Battery pack

Abstract

The utility model discloses a battery pack which comprises edge beams, a battery module and a bottom protection piece, and the edge beams define a containing cavity; the battery module is located in the containing cavity and 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 located below the battery module and connected to the edge beam, the bottom protection part comprises a bottom protection plate and a supporting part located above the bottom protection plate, an exhaust channel extending in the first direction is defined in the supporting part, an open hole communicated with the exhaust channel is formed in the supporting part, and the anti-explosion valve and the open hole are oppositely arranged. According to the battery pack disclosed by the utility model, the bottom protection piece is arranged below the battery module and is used for sealing and protecting the battery module, and the battery pack adopts single-layer sealing, so that the number of bottom parts is reduced, and the cost is saved; and the explosion-proof valve of the battery module is communicated with the exhaust channel of the bottom protection piece through the open hole, and high-temperature gas can be exhausted into the exhaust channel through the explosion-proof valve, so that the safety performance of the battery pack is improved.

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 scratches on the bottom, and the explosion-proof valve is susceptible to external impacts. In severe cases, the explosion-proof valve and battery cells in the battery may be deformed or the electrolyte may leak, leading to an internal short circuit in the battery and triggering thermal runaway of the battery. Utility Model Content

[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 a battery module, and the bottom protective member is used to seal and protect the battery module. The battery pack adopts a single-layer seal, which reduces the number of bottom parts and saves costs; and the high-temperature gas in the battery module can be discharged through the exhaust channel of the bottom protective member, thereby improving the safety performance of the battery pack.

[0004] A battery pack according to an embodiment of the utility model includes: side beams, which surround a accommodating cavity; a battery module, which is located in the accommodating 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, which is located below the battery module and connected to the side beams, and the bottom protective member includes a bottom guard plate and a support member located above the bottom guard plate, an exhaust passage extending along a first direction is defined in the support member, an opening connected to the exhaust passage is arranged on the support member, and the explosion-proof valve is arranged opposite to the opening.

[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 is used to seal and protect the battery module. The battery pack adopts a single-layer seal, which reduces the number of bottom components and saves costs; the bottom protective member includes a bottom guard plate and a support member, and the support member defines an exhaust channel extending along a first direction. The explosion-proof valve of the battery module is connected to the exhaust channel through an opening. When the battery module has thermal runaway, the high-temperature gas in the battery module can be discharged into the exhaust channel through the explosion-proof valve, which can improve the safety performance of the battery pack.

[0006] According to some embodiments of the present invention, the support member is provided with two, namely a first support member and a second support member, the first support member and the second support member are spaced apart along a second direction, wherein the first direction is perpendicular to the second direction.

[0007] According to some embodiments of the present invention, the bottom protection member further includes a supporting flat plate located above the bottom guard plate, and in the second direction, the supporting flat plate is located between the first supporting member and the second supporting member.

[0008] According to some embodiments of the utility model, the side beam includes a first side beam, a second side beam, a third side beam and a fourth side beam connected end to end, the first side beam and the third side beam are spaced apart along a second direction, the first side beam is provided with a first groove opening toward the first support member, a portion of the first support member extends into the first groove, the third side beam is provided with a second groove opening toward the second support member, a portion of the second support member extends into the second groove.

[0009] According to some embodiments of the utility model, the exhaust channel defined by the first support member is a first exhaust channel, the exhaust channel defined by the second support member is a second exhaust channel, a third exhaust channel connected to the first exhaust channel is provided in the first side beam, and a fourth exhaust channel connected to the second exhaust channel is provided in the third side beam.

[0010] According to some embodiments of the utility model, a first connecting port is provided on a side of the first support member facing the first side beam, and the first connecting port is used to connect the first exhaust channel and the third exhaust channel; and / or a second connecting port is provided on a side of the second support member facing the third side beam, and the second connecting port is used to connect the second exhaust channel and the fourth exhaust channel.

