DE212024000100U1 - Battery pack housing, battery pack and vehicle - Google Patents

Abstract

A battery pack housing, the battery pack housing comprising:
a shell forming a receiving cavity with an opening;
a flow channel plate disposed on a side of the shell facing away from the receiving cavity, the flow channel plate having a first recess recessed in a direction away from the shell, the shell and the first recess being spaced apart from each other and surrounding each other to form a flow channel used for the flow of cooling fluid;
a cover plate that is placed over the opening to close the receiving cavity,
wherein the shell is a composite panel formed by punching.

Description

This application claims priority to Chinese Patent Application No. 2024228897089, filed on November 25, 2024, entitled “Battery pack case, battery pack and vehicle,” and claims priority to Chinese Patent Application No. 2024211514563 , filed on May 24, 2024, entitled “Battery Pack and Vehicle,” which is hereby incorporated by reference in its entirety.

TECHNICAL FIELD

This application relates to the field of battery technology, in particular to a battery pack housing, a battery pack and a vehicle.

STATE OF THE ART

The battery pack provides the power for vehicles with alternative drive technology. The battery pack typically consists of a shell, a battery cell module, and a cooling plate. The cooling plate consists of the upper and lower flow channel plates. The cooling plate is mounted in the battery pack housing, and the battery cell module is bonded to the flow channel plate with adhesive to secure the battery cell module and realize its cooling and heating functions. The flow channel is formed by punching on the upper flow channel plate and/or the lower flow channel plate and serves to guide the coolant flow.

In the related technology, the upper flow channel plate and the lower flow channel plate are first welded together and then bolted or riveted to the battery pack casing. The assembly is complicated, and the overall height of the battery pack is relatively large.

SUMMARY OF THE UTILITY MODEL

The present application relates to a battery pack case, a battery pack and a vehicle for reducing the overall height of the battery pack case and the battery pack and increasing the reliability of the battery pack.

In order to solve the above-mentioned technical problems, the present application proposes a battery pack housing, the battery pack housing comprising: a shell forming a receiving cavity having an opening; a flow channel plate arranged on the side of the shell facing away from the receiving cavity, the flow channel plate having a first recess recessed in a direction away from the shell, the shell and the first recess being spaced apart from each other and surrounding each other to form a flow channel used for the flow of cooling liquid; a cover plate fitted over the opening to close the receiving cavity, the shell being a composite plate formed by stamping.

In some embodiments, the composite panel comprises at least a first aluminum layer and a second aluminum layer, wherein the first aluminum layer and the second aluminum layer have at least partially different alloy compositions.

In some embodiments, the flow channel plate is disposed on the side of the bottom wall of the tray facing away from the receiving cavity, and wherein the battery pack housing also comprises: a bottom cover plate disposed on the side of the flow channel plate facing away from the bottom wall.

In some embodiments, the battery pack housing also includes a buffer component disposed between the bottom cover plate and the flow channel plate.

In some embodiments, the shell is provided with two spaced-apart first side walls and two oppositely disposed second side walls; wherein, along the thickness direction of the flow channel plate, the size of the first side walls is larger than the size of the second side walls.

In some embodiments, the flow channel plate is arranged on the side of the bottom wall of the shell facing away from the receiving cavity; wherein the flow channel plate has a weld zone and a non-weld zone, wherein the flow channel is arranged in the non-weld zone and the weld zone is welded to the bottom wall; wherein the non-weld zone and the bottom wall are spaced apart from and surrounded by each other to form a plurality of gaps; wherein the thickness of the flow channel plate is defined as T ₁ , wherein along the width direction of the flow channel plate the size of the gaps is defined as L ₁ , and L ₁ ≤20 T ₁ ; and/or along the thickness direction of the flow channel plate the size of the bottom wall is defined as T ₂ , and T ₂ ≤2 T ₁ .

In some embodiments, the safety factor of the battery pack enclosure is defined asα, where the size of the flow channel is along the thickness direction of the flow channel plate is defined as H ₁ , H ₁ ≤αL ₁ , 1.2≤α < 1.5.

In some embodiments, the thickness of the flow channel plate is defined as T ₁ , where the size of the flow channel along the thickness direction of the flow channel plate is defined as H ₁ , and H ₁ ≤5T ₁ .

The present application proposes a battery pack, the battery pack comprising: the above-mentioned battery pack case; a battery cell module arranged in the receiving cavity.

The present application proposes a battery pack, the battery pack comprising a tray, a flow channel plate and a cover plate, the flow channel plate being mounted on the bottom wall of the tray, the flow channel plate having a first recess recessed in a direction close to the bottom wall of the tray, the cover plate being placed on the side of the flow channel plate facing away from the bottom wall of the tray, the cover plate and the first recess being spaced apart from each other and surrounding each other to form a flow channel used for the flow of cooling liquid, the thickness of the flow channel plate being T ₁ , the height of the flow channel along the thickness direction of the flow channel plate being H ₁ and 1.5T ₁ ≤H ₁ ≤4T ₁ .

In some embodiments, the thickness of the bottom wall of the tray is T ₂ and the thickness of the cover plate is T ₃ , where T ₂ < T ₁ ; and/or, T ₃ < T ₁ .

In some embodiments, the flow channel plate also includes a second recess recessed in a direction close to the bottom wall of the shell, and wherein one side of the second recess is connected to the bottom wall of the shell, the other side of the second recess and the cover plate are spaced apart and surrounding each other to form a cavity structure; wherein along the thickness direction of the flow channel plate, the height of the cavity structure is H ₂ , and H ₁ ≤4T ₁ < H ₂ .

In some embodiments, the thickness of the bottom wall of the tray is T ₂ and the thickness of the cover plate is T ₃ , where T ₂ < T ₁ and T ₃ < T ₁ , the distance between the two opposite sides of the cover plate and the bottom wall of the tray being L, the safety factor of the battery pack being defined as α, where L > 7αT ₁

In some embodiments, 1.2≤α < 1.5.

