Battery pack housing, battery pack and automotive

Abstract

This description describes a battery pack housing, a battery pack, and an automobile. The battery pack housing comprises: a tray (10), configured with a receiving cavity having an opening; a flow channel plate (20), disposed on one side of the tray (10) opposite the receiving cavity, in which the flow channel plate (20) is configured with a first hollow portion (21), the first hollow portion (21) is hollowed in a direction opposite to the tray (10), the tray (10) and the first hollow portion (21) are spaced apart and arranged surrounding each other to form a flow channel (22), and the flow channel (22) is used for the flow of a coolant; and a cover plate (30), covering the opening to close the receiving cavity, in which the tray (10) is a composite plate formed by stamping. [Fig. 1]

Description

Title of the invention: Battery pack casing body, battery pack and automobile. Technical field

[0001] The present description relates to the technical field of batteries, and in particular a battery pack housing, a battery pack and an automobile.

[0002] CONTEXT

[0003] A battery pack provides direct power to a new energy vehicle, and the battery pack generally comprises a tray, a battery cell module, and a cold plate. The cold plate is formed by an upper flow channel plate and a lower flow channel plate in an enclosed manner; the cold plate is fixed within a battery pack casing; and the battery cell module is bonded to the flow channel plates by adhesive, thereby enabling the functions of fixing, cooling, and heating the battery cell module; and a flow channel is formed by stamping on the upper flow channel plate and / or on the lower flow channel plate, and the flow channel is used for the flow of a coolant.

[0004] In the related technique, the upper flow channel plate and the lower flow channel plate are first welded together to form a single unit, and then connected in the battery pack housing body by bolts or rivets, so that the assembly is complex, and the total height of the battery pack is relatively large.

[0005] SUMMARY

[0006] The present description relates to a battery pack housing body, a battery pack and an automobile, in order to reduce the overall height of the battery pack housing body and the battery pack, and to improve the reliability of the battery pack.

[0007] In order to resolve the above technical problems, the present description relates to a battery pack housing comprising: a tray, configured with a housing cavity having an opening; a flow channel plate, disposed on one side of the tray opposite the housing cavity, wherein the flow channel plate is configured with a first hollowed portion, the first hollowed portion being hollowed in a direction opposite to the tray, the tray and the first hollowed portion being spaced apart and arranged surrounding each other to form a flow channel, and the flow channel is used for the flow of a coolant; and a cover plate, covering the opening for close the receiving cavity, in which the tray is a composite plate formed by stamping.

[0008] In some embodiments, the composite plate comprises at least a first layer of aluminum and a second layer of aluminum, in which the first layer of aluminum and the second layer of aluminum have different alloy components, at least in part.

[0009] In some embodiments, the flow channel plate is disposed on one side of a bottom wall of the tray opposite the receiving cavity, and the battery pack housing body further comprises: a bottom protection plate, disposed on one side of the flow channel plate opposite the bottom wall.

[0010] In certain embodiments, the battery pack housing body further comprises a buffer element, disposed between the bottom protection plate and the flow channel plate.

[0011] In some embodiments, the platform is configured with two first side walls arranged opposite each other and spaced apart, and two second side walls arranged opposite each other; and in one direction of the thickness of the flow channel plate, a size of a first side wall is greater than a size of a second side wall.

[0012] In certain embodiments, the flow channel plate is disposed on one side of a bottom wall of the tray opposite the receiving cavity; the flow channel plate is configured with a welded region and a non-welded region, the flow channel is disposed in the non-welded region, and the welded region is welded to the bottom wall; the non-welded region and the bottom wall are spaced apart and arranged surrounding each other to form a plurality of spacing regions; a thickness of the flow channel plate is defined by T1; in one direction of the width of the flow channel plate, a size of a spacing region is defined by Lp and Lj < 20 Tj; and / or, in one direction of the thickness of the flow channel plate, a size of the bottom wall is defined by T2, and T2 < 2 Tp

[0013] In some embodiments, a safety factor of a battery pack is defined by a, in a direction of the thickness of the flow channel plate, a size of the flow channel is defined by Hp Hx < aL^ and 1.2 < a < 1.5.

[0014] In certain embodiments, a thickness of the flow channel plate is defined by Tp in one direction of the flow channel plate thickness, a size of the flow channel is defined by Hp and < 5 Tp

[0015] The present description relates to a battery pack, comprising: the battery pack housing body mentioned above; and a battery cell module, disposed in the housing cavity.

[0016] This description relates to a battery pack comprising a tray, a flow channel plate, and a cover plate, wherein the flow channel plate is mounted on a bottom wall of the tray. The flow channel plate is configured with a first hollowed portion, the first hollowed portion being hollowed in a direction close to the bottom wall of the tray. The cover plate covers one side of the flow channel plate opposite the bottom wall of the tray. The cover plate and the first hollowed portion are spaced apart and arranged surrounding each other to form a flow channel. The flow channel is used for the flow of a coolant. The thickness of the flow channel plate is Tp in one direction of the thickness of the flow channel plate, and the height of the flow channel is 1.5Tp < 4Tp.

[0017] In certain embodiments, the thickness of the bottom wall of the tray is T2, and the thickness of the cover plate is T3, where T2 < ; and / or T3 < Tr

[0018] In some embodiments, the flow channel plate is further configured with a second hollowed part, the second hollowed part is hollowed in the direction near the bottom wall of the tray, one side of the second hollowed part is connected to the bottom wall of the tray, and the other side of the second hollowed part and the cover plate are spaced apart and arranged surrounding each other to form a hollow cavity structure, in which, in the direction of the thickness of the flow channel plate, a height of the hollow cavity structure is H2, and Hj < 4Tx < H2.

[0019] In certain embodiments, the thickness of the base wall of the platter is T2, and the thickness of the cover plate is T3, where T2 < T and T3 < Tp. A distance between two lateral faces, which are opposite each other, of the cover plate and the base wall of the platter is L. A safety factor for the battery pack is defined by a, and L > 7aTp

[0020] In some embodiments, 1.2 < a < 1.5.

[0021] In some embodiments, the first hollowed-out part and the second part hollowed-out sections are arranged parallel to each other and are staggered in a predefined direction.

