Battery pack

Abstract

The utility model discloses a battery pack which comprises a battery module, an edge beam and a bottom protection piece, a containing cavity is defined in the edge beam, the battery module is located in the containing cavity, the battery module is provided with an anti-explosion valve, and the anti-explosion valve is arranged at the bottom of the battery module; the bottom protection part is connected to the edge beam and located below the battery module, the bottom protection part comprises a bottom protection plate and a supporting plate installed above the bottom protection plate, a first exhaust channel extending in the first direction is defined by the supporting plate, and the anti-explosion valve is opposite to the first exhaust channel. According to the battery pack disclosed by the embodiment of the utility model, the bottom protection piece is arranged below the battery module, and when the battery pack is subjected to thermal runaway, gas can be exhausted into the first exhaust channel through the anti-explosion valve, so that the safety performance of the battery pack can be improved; and when the bottom of the battery pack is impacted by the outside, the first exhaust channel has the capability of absorbing impact force and can protect the anti-explosion valve, so that the battery module is protected, and the safety protection of the whole battery pack can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pack. Background Art

[0002] In related technologies, batteries are generally installed at the bottom of the vehicle body, and the explosion-proof valve of the battery pack is inverted at the bottom of the battery module. When the vehicle passes through a road with obstacles, the battery is prone to hit the bottom and the bottom is scratched. In addition, there are no crossbeams and longitudinal beams in the entire battery pack, and the explosion-proof valve is easily impacted by the outside world. In severe cases, the explosion-proof valve and battery cells in the battery may be deformed or the coolant may leak, which may lead to an internal short circuit in the battery and trigger thermal runaway of the battery. Summary of the invention

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a battery pack, wherein a bottom protective member is arranged below the battery module, and the bottom protective member can protect the explosion-proof valve, and further can be used to protect the battery module, thereby providing safety protection for the entire battery pack.

[0004] According to the battery pack of the embodiment of the utility model, it includes: a battery module; a side beam, wherein a accommodating cavity is defined in the side beam, the battery module is located in the accommodating cavity, the battery module has an explosion-proof valve, and the explosion-proof valve is arranged at the bottom of the battery module; a bottom protective member, the bottom protective member is connected to the side beam and is located below the battery module, the bottom protective member includes a bottom guard plate and a support plate installed above the bottom guard plate, the support plate defines a first exhaust channel extending along a first direction, and the explosion-proof valve is opposite to the first exhaust channel.

[0005] According to the battery pack of the embodiment of the utility model, a bottom protective member is arranged under the battery module, and the bottom protective member includes a bottom guard plate and a support plate, and the support plate defines a first exhaust channel extending along a first direction. The explosion-proof valve of the battery module is opposite to the first exhaust channel. When thermal runaway occurs in the battery module, the high-temperature gas in the battery module can be discharged into the first exhaust channel through the explosion-proof valve, thereby improving the safety performance of the battery pack; and when the bottom of the battery pack is impacted by the outside world, the first exhaust channel has the ability to absorb the impact force, and can protect the explosion-proof valve. The bottom protective member can be used to protect the battery module, and then the entire battery pack can be safely protected.

[0006] According to some embodiments of the utility model, the support plate includes a plurality of first support plates, the plurality of first support plates are spaced apart along a second direction, and the first exhaust channel is constructed between two adjacent first support plates, wherein the second direction is perpendicular to the first direction.

[0007] According to some embodiments of the present invention, the support plate further includes a plurality of second support plates, wherein the second support plates are connected to the pool module, the second support plates are connected between two adjacent first support plates, and the second support plates are abutted against the bottom guard plate.

[0008] According to some embodiments of the utility model, a connecting inclined plate is connected between the first support plate and the second support plate, an exhaust hole is formed on the connecting inclined plate, a groove opening toward the bottom guard plate is defined in the first support plate and between the two connecting inclined plates, the groove extends along the first direction, a second exhaust channel is constructed between the groove and the bottom guard plate, and the exhaust hole is used to connect the first exhaust channel and the second exhaust channel.

[0009] According to some embodiments of the present invention, the bottom protective member further includes a first buffer member, which is located in the groove and spaced apart from the connecting inclined plate.

[0010] According to some embodiments of the utility model, an upper cold plate assembly is also included, which is connected to the side beam and is located above the battery module. The upper cold plate assembly includes a liquid cooling plate, a first reinforcement and a second reinforcement. The first reinforcement and the second reinforcement are respectively located on the upper and lower sides of the liquid cooling plate and are both fixedly connected to the liquid cooling plate.