In some embodiments, the first recess and the second recess are arranged parallel to each other and offset along a predetermined direction.

In some embodiments, the battery pack also comprises the battery cell module, wherein the battery cell module is mounted on the side of the cover plate facing away from the flow channel plate, wherein the area of the side of the cover plate used for mounting the battery cell module is S ₁ , wherein the actual contact area between the battery cell module and the flow channel plate is S ₂ , and wherein the projected area of the flow channel plate at the bottom wall of the shell is S ₃ , and S ₂ < S ₁ < S ₃ .

In some embodiments, the flow channel plate comprises a main board and a flange, wherein the flange is disposed around the perimeter of the main board and the flange is connected to the side wall of the shell.

In some embodiments, the cover plate, the flow channel plate, and the shell are all made of steel, and the cover plate and the flow channel plate are welded, wherein the flow channel plate and the shell are welded, or wherein the cover plate is made of aluminum, and wherein the flow channel plate and the shell are made of steel, wherein the cover plate is bonded to the flow channel plate, and wherein the flow channel plate and the shell are welded together.

The present application proposes a vehicle, the vehicle comprising the battery pack described above.

The advantageous effect of the technical solution of the present application is that the battery pack housing provided by the present application comprises a shell, a flow channel plate, and a cover plate; wherein the shell forms a receiving cavity with an opening, wherein the flow channel plate is arranged on the side of the shell facing away from the receiving cavity, wherein the flow channel plate has a first recess recessed in a direction away from the shell, wherein the shell and the first recess are spaced apart from each other and surround each other to form a flow channel used for the flow of cooling liquid; wherein the cover plate is placed on the opening to close the receiving cavity, wherein the shell is a composite plate formed by stamping. On the one hand, A flow channel is formed between the shell and the first recess, so that the shell is used as the upper flow channel plate of the flow channel, thereby eliminating the upper flow channel plate, improving the integration of the battery pack case and reducing the overall height and assembly complexity of the battery pack case. On the other hand, the shell is a stamped composite plate, which can improve the structural strength and sealing of the shell, thereby improving the reliability of the battery pack. On the other hand, in the present application, the flow channel plate is attached to the outside of the shell. This can reduce the impact of the coolant in the flow channel plate on internal components such as the battery cell module, thereby further improving the reliability of the battery pack.

BRIEF DESCRIPTION OF THE DRAWINGS

• 1 ist ein schematisches Strukturdiagramm einer Ausführungsform eines Batteriepacks der vorliegenden Anmeldung;
• 2 ist eine schematische Darstellung der Explosionsstruktur der Ausführungsform von 1;
• 3 ist ein schematisches Strukturdiagramm einer Ausführungsform eines Batteriepackgehäuses der vorliegenden Anmeldung;
• 4 ist ein schematisches Diagramm der Explosionsstruktur der Ausführungsform von 3;
• 5 ist ein schematisches Strukturdiagramm der Schale in der Ausführungsform von 3;
• 6 ist ein schematisches Strukturdiagramm der Strömungskanalplatte in der Ausführungsform von 3;
• 7 ist ein schematisches Strukturdiagramm eines Teils der Struktur der Ausführungsform von 1;
• 8 ist eine schematische Darstellung der Querschnittsstruktur entlang A-A in der Ausführungsform von 7;
• 9 ist eine schematische Darstellung einer Explosionsstruktur einer anderen Ausführungsform eines Batteriepacks, das in der vorliegenden Anmeldung vorgesehen ist;
• 10 ist eine schematische Draufsicht einer anderen Ausführungsform einer Schale, das in der vorliegenden Anmeldung vorgesehen ist;
• 11 ist eine schematische Draufsicht einer anderen Ausführungsform einer Strömungskanalplatte, die von der vorliegenden Anmeldung bereitgestellt wird;
• 12 ist eine schematische Draufsicht einer anderen Ausführungsform eines Batteriepacks, das von der vorliegenden Anmeldung bereitgestellt wird;
• 13 ist eine schematische Querschnittsdarstellung von 12 entlang der Linie A-A;
• 14 ist ein vergrößertes schematisches Diagramm der Struktur bei B in 13.

To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly presents the drawings necessary for describing the embodiments. Obviously, the drawings described below represent only some embodiments of the present application. Those skilled in the art will be able to obtain additional drawings based on these drawings without any design work, including:

• 1 is a schematic structural diagram of an embodiment of a battery pack of the present application;
• 2 is a schematic representation of the exploded structure of the embodiment of 1 ;
• 3 is a schematic structural diagram of an embodiment of a battery pack case of the present application;
• 4 is a schematic diagram of the exploded structure of the embodiment of 3 ;
• 5 is a schematic structural diagram of the shell in the embodiment of 3 ;
• 6 is a schematic structural diagram of the flow channel plate in the embodiment of 3 ;
• 7 is a schematic structural diagram of a part of the structure of the embodiment of 1 ;
• 8 is a schematic representation of the cross-sectional structure along AA in the embodiment of 7 ;
• 9 is a schematic diagram of an exploded structure of another embodiment of a battery pack provided in the present application;
• 10 is a schematic plan view of another embodiment of a tray provided in the present application;
• 11 is a schematic plan view of another embodiment of a flow channel plate provided by the present application;
• 12 is a schematic plan view of another embodiment of a battery pack provided by the present application;
• 13 is a schematic cross-sectional view of 12 along line AA;
• 14 is an enlarged schematic diagram of the structure at B in 13 .

DESCRIPTION OF THE EMBODIMENTS

The present application will be described in more detail below in conjunction with the accompanying drawings and embodiments. It is particularly noted that the following embodiments are merely illustrative of the present application and do not limit the scope of the present application. Likewise, the following embodiments are only some embodiments of the present application and not all embodiments. All other embodiments that can be achieved by ordinary technicians in the field without creative effort are within the scope of this application.

When describing the embodiments of the present application, it should be noted that, unless otherwise clearly stated and limited, the terms "connected" and "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integrated connection. It may be a mechanical connection or an electrical connection. It may be directly connected or indirectly connected via an intermediate medium. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present application depending on the specific circumstances.

