CN217655956U

CN217655956U - Shell assembly of battery pack, battery pack and power device

Info

Publication number: CN217655956U
Application number: CN202221440139.4U
Authority: CN
Inventors: 任飞; 杨聪; 孙艳; 其他发明人请求不公开姓名
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2022-06-09
Filing date: 2022-06-09
Publication date: 2022-10-25
Anticipated expiration: 2032-06-09

Abstract

The utility model discloses a shell assembly, battery package and power device of battery package. The housing assembly of this battery package includes: the battery pack comprises a shell main body, a cooling piece, a bottom protection plate, a reinforcing plate and an elastic buffer piece, wherein the shell main body is used for installing a battery module of the battery pack, the cooling piece is arranged on the shell main body and used for exchanging heat with the battery module, the bottom protection plate is arranged on one side, far away from the shell main body, of the cooling piece and is connected with the shell main body, the reinforcing plate is arranged between the cooling piece and the bottom protection plate and is connected with the cooling piece, and the elastic buffer piece is arranged between the bottom protection plate and the reinforcing plate. According to the utility model discloses battery pack's casing assembly, reinforcing plate locate between cooling piece and the end backplate and be connected with the cooling piece, and elastic buffer locates between end backplate and the cooling piece to be favorable to promoting casing assembly at the bearing capacity of cooling piece one side, reduce the risk that the cooling piece became invalid.

Description

Shell assembly of battery pack, battery pack and power device

Technical Field

The utility model relates to a power device technical field particularly, relates to a casing assembly, battery package and power device of battery package.

Background

The battery pack is used as a high-energy-density energy storage component of an electric automobile, the safety of the structure of the battery pack is related to the safety of the whole automobile, the battery pack is impacted and deformed and damaged due to pothole roads, road surface barriers, ground impact objects and the like in the driving process of the electric automobile, the deformation of the battery pack is particularly easy to extrude a cooling flow channel of a cooling piece, the cooling flow channel is broken and leaked, and therefore the cooling piece is invalid, the battery pack cannot dissipate heat, and the safety of the whole automobile is affected.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the above-mentioned technical problem among the prior art to a certain extent at least. Therefore, the utility model provides a casing assembly of battery package to promote the bearing capacity of casing assembly in cooling part one side, reduce the risk that the cooling part became invalid.

The utility model also provides a battery package of casing subassembly that has above-mentioned battery package.

The utility model also provides a power device of having above-mentioned battery package.

According to the utility model discloses shell assembly of battery package, include: a case main body for mounting a battery module of the battery pack; the cooling piece is arranged on the shell main body and is used for exchanging heat with the battery module; the bottom guard plate is arranged on one side, far away from the shell main body, of the cooling piece and is connected with the shell main body; the reinforcing plate is arranged between the cooling piece and the bottom protective plate and is connected with the cooling piece; the elastic buffer piece is arranged between the bottom protective plate and the reinforcing plate.

According to the utility model discloses battery pack's casing assembly, reinforcing plate locate between cooling piece and the end backplate and be connected with the cooling piece, and elastic buffer locates between end backplate and the cooling piece to be favorable to promoting casing assembly at the bearing capacity of cooling piece one side, reduce the risk that the cooling piece became invalid.

According to some embodiments of the invention, the shape of the stiffening plate and the cooling element are close to the surface adaptation of the elastomeric buffer.

Further, the cooling member includes: the flow channel plate is arranged between the base plate and the reinforcing plate, the base plate and the flow channel plate define a medium flow channel together, the flow channel plate is provided with a first connecting part connected with the base plate, and the reinforcing plate is provided with a second connecting part connected with the first connecting part.

According to some embodiments of the utility model, the second connecting portion are a plurality of, at least adjacent two be formed with the assembly groove between the second connecting portion, the assembly groove with the medium runner corresponds.

Further, the surface of the bottom guard plate close to the cooling piece is separated from the surface of the first connecting portion close to the bottom guard plate by a distance H1, the height of the reinforcing plate is H2, and the following relational expression is satisfied: h2 is more than or equal to H1/2.

Further, the reinforcing plate and the runner plate are made of the same material.

Further, along the height direction of the shell main body, the elastic buffer piece corresponds to the medium flow channel.

Further, the elastic buffer piece is abutted between the assembling groove and the bottom protection plate.

According to the utility model discloses another aspect embodiment's battery package, including foretell casing assembly.

According to the utility model discloses battery package, reinforcing plate locate between cooling piece and the end backplate and be connected with the cooling piece, and elastic buffer locates between end backplate and the cooling piece to be favorable to promoting the bearing capacity of the casing subassembly of battery package in cooling piece one side, reduce the risk that the cooling piece became invalid, and then be favorable to promoting the security of battery package.