[0011] According to some embodiments of the utility model, the first reinforcement is an annular reinforcement and is connected to the outer peripheral side of the liquid cooling plate; the second reinforcement is connected between the liquid cooling plate and the side beam, the second reinforcement includes a reinforcement body and a flange, one side of the reinforcement body is connected to the liquid cooling plate, and the other side is connected to one side of the flange, and the other side of the flange is folded in a direction perpendicular to the reinforcement body and connected to the side beam.

[0012] According to some embodiments of the present invention, the battery pack also includes a lower cold plate assembly, which is arranged between the battery module and the bottom protective member and includes a plurality of lower cold plates, wherein the plurality of lower cold plates extend along the first direction and are arranged at intervals along the second direction.

[0013] According to some embodiments of the present invention, at least one window penetrating the lower cold plate along the thickness direction of the lower cold plate is formed on the lower cold plate, and the window extends along the first direction, and the window is used to avoid the explosion-proof valve.

[0014] According to some embodiments of the present invention, the battery pack further includes a second buffer component, a hollow cavity is formed in the side beam, and the second buffer component is filled in the hollow cavity.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 is an exploded view of a battery pack according to some embodiments of the present utility model;

[0018] Figure 2 yes Figure 1 An exploded view of part of the battery pack structure;

[0019] Figure 3 yes Figure 1 A top view of the battery pack in FIG.

[0020] Figure 4 yes Figure 3 Sectional view along line AA;

[0021] Figure 5 yes Figure 1 Exploded view of the side beam and bottom protection parts;

[0022] Figure 6 is an exploded view of a liquid cooling plate, a battery module and a support plate according to some embodiments of the utility model;

[0023] Figure 7 is an exploded view of a liquid cooling plate, a battery module and a support plate according to other embodiments of the utility model;

[0024] Figure 8 is an exploded view of a liquid cooling plate, a battery module and a lower cooling plate according to some embodiments of the utility model;

[0025] Fig. 9 is a schematic diagram of a support plate according to some embodiments of the utility model;

[0026] Fig.10 Schematic diagram of a support plate according to other embodiments of the utility model;

[0027] Fig.11 is a schematic diagram of a liquid cooling plate according to some embodiments of the present utility model;

[0028] Fig.12 is a schematic diagram of a lower cold plate according to some embodiments of the utility model;

[0029] Fig.13 is a schematic diagram of a lower cold plate according to other embodiments of the utility model;

[0030] Fig.14 Schematic diagram of a lower cold plate according to some other embodiments of the utility model.

[0031] Reference numerals:

[0032] 100. Battery pack;

[0033] 10. Battery module;

[0034] 20. side beam; 21. accommodating cavity; 22. second buffer member; 23. hollow cavity;

[0035] 30. Bottom protection member; 31. Bottom guard plate; 32. Support plate; 321. First support plate; 322. Second support plate; 323. Connecting inclined plate; 324. Exhaust hole; 325. First exhaust channel; 326. Groove; 327. Second exhaust channel; 33. First buffer member;

[0036] 40. upper cold plate assembly; 41. liquid cold plate; 42. first reinforcement member; 43. second reinforcement member; 431. reinforcement member body; 432. flange;

[0037] 50. lower cold plate assembly; 51. lower cold plate; 52. window;

[0038] 61. Thermal conductive adhesive; 62. Structural adhesive. DETAILED DESCRIPTION

[0039] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0040] In the description of the present utility model, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0041] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0042] Reference below Figure 1-Figure 14 A battery pack 100 according to an embodiment of the present invention is described.

[0043] Reference Figure 1-Figure 14 The battery pack 100 of the utility model embodiment includes a battery module 10, a side beam 20 and a bottom protective member 30. The side beam 20 defines a receiving cavity 21. The battery module 10 is located in the receiving cavity 21. The side beam 20 can be used to protect the battery module 10 and block external impact on the battery module 10. The battery pack 100 can also be installed in the vehicle through the side beam 20.