In the embodiments of the present application, unless otherwise clearly stated and limited, the first feature "on" or "under" the second feature may mean that the first and second features are in direct contact or that the first and second features are connected by an intermediate part. Furthermore, a first feature being "above,""over," and "on" a second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher level than the second feature. A first feature being "below,""below," or "beneath" a second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

Throughout the description of this specification, reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refers to specific features described in connection with the embodiment or example. A structure, material, or feature is included in at least one embodiment or example of the present application. Throughout the present specification, the exemplary expressions of the above terms do not necessarily refer to the same embodiment or example. The described specific features, structures, materials, or properties may be combined in one or more embodiments or examples in any suitable manner. Furthermore, those skilled in the art may combine and link various embodiments or examples and features of various embodiments or examples described in this specification without mutual contradiction.

In the current art, the battery pack casing and the flow channel plate are generally two types of components that require assembly and integration with a large number of fasteners during use. In order to reserve installation space for the flow channel plate, it usually occupies part of the height of the battery pack, resulting in wasted space. The flow channel plate is generally divided into an upper flow channel plate and a lower flow channel plate, which are joined as a whole by brazing and then connected to the battery pack casing by bolts or rivets. However, the battery pack casing with this structure suffers from problems such as a complex assembly process, a large battery pack height, low structural strength, and the fact that the coolant is easy to affect the internal components of the battery pack.

To this end, the present application proposes a battery pack case and a battery pack, wherein the battery pack case and the flow channel plate are designed as a whole, which reduces the complexity of the process of assembling the two together. The installation space required for the flow channel plate can be saved in the height direction of the battery pack (approximately 10 mm can be saved), leaving more space for other components (e.g., to increase the cruising range, larger battery cells with larger capacities can be used). In this application, the upper flow channel plate is omitted. The tray serves as a support for the battery cell module and internal components and takes over the role of the upper flow channel plate. In the unusual case of a coolant leak in the battery pack, the coolant cannot flow into the battery pack, which may lead to short circuits and corrosion.

The present application first proposes a battery pack as described in the 1 and 2 shown. 1 is a schematic structural diagram of an embodiment of the battery pack of the present application. 2 is a schematic representation of the exploded structure of the embodiment of 1 The battery pack 100 of this embodiment includes a battery pack case 101 and a battery cell module 60; the battery pack case 101 is formed with a receiving cavity (not marked in the figure), and the battery cell module 60 is arranged in the receiving cavity.

The battery cell module 60 comprises at least one battery cell group. For details on the battery cell module 60 and the other components of the battery pack, please refer to the corresponding technology.

In some embodiments, as in the 1 to 8 shown is 3 a schematic representation of the structure of an embodiment of a battery pack housing of the present application. 4 is a schematic representation of the exploded structure of the embodiment of 3 . 5 is a schematic structural diagram of the shell in the embodiment of 3 . 6 is a schematic representation of the structure of the flow channel plate in the embodiment of 3 . 7 is a schematic structural diagram of a part of the structure of the embodiment of 1 . 8 is a schematic representation of the cross-sectional structure along AA in the embodiment of 7 . The battery pack case 101 of the present embodiment includes a shell 10, a flow channel plate 20 and a cover plate (not shown); the shell 10 forming a receiving cavity with an opening The flow channel plate 20 is arranged on the side of the shell 10 facing away from the receiving cavity, the flow channel plate 20 having a first recess 21 recessed in a direction away from the shell 10, the shell 10 and the first recess 21 being spaced apart and surrounding each other to form a flow channel 22 used for the flow of cooling fluid. The cover plate 30 is placed over the opening to close the receiving cavity, the shell 10 being a composite plate formed by stamping.

The receiving cavity serves to accommodate components such as the battery cell module 60. The shell 10 is a composite panel. The composite panel can be formed into a receiving cavity with an opening by a process such as stamping to form the shell 10.

On the one hand, a flow channel 22 is formed between the shell 10 and the first recess 21, so that the shell 10 is used as the upper flow channel plate of the flow channel 22, thereby eliminating the upper flow channel plate, which improves the integration of the battery pack case 101 and reduces the overall height and assembly complexity of the battery pack case 101. On the other hand, the shell 10 is a stamped composite plate, which can improve the structural strength and sealing of the shell 10, thereby improving the reliability of the battery pack 100. On the other hand, in the present application, the flow channel plate 20 is attached to the outside of the shell 10. This can reduce the impact of the coolant in the flow channel plate 20 on internal components such as the battery cell module 60, thereby further improving the reliability of the battery pack 100.

In some embodiments, the composite panel comprises at least a first aluminum layer (not shown) and a second aluminum layer (not shown); wherein the first aluminum layer and the second aluminum layer have at least partially different alloy components.

The composite plate of this embodiment is realized by an aluminum composite plate, which has good thermal conductivity and can improve the heat dissipation performance of the battery pack 100. The aluminum layer also has good ductility, heat resistance, oxidation resistance, etc., which can improve the reliability of the battery pack 100. Furthermore, the aluminum layer is lightweight, which can enhance the lightweight effect of the battery pack 100.

In some embodiments, the first aluminum layer and the second aluminum layer may be made of Series 6 aluminum and Series 3 aluminum, respectively. The shell 10 is formed by heating and stamping the mold, so that the shell 10 can achieve a specific lightweight effect while increasing the strength by more than 50% compared to the general Series 6 aluminum material. This significantly improves the safety and reliability of the battery pack 100 and its battery pack casing 101.

In addition, the shell 10 is integrally stamped and formed without welds, and the overall reliability of the airtightness of the structure is high, which can further improve the reliability of the battery pack 100.

In some embodiments, the first aluminum layer and the second aluminum layer may be alternately stacked to form a composite panel. For example, the composite panel is made of AL6016/3003/6016.

In some embodiments, a higher strength aluminum material, such as a 7-series aluminum layer, may be used to implement the first aluminum layer or the second aluminum layer to further improve the structural strength of the shell 10.