According to another aspect of the present invention, a power device includes the above battery pack.

According to the utility model discloses power device, the reinforcing plate is located and is connected with the cooling piece between cooling piece and the end backplate, and springy cushioning spare locates between end backplate and the cooling piece to the shell assembly who is favorable to promoting the battery package reduces the risk that the cooling piece became invalid at the bearing capacity of cooling piece one side, and then is favorable to promoting power device's security.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a schematic diagram of a battery pack according to an embodiment of the present invention;

fig. 2 is an exploded view of a battery pack according to an embodiment of the present invention;

fig. 3 is a schematic view of a stiffener according to an embodiment of the present invention;

FIG. 4 is a schematic view of a portion of the structure of the cooling element, the stiffener, the elastomeric cushion, and the backplate according to an embodiment of the present invention;

fig. 5 is an enlarged view of fig. 4 at a.

Reference numerals:

the battery pack comprises a case body 1, an upper cover 11, a lower case 12, an edge beam 121, a cooling member 2, a base plate 21, a runner plate 22, a first connecting portion 221, a runner portion 222, a medium runner 23, a bottom guard plate 3, a guard plate flange 31, a reinforcing plate 4, a second connecting portion 41, an assembling groove 42, an elastic buffer member 5, a case assembly 10, a battery module 20 and a battery pack 100.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "height", "length", "width", "thickness", "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically connected, electrically connected or can communicate with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

The housing assembly 10, and the battery pack 100 and the power device having the same according to the embodiment of the present invention will be described in detail with reference to fig. 1 to 5.

Referring to fig. 1 to 5, a case assembly 10 of a battery pack 100 includes: shell main part 1, cooling piece 2, end backplate 3, reinforcing plate 4 and springiness cushioning spare 5, wherein:

the case main body 1 is used for installing the battery module 20 of the battery pack 100, the case main body 1 may include an upper cover 11 and a lower case 12 which are connected, a battery accommodating chamber is defined in the upper cover 11 and the lower case 12, and the battery module 20 may be fixed in the battery accommodating chamber.

The cooling part 2 is arranged on the shell main body 1 and used for exchanging heat with the battery module 20, and the temperature of the battery module 20 can be adjusted by the cooling part 2, so that the battery module 20 can work at a proper temperature, and the charging and discharging performance of the battery module 20 can be ensured. The cooling member 2 may be disposed under the lower case 12, and the cooling member 2 may be fixed to the edge beam 121 of the lower case 12 by a fastener.

The bottom guard plate 3 is arranged on one side of the cooling part 2 far away from the shell body 1 and is connected with the shell body 1, the bottom guard plate 3 is of a flat plate structure substantially, so that the appearance attractiveness of the battery pack 100 is guaranteed, and the insulating corrosion prevention and processing and manufacturing process cost of the bottom guard plate 3 can be reduced. The bottom guard plate 3 can be made of a high-strength and high-ductility material, and the bottom guard plate 3 can show excellent energy absorption performance in the process of external impact. The guard plate flange 31 may be disposed on the periphery of the bottom guard plate 3, and the guard plate flange 31 may be fixedly connected to the edge beam 121 of the lower housing 12 through a fastener.

The reinforcing plate 4 is arranged between the cooling part 2 and the bottom protective plate 3 and connected with the cooling part 2, the reinforcing plate 4 can protect the cooling part 2, the elastic buffer part 5 is arranged between the bottom protective plate 3 and the reinforcing plate 4, namely, the elastic buffer part 5 is arranged in a gap between the bottom protective plate 3 and the reinforcing plate 4, the elastic buffer part 5 and the bottom protective plate 3 can form a sandwich structure, so that the bottom protective plate 3 absorbs energy in the external impact process, the stress area of the bottom protective plate 3 and the reinforcing plate 4 is increased when the bottom protective plate 3 deforms, the bottom protective plate 3 and the reinforcing plate 4 are prevented from generating single-point or linear contact, stress concentration is reduced, the bearing capacity of the shell assembly 10 on one side of the cooling part 2 is favorably improved, the extrusion and intrusion of the bottom protective plate 3 to the cooling part 2 are reduced in the external impact process, the reliability and safety of the shell assembly 10 are favorably enhanced, and the reliability of the cooling part 2 is ensured.

It should be noted that the elastic buffer 5 may be a hard superelastic material, for example, the elastic buffer 5 is MPP (micro-porous foamed polypropylene), and the MPP has good shock absorption and buffering performance so as to absorb energy when the backplate 3 is impacted by an external impact, and avoid stress concentration, thereby being beneficial to improving the bearing capacity of the backplate 3 and the reinforcing plate 4.