[0044] The battery module 10 has an explosion-proof valve, which is arranged at the bottom of the battery module 10. The bottom protective member 30 is connected to the side beam 20 and is located below the battery module 10. The bottom protective member 30 can be used to protect the battery module 10 and the explosion-proof valve. For example, the battery module 10 can be fixed to the bottom protective member 30 by structural adhesive 62 to prevent the battery module 10 from shaking in the accommodating cavity 21. The bottom protective member 30 includes a bottom guard plate 31 and a support plate 32. The support plate 32 is installed above the bottom guard plate 31. The support plate 32 can support and lift the battery module 10, and can improve the anti-extrusion ability of the battery module 10. Specifically, the battery module 10 can be fixed to the support plate 32 by structural adhesive 62, and the bottom guard plate 31 can be fixed to the side beam 20 by bolts. For example, the bottom guard plate 31 can be made of materials such as HC340 / 590DP high-strength steel or hot-formed steel.

[0045] The support plate 32 defines a first direction (eg, referring to Figure 1 The first exhaust channel 325 extends in the direction of e1 shown in the figure, and the explosion-proof valve is opposite to the first exhaust channel 325. When the battery pack 100 has thermal runaway, the high-temperature gas in the battery module 10 can be discharged from the explosion-proof valve into the first exhaust channel 325, and the high-temperature gas in the first exhaust channel 325 can be discharged into the external environment, which can improve the safety performance of the battery pack 100. When the bottom of the battery pack 100 is impacted by the outside world, the bottom guard plate 31 can be used to protect the battery module 10, and the first exhaust channel 325 has the ability to absorb impact force, which can protect the explosion-proof valve, and then the entire battery pack 100 can be safely protected.

[0046] According to the battery pack 100 of the embodiment of the utility model, a bottom protective member 30 is arranged under the battery module 10, and the bottom protective member 30 includes a bottom guard plate 31 and a support plate 32. The support plate 32 defines a first exhaust channel 325 extending along a first direction. The explosion-proof valve of the battery module 10 is opposite to the first exhaust channel 325. When the battery module 10 has a thermal runaway, the high-temperature gas in the battery module 10 can be discharged into the first exhaust channel 325 through the explosion-proof valve, thereby improving the safety performance of the battery pack 100. When the bottom of the battery pack 100 is impacted by the outside world, the first exhaust channel 325 has the ability to absorb the impact force, thereby protecting the explosion-proof valve. The bottom protective member 30 can be used to protect the battery module 10, thereby providing safety protection for the entire battery pack 100.

[0047] According to some embodiments of the present invention, referring to Figure 1-Figure 10 The support plate 32 includes a plurality of first support plates 321, and the plurality of first support plates 321 are arranged along the second direction (for example, referring to Figure 1 The multiple support plates 32 are spaced apart (in the direction e2 shown in the figure), so that the force of supporting and lifting the battery module 10 by the multiple support plates 32 is more balanced. The multiple support plates 32 can better support and lift the battery module 10, further improve the anti-extrusion ability of the battery module 10, and also improve the stability of the battery module 10 installed in the accommodating cavity 21.

[0048] A first exhaust channel 325 is constructed between two adjacent first support plates 321, wherein the second direction is perpendicular to the first direction, and multiple first exhaust channels 325 can be constructed between multiple first support plates 321, and there is no component blocking the multiple first exhaust channels 325. When thermal runaway occurs in the battery pack 100, the high-temperature gas in the battery module 10 can be discharged into the first exhaust channel 325 through the explosion-proof valve, and there is no obstruction in the first exhaust channel 325, so that the battery module 10 is exhausted more smoothly, the exhaust rate of the battery module 10 is increased, and the safety performance of the battery pack 100 can be improved.

[0049] According to some embodiments of the present invention, referring to Figure 1-Figure 10 The support plate 32 further includes a plurality of second support plates 322, which are spaced apart from the battery module 10 in the vertical direction, and are connected between two adjacent first support plates 321, and the second support plates 322 abut against the bottom guard plate 31, that is, the second support plates 322 are located in the first exhaust passage 325. When the bottom of the battery pack 100 is impacted by the outside world, the second support plates 322 and the bottom guard plate 31 work together to further improve the protection capability of the bottom guard 30.

[0050] According to some embodiments of the present invention, referring to Figure 1-Figure 10A connecting inclined plate 323 is connected between the first support plate 321 and the second support plate 322, and an exhaust hole 324 is formed on the connecting inclined plate 323. A groove 326 opening toward the bottom guard plate 31 is defined between the first support plate 321 and the two connecting inclined plates 323, and the groove 326 extends along the first direction. A second exhaust channel 327 is constructed between the groove 326 and the bottom guard plate 31, and the exhaust hole 324 is used to connect the first exhaust channel 325 and the second exhaust channel 327. When the battery pack 100 has thermal runaway, the high-temperature gas in the battery module 10 is discharged from the explosion-proof valve into the first exhaust channel 325, and the high-temperature gas from the first exhaust channel 325 can be discharged into the second exhaust channel 327 through the exhaust hole 324, which can improve the exhaust efficiency of the high-temperature gas and further improve the safety performance of the battery pack 100.