[0011] According to some embodiments of the utility model, the support member includes a support plate and a support frame, the upper surface of the support plate is coplanar with the upper surface of the support frame, the support plate is connected to one end of the support frame away from the side beam, the support frame is connected to the side beam, and the exhaust channel is defined in the support frame.

[0012] According to some embodiments of the present invention, an insulating layer is provided on the inner surface of the exhaust passage.

[0013] According to some embodiments of the present invention, the support member is an integrally formed member.

[0014] According to some embodiments of the present invention, the battery pack further includes a liquid cooling plate, which is located above the battery module and connected to the side beam.

[0015] According to some embodiments of the present invention, a side of the liquid cooling plate facing away from the battery module has a thermal insulation layer.

[0016] 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

[0017] 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:

[0018] Figure 1 is a schematic diagram of a battery pack according to some embodiments of the utility model;

[0019] Figure 2 yes Figure 1 Exploded view of the battery pack;

[0020] Figure 3 yes Figure 1 Partial exploded view of the battery pack;

[0021] Figure 4 yes Figure 1 A partial exploded view of the battery pack in another direction;

[0022] Figure 5 yes Figure 1 Schematic diagram of the coordination between the middle and bottom protection parts and the side beams;

[0023] Figure 6 yes Figure 5 A top view of the cooperation between the middle and bottom protection parts and the side beams;

[0024] Figure 7 yes Figure 1 Schematic diagram of the middle support member;

[0025] Figure 8 is along Figure 7 Section view along line AA.

[0026] Reference numerals:

[0027] 100. Battery pack;

[0028] 10. side beam; 11. first side beam; 12. second side beam; 13. third side beam; 14. fourth side beam; 15. accommodating cavity;

[0029] 20. Battery module; 21. Battery cell;

[0030] 30. Bottom protection member; 31. Bottom guard plate; 32. Support member; 321. Support frame; 322. Support plate; 323. Exhaust channel; 324. Opening; 33. First support member; 34. Second support member; 35. Support plate;

[0031] 40. Liquid cooling plate;

[0032] 51. First sealing member; 52. Second sealing member. DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] 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.

[0036] Reference below Figure 1-Figure 8 A battery pack 100 according to an embodiment of the present invention is described.

[0037] According to the battery pack 100 of the embodiment of the utility model, it includes a side beam 10, a battery module 20 and a bottom protective member 30. The side beam 10 encloses a accommodating cavity 15, and the battery module 20 is located in the accommodating cavity 15. The bottom protective member 30 is located below the battery module 20 and is connected to the side beam 10. The battery pack 100 also includes a liquid cooling plate 40, which is located above the battery module 20 and is connected to the side beam 10. The bottom protective member 30, the side beam 10 and the liquid cooling plate 40 can enclose the battery module 20 in the accommodating cavity 15 to protect the battery module 20 and block external impact on the battery module 20. The battery pack 100 can also be installed in a vehicle through the side beam 10.

[0038] The bottom protective member 30 is used to seal the bottom of the battery module 20, and the liquid cooling plate 40 is used to seal the top of the battery module 20. A first sealing member 51 is provided between the liquid cooling plate 40 and the side beam 10, and a second sealing member 52 is also provided between the bottom protective member 30 and the side beam 10, which is used to increase the sealing of the battery module 20 by the liquid cooling plate 40, the side beam 10 and the bottom protective member 30. The entire battery pack 100 adopts a single-layer sealing structure, which reduces the number of components and saves costs.

[0039] For example, the upper and lower surfaces of the bottom guard plate 31 are coated with an impact-resistant coating, and the upper and lower surfaces of the support member 32 are coated with an impact-resistant coating, which can be used to improve the impact resistance of the bottom protective member 30, avoid the failure of the bottom seal of the battery pack 100 caused by the bottom of the vehicle, and improve the safety performance of the battery pack 100.