According to the utility model discloses battery package 100's casing assembly 10, reinforcing plate 4 are located between cooling piece 2 and the end backplate 3 and are connected with cooling piece 2, and springy cushioning spare 5 is located between end backplate 3 and the cooling piece 2 to be favorable to promoting casing assembly 10 at the bearing capacity of cooling piece 2 one side, reduce the risk that cooling piece 2 became invalid.

In some embodiments of the present invention, referring to fig. 3-5, the shape of the reinforcing plate 4 and the surface of the cooling element 2 close to the elastic buffer element 5 are adapted, that is, the reinforcing plate 4 can be disposed on the surface of the cooling element 2 close to the elastic buffer element 5 along with the shape, and the reinforcing plate 4 can be attached to the surface of the cooling element 2 close to the elastic buffer element 5 to protect the cooling element 2, increase the strength of the cooling element 2, and avoid the cooling element 2 from being damaged and disabled when the housing assembly 10 is impacted externally.

In some embodiments of the present invention, as shown with reference to fig. 4 and 5, the cooling element 2 comprises: a base plate 21 and a flow channel plate 22, the flow channel plate 22 being provided between the base plate 21 and the reinforcing plate 4, the base plate 21 and the flow channel plate 22 together defining a medium flow channel 23, the flow channel plate 22 having a first connecting portion 221 connected to the base plate 21. It can be understood that the substrate 21 can exchange heat with the battery module 20, the flow channel plate 22 is disposed on a side of the substrate 21 away from the battery module 20, the flow channel plate 22 can include a first connection portion 221 and a flow channel portion 222, the first connection portion 221 is a region where the flow channel plate 22 is attached to the substrate 21, the flow channel portion 222 is a region where the flow channel plate 22 is separated from the substrate 21, the flow channel portion 222 and the substrate 21 can jointly define the medium flow channel 23, a heat exchange medium can flow through the medium flow channel 23, and the heat exchange medium can be a cooling liquid or air.

The reinforcing plate 4 has the second connecting portion 41 connected to the first connecting portion 221, that is, the reinforcing plate 4 can be closely attached to the outer surface of the flow channel plate 22 away from the base plate 21, and at least a portion of the reinforcing plate 4 is connected to the first connecting portion 221, so that when an external impact force is transmitted to the reinforcing plate 4, the reinforcing plate 4 can transmit the external impact force to the first connecting portion 221 of the flow channel plate 22 through the second connecting portion 41, and further disperse the force transmission through the base plate 21 connected to the first connecting portion 221, so as to reduce the stress of the area where the flow channel plate 22 is separated from the base plate 21, that is, reduce the stress of the flow channel portion 222, and further facilitate reducing the deformation of the flow channel plate 22 at the flow channel portion 222, so as to reduce the risk of leakage failure of the medium flow channel 23. Preferably, the second connecting portion 41 is in surface-fit connection with the first connecting portion 221, and the width of the second connecting portion 41 is widened as much as possible to increase the fit area between the second connecting portion 41 and the first connecting portion 221, so as to increase the force-bearing area during force transmission and reduce stress concentration.

In some embodiments of the present invention, as shown in fig. 3 to 5, the second connecting portions 41 are plural, the assembling groove 42 is formed between at least two adjacent second connecting portions 41, the assembling groove 42 corresponds to the medium flow channel 23, the assembling groove 42 can protect the medium flow channel 23, and the assembling groove 42 can disperse the impact force transmitted to the medium flow channel 23 to the second connecting portions 41, so as to improve the safety and reliability of the medium flow channel 23.

In some embodiments of the present invention, the assembling groove 42 is attached to the flow channel portion 222, or a certain gap is provided between the assembling groove 42 and the flow channel portion 222, it can be understood that, when the assembling groove 42 is attached to the flow channel portion 222, the assembling groove 42 can improve the strength and rigidity of the flow channel portion 222, so as to reduce the deformation and damage of the flow channel portion 222 when the impact force is transmitted to the flow channel portion 222, and also reduce the thermal contact resistance between the assembling groove 42 and the flow channel portion 222, thereby ensuring the heat transfer performance. When a certain gap is formed between the assembly groove 42 and the flow path portion 222, a collapsing space for deforming the assembly groove 42 can be formed between the assembly groove 42 and the flow path portion 222, so that energy is absorbed through collapsing deformation of the assembly groove 42, and stress on the flow path portion 222 is reduced.