[0022] In some embodiments, the battery pack further comprises a battery cell module, and the battery cell module is mounted on one side of the cover plate opposite the flow channel plate, in which an area of ​​a lateral face of the cover plate for mounting the battery cell module is Sh, an actual contact area between the battery cell module and the flow channel plate is S2, an area of ​​projection of the flow channel plate onto the bottom wall of the tray is S3, and S2 < $i < S3.

[0023] In some embodiments, the flow channel plate comprises a main plate and a flange, the flange is arranged on a periphery of the main plate in an enclosing manner, and the flange is connected to a side wall of the plate.

[0024] In some embodiments, the cover plate, the flow channel plate and the tray are all made of steel, the cover plate is welded to the flow channel plate, and the flow channel plate is welded to the tray; or, the cover plate is made of aluminum, the flow channel plate and the tray are both made of steel, the cover plate is glued to the flow channel plate, and the flow channel plate is welded to the tray.

[0025] This description relates to an automobile, comprising the battery pack mentioned above.

[0026] The technical solutions of this description have the following beneficial effects: the battery pack housing body supplied in this description comprises a tray, a flow channel plate and a cover plate, in which the tray is configured with a receiving cavity having an opening; the flow channel plate is disposed on the side of the tray opposite the receiving cavity, the flow channel plate is configured with a first hollowed portion, the first hollowed portion is hollowed in a direction opposite to the tray, the tray and the first hollowed portion are spaced apart and are arranged surrounding each other to form a flow channel, and the flow channel is used for the flow of a coolant; the cover plate covers the opening to close the receiving cavity; and the tray is a composite plate formed by stamping.

[0027] According to one aspect, the tray and the first hollowed portion are arranged surrounding each other to form the flow channel, such that the tray is positioned as the upper flow channel plate, thereby saving the upper flow channel plate, which improves the level of integration of the battery pack enclosure body and reduces the overall height and assembly complexity of the battery pack enclosure body; according to another aspect, since the tray is a composite plate formed by stamping, the structural strength and sealing performance of the trays can be improved, and the reliability of the battery pack is thus improved; and in yet another aspect, the flow channel plate is disposed outside the tray in the present description, so that the influence of the coolant inside the flow channel plate on internal elements, such as the battery pack cell module, can be reduced, thereby further improving the reliability of the battery pack. Brief description of the drawings

[0028] In order to illustrate more clearly the technical solutions in the embodiments of this description, a brief presentation of the drawings necessary for describing the embodiments is given below. Apparently, the drawings in the description below are only some of the embodiments of this description, on the basis of which other drawings can be obtained by a person skilled in the art without any creative effort, in which:

[0029] [Fig.1] illustrates a structural diagram of an embodiment of a battery pack in the present description;

[0030] [Fig.2] illustrates a diagram of an exploded view of the embodiment of [Fig.1];

[0031] Figure 3 illustrates a structural diagram of an embodiment of a body of battery pack enclosure in this description;

[0032] [Fig.4] illustrates a diagram of an exploded view of the embodiment of [Fig.3];

[0033] Figure 5 illustrates a structural diagram of a tray in the embodiment of the [Fig.3];

[0034] Figure 6 illustrates a structural diagram of a flow channel plate in the method of implementation of [Fig.3];

[0035] [Fig.7] illustrates a structural diagram of a partial structure of the embodiment of [Fig.1];

[0036] Figure 8 illustrates a diagram of a structure in cross-section along AA in the embodiment of [Fig.7];

[0037] [Fig.9] illustrates a diagram of an exploded view of another embodiment of a battery pack supplied in this description;

[0038] Figure 10 illustrates a schematic top view of another embodiment of a tray provided in this description;

[0039] [Fig.1 1] illustrates a schematic top view of another embodiment of a flow channel plate supplied in this description;

[0040] Figure 12 illustrates a schematic top view of another embodiment of a battery pack supplied in this description;

[0041] [Fig. 13] illustrates a cross-sectional view of [Fig. 12] along AA; and

[0042] [Fig. 14] illustrates a diagram of an enlarged structure of [Fig. 13] in B.

[0043] DETAILED DESCRIPTION OF THE EMBODIMENT METHODS

[0044] This description will be described in more detail below in conjunction with the drawings and embodiments. It should be emphasized that the following embodiments serve only to illustrate this description, but do not limit its scope. Similarly, the following embodiments are only some, but not all, of the embodiments of this description, and all other embodiments obtained by persons skilled in the art without creative effort fall within the scope of this description.

[0045] In describing embodiments of this description, it should be noted that, unless expressly specified or limited, the terms "connected" and "linkage" are to be understood in a broad sense; for example, a linkage may be a fixed link, and may also be a detachable or integral linkage; it may be a mechanical link, and may also be an electrical linkage; and it may be a direct link, and may also be an indirect link via an intermediate support. For those skilled in the art, the specific meanings of the above terms in embodiments of this description can be understood in specific situations.

[0046] In the embodiments of this description, unless expressly specified or limited, a first feature being "on" or "under" a second feature may mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature via an intermediate support. Furthermore, the fact that the first feature is "over," "above," and "on" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply indicates that a horizontal height of the first feature is greater than that of the second feature.The fact that the first feature is "under", "below", and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply indicates that the horizontal height of the first feature is less than that of the second feature.

[0047] In this description, references to the expressions "an embodiment", "certain embodiments", "examples", "specific examples" or "certain examples" are intended to indicate that specific features, structures, materials or particularities described in combination with the embodiment or example are included in at least one embodiment or example of the embodiments. implementation of this description. In this specification, the schematic representations of the above expressions do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any appropriate way in one or more embodiments or examples. Moreover, different embodiments or examples described in this specification and the features of different embodiments or examples can be combined and assembled by those skilled in the art without contradiction.

[0048] In the related technique, a battery pack housing and a drain channel plate are generally two types of parts, and the two parts must be assembled and integrated together by a large number of fasteners during use. In order to reserve mounting space for the drain channel plate, part of the vertical space of a battery pack is generally occupied, resulting in a loss of space. The drain channel plate is generally divided into an upper drain channel plate and a lower drain channel plate, which are joined into a single unit by brazing and then attached to the battery pack housing by bolts or rivets.However, the battery pack housing of this structure presents the following problems: complex assembly process, high height of the battery pack, low structural strength and easy influence of coolant on internal battery pack components.