[0040] The battery module 20 has an explosion-proof valve, which is arranged at the bottom of the battery module 20. The bottom protection member 30 includes a bottom protection plate 31 and a support member 32, the support member 32 is located above the bottom protection plate 31, and the support member 32 defines a first direction (for example, refer to the attached Figure 6 The support member 32 is provided with an opening 324, which is connected to the exhaust channel 323, and the explosion-proof valve is arranged opposite to the opening 324. When the battery module 20 has thermal runaway, the high-temperature gas in the battery module 20 can be discharged into the exhaust channel 323 through the explosion-proof valve, which can improve the safety performance of the battery pack 100; and when the bottom of the battery pack 100 is impacted by the outside, the exhaust channel 323 has the ability to absorb the impact force, which can protect the explosion-proof valve, and the bottom protection member 30 can be used to protect the battery module 20, thereby providing safety protection for the entire battery pack 100.

[0041] For example, the battery module 20 includes a plurality of battery cells 21 , each of which has an explosion-proof valve at the bottom, and the support member 32 has a plurality of openings 324 , the number of which is equal to and one-to-one corresponding to the number of the explosion-proof valves.

[0042] According to the battery pack 100 of the embodiment of the utility model, a bottom protective member 30 is arranged under the battery module 20, and the bottom protective member 30 is used to seal and protect the battery module 20. The battery pack 100 adopts a single-layer seal, which reduces the number of bottom components and saves costs; the bottom protective member 30 includes a bottom guard plate 31 and a support member 32, and the support member 32 defines an exhaust channel 323 extending along a first direction. The explosion-proof valve of the battery module 20 is connected to the exhaust channel 323 through an opening 324. When the battery module 20 has a thermal runaway, the high-temperature gas in the battery module 20 can be discharged into the exhaust channel 323 through the explosion-proof valve, which can improve the safety performance of the battery pack 100.

[0043] According to some embodiments of the present invention, referring to Figure 2-Figure 6 The support member 32 includes two first support members 33 and a second support member 34, the first support member 33 and the second support member 34 are arranged along the second direction (for example, see the attached Figure 6 The first support member 33 and the second support member 34 are used to support the battery module 20, which can better support the battery module 20, further improve the anti-extrusion ability of the battery module 20, and can also improve the stability of the battery module 20 installed in the accommodating cavity 15.

[0044] According to some embodiments of the present invention, referring to Figure 3-Figure 6 The bottom protection member 31 further includes a support plate 35 located above the bottom protection member 31. In the second direction, the support plate 35 is located between the first support member 33 and the second support member 34. The support plate 35 is also used to support the battery module 20. The first support member 33 and the second support member 34 are respectively used to support the two ends of the battery module 20, and the support plate 35 is used to support the middle part of the battery module 20. Under the joint action of the first support member 33, the second support member 34 and the support plate 35, the battery module 20 can be better supported, and the anti-extrusion ability of the battery module 20 is further improved.

[0045] According to some embodiments of the present invention, referring to Figure 2-Figure 6 The side beam 10 includes a first side beam 11, a second side beam 12, a third side beam 13 and a fourth side beam 14 connected end to end, the first side beam 11 and the third side beam 13 are spaced apart along the second direction, and a first groove is provided in the first side beam 11 with an opening toward the first support member 33, a portion of the first support member 33 extends into the first groove, and a portion of the first support member 33 is inserted into the first side beam 11, which can increase the connection area between the first support member 33 and the first side beam 11, thereby increasing the structural stability of the first support member 33.

[0046] The third side beam 13 is provided with a second groove opening toward the second support member 34, and part of the second support member 34 extends into the second groove, and part of the second support member 34 is inserted into the third side beam 13, which can increase the connection area between the second support member 34 and the third side beam 13, thereby increasing the structural stability of the second support member 34.