[0051] According to some embodiments of the present invention, referring to Figure 1-Figure 5 The bottom protection member 30 further includes a first buffer member 33, which is located in the groove 326 and is spaced apart from the connecting inclined plate 323. When the bottom of the battery pack 100 is impacted by the outside, the first buffer member 33 can effectively absorb the impact force, and the cooperation between the first buffer member 33 and the bottom protection member 30 can further improve the safety of the battery module 10.

[0052] For example, the first buffer member 33 may be made of a structure such as MPP square microporous foam or PP interlayer.

[0053] According to some embodiments of the present invention, referring to Figure 1-Figure 4 The battery pack 100 further includes an upper cold plate assembly 40, which is connected to the side beam 20 and is located above the battery module 10. The upper cold plate assembly 40 includes a liquid cold plate 41, a first reinforcement 42 and a second reinforcement 43, the first reinforcement 42 and the second reinforcement 43 are respectively located at the upper and lower sides of the liquid cold plate 41, and the first reinforcement 42 and the second reinforcement 43 are both fixedly connected to the liquid cold plate 41, and the first reinforcement 42 and the second reinforcement 43 can increase the structural strength of the liquid cold plate 41, and can improve the overall rigidity of the battery pack 100.

[0054] The liquid cooling plate 41 can be used to adjust the temperature of the battery module 10. When the temperature of the battery module 10 is high, the liquid cooling plate 41 can dissipate heat from the battery module 10. When the temperature of the battery module 10 is low, the liquid cooling plate 41 can heat the battery module 10 to increase the energy density of the battery module 10.

[0055] For example, the liquid cooling plate 41 may be fixed to the top of the battery module 10 using a thermal conductive adhesive 61, and the liquid cooling plate 41 may be fixed to the side beam 20 using bolts, thereby ensuring the stability of the liquid cooling plate 41 being fixed to the side beam 20. The thermal conductive adhesive 61 may increase the rate at which the heat or cold of the liquid cooling plate 41 is transferred to the battery module 10, thereby increasing the heat transfer efficiency of the liquid cooling plate 41.

[0056] According to some embodiments of the present invention, referring to Figure 1-Figure 4 The first reinforcement member 42 is an annular reinforcement member and is connected to the outer peripheral side of the liquid cooling plate 41. It can not only strengthen the outer peripheral side of the liquid cooling plate 41, but also does not affect the ability of the liquid cooling plate 41 to heat or dissipate heat to the battery module 10. For example, the first reinforcement member 42 can be fixed to the liquid cooling plate 41 by bolts.

[0057] The second reinforcement 43 is connected between the liquid cooling plate 41 and the side beam 20. The second reinforcement 43 includes a reinforcement body 431 and a flange 432. One side of the reinforcement body 431 is connected to the liquid cooling plate 41, and the other side of the reinforcement body 431 is connected to one side of the flange 432. The other side of the flange 432 is folded in a direction perpendicular to the reinforcement body 431, and the flange 432 is connected to the side beam 20. The second reinforcement 43 can increase the structural strength of the connection between the liquid cooling plate 41 and the side beam 20.

[0058] For example, two second reinforcement members 43 are provided, and the two second reinforcement members 43 are respectively located at two sides of the liquid cooling plate 41 in the second direction.

[0059] According to some embodiments of the present invention, referring to Figure 8 , Figure 12-14 The battery pack 100 also includes a lower cold plate assembly 50, which is disposed between the battery module 10 and the bottom protective member 30. The lower cold plate assembly 50 includes a plurality of lower cold plates 51, which extend along the first direction and are arranged at intervals along the second direction. The lower cold plate 51 can dissipate heat or heat the battery module 10. The lower cold plate 51 and the liquid cold plate 41 can improve the heat dissipation efficiency of the battery module 10 under the joint action. Optionally, the liquid cold plate 41 and the lower cold plate 51 can have the same structure.

[0060] For example, the lower cold plate 51 may be a cold pipe, and the cold pipe may play a role in supporting the battery module 10 .