[0049] To this end, the present description relates to a battery pack housing body and a battery pack, in which the battery pack housing body and the flow channel plate are designed as a whole, so that the complexity of an assembly process of the battery pack housing body and the flow channel plate can be reduced, and that a mounting space (approximately 10 mm can be gained) required by the flow channel plate in one height direction of the battery pack can be gained, thus reserving more space for other parts (for example, a high-capacity battery pack cell with a larger size can be selected to increase endurance mileage).In this description, a top flow channel plate is omitted, and a tray serves as a support for a battery pack cell module and internal devices at the same time, and functions as a top flow channel plate; and furthermore, in the event of an abnormal leak of coolant into the battery pack, the coolant does not flow into the battery pack and does not cause a short circuit or corrosion.

[0050] The present description first provides a battery pack, as shown in [Fig. 1] and [Fig. 2]. [Fig. 1] is a structural diagram of one embodiment of a battery pack in this description, and [Fig.2] is a diagram of an exploded view of the embodiment of [Fig.1]. In this embodiment, the battery pack 100 comprises a battery pack housing body 101 and a battery cell module 60, in which a housing cavity (not shown) is formed in the battery pack housing body 101, and the central battery module 60 is disposed in the housing cavity.

[0051] The battery cell module 60 comprises at least one group of battery cells. Reference may be made to the related technique for the battery cell module 60 and other components of the battery pack.

[0052] In certain embodiments, as shown in Figures 1 to 8, [Fig.3] is a structural diagram of an embodiment of a battery pack housing body in the present description; [Fig.4] is an exploded view diagram of the embodiment of [Fig.3]; [Fig.5] is a structural diagram of a tray in the embodiment of [Fig.3]; [Fig.6] is a structural diagram of a flow channel plate in the embodiment of [Fig.3]; [Fig.7] is a structural diagram of a partial structure of the embodiment of [Fig.1]; and [Fig.8] is a diagram of a cross-sectional structure along AA in the embodiment of [Fig.7].In this embodiment, the battery pack housing body 101 comprises a tray 10, a flow channel plate 20 and a cover plate (not shown), wherein the tray 10 is configured with a receiving cavity having an opening; the flow channel plate 20 is disposed on one side of the tray 10 opposite the receiving cavity, the flow channel plate 20 is configured with a first hollowed portion 21, the first hollowed portion 21 is hollowed in a direction opposite to the tray 10, the tray 10 and the first hollowed portion 21 are spaced apart and are arranged surrounding each other to form a flow channel 22, and the flow channel 22 is used for the flow of a coolant; the cover plate 30 covers the opening to close the receiving cavity; and the tray 10 is a composite plate formed by stamping. .

[0053] The housing cavity is used to place components such as the battery cell module 60. The tray 10 is a composite plate, and a housing cavity having an opening can be formed in the composite plate by processes such as stamping, so as to form the tray 10.

[0054] According to one aspect, the tray 10 and the first hollowed part 20 are arranged surrounding each other to form the flow channel 20, so that the tray 10 is arranged as the upper plate of the flow channel of the flow channel 22, in order to save the upper plate of the flow channel, which improves the level of integration of the battery pack housing body 10, and to reduce the overall height and assembly complexity of the battery pack housing 101. Furthermore, since the tray 10 is a stamped composite plate, its structural strength and sealing performance can be improved, thereby enhancing the reliability of the battery pack 100. Additionally, the flow channel plate 20 is located outside the tray 10 in this embodiment, thus reducing the influence of the coolant inside the flow channel plate 20 on internal components, such as the battery pack cell module 60, thereby further improving the reliability of the battery pack 100.

[0055] In some embodiments, the composite plate comprises at least a first layer of aluminium (not shown) and a second layer of aluminium (not shown), in which the first layer of aluminium and the second layer of aluminium have different alloy components, at least in part.

[0056] In the present embodiment, the composite plate is made of an aluminum composite plate, which consequently has relatively good thermal conductivity, and the heat dissipation performance of the battery pack 100 can therefore be improved; moreover, the aluminum layer also exhibits good ductility, good heat resistance, good oxidation resistance, and similar properties, so that the reliability of the battery pack 100 can be improved. Furthermore, the weight of the aluminum layer is low, so the overall lightness of the battery pack 100 can be enhanced.

[0057] In some embodiments, the first aluminum layer and the second aluminum layer can be made respectively from 6 series aluminum and 3 series aluminum, heating and stamping are carried out by means of a mold to form the tray 10, so that the tray 10 has a lightweight effect, and at the same time, compared with common 6 series aluminum-based materials, the strength can be improved by more than 50%, which greatly improves the safety and reliability of the battery pack 100 and the battery pack housing body 101.

[0058] In addition, the tray 10 is formed in one piece by stamping and therefore has no weld joint, so that the overall reliability of the sealing of the structure is relatively high and the reliability of the battery pack 100 can be further improved.

[0059] In some embodiments, the first aluminum layer and the second aluminum layer can be stacked alternately to form the composite plate, for example, the composite plate is made of AL6016 / 3003 / 6016.

[0060] In certain embodiments, the first or second aluminum layer can be implemented using a material based of stronger aluminum, such as a layer of 7 series aluminum, in order to further improve the structural strength of the 10 plate.

[0061] In some embodiments, the flow channel plate 20 may be an aluminum plate, such as a series 3 aluminum plate or similar, and the aluminum plate is fixed to the tray 10 by brazing or laser welding, or similar, in order to increase structural stability.

[0062] In some embodiments, the flow channel plate 20 is disposed on one side of a bottom wall 13 of the tray 10 opposite the receiving cavity, and the battery pack housing body 101 further comprises: a bottom protection plate 40, disposed on the side of the flow channel plate 20 opposite the bottom wall 13.