[0047] According to some embodiments of the present invention, referring to Figure 2-Figure 6 The exhaust channel 323 defined by the first support member 33 is a first exhaust channel. A third exhaust channel connected to the first exhaust channel is provided in the first side beam 11. The high-temperature gas in the first exhaust channel can be directly discharged into the third exhaust channel, and the high-temperature gas in the third exhaust channel can be directly discharged into the external environment.

[0048] The exhaust channel 323 defined by the second support member 34 is a second exhaust channel. A fourth exhaust channel connected to the second exhaust channel is provided in the third side beam 13. The high-temperature gas in the second exhaust channel can be directly discharged into the fourth exhaust channel, and the high-temperature gas in the fourth exhaust channel can be directly discharged into the external environment.

[0049] The battery modules 20 are arranged in two rows, one row of battery modules 20 is arranged opposite to the first support member 33, and the other row of battery modules 20 is arranged opposite to the second support member 34. When the battery cell 21 of the battery module 20 located above the first support member 33 has thermal runaway, the high-temperature gas of the battery cell 21 can be discharged into the third exhaust channel through the first exhaust channel, which will not affect the battery modules 20 in the other row, thereby improving the safety of the battery modules 20 in the other row; when the battery cell 21 of the battery module 20 located above the second support member 34 has thermal runaway, the high-temperature gas of the battery cell 21 can be discharged into the fourth exhaust channel through the second exhaust channel, which will not affect the battery modules 20 in the other row, thereby improving the safety of the battery modules 20 in the other row;

[0050] The exhaust passages 323 of the two rows of battery modules 20 are separately arranged and not connected to each other, thereby improving the safety of the battery pack 100 .

[0051] According to some embodiments of the present invention, referring to Figure 2-Figure 8A first connecting port is provided on the side of the first support member 33 facing the first side beam 11. The first connecting port is used to connect the first exhaust channel and the third exhaust channel. By providing the first connecting port, the high-temperature gas in the first exhaust channel can be directly discharged into the third exhaust channel through the first connecting port, avoiding the high-temperature gas in the first exhaust channel from being collected and then discharged into the third exhaust channel, thereby improving the high-temperature gas discharge efficiency in the first exhaust channel. A plurality of first connecting ports can be provided, and the plurality of first connecting ports are arranged at intervals along the first direction. A single first connecting port can also be provided, and the single first connecting port is provided on the entire side wall of the first support member 33 on the side facing the first side beam 11.

[0052] A second connecting port is provided on the side of the second support member 34 facing the third side beam 13, and the second connecting port is used to connect the second exhaust channel and the fourth exhaust channel. By providing the second connecting port, the high-temperature gas in the second exhaust channel can be directly discharged into the fourth exhaust channel through the second connecting port, avoiding the high-temperature gas in the second exhaust channel from being collected and then discharged into the fourth exhaust channel, thereby improving the high-temperature gas discharge efficiency in the second exhaust channel. A plurality of second connecting ports can be provided, and the plurality of second connecting ports are arranged at intervals along the first direction, or a single second connecting port can be provided, and the single second connecting port is provided on the entire side wall of the side of the second support member 34 facing the third side beam 13.

[0053] According to some embodiments of the present invention, referring to 7- Figure 8 The support member 32 includes a support plate 322 and a support frame 321. The upper surface of the support plate 322 is coplanar with the upper surface of the support frame 321. The support plate 322 is connected to an end of the support frame 321 away from the side beam 10. The support frame 321 is connected to the side beam 10. The exhaust passage 323 is defined in the support frame 321. Figure 8 In a specific embodiment, the lower surface of the support plate 322 is higher than the lower surface of the support frame 321. Setting the support plate 322 as a flat structure can not only reduce the weight of the support member 32 and reduce the cost; the support plate 322 and the upper surface are coplanar with the upper surface of the support frame 321, and can also provide better support for the battery module 20.