In some embodiments, the flow channel plate 20 may be made of an aluminum plate, such as a Series 3 aluminum plate, etc. The aluminum plate is attached to the shell 10 by brazing or laser welding to increase structural stability.

In some embodiments, the flow channel plate 20 is disposed on the side of the bottom wall 13 of the tray 10 facing away from the receiving cavity, and wherein the battery pack housing 101 also comprises: a bottom cover plate 40 disposed on the side of the flow channel plate 20 facing away from the bottom wall 13.

In this embodiment, the bottom cover plate 40 is arranged on the side of the flow channel plate 20 facing away from the bottom wall 13 of the shell 10 to improve the structural strength of the battery pack case 101, protect the flow channel plate 20 and the components thereon, and improve the reliability of the battery pack case 101 and the battery pack 100.

In some embodiments, the bottom cover plate 40 may comprise a high-strength steel plate that may be attached to the tray 10 with screws or an FDS connection to improve the structural strength of the battery pack housing 101 and the battery pack 100.

In some embodiments, a connection region may be provided at the edge region of the bottom cover plate 40 to be connected to the edge region of the shell 10 in order to prevent the connection between the bottom cover plate 40 and the shell 10 from affecting the flow channel plate 20.

In some embodiments, the bottom cover plate 40 may also be fixedly connected to the flow channel plate 20.

In some embodiments, the battery pack housing 101 further includes: a buffer component 50 disposed between the bottom cover plate 40 and the flow channel plate 20.

In this embodiment, a buffer component 50 is provided between the bottom cover plate 40 and the flow channel plate 20 to fill the gap between the flow channel plate 20 and the bottom cover plate 40. At the same time, it serves to distribute stress when external forces are applied, thus improving the impact resistance of the battery pack casing 101 and thus the reliability of the battery pack 100.

In some embodiments, the buffer component 50 may comprise a component with buffering capability, such as buffer foam. The buffer foam may be, for example, soft MPP-10.

In some embodiments, the shell 10 is provided with two spaced-apart first side walls 14 and two oppositely arranged second side walls 12; wherein along the thickness direction z of the flow channel plate 20, the size of the first side walls 14 is larger than the size of the second side walls 12.

The tray 10 comprises a bottom wall 13 forming a receiving cavity, two relatively spaced-apart first side walls 14, and two relatively spaced-apart second side walls 12. The first side walls 14 and the second side walls 12 are alternately connected in sequence to form an annular side wall. One end of the annular side wall is connected to the bottom wall 13, and the other end of the annular side wall is connected to the lid body. The first side wall 14, the second side wall 12, and the bottom wall 13 are integrally formed.

In this embodiment, along the thickness direction z of the flow channel plate 20, the size of the first side wall 14 is larger than the size of the second side wall 12, so that the shell 10 is arranged in a boat shape. The first side wall 14 can be provided with an external interface (not shown) of the battery pack 100, such as a high-pressure port, a low-pressure port, an expansion valve installation port, etc., and the size of the second side wall 12 is smaller than the size of the first side wall 14. Since these external interfaces do not need to be provided on the second side wall 12, the weight of the battery pack case 101 can be reduced by reducing its size.

In some embodiments, the first sidewall 14 extends away from the flow channel plate 20 along a first direction to form a first flange surface 111. The second sidewall 12 extends away from the flow channel plate 20 along a second direction to form a second flange surface 121. The size of the first flange surface 111 along the first direction is smaller than the size of the second flange surface 121 along the second direction. The first direction is parallel to the spacing direction of the two first sidewalls 14. The second direction is parallel to the spacing direction of the two second sidewalls 12.

In this embodiment, an external interface and other components are arranged on the first side wall 14. To ensure the structural strength of the shell 10 in all directions, a larger second flange surface 121 is arranged on the second side wall 12. This serves to improve the structural strength of the second side wall 12 due to the larger second flange surface 121.

The first flange surface 111 and the second flange surface 121 are each connected to the cover body.

In some embodiments, the battery pack housing 101 further includes a beam assembly 70 disposed within the receiving cavity. The beam assembly 70 divides the receiving cavity into a plurality of sub-receiving cavities. Each sub-receiving cavities is equipped with a corresponding battery cell module 60. The beam assembly 70 can improve the installation stability of the battery cell module 60 and enhance the structural strength of the battery pack housing 101.

In some embodiments, the beam assembly 70 includes at least one cross beam (not labeled in the figure) and may also include a longitudinal beam (not labeled in the figure). The cross beam is arranged corresponding to the first sidewall 14. The longitudinal beam is arranged corresponding to the second sidewall 12. The cross beams include two end cross beams and a center cross beam, and the end cross beams are arranged on the inside of the first sidewall 14.

In some embodiments, the shell 10, the beam assembly 70, and the flow channel plate 20 are all made of aluminum. The beam assembly 70 can be connected to the shell 10, for example, by FDS or arc welding. The battery cell module 60 is connected to the beam assembly 70, for example, by encapsulation with structural adhesive. The flow channel plate 20 is attached to the shell 10 by laser welding or brazing. The bottom cover plate 40 is made of high-strength steel and is attached to the lower shell 10 by bolts or FDS connection. The flow channel plate 20 can also serve as the lower flow channel plate of the reinforcing skeletal flow channel 22 of the lower shell 10, which can not only increase the overall strength of the battery pack housing 101 but also provide direction for the flow of coolant in the liquid cooling system. The shell 10 represents an upper flow channel plate of the flow channel 22 and can improve the exit of the coolant. The cover plate, the shell 10, the beam assembly 70, the flow channel plate 20 and the bottom cover plate 40 together form the battery pack housing 101, which provides structural strength and thermal management of the battery pack 100.

In some embodiments, the cover plate, the flow channel plate 20, and the shell 10 are all made of steel. Alternatively, in another embodiment, the cover plate is made of aluminum, and the flow channel plate 20 and the shell 10 are both made of steel. The cover plate is bonded or welded to the shell 10, and the flow channel plate 20 and the shell 10 are welded.