[0063] In the present embodiment, the bottom protection plate 40 is arranged on the side of the flow channel plate 20 opposite the bottom wall 13 of the tray 10, so as to improve the structural resistance of the battery pack housing body 101, and to protect the flow channel plate 20 and components on it in order to improve the reliability of the battery pack housing body 101 and the battery pack 100.

[0064] In some embodiments, the bottom protection plate 40 may include a high-strength steel plate, which may be fixed to the tray 10 by bolts or an FDS connection or other means, in order to improve the structural strength of the battery pack housing body 101 and the battery pack 100.

[0065] In some embodiments, a peripheral region of the bottom protection plate 40 can be configured with a linking region, which is connected to the peripheral region of the tray 10 to prevent the influence of a link between the bottom protection plate 40 and the tray 10 on the flow channel plate 20.

[0066] In some embodiments, the bottom protection plate 40 can also be permanently connected to the flow channel plate 20.

[0067] In some embodiments, the battery pack housing body 101 further comprises a buffer element 50, disposed between the bottom protection plate 40 and the flow channel plate 20.

[0068] In the present embodiment, the buffer element 50 is disposed between the bottom protection plate 40 and the flow channel plate 20 to fill a space between the flow channel plate 20 and the bottom protection plate 40, and meanwhile play a role in dispersing stresses when subjected to an external force, so as to improve the shock resistance of the battery pack casing body 101, thereby improving the reliability of the battery pack 100.

[0069] In some embodiments, the buffering element 50 may include a component having buffering capacity, such as a buffering foam; and the buffering foam may be, for example, flexible MPP-10 or similar.

[0070] In some embodiments, the tray 10 is configured with two first side walls 14 arranged opposite each other and spaced apart, and two second side walls 12 arranged opposite each other; and in the direction of the thickness z of the flow channel plate 20, the size of the first side wall 14 is greater than the size of the second side wall 12.

[0071] The platform 10 includes the bottom wall 13 to form the receiving cavity, the first two side walls 14 arranged opposite and at a distance from each other, and the second two side walls 12 arranged opposite and at a distance from each other, the first side walls 14 and the second side walls 12 are alternately connected in sequence to form an annular side wall, one end part of the annular side wall is connected to the bottom wall 13, and the other end of the annular side wall is connected to a covering body; and the first side walls 14, the second side walls 12 and the bottom wall 13 are formed as a single unit.

[0072] In the present embodiment, in the direction of the thickness z of the flow channel plate 20, the size of the first side wall 14 is greater than the size of the second side wall 12, so that the tray 10 is arranged in the shape of a boat, an external interface (not shown) of the battery pack 100, such as a high voltage port, a low voltage port, an expansion valve mounting port and the like, can be disposed on the first side wall 14, and as the size of the second side wall 12 is smaller than the size of the first side wall 14, it is not necessary to provide these external interfaces on the second side wall 12, so that the weight of the battery pack casing body 101 can be reduced by reducing the size of the second side wall 12.

[0073] In some embodiments, a first flange face 111 extends from the first side wall 14 in a first direction opposite to the flow channel plate 20, and a second flange face 121 extends from the second side wall 12 in a second direction opposite to the flow channel plate 20; the size of the first flange face 111 in the first direction is less than the size of the second flange face 121 in the second direction; and the first direction is parallel to a spacing direction of the first two side walls 14, and the second direction is parallel to a spacing direction of the second two side walls 12.

[0074] In the present embodiment, components, such as the external interface, are arranged on the first side wall 14, and in order to ensure resistance structural in each orientation of the plate 10, the second flange face 121 having a larger size is disposed on the second side wall 12, so that the structural resistance of the second side wall 12 is improved by the second flange face 121 having a larger size.

[0075] The first flange face 111 and the second flange face 121 are respectively connected to the cover body.

[0076] In certain embodiments, the battery pack housing 101 further comprises a set of bars 70 arranged in the housing cavity. The housing cavity is divided into a plurality of housing sub-spaces by the set of bars 70, and a corresponding battery cell module 60 is respectively arranged in each housing sub-space. The set of bars 70 can improve the installation stability of the battery cell module 60 and can improve the structural strength of the battery pack housing 101.

[0077] In some embodiments, the bar assembly 70 comprises at least one crossbar (not shown), and may further comprise a longitudinal bar (not shown), the crossbar is arranged in correspondence with the first side wall 14, and the longitudinal bar is arranged in correspondence with the second side wall 12, in which the crossbar comprises two end part crossbars and a central crossbar, and the end part crossbars are arranged on an internal side of the first side wall 14.

[0078] In some embodiments, the tray 10, the bar assembly 70 and the flow channel plate 20 are all made of aluminum-based materials; the bar assembly 70 can be connected to the tray 10, for example by FDS or by arc welding; the central battery module 60 and the bar assembly 70 are connected, for example, by a structural adhesive encapsulation; the flow channel plate 20 is attached to the tray 10, for example by laser welding or brazing; and the bottom protection plate 40 is made of high-strength steel, and is attached to the tray 10, for example, by a bolt or an FDS connection.The flow channel plate 20 can simultaneously serve as the lower flow channel plate for the reinforcing skeleton flow channel 22 of the tray 10. This not only increases the overall strength of the battery pack enclosure 101 but also provides guidance for the flow of coolant in a liquid cooling system. Since the tray 10 acts as the upper flow channel plate 22, coolant leakage can be controlled. The cover plate, tray 10, bar assembly 70, flow channel plate 20, and bottom protection plate 40 form the assembly. together the battery pack casing body 101, thereby providing support for the structural strength and thermal management of the battery pack 100.

[0079] In some embodiments, the cover plate, the flow channel plate 20, and the tray 10 are all made of steel. Alternatively, in another embodiment, the cover plate is made of aluminum, the flow channel plate 20 and the tray 10 are both made of steel, the cover plate is bonded to or welded to the tray 10, and the flow channel plate 20 is welded to the tray 10.