In some embodiments of the present invention, referring to fig. 5, the surface of the bottom protection plate 3 close to the cooling element 2 and the surface of the first connection portion 221 close to the bottom protection plate 3 are spaced apart by a distance H1, the height of the reinforcing plate 4 is H2, and the following relations are satisfied: h2 is more than or equal to H1/2, namely H2 is not less than half of H1, so that the installation space of the elastic buffer piece 5 is ensured, the height of the reinforcing plate 4 is increased as much as possible, the strength of the protection structure of the shell assembly 10 on one side of the cooling piece 2 is enhanced, the area of the flow passage plate 22 corresponding to the medium flow passage 23 is protected, and the protection capability of the shell assembly 10 on one side of the cooling piece 2 is integrally enhanced. If H2 is smaller than H1/2, the rigidity of the housing assembly 10 on the cooling member 2 side is poor, the load-bearing capacity is low, and the area of the flow channel plate 22 corresponding to the medium flow channel 23 is easily deformed by force, resulting in poor reliability.

It can be understood that, referring to fig. 5, in the height direction of the reinforcing plate 4, the maximum distance between the bottom protection plate 3 and the cooling element 2 is H1, the reinforcing plate 4 and the elastic buffer element 5 are connected to the gap between the bottom protection plate 3 and the cooling element 2, and the height H2 of the reinforcing plate 4 and the thickness H4 of the elastic buffer element 5 satisfy H1= H2+ H4, so that the bottom protection plate 3, the elastic buffer element 5 and the reinforcing plate 4 can be kept connected to form a reliable force transmission channel, and when the bottom protection plate 3 is impacted by the outside, the force transmission path can be: the backplate 3 → the elastic buffer 5 → the fitting groove 42 → the second connecting portion 41 → the first connecting portion 221 → the substrate 21, so that it is possible to avoid the flow path portion 222 on the force transmission path to reduce the risk of deformation and leakage of the medium flow path 23.

In some embodiments of the present invention, referring to fig. 5, a thickness H4 of the elastic buffer 5 is an initial thickness of the elastic buffer 5, that is, a thickness of the elastic buffer 5 in an unstretched or compressed natural state, a surface of the bottom protective plate 3 close to the cooling element 2 and a surface separation distance of the flow channel portion 222 close to the bottom protective plate 3 are H3, a thickness of the reinforcing plate 4 is H5, and the following relations are satisfied: h4= H3-H5, that is, the elastic buffer 5 is connected between the backplate 3 and the reinforcing plate 4, and the elastic buffer 5 is in a natural state, so as to prevent the elastic buffer 5 from being in a compressed or stretched state during assembly, prevent the elastic buffer 5 from generating an acting force on the backplate 3 and the reinforcing plate 4, and prevent the backplate 3 and the reinforcing plate 4 from being deformed. Simultaneously, elastic buffer 5 and end backplate 3 and reinforcing plate 4 all face contact, and elastic buffer 5 in natural state can effectively play buffering and guard action fast when end backplate 3 receives outside impact, and will cushion the impact after to 4 direction transmissions of reinforcing plate, and elastic buffer 5 reducible end backplate 3 and the stress concentration of reinforcing plate 4 to avoid end backplate 3 and reinforcing plate 4 stress concentration when initial striking, prevent that end backplate 3 and reinforcing plate 4 from taking place to buckle. In addition, the reinforcing plate 4 can be closely attached to the flow passage plate 22 to reduce thermal contact resistance and ensure heat transfer performance.

In some embodiments of the present invention, the material of the reinforcing plate 4 is the same as that of the flow channel plate 22, so as to reduce the influence of the reinforcing plate 4 on the heat dissipation performance of the flow channel plate 22. Alternatively, the reinforcing plate 4 may be fixed to the flow field plate 22 by welding, bonding, or the like, for example, the reinforcing plate 4 may be fixed to the flow field plate 22 by brazing, or the reinforcing plate 4 may be fixed to the flow field plate 22 by gluing with a heat conductive structure.

In some embodiments of the present invention, referring to fig. 2, 4 and 5, along the height direction of the shell main body 1, the elastic buffer 5 corresponds to the medium flow channel 23 to buffer and absorb the impact force transmitted to the direction of the medium flow channel 23, thereby reducing the risk of the medium flow channel 23 damaging the leakage.

In some embodiments of the present invention, referring to fig. 5, the elastic buffer member 5 is only abutted between the assembling groove 42 and the bottom guard plate 3, that is, the elastic buffer member 5 is contacted with both the assembling groove 42 of the bottom guard plate 3 and the reinforcing plate 4, so that when the bottom guard plate 3 receives external impact force, the elastic buffer member 5 plays a role of buffering protection rapidly, and the impact force after buffering is transmitted to the assembling groove 42 direction of the reinforcing plate 4, and the elastic buffer member 5 can reduce stress concentration of the bottom guard plate 3 and the reinforcing plate 4, thereby preventing the bottom guard plate 3 and the reinforcing plate 4 from being bent.