In some embodiments, the thickness of the flow channel plate 20 is defined as T ₁ and the size of the flow channel along the thickness direction z of the flow channel plate 20, ie, the height of the flow channel 22, is defined as H ₁ , and H ₁ ≤5 T ₁ .

If the height H ₁ of the flow channel 22 is too large, the first recess 21 needs to be deepened, which weakens the flow channel plate 20. If the width of the flow channel 22 and the coolant inlet pressure remain unchanged and the height H ₁ of the flow channel 22 is too large, the flow rate of the coolant in the flow channel 22 slows down, which is not conducive to heat dissipation from the battery cell. Therefore, it is helpful to set H ₁ ≤5 T ₁ to ensure that the coolant flowing through the flow channel 22 has a sufficient flow rate and a suitable flow velocity, and also to ensure that the flow channel plate 20 has sufficient structural strength. Specifically, the first recess 21 can be formed on the flow channel plate 20 by stamping.

In some embodiments, the value of H ₁ may be 0.5 T ₁ , 1.0 T ₁ , 1.5 T ₁ , 2 T ₁ , 2.5 T ₁ , 3 T ₁ , 3.5 T ₁ , 4 T ₁ , 4.5 T ₁ , 5 T ₁ , etc. Of course, the value of T ₁ is not limited to this within its range and can be set and selected according to the actual conditions.

In some embodiments, 1.5T ₁ ≤H ₁ ≤4T ₁ . The greater the height H ₁ of the flow channel 22, the greater the flow rate of the coolant in the flow channel 22 when the width of the flow channel 22 remains the same, thereby more conducive to heat exchange with the battery cell module 60. Therefore, setting 1.5T ₁ ≤H ₁ ≤4T ₁ is helpful to ensure that the coolant flowing through the flow channel 22 has a sufficient flow rate and a suitable flow velocity, and also ensures that the flow channel plate 20 has sufficiently large structural strength.

In some embodiments, the flow channel plate 20 is disposed on a side of the bottom wall 13 of the shell 10 that faces away from the receiving cavity. The flow channel plate 20 further includes a second recess 23. The second recess 23 is recessed in a direction away from the bottom wall 13. The side of the second recess 23 facing away from the bottom wall 13 is connected to the bottom protection plate 40. The second recess 23 serves to connect the flow channel plate 20 and the bottom protection plate 40, for example, by gluing or welding.

In some embodiments, the second recess 23 is formed by stamping on the flow channel plate 20.

In some embodiments, the flow channel plate 20 is arranged on the side of the bottom wall 13 of the shell 10 that faces away from the receiving cavity. The flow channel plate 20 is provided with a welding area 42 and a non-welding area (not shown). The flow channel 22 is provided in the non-welding area. The welding area 42 is welded to the bottom wall 13. The non-welding area and the bottom wall 13 are spaced and surrounded to form a plurality of gaps; wherein the thickness of the flow channel plate 20 is defined as T ₁ , along the width direction x of the flow channel plate 20, the size of the gaps is defined as L ₁ , and L ₁ ≤20 T ₁ ; and/or along the thickness direction of the flow channel plate 20, the size of the bottom wall is defined as T ₂ , and T ₂ ≤2 T ₁ .

The smaller the non-welding area, that is, the smaller the gap width L ₁ , the fewer connection defects, such as welding defects, occur between the flow channel plate 20 and the shell 10. Therefore, by setting L ₁ ≤20 T _{1 ,} the connection stability between the flow channel plate 20 and the shell 10 can be increased.

The thickness T ₂ of the bottom wall 13 of the shell 10 is less than or equal to twice the thickness T ₁ of the flow channel plate 20. Since the first recess 21 and the like must be formed on the flow channel plate 20, the flow channel plate 20 must be made thicker and the bottom wall of the shell 10 must be made thinner. This contributes to reducing the overall weight of the battery pack 100.

The non-welding region comprises at least one flow channel region 41 in which the flow channel 22 is arranged, and the intermediate space comprises at least the flow channel 22.

In some embodiments, the safety factor of the battery pack is defined as α
and the size of the flow channel is defined as H ₁ , H ₁ ≤αL ₁ , 1.2≤α < 1.5. This embodiment is advantageous for improving the reliability of the battery pack 100 by setting a safety factor.
L ₁ ≤ 20T ₁ , H ₁ ≤ αL ₁ = 20αT ₁ , for example, when α is 1.2, H ₁ ≤ 20 * 1.2T ₁ , that is, H ₁ ≤ 24T ₁ .

In some embodiments, the value of α may be 1.2, 1.3, 1.35, 1.4, 1.45, etc. Of course, the value of α within this range is not limited thereto and can be set and selected according to actual conditions.

In some embodiments, the cover plate has a thickness T ₃ , where T ₃ < 2 T ₁ . In a battery pack 100, there are three relationships between T ₁ , T _{2 ,} and T ₃ , namely T ₂ < 2T ₁ ; or T ₃ < 2 T ₁ ; or T ₂ < 2 T ₁ and T ₃ < 2 T ₁ . Since the first recess 21 must be formed on the flow channel plate 20, the flow channel plate 20 must be made thicker, and the cover plate and the bottom wall of the tray 10 must be made thinner. This contributes to reducing the overall weight of the battery pack 100.

In some embodiments, the thickness of the shell 10 may be 1.2 mm to 1.8 mm. Specifically, the thickness may be 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, etc. Of course, the thickness value within this range is not limited to this and can be adjusted and selected according to actual conditions.

In some embodiments, the shell 10 serves as the upper flow channel plate of the flow channel plate 20 and is provided with two water inlets and outlets. Coolant enters and exits through the water inlets and outlets to control the overall temperature of the battery pack 100.

In some embodiments, the flow channel plate 20 is provided with a plurality of flow channel regions 41 and a plurality of welding regions 42, and the plurality of flow channel regions 41 and the plurality of welding regions 42 are arranged crosswise to improve the connection stability between the flow channel plate 20 and the shell 10 and the thermal management performance of the shell 10.