[0061] According to some embodiments of the present invention, referring to Figure 8 , Figure 12-14At least one window 52 is formed on the lower cold plate 51 and penetrates the lower cold plate 51 along the thickness direction of the lower cold plate 51. One window 52 may be formed on the lower cold plate 51, or multiple windows 52 may be formed on the lower cold plate 51. The window 52 extends along the first direction, and the window 52 is used to avoid the explosion-proof valve. In order to meet the cooling requirements under different working conditions, while considering the requirements of lightweight and integration, one or more lower cold plates 51 may be provided below the battery module 10, and one or more windows 52 may be opened on the lower cold plate 51.

[0062] According to some embodiments of the present invention, referring to Figure 1-Figure 4 The battery pack 100 also includes a second buffer member 22. A hollow cavity 23 is formed in the side beam 20. The second buffer member 22 fills the hollow cavity 23. When the battery pack 100 is hit from the side, the first buffer member 33 can play a buffering role, which can reduce the impact force on the battery module 10, thereby improving the side collision performance of the entire vehicle.

[0063] For example, the second buffer member 22 may be made of foamed aluminum, PP sandwich honeycomb structure, highly elastic rubber or liquid.

[0064] In the description of this specification, the description with reference to the terms "some embodiments", "optionally", "further" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0065] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: include: Battery module; A side beam, wherein a receiving cavity is defined in the side beam, the battery module is located in the receiving cavity, and the battery module has an explosion-proof valve, and the explosion-proof valve is arranged at the bottom of the battery module; A bottom protective member, wherein the bottom protective member is connected to the side beam and is located below the battery module, wherein the bottom protective member includes a bottom guard plate and a support plate installed above the bottom guard plate, wherein the support plate defines a first exhaust channel extending along a first direction, and the explosion-proof valve is opposite to the first exhaust channel.

2. The battery pack according to claim 1, characterized in that: The support plate includes a plurality of first support plates, which are spaced apart along a second direction, and the first exhaust channel is constructed between two adjacent first support plates, wherein the second direction is perpendicular to the first direction.

3. The battery pack according to claim 2, characterized in that: The support plate also includes a plurality of second support plates, the second support plates are spaced apart from the pool module in the up-down direction, the second support plates are connected between two adjacent first support plates, and the second support plates are in contact with the bottom guard plate.

4. The battery pack according to claim 3, characterized in that: A connecting inclined plate is connected between the first support plate and the second support plate, and an exhaust hole is formed on the connecting inclined plate. A groove opening toward the bottom guard plate is defined in the first support plate and between the two connecting inclined plates, and the groove extends along the first direction. A second exhaust channel is constructed between the groove and the bottom guard plate, and the exhaust hole is used to connect the first exhaust channel and the second exhaust channel.

5. The battery pack according to claim 4, characterized in that: The bottom protection member further includes a first buffer member, which is located in the groove and is spaced apart from the connecting inclined plate.

6. The battery pack according to claim 1, characterized in that: It also includes an upper cold plate assembly, which is connected to the side beam and is located above the battery module. The upper cold plate assembly includes a liquid cooling plate, a first reinforcement and a second reinforcement. The first reinforcement and the second reinforcement are respectively located on the upper and lower sides of the liquid cooling plate and are both fixedly connected to the liquid cooling plate.

7. The battery pack according to claim 6, characterized in that: The first reinforcement is an annular reinforcement and is connected to the outer peripheral side of the liquid cooling plate; the second reinforcement is connected between the liquid cooling plate and the side beam, the second reinforcement includes a reinforcement body and a flange, one side of the reinforcement body is connected to the liquid cooling plate, and the other side is connected to one side of the flange, and the other side of the flange is folded in a direction perpendicular to the reinforcement body and connected to the side beam.

8. The battery pack according to claim 1, characterized in that: It also includes a lower cold plate assembly, which is arranged between the battery module and the bottom protective member and includes a plurality of lower cold plates, wherein the plurality of lower cold plates extend along the first direction and are arranged at intervals along the second direction.

9. The battery pack according to claim 8, characterized in that: At least one window is formed on the lower cold plate and penetrates the lower cold plate along the thickness direction of the lower cold plate. The window extends along the first direction and is used to avoid the explosion-proof valve.

10. The battery pack according to claim 1, characterized in that: A second buffer component is also included. A hollow cavity is formed in the side beam, and the second buffer component is filled in the hollow cavity.

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