In some embodiments of the present invention, the projection area of the reinforcing plate 4 on the first plane is smaller than the projection area of the flow channel plate 22 on the first plane, wherein the first plane is a plane perpendicular to the height direction of the housing body 1, that is, the size of the reinforcing plate 4 can be flexibly selected, the coverage area of the reinforcing plate 4 can be smaller than the surface area of the flow channel plate 22, the reinforcing plate 4 can protect the portion and the peripheral region of the flow channel plate 22 corresponding to the medium flow channel 23, and the protection of the reinforcing plate 4 can be omitted for other regions of the flow channel plate 22, thereby reducing the weight of the reinforcing plate 4, improving the system energy density of the battery pack 100, and improving the process operability of the housing assembly 10, and reducing the cost.

According to another aspect of the present invention, the battery pack 100 comprises the housing assembly 10 of the battery pack 100 of the above embodiment.

According to the utility model discloses battery package 100, reinforcing plate 4 are located between cooling piece 2 and the end backplate 3 and are connected with cooling piece 2, and elastic buffer spare 5 is located between end backplate 3 and the cooling piece 2 to be favorable to promoting the bearing capacity of housing assembly 10 of battery package 100 in cooling piece 2 one side, reduce the risk that cooling piece 2 became invalid, and then be favorable to promoting the security of battery package 100.

According to another aspect of the present invention, the power device includes the battery pack 100 of the above embodiment, wherein the power device may be an electric vehicle.

According to the utility model discloses power device, reinforcing plate 4 is located between cooling part 2 and the end backplate 3 and is connected with cooling part 2, and elastic buffer spare 5 is located between end backplate 3 and the cooling part 2 to be favorable to promoting the bearing capacity of casing assembly 10 of battery package 100 in cooling part 2 one side, reduce the risk that cooling part 2 became invalid, and then be favorable to promoting power device's security.

In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example" or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.

While embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the present invention.

Claims

1. A housing assembly for a battery pack, comprising:

a case main body (1), the case main body (1) being used to mount a battery module (20) of the battery pack;

the cooling piece (2) is arranged on the shell main body (1) and is used for exchanging heat with the battery module (20);

the bottom protection plate (3) is arranged on one side, far away from the shell main body (1), of the cooling piece (2) and is connected with the shell main body (1);

the reinforcing plate (4) is arranged between the cooling part (2) and the bottom protection plate (3) and connected with the cooling part (2);

the elastic buffer piece (5), the elastic buffer piece (5) is arranged between the bottom protection plate (3) and the reinforcing plate (4).

2. A battery pack housing assembly according to claim 1, wherein the reinforcing plate (4) is shaped to fit the surface of the cooling element (2) adjacent to the elastomeric buffer element (5).

3. The battery pack housing assembly according to claim 1 or 2, wherein the cooling member (2) comprises: base plate (21) and runner plate (22), runner plate (22) are located base plate (21) with between reinforcing plate (4), base plate (21) with medium runner (23) is injectd jointly to runner plate (22), runner plate (22) have with first connecting portion (221) that base plate (21) are connected, reinforcing plate (4) have with second connecting portion (41) that first connecting portion (221) are connected.

4. The battery pack case assembly according to claim 3, wherein the second connecting portion (41) is provided in plurality, and a fitting groove (42) is formed between at least two adjacent second connecting portions (41), the fitting groove (42) corresponding to the medium flow path (23).

5. A case assembly of a battery pack according to claim 3, wherein a surface of the backplate (3) adjacent to the cooling member (2) is spaced apart from a surface of the first connecting portion (221) adjacent to the backplate (3) by a distance H1, and the reinforcing plate (4) has a height H2, and satisfies the following relationship: h2 is more than or equal to H1/2.

6. A housing assembly of a battery pack according to claim 3, characterised in that the stiffening plate (4) is of the same material as the flow field plate (22).

7. The case assembly of the battery pack according to claim 3, wherein the elastic buffer member (5) corresponds to the media flow channel (23) in the height direction of the case main body (1).

8. The battery pack housing assembly of claim 4, wherein the elastic buffer (5) is stopped between the mounting groove (42) and the backplate (3).

9. A battery pack, characterized by comprising a housing assembly of the battery pack according to any one of claims 1 to 8.

10. A power plant, characterized by comprising a battery pack according to claim 9.