In some embodiments, the first recess 21 and the second recess 23 are arranged parallel to each other and offset along a preset direction. In this way, along the flow direction of the coolant in the flow channel 22, both the left and right sides of the flow channel 22 can be firmly connected to the bottom wall of the bottom cover plate 40. The force on the flow channel plate 20 is more uniform, and the connection between the flow channel plate 20 and the bottom cover plate 40 is made stronger.

In some embodiments, a flow channel may be provided in the beam to improve heat transfer performance and increase the reliability of the battery pack 100. It may reduce the weight of the beam.

The flow channel can be an air channel or a coolant flow channel.

The present application also proposes a battery pack housing, which is referred to in the above specific embodiments and is not described in detail here.

The battery pack housing provided in this embodiment comprises a shell, a flow channel plate, and a cover plate; the shell forming a receiving cavity with an opening, the flow channel plate being arranged on the side of the shell facing away from the receiving cavity, the flow channel plate having a first recess recessed in a direction away from the shell, the shell and the first recess being spaced apart from each other and surrounding each other to form a flow channel used for the flow of cooling fluid; the cover plate being placed over the opening to close the receiving cavity, the shell being a composite plate formed by stamping. On the one hand, a flow channel is formed between the shell and the first recess, so that the shell is used as the upper flow channel plate of the flow channel, thereby eliminating the upper flow channel plate, which improves the integration of the battery pack housing and reduces the overall height and assembly complexity of the battery pack housing. On the other hand, the shell is a stamped composite plate, which can improve the structural strength and sealing of the shell, thereby improving the reliability of the battery pack. On the other hand, in the present application, the flow channel plate is attached to the outside of the shell. This can reduce the impact of the coolant in the flow channel plate on internal components such as the battery cell module, thereby further improving the reliability of the battery pack.

Furthermore, the shell of the present application is a boat-shaped structure. The main structure is integrally stamped and there is no welding. The overall airtightness reliability of the structure is high, and the material can be AL6016/3003/6016. This material is a composite panel made of 6-series and 3-series aluminum. It is stamped after heating in a mold. It achieves a specific lightweight effect and can increase the strength by more than 50% compared with ordinary 6-series aluminum, thereby significantly improving the overall structural safety and reliability.

In addition, due to the punching thinning rate of the flow channel plate, the flow channel height H ₁ on the flow channel plate is not greater than five times its wall thickness T ₁ , and the width L ₁ of the cavity in the welding area between the flow channel plate and the shell is usually not more than 20 times T ₁ and is generally an integer. The bottom wall thickness T ₂ of the shell does not exceed 2 times the wall thickness T ₁ of the flow channel plate, and a safety factor of 1.2 is set, and H ₁ ≤1.2*20 T ₁ , that is, H ₁ ≤24T ₁ . While meeting the design requirements of the liquid cooling system, the value of H ₁ should be as small as possible.

In addition, a buffer foam is placed between the floor cover plate and the flow channel plate, filling the gap between the flow channel plate and the floor cover plate and simultaneously playing a role in distributing stress when external forces are applied. This structure can improve overall structural safety.

The flow channel is formed by stamping the upper or lower flow channel. The flow channel is used for the coolant flow. How to ensure that the battery pack has sufficient structural strength while ensuring that the coolant has an appropriate flow rate and flow velocity in the flow channel, and how to reduce the height of the battery pack, is a problem that needs to be solved.

For this purpose, the present application further proposes a battery pack according to another embodiment as shown in the 9 until 14 shown. The battery pack 100 includes a shell 10, a flow channel plate 20, a cover plate 30, and a battery cell module. 9 is a schematic illustration of an exploded view of another embodiment of a battery pack contemplated in the present application. 10 is a schematic representation of a top view of another embodiment of a tray provided in the present application. 11 is a schematic representation of a top view of another embodiment of a flow channel plate provided in the present application. 12 is a schematic plan view of another embodiment of the battery pack provided in the present application. 13 is a schematic cross-sectional view of 12 at AA. 14 is an enlarged structural schematic diagram of 13 at B.

In particular, the flow channel plate 20 is mounted on the bottom wall of the shell 10, wherein the flow channel plate 20 has a first recess 21 which is recessed in a direction close to the bottom wall of the shell 10, wherein the cover plate 30 is placed on the side of the flow channel plate 20 facing away from the bottom wall of the shell 10, wherein the cover plate and the first Recess 21 are spaced apart from each other and surrounded to form a flow channel 22 which is used for the flow of cooling liquid, wherein the thickness of the flow channel plate 20 is T ₁ , wherein the height of the flow channel 22 along the thickness direction of the flow channel plate 20 is H ₁ and 1.5T ₁ ≤SH ₁ ≤4T ₁ . The battery cell module is installed on a side of the cover plate 30 facing away from the flow channel plate 20.

It is understandable that the greater the height _H1 of the flow channel 22, the greater the flow rate of the coolant in the flow channel 22 when the width of the flow channel 22 is the same. This promotes heat exchange with the battery cell module. However, if the height _H1 of the flow channel 22 is too large, the first recess 21 needs to be deepened, which weakens the flow channel plate 20. If the width of the flow channel 22 and the coolant inlet pressure remain unchanged and the height _H1 of the flow channel 22 is too large, the flow rate of the coolant in the flow channel 22 will be slowed down, which is not conducive to the heat dissipation of the battery cell module to the outside. Therefore, it is helpful to set 1.5 T ₁ ≤H ₁ ≤4 T ₁ to ensure that the coolant flowing through the flow channel 22 has a sufficient flow rate and a suitable flow velocity, and also to ensure that the flow channel plate 20 has sufficient structural strength. Specifically, the first recess 21 can be formed on the flow channel plate 20 by punching.