[0080] In certain embodiments, the thickness of the flow channel plate 20 is defined by Tp in the direction of the thickness z of the flow channel plate 20, the size of the flow channel, namely, the height of the flow channel 22, is defined by Hp and < 5Tp

[0081] If the height of the flow channel 22 is too great, the depth of the first recessed portion 21 must be greater, so that the flow channel plate 20 is weaker; and in the case of the same width of the flow channel 22 and the same coolant inlet pressure, if the height of the flow channel 22 is too great, the flow velocity of the coolant in the flow channel 22 is slowed, which is not conducive to heat dissipation from a battery cell. Thus, setting Hx < 5T not only ensures that the coolant flowing in the flow channel 22 has a sufficient flow rate and an appropriate flow velocity, but also allows the flow channel plate 20 to have sufficiently high structural strength.Specifically, the first hollowed-out part 21 can be machined onto the flow channel plate 20 by press forming.

[0082] In certain embodiments, the value of can be 0.5 Tp, 1.0 Tp, 1.5 Tp, 2 Tp, 2.5 Tp, 3 Tp, 3.5 Tp, 4 Tp, 4.5 Tp, 5 Tp, etc. Of course, within the associated range, the value of Tp is not limited to this and can be defined and selected according to real-life situations.

[0083] In certain embodiments, 1.5 Tj < Hj < 4 Tp. The greater the height of the flow channel 22, the higher the flow rate of the coolant in the flow channel 22, assuming an identical width of the flow channel 22. This is more conducive to heat exchange with the battery cell module 60. Therefore, setting 1.5 Tj < Hj < 4 Tp allows for... not only to ensure that the coolant flowing in the flow channel 22 has a sufficient flow rate and appropriate flow velocity, but also to allow the flow channel plate 20 to have a sufficiently high structural resistance.

[0084] In some embodiments, the flow channel plate 20 is disposed on the side of the bottom wall 13 of the tray 10 opposite the receiving cavity; and the flow channel plate 20 is further configured with a second hollowed part 23, the second hollowed part 23 is hollowed in the direction opposite to the bottom wall 13, and the side of the second hollowed part 23 opposite the bottom wall 13 is connected to the bottom protection plate 40. The second hollowed part 23 is used to connect the flow channel plate 20 and the bottom protection plate 40, for example by gluing or welding, etc.

[0085] In some embodiments, the second hollowed part 23 is machined on the flow channel plate 20 by press forming.

[0086] In some embodiments, the flow channel plate 20 is disposed on the side of the bottom wall 13 of the tray 10 opposite the receiving cavity; the flow channel plate 20 is configured with a welded region 42 and a non-welded region (not shown), the flow channel 22 is disposed in the non-welded region, and the welded region 42 is welded to the bottom wall 13; the non-welded region and the bottom wall 13 are spaced apart and are arranged surrounding each other to form a plurality of spacing regions; the thickness of the flow channel plate 20 is defined by Tp; in the width x direction of the flow channel plate 20, the size of the spacing region is defined by Lp and < 20 Tj; and / or, in the direction of the thickness of the flow channel plate 20, the size of the bottom wall is defined by T2, and T2 < 2 Tr

[0087] The smaller the weld-free region, i.e. the smaller the width of the spacing region, the fewer bond defects there are, for example, weld defects, between the flow channel plate 20 and the tray 10. Therefore, setting L] < 20 T j improves the stability of the bond between the flow channel plate 20 and the tray 10.

[0088] The thickness T2 of the bottom wall 13 of the tray 10 is less than or equal to twice the thickness Tj of the flow channel plate 20. As it is necessary to machine the first hollowed part 21 and similar on the flow channel plate 20, the flow channel plate 20 must be thicker, and the bottom wall of the tray 10 is thinner, thereby reducing the total weight of the battery pack 100.

[0089] The weld-free region includes at least one flow channel region 41 in which the flow channel 22 is disposed, and the spacing regions include at least the flow channel 22.

[0090] In some embodiments, a safety factor for the battery pack is defined by a, the size of the flow channel is defined by < aLj and 1.2 < a < 1.5. In the present embodiment, defining the safety factor is conducive to improving the reliability of the battery pack 100.

[0091] L] < 20 Tp Hx < a Lj = 20 aTp for example, when a is equal to 1.2, < 20 * 1.2 Tj, i.e., Hj < 24 Tp

[0092] In some embodiments, the value of a can be 1.2, 1.3, 1.35, 1.4, 1.45, and similar values. Of course, within the associated range, the value of a is not limited to this and can be defined and selected according to real-world situations.

[0093] In some embodiments, the thickness of the cover plate is T3, where T3 < 2T. In a battery pack 100, Tp, T2 and T3 have three ratios of magnitude, which are respectively: T2 < 2 Tj; or T3 < 2Tj; or T2 < 2Ti and T3 < 2 Tp. As it is necessary to machine the first hollowed part 21 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 are made thinner, thereby facilitating the reduction of the total weight of the battery pack 100.

[0094] In certain embodiments, the thickness of the plate 10 can be from 1.2 mm to 1.8 mm. Specifically, the thickness can be 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, and similar. Of course, within this range, the thickness value is not limited to this and can be defined and selected according to actual circumstances.

[0095] In some embodiments, the tray 10, which serves as the upper flow channel plate of the flow channel plate 20, is configured with two water inlet and outlet ports, and the coolant enters and exits the two water inlet and outlet ports to regulate the overall temperature of the battery pack 100.

[0096] In some embodiments, the flow channel plate 20 is configured with a plurality of flow channel regions 41 and a plurality of weld regions 42, and the plurality of flow channel regions 41 and the plurality of weld regions 42 are arranged in a cross manner, so as to improve the stability of the bond between the flow channel plate 20 and the tray 10 and the thermal management performance of the tray 10.

[0097] In certain embodiments, the first hollowed portion 21 and the second hollowed portion 22 are arranged parallel to each other and are staggered in a predetermined direction. In this way, along the direction of coolant flow 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 protection plate 40. Consequently, the channel plate The flow channel plate 20 is subjected to more uniform stresses, and the flow channel plate 20 and the bottom protection plate 40 are connected more firmly.

[0098] In some embodiments, a flow channel may be disposed in the crossbar in order to improve the heat transfer performance and reliability of the battery pack 100. In addition, the weight of the crossbar may be reduced.

[0099] The flow channel can be an air channel or a coolant flow channel.

[0100] The present description further provides a battery pack housing body, the above embodiments can be cited specifically by reference, and the details are therefore not described again here.

