surface of the bottom guard plate 2 where the blocking member 4 contacts.

[0053] A battery pack comprises any one of the battery pack cases described above.

[0054] An electrical device comprises the above-mentioned battery pack.

[0055] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A battery pack box, characterized in that: include: Heat exchange plate (1); A bottom guard plate (2), the bottom guard plate (2) being arranged below the heat exchange plate (1), the bottom guard plate (2) being sealed and connected to the heat exchange plate (1) at the edge and a chamber being formed between the bottom guard plate (2) and the heat exchange plate (1), the bottom guard plate (2) being provided with an airtight detection port (21), a sealing member (4) being detachably mounted on the airtight detection port (21), so that the chamber can be selectively connected to the outside of the battery pack box.

2. The battery pack case according to claim 1, characterized in that: A nut (3) is fixedly arranged on a first side surface of the bottom guard plate (2) facing the chamber, and a nut hole of the nut (3) is arranged opposite to the airtight detection port (21); The sealing member (4) comprises a sealing portion (41) and a threaded connection portion (42); the sealing member (4) is connected to the nut (3) via the threaded connection portion (42) and installed on the airtight detection port (21); the sealing portion (41) is located on the second side surface of the bottom guard plate (2) and covers the airtight detection port (21).

3. The battery pack case according to claim 2, characterized in that: The nut (3) is welded to the first side surface of the bottom guard plate (2).

4. The battery pack case according to claim 2, characterized in that: A sealing member (5) is provided between the second side surface of the bottom guard plate (2) and the sealing portion (41).

5. The battery pack case according to claim 2, characterized in that: The airtight detection port (21) is a circular hole with the same diameter as the nut hole, and the nut hole diameter is 4 mm-16 mm.

6. The battery pack case according to claim 2, characterized in that: The thickness of the nut (3) is 3 mm to 8 mm, and the pitch of the nut (3) is 0.5 mm to 1.2 mm.

7. The battery pack case according to claim 2, characterized in that: The blocking member (4) further comprises a screwing portion (43), wherein the screwing portion (43) is protruding or recessed from the blocking portion (41).

8. The battery pack case according to claim 1, characterized in that: The bottom guard plate (2) has a recessed portion (22), the recessed portion (22) is recessed toward the chamber relative to a reference plane of the bottom guard plate (2), and the airtight detection port (21) is arranged in the recessed portion (22).

9. A battery pack, characterized in that: A battery pack case comprising the battery pack case described in any one of claims 1 to 8.

10. An electrical device, characterized in that: Comprising the battery pack described in claim 9.

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