Furthermore, the cover plate 30 surrounds a side of the flow channel plate 20 facing away from the bottom wall of the shell 10 to form the flow channel 22, so that the cover plate 30 is arranged as the upper flow channel plate of the flow channel 22, thereby eliminating the upper flow channel plate and improving the integration of the battery pack 100. The overall height and assembly complexity of the battery pack 100 are reduced.

Preferably, the value of H ₁ is 1.5 T ₁ , 2 T ₁ , 2.5 T ₁ , 3 T ₁ , 3.5 T ₁ , 4 T ₁ , etc. Of course, the value of H ₁ is not limited to this within its range and can be set and selected according to the actual conditions.

The thickness of the bottom wall of the tray 10 is T ₂ and the thickness of the cover plate 30 is T ₃ , where T ₂ < T ₁ ; and/or T ₃ < T ₁ . In a battery pack 100, there are three relationships between T ₁ , T _{2 ,} and T ₃ , namely T ₂ < T ₁ ; or T ₃ < T ₁ ; or T ₂ < T ₁ and T ₃ < T ₁ . Since the first recess 21 must be formed on the flow channel plate 20, the flow channel plate 20 must be made thicker, and the cover plate 30 and the bottom wall of the tray 10 must be made thinner. This contributes to reducing the overall weight of the battery pack 100. In some embodiments, the cover plate 30, the flow channel plate 20 and the shell 10 are all made of steel and the cover plate 30 and the flow channel plate 20 are welded, wherein the flow channel plate 20 and the shell 10 are welded, or in another embodiment, wherein

The cover plate 30 is made of aluminum, and the flow channel plate 20 and the shell 10 are made of steel, the cover plate 30 being glued to the flow channel plate 20, and the flow channel plate 20 and the shell 10 being welded together. In this way, the cover plate 30, the flow channel plate 20, and the shell 10 can be joined into a single unit without connectors, which not only facilitates assembly but also saves space in the battery pack. This leaves more room for the installation of additional components.

Please note 13 and 14 . The flow channel plate 20 also has a second recess 23 recessed in a direction close to the bottom wall of the shell 10, and one side of the second recess 23 is connected to the bottom wall of the shell 10, the other side of the second recess and the cover plate 30 being spaced apart and surrounding each other to form a cavity structure 24; wherein, along the thickness direction of the flow channel plate 20, the height of the cavity structure 24 is H ₂ , and H ₁ < 4T ₁ < H ₂ . It is understood that the second recess 23 serves to provide support between the shell 10 and the cover plate 30. The higher the height H ₂ of the cavity structure 24, the greater the distance between the cover plate 30 and the flow channel plate 20, so that there is sufficient space between the cover plate 30 and the flow channel plate 20 to accommodate flow channels 22 with different specifications. Therefore, by setting H ₁ ≤4 T ₁ < H ₂ , the flow channels 22 of different specifications can be conveniently accommodated between the cover plate 30 and the flow channel plate 20. Specifically, the second recess 23 is formed by punching on the flow channel plate 20.

In some embodiments, as in 14 As shown, the thickness of the bottom wall of the shell 10 is T ₂ and the thickness of the cover plate 30 is T ₃ , where T ₂ < T ₁ and T ₃ < T ₁ . The distance between the two opposite sides of the cover plate 30 and the bottom wall of the shell 10 is L and The safety factor of the battery pack is defined as α, where L > 7αT ₁ . The distance L between the two opposite sides of the cover plate 30 and the bottom wall of the shell 10 refers to the thickness of the shell 10, the flow channel plate 20, and the cover plate 30 after assembly. L = H ₂ + T ₁ + T ₂ + T ₃ . By combining T ₂ < T ₁ , T ₃ < T ₁ , and 4T ₁ < H ₂ , we know that L > 7T ₁ . In addition, setting a safety factor can help improve the reliability of the battery pack structure.

In some embodiments, 1.2≤α<1.5. For example, the value of α may be 1.2, 1.3, 1.35, 1.4, 1.45, etc. Of course, the value of α is not limited within this range and can be adjusted and selected according to actual conditions.

In some embodiments, as in 11 and 14 As shown, the first recess 21 and the second recess 23 are arranged parallel to each other and offset along a preset direction. In this way, along the flow direction of the coolant in the flow channel 22, both the left and right sides of the flow channel 22 can be firmly connected to the bottom wall of the shell 10. The force on the flow channel plate 20 becomes more uniform, and the connection between the flow channel plate 20 and the shell 10 is made stronger.

For example, the first recess 21 and the second recess 23 are arranged parallel to each other and offset along the width direction of the shell 10.

In some embodiments, as in 9 As shown, the flow channel plate 20 includes a main board 25 and a flange 26. The flange 26 is disposed around the main board 25, and the flange 26 is connected to the side wall of the shell 10. The flange 26 serves to increase the connection area between the flow channel plate 20 and the shell 10, thereby improving the strength of the connection between the flow channel plate 20 and the shell 10. The first groove 21 and the second recess 23 are both formed on the main board 25.

As in 12 As shown, the cover plate 30 is further provided with a water inlet 31 and a water outlet 32, each connected to the flow channel 22, for allowing the coolant to flow into the flow channel 22 or allowing the coolant to flow out of the flow channel 22.

In some embodiments, the area of the side of the cover plate 30 used to mount the battery cell module is S ₁ , the actual contact area between the battery cell module and the flow channel plate 20 is S ₂ , and the projected area of the flow channel plate 20 at the bottom wall of the tray is S ₃ , and S ₂ < S ₁ < S ₃ . That is, S ₂ / S ₃ < S ₁ / S ₃ < 1, so that the flow channel plate 20 can provide a sufficiently large installation area for the cover plate 30, and the cover plate 30 can provide a sufficiently large installation area for the battery cell module. Furthermore, it should be understood that after determining the battery pack capacity, the size of the battery cell module and the projected area of the flow channel plate 20 at the bottom wall of the tray 10 are constant values, that is, S ₂ / S ₃ are constant values. If S ₂ / S ₃ < S ₁ / S ₃ < 1 is maintained, the smaller the value of S ₁ / S ₃ is, the smaller the cover plate 30 is, which has a positive effect on the low weight of the battery pack 100.