[0101] In the present embodiment, the battery pack housing body comprises a tray, a flow channel plate and a cover plate, wherein the tray is configured with a receiving cavity having an opening; the flow channel plate is disposed on the side of the tray opposite the receiving cavity, the flow channel plate is configured with a first hollowed portion, the first hollowed portion is hollowed in a direction opposite to the tray, the tray and the first hollowed portion are spaced apart and are arranged surrounding each other to form a flow channel, and the flow channel is used for the flow of a coolant; the cover plate covers the opening to close the receiving cavity; and the tray is a composite plate formed by stamping.

[0102] According to one aspect, the tray and the first hollowed portion are arranged surrounding each other to form the flow channel, so that the tray is arranged as the upper flow channel plate of the flow channel, in order to save the upper flow channel plate, which improves the level of integration of the battery pack housing body, and reduces the overall height and assembly complexity of the battery pack housing body; according to another aspect, since the tray is a composite plate formed by stamping, the structural strength and sealing performance of the tray can be improved, and the reliability of the battery pack is thus improved;and in yet another aspect, the flow channel plate is disposed outside the tray in the present embodiment, so that the influence of the coolant inside the flow channel plate on internal elements, such as the battery cell module, can be reduced, thereby further improving the reliability of the battery pack.

[0103] Furthermore, the tray in the present description has a boat-shaped structure; the main structure is formed in one piece by stamping and therefore has no weld joints, so that the overall reliability of the structure's sealing be relatively high; and the material can be AL6016 / 3003 / 6016, which is a 6 series and 3 series aluminum composite plate material, and stamping is done after the material has been heated by a mold, thus having a lightness effect, and strength can be improved by more than 50% compared with current 6 series aluminum materials, thus greatly improving the safety and reliability of the whole structure.

[0104] Furthermore, under the influence of a stamping thinning rate of the flow channel plate, the height of the flow channel on the flow channel plate does not exceed 5 times the associated wall thickness Tj, the width Lj of a hollow cavity in the welding region of the flow channel plate and the tray does not generally exceed 20 times Tp and is generally an integer; and the wall thickness T2 of the bottom wall of the tray does not exceed twice the wall thickness Tj of the flow channel plate, a safety factor of 1.2 times is defined, it can be defined by < 1.2 * 20 Tp or H1 < 24 Tp And the value of should be as low as possible in order to meet the design requirements of the liquid cooling system.

[0105] In addition, a buffer foam is disposed between the bottom protection plate and the flow channel plate to fill a space between the flow channel plate and the bottom protection plate, and meanwhile play a role in dispersing stresses when subjected to an external force, so that the structure can improve the safety of the whole structure to some extent.

[0106] The flow channel is formed by stamping on an upper flow channel plate or a lower flow channel plate; the flow channel is used for the flow of the coolant, and the means of ensuring that the coolant has an appropriate flow rate and velocity in the flow channel and reducing the height of the battery pack is a problem that must be solved while ensuring that the battery pack has sufficient structural strength.

[0107] To this end, the present description further provides a battery pack in another embodiment, as illustrated in Figures 9 to 14. The battery pack 100 comprises a tray 10, a flow channel plate 20, a cover plate 30, and a battery cell module. Figure 9 is an exploded view diagram of another embodiment of a battery pack provided in this description; Figure 10 is a schematic top view of another embodiment of a tray provided in this description; Figure 11 is a schematic top view of another embodiment of a channel plate flow provided in this description; [Fig. 12] is a schematic top view of another embodiment of a battery pack provided in this description; [Fig. 13] is a cross-sectional view of [Fig. 12] along AA; and [Fig. 14] is a diagram of an enlarged structure of [Fig. 13] at B.

[0108] Specifically, the flow channel plate 20 is mounted on a bottom wall of the tray 10, the flow channel plate 20 is configured with a first hollowed portion 21, the first hollowed portion 21 is hollowed in a direction close to the bottom wall of the tray 10, the cover plate 30 covers the side of the flow channel plate 20 opposite the bottom wall of the tray 10, and the cover plate and the first hollowed portion 21 are spaced apart and arranged surrounding each other to form a flow channel 22, and the flow channel 22 is used for the flow of a coolant, wherein the thickness of the flow channel plate 20 is Tp in the direction of the thickness of the flow channel plate 20, the height of the flow channel 22 is H1 and 1,5 Tj < H1 < 4 Tp The battery cell module is mounted on the side of the cover plate 30 opposite the flow channel plate 20.

[0109] It can be understood that the greater the height of the flow channel 22, the higher the flow rate of the coolant in the flow channel 22, assuming the same width of the flow channel 22, which is more conducive to heat exchange with the battery cell module. However, if the height H1 of the flow channel 22 is too great, the depth of the first recessed portion 21 must be greater, so that the flow channel plate 20 is smaller. Furthermore, assuming the same width of the flow channel 22 and the same coolant inlet pressure, if the height H1 of the flow channel 22 is too great, the flow velocity of the coolant in the flow channel 22 is reduced, which is not conducive to heat dissipation from a battery cell.Therefore, defining l,5Tj < Hq < 4Tj not only ensures that the coolant flowing in the flow channel 22 has a sufficient flow rate and appropriate flow velocity, but also allows the flow channel plate 20 to have sufficient structural strength. Specifically, the first hollowed portion 21 can be machined on the flow channel plate 20 by press forming.

[0110] Furthermore, the cover plate 30 and the side of the flow channel plate 20 opposite the bottom wall of the tray 10 are arranged surrounding each other 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, in order to save the upper flow channel plate, which improves the level of integration of the battery pack 100, and reduces the overall height and assembly complexity of the battery pack 100. [YES] Preferably, the value of Hj can be 1.5 Tp, 2 Tp, 2.5 Tp, 3 Tp, 3.5 Tp, 4 Tp, or similar. Of course, within the associated range, the value is not limited to this and can be defined and selected according to actual situations.

[0112] The thickness of the bottom wall of the tray 10 is T2, the thickness of the cover plate is T3, where T2 < Tj; and / or T3 < Tp. That is to say, in a battery pack 100, Tp, T2 and T3 have three ratios of magnitude, which are respectively: T2 < T1; or T3 <Ti; ouT2<TpetT3<TpComme il est nécessaire d’usiner la première partie évidée 21 sur la plaque de canal d’écoulement 20, la plaque de canal d’écoulement 20 doit être rendue plus épaisse, et la plaque de recouvrement 30 et la paroi de fond du plateau 10 sont rendues plus minces, facilitant de ce fait la réduction du poids total du bloc-batterie 100.

[0113] In some embodiments, the cover plate 30, the flow channel plate 20, and the tray 10 are made of steel, the cover plate 30 is welded to the flow channel plate 20, and the flow channel plate 20 is welded to the tray 10. Alternatively, in another embodiment, the cover plate 30 is made of aluminum, the flow channel plate 20 and the tray 10 are both made of steel, the cover plate 30 is bonded to the flow channel plate 20, and the flow channel plate 20 is welded to the tray 10. In this way, the cover plate 30, the flow channel plate 20, and the tray 10 can be joined together without using a connecting piece, which not only ensures more convenient assembly but also saves internal space in the battery pack, thus reserving more large space for mounting other parts.

[0114] With reference to Figures 13 and 14, the flow channel plate 20 is further configured with a second hollowed part 23, the second hollowed part 23 is hollowed in the direction near the bottom wall of the tray 10, one side of the second hollowed part 23 is connected to the bottom wall of the tray 10, and the other side of the second hollowed part 23 and the cover plate 30 are spaced apart and arranged surrounding each other to form a hollow cavity structure 24. In the direction of the thickness of the flow channel plate 20, the height of the hollow cavity structure 24 is H2, and < 4 Tj < H2. It can be understood that the second hollowed-out part 23 is used to form a support between the tray 10 and the cover plate 30. The greater the height H2 of the hollow cavity structure 24, the greater the distance between the cover plate 30 and the plate of The flow channel 20 is important, so there must be sufficient space between the cover plate 30 and the flow channel plate 20 to accommodate flow channels 22 of different specifications. Therefore, setting < 4 Tj < H2 allows for the convenient placement of flow channels 22 of different specifications between the cover plate 30 and the flow channel plate 20. Specifically, the second hollowed portion 23 is machined onto the flow channel plate 20 by press forming.

[0115] In certain embodiments, as illustrated in Figure 14, the thickness of the bottom wall of the tray 10 is T2, and the thickness of the cover plate 30 is T3, where T2 <T1etT3<T1,la distance entre les deux faces latérales, opposées l’une à l’autre, de la plaque de recouvrement 30 et la paroi de fond du plateau 10 est L, le facteur de sécurité du bloc-batterie est défini par a, et L > 7 a T p The distance L between the two lateral faces, opposite each other, of the cover plate 30 and the bottom wall of the tray 10 refers to a thickness at the end of the assembly of the tray 10, the flow channel plate 20 and the cover plate 30. L = H2 + T j + T2 + T3, and in combination with T2 < Tp T3 < Tjet 4 < H2, we can know that L > 7 Tp Furthermore, defining the safety factor is conducive to improving the reliability of the battery pack structure.

[0116] In some embodiments, 1.2 < a < 1.5. For example, the value of a can be 1.2, 1.3, 1.35, 1.4, 1.45, and so on. Of course, within the associated range, the value of a is not limited to this and can be defined and selected according to real-world situations.

[0117] In certain embodiments, as illustrated in Figures 11 and 14, the first hollowed portion 21 and the second hollowed portion 22 are arranged parallel to each other and are staggered in a predetermined direction. In this way, along the direction of flow 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 tray 10. Consequently, the flow channel plate 20 is subjected to more uniform stresses, and the flow channel plate 20 and the tray 10 are more firmly connected.

[0118] By way of example, the first hollowed part 21 and the second hollowed part 23 are arranged parallel to each other and are arranged in a staggered pattern in the direction of the width of the plate 10.

[0119] In certain embodiments, as illustrated in [Fig. 9], the flow channel plate 20 comprises a main plate 25 and a flange 26, the flange 26 is arranged around the periphery of the main plate 25, and the Flange 26 is connected to a side wall of the plate 10. Flange 26 is used to increase the contact area between the flow channel plate 20 and the plate 10, thereby improving the strength of the connection between the flow channel plate 20 and the plate 10. The first hollowed part 21 and the second hollowed part 23 are both formed on the main plate 25.

[0120] As illustrated in [Fig.12], the cover plate 30 is further configured with a water inlet 31 and a water outlet 32, and the water inlet 31 and the water outlet 32 ​​communicate respectively with the flow channel 22, so that the coolant flows into the flow channel 22, or the coolant flows out of the flow channel 22.

[0121] In certain embodiments, the area of ​​a lateral face of the cover plate 30 for mounting the battery cell module is Sh, the actual contact area between the battery cell module and the flow channel plate 20 is S2, the projection area of ​​the flow channel plate 20 onto the bottom wall of the tray 10 is S3, and 82 < Si < S3. That is, S2 / S3 < Sj / S3 < 1, in this way the flow channel plate 20 can provide a sufficiently large mounting area for the cover plate 30, and the cover plate 30 can provide a sufficiently large mounting area for the battery cell module.Furthermore, it can be understood that once the capacity of the battery pack is determined, the size of the battery cell module and the projection area of ​​the flow channel plate 20 on the bottom wall of the tray 10 are fixed values, namely, s2 / s3 is a fixed value, when S2 / S3 < Sj / S3 < 1 is satisfied, the smaller the value of 8^85, the smaller the cover plate 30, which is more conducive to a lightweight effect of the battery pack 100.

[0122] The present description further provides an automobile, comprising the above battery pack, and the details are therefore not described here again.

[0123] The above descriptions are only embodiments of the present description and are therefore not intended to limit the scope of the patent of the present description, and any equivalent structures or equivalent process transformations made using the specification and drawings of the present description, or direct or indirect applications to other related technical fields are all included in the scope of protection of the patent of the present description.