The present application also proposes a vehicle including the above-mentioned battery pack, which, however, is not described in detail here.

The above description is merely an implementation method of the present application and does not limit the scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or applied directly or indirectly in other related technical fields, also falls within the scope of this application.

QUOTES CONTAINED IN THE DESCRIPTION

This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• CN 2024211514563 [0001]

Claims (19)

A battery pack housing, the battery pack housing comprising: a shell forming a receiving cavity having an opening; a flow channel plate disposed on a side of the shell facing away from the receiving cavity, the flow channel plate having a first recess recessed in a direction away from the shell, the shell and the first recess being spaced apart from each other and surrounding each other to form a flow channel used for the flow of cooling fluid; a cover plate placed over the opening to close the receiving cavity, wherein the shell is a stamped composite plate. Battery pack housing according to Claim 1 , wherein the composite panel comprises at least a first aluminum layer and a second aluminum layer; wherein the first aluminum layer and the second aluminum layer have at least partially different alloy components. Battery pack housing according to Claim 1 , wherein the flow channel plate is arranged on a side of the bottom wall of the shell facing away from the receiving cavity, and wherein the battery pack housing also comprises: a bottom cover plate arranged on a side of the flow channel plate facing away from the bottom wall. Battery pack housing according to Claim 3 , wherein the battery pack housing also includes a buffer component disposed between the bottom cover plate and the flow channel plate. Battery pack housing according to Claim 1 , wherein the shell is provided with two spaced-apart first side walls and two oppositely arranged second side walls; wherein along the thickness direction of the flow channel plate, the size of the first side walls is larger than the size of the second side walls. Battery pack housing according to one of the Claims 1 until 5 , wherein the flow channel plate is arranged on a side of the bottom wall of the shell facing away from the receiving cavity; wherein the flow channel plate has a weld zone and a non-weld zone, wherein the flow channel is arranged in the non-weld zone and the weld zone is welded to the bottom wall; wherein the non-weld zone and the bottom wall are arranged at a distance from one another and surround one another to form a plurality of gaps; wherein the thickness of the flow channel plate is defined as T ₁ , wherein along the width direction of the flow channel plate the size of the gaps is defined as L ₁ , and L ₁ ≤20 T ₁ ; and/or along the thickness direction of the flow channel plate the size of the bottom wall is defined as T ₂ , and T ₂ ≤2 T ₁ . Battery pack housing according to Claim 6 , where the safety factor of the battery pack casing is defined as α, along the thickness direction of the flow channel plate, the size of the flow channel is defined as H ₁ , H ₁ ≤αL ₁ , 1.2≤α < 1.5. Battery pack housing according to one of the Claims 1 until 5 , where the thickness of the flow channel plate is defined as T ₁ , where along the thickness direction of the flow channel plate the size of the flow channel is defined as H ₁ , and H ₁ ≤5T ₁ . A battery pack, the battery pack comprising: a battery pack housing according to one of the Claims 1 until 8 ; a battery cell module disposed in the receiving cavity. A battery pack, the battery pack comprising a tray, a flow channel plate and a cover plate, the flow channel plate being mounted on the bottom wall of the tray, the flow channel plate having a first recess recessed in a direction close to the bottom wall of the tray, the cover plate being placed on a side of the flow channel plate facing away from the bottom wall of the tray, the cover plate and the first recess being spaced apart from each other and surrounding each other to form a flow channel used for the flow of cooling liquid, the thickness of the flow channel plate being T ₁ , the height of the flow channel being H ₁ along the thickness direction of the flow channel plate and 1.5T ₁ ≤H ₁ ≤4T ₁ . Battery pack after Claim 10 , wherein the thickness of the bottom wall of the shell is T ₂ and the thickness of the cover plate is T ₃ , where T ₂ < T ₁ ; and/or T ₃ < T ₁ . Battery pack after Claim 10 , wherein the flow channel plate also has a second recess recessed in a direction close to the bottom wall of the shell, and wherein one side of the second recess is connected to the bottom wall of the shell, the other side of the second recess and the cover plate being spaced apart from each other and surrounding a to form a cavity structure; wherein along the thickness direction of the flow channel plate, the height of the cavity structure is H ₂ , and H ₁ ≤4T ₁ < H ₂ . Battery pack after Claim 12 ,wherein the thickness of the bottom wall of the shell is T ₂ and the thickness of the cover plate is T ₃ , where T ₂ < T ₁ and T ₃ < T ₁ , where the distance between the two opposite sides of the cover plate and the bottom wall of the shell is L, where the safety factor of the battery pack is defined as α, where L > 7αT ₁ Battery pack after Claim 13 , where 1.2≤α < 1.5. Battery pack after Claim 12 , wherein the first recess and the second recess are arranged parallel to each other and offset along a predetermined direction. Battery pack after Claim 10 , wherein the battery pack also comprises a battery cell module, wherein the battery cell module is mounted on a side of the cover plate facing away from the flow channel plate, wherein the area of the side of the cover plate used for mounting the battery cell module is S ₁ , wherein the actual contact area between the battery cell module and the flow channel plate is S ₂ , and wherein the projected area of the flow channel plate on the bottom wall of the shell is S ₃ , and S ₂ < S ₁ < S ₃ . Battery pack after Claim 10 , wherein the flow channel plate comprises a main board and a flange, the flange being arranged around the circumference of the main board and the flange being connected to a side wall of the shell. Battery pack after Claim 10 , wherein the cover plate, the flow channel plate and the shell are all made of steel, and wherein the cover plate and the flow channel plate are welded, wherein the flow channel plate and the shell are welded, or wherein the cover plate is made of aluminum, and wherein the flow channel plate and the shell are made of steel, and wherein the cover plate is glued to the flow channel plate, and wherein the flow channel plate and the shell are welded together. A vehicle, whereby the vehicle carries the battery pack after Claim 9 or the battery pack according to one of the Claims 10 until 18 includes.