Claims

Demands

1. Battery pack housing body, comprising: a tray (10), configured with a receiving cavity having an opening; a flow channel plate (20), disposed on one side of the tray (10) opposite the receiving cavity, in which the flow channel plate (20) is configured with a first hollowed portion (21), the first hollowed portion (21) is hollowed in a direction opposite to the tray (10), the tray (10) and the first hollowed portion (21) are spaced apart and are arranged surrounding each other to form a flow channel (22), and the flow channel (22) is used for the flow of a coolant; and a cover plate (30), covering the opening to close the receiving cavity, in which the tray (10) is a composite plate formed by stamping.

2. Battery pack housing body according to claim 1, wherein the composite plate comprises at least a first layer of aluminum and a second layer of aluminum; and the first layer of aluminum and the second layer of aluminum have different alloy components at least in part.

3. Battery pack housing body according to claim 1, in which the flow channel plate (20) is disposed on one side of a bottom wall (13) of the tray (10) opposite the receiving cavity, and the battery pack housing body further comprises: a bottom protection plate (40), disposed on one side of the flow channel plate (20) opposite the bottom wall (13).

4. Battery pack housing body according to claim 3, wherein the battery pack housing body further comprises a buffer element (50), disposed between the bottom protection plate (40) and the flow channel plate (20).

5. A battery pack enclosure according to claim 1, wherein the tray (10) is configured with two first side walls (14) arranged opposite each other and spaced apart, and two second side walls (12) arranged opposite each other; and in one direction the thickness of the channel plate flow (20), a size of a first lateral wall (14) is greater than a size of a second lateral wall (12).

6. Battery pack housing body according to any one of claims 1 to 5, wherein the flow channel plate (20) is disposed on one side of a bottom wall (13) of the tray (10) opposite the housing cavity; the flow channel plate (20) is configured with a welded region (42) and a non-welded region, the flow channel (22) is disposed in the non-welded region, and the welded region (42) is welded to the bottom wall (13); the non-welded region and the bottom wall (13) are spaced apart and are arranged surrounding each other to form a plurality of spacing regions; a thickness of the flow channel plate (20) is defined by T1; in one direction of the width of the flow channel plate (20), a size of a spacing region is defined by Lp and Lj < 20 T ।;and / or in a direction of the thickness of the flow channel plate (20), a bottom wall size is defined by T2, and T2 < 2 Tp;

7. Battery pack housing body according to claim 6, wherein a safety factor of a battery pack is defined by a, in a direction of the thickness of the flow channel plate (20), a size of the flow channel (22) is defined by Hx < aLj and 1.2 < a < 1.

5.

8. Battery pack housing body according to any one of claims 1 to 5, wherein a thickness of the flow channel plate (20) is defined by Tp in a direction of the thickness of the flow channel plate (20), a size of the flow channel (22) is defined by and < 5 Tp

9. Battery pack, comprising: the battery pack housing body according to any one of claims 1 to 8; and a module (60) of battery cells, disposed in the housing cavity.

10. Battery pack, comprising a tray (10), a flow channel plate (20) and a cover plate (30), wherein the flow channel plate (20) is mounted on a bottom wall of the tray (10), the flow channel plate (20) is configured with a first hollowed portion (21), the first hollowed portion (21) is hollowed in a direction close to the bottom wall of the tray (10); the cover plate (30) covers one side of the flow channel plate (20) opposite the bottom wall of the tray (10), and the cover plate (20) and the first hollowed portion (21) are spaced apart and arranged surrounding each other to form a flow channel (22), and the flow channel (22) is used for the flow of a coolant; and a thickness of the flow channel plate (20) is Tp in one direction of the thickness of the flow channel plate (20), a height of the flow channel (22) is and 1.5 < 4Tp

11. Battery pack according to claim 10, wherein a thickness of the bottom wall of the tray (10) is T2, and a thickness of the cover plate (30) is T3, where T2 < Tp and / or T3 < Tp

12. Battery pack according to claim 10, wherein the flow channel plate (20) is further configured with a second hollowed part (23), the second hollowed part (23) is hollowed in the direction near the bottom wall of the tray (10), one side of the second hollowed part (23) is connected to the bottom wall of the tray (10), and the other side of the second hollowed part (23) and the cover plate (30) are spaced apart and arranged surrounding each other to form a hollow cavity structure (24), wherein, in the direction of the thickness of the flow channel plate (20), a height of the hollow cavity structure (24) is H2, and H1 < 4 Tj < H2.

13. Battery pack according to claim 12, wherein a thickness of the bottom wall of the tray (10) is T2, and a thickness of the cover plate (30) is T3, where T2 < T1 and T3 < T1; a distance between two lateral faces, which are opposite to each other, of the cover plate (30) and the bottom wall of the tray (10) is L, a safety factor of the battery pack is defined by a, and L > 7a T1

14.

15. 11- Battery block according to claim 13, wherein 1.2 < a < 1.

5. Battery block according to claim 12, wherein the first hollowed part (21) and the second hollowed part (23) are arranged parallel to each other and are arranged in a staggered pattern in a predefined direction.

16. Battery pack according to claim 10, wherein the battery pack further comprises a battery cell module, and the battery cell module is mounted on one side of the cover plate (30) opposite the flow channel plate (20); and an area of ​​a lateral face of the cover plate (30) for mounting the battery cell module is Sh, an actual contact area between the battery cell module and the flow channel plate (20) is S2, a projection area of ​​the flow channel plate (20) onto the bottom wall of the tray (10) is S3, and S2 < Si < S3.

17. Battery pack according to claim 10, wherein the flow channel plate (20) comprises a main plate (25) and a flange (26), the flange (26) is disposed on a periphery of the main plate (25) in an enclosing manner, and the flange (26) is connected to a side wall of the plate (10).

18. Battery pack according to claim 10, wherein the cover plate (30), the flow channel plate (20) and the tray (10) are all made of steel, the cover plate (30) is welded to the flow channel plate (20), and the flow channel plate (20) is welded to the tray (10); or, the cover plate (30) is made of aluminum, the flow channel plate (20) and the tray (10) are both made of steel, the cover plate (30) is bonded to the flow channel plate (20), and the flow channel plate (20) is welded to the tray (10).

19. Automobile, comprising the battery pack according to any one of claims 9, and 10 to 18.

Images