[0054] According to some embodiments of the present invention, referring to Figure 2-Figure 8 The inner surface of the exhaust channel 323 is provided with an insulating layer to prevent the high-temperature gas and other conductive impurities in the exhaust channel 323 from conducting electricity with the support member 32. The insulating layer is also filled with a fireproof material. The high-temperature gas in the exhaust channel 323 is too hot, and the heat is transferred to the support member 32, causing the temperature of the support member 32 to be too high. The fireproof layer is coated on the inner surface of the exhaust channel 323 to prevent the support member 32 from catching fire and other problems.

[0055] According to some embodiments of the present invention, referring to Figure 2-Figure 8 The support member 32 is an integrally formed member, which can make the support member structure stable, high in structural strength, and simple in processing. For example, the connection process between the support plate 322 and the support frame 321 can be omitted, and the support plate 322 and the support frame 321 can be manufactured by an integral forming process such as forging or die casting.

[0056] According to some embodiments of the present invention, referring to Figure 1-Figure 2 The battery pack 100 further includes a liquid cooling plate 40, which is located above the battery module 20 and connected to the side beam 10. The liquid cooling plate 40 can be used to adjust the temperature of the battery module 20. The liquid cooling plate 40 is located above the battery module 20, and the explosion-proof valve is located at the bottom of the battery module 20, which can achieve thermal and electrical separation and further improve the safety of the battery pack 100.

[0057] According to some embodiments of the present invention, referring to Figure 1-Figure 2 The liquid cooling plate 40 has a heat preservation layer on one side away from the battery module 20. The heat preservation layer is coated on the upper surface of the liquid cooling plate 40, replacing the traditional heat preservation cotton structure, improving the heat preservation performance of the battery pack 100, and reducing the Z direction of the battery pack 100 (for example, refer to the attached Figure 2 The space in the up and down directions is increased, thereby improving the space utilization of the battery pack 100.

[0058] 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.

[0059] 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: Side beams, wherein the side beams surround a receiving cavity; A battery module, 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 located below the battery module and connected to the side beam, the bottom protective member includes a bottom guard plate and a support member located above the bottom guard plate, an exhaust passage extending along a first direction is defined in the support member, an opening connected to the exhaust passage is provided on the support member, and the explosion-proof valve is arranged opposite to the opening.

2. The battery pack according to claim 1, characterized in that: The support member includes two members, namely a first support member and a second support member, wherein the first support member and the second support member are spaced apart along a second direction, wherein the first direction is perpendicular to the second direction.

3. The battery pack according to claim 2, characterized in that: The bottom protection member further includes a supporting plate located above the bottom guard plate, and in the second direction, the supporting plate is located between the first support member and the second support member.

4. The battery pack according to claim 2, characterized in that: The side beam includes a first side beam, a second side beam, a third side beam and a fourth side beam connected end to end, the first side beam and the third side beam are spaced apart along a second direction, the first side beam is provided with a first groove opening toward the first support member, a portion of the first support member extends into the first groove, the third side beam is provided with a second groove opening toward the second support member, a portion of the second support member extends into the second groove.

5. The battery pack according to claim 4, characterized in that: The exhaust channel defined by the first support member is a first exhaust channel, the exhaust channel defined by the second support member is a second exhaust channel, a third exhaust channel connected to the first exhaust channel is provided in the first side beam, and a fourth exhaust channel connected to the second exhaust channel is provided in the third side beam.

6. The battery pack according to claim 5, characterized in that: A first connecting port is provided on a side of the first support member facing the first side beam, and the first connecting port is used to connect the first exhaust channel and the third exhaust channel; and / or a second connecting port is provided on a side of the second support member facing the third side beam, and the second connecting port is used to connect the second exhaust channel and the fourth exhaust channel.

7. The battery pack according to claim 1, characterized in that: The support member includes a support plate and a support frame, the upper surface of the support plate is coplanar with the upper surface of the support frame, the support plate is connected to an end of the support frame away from the side beam, the support frame is connected to the side beam, and the exhaust channel is defined in the support frame.

8. The battery pack according to claim 1, characterized in that: An insulating layer is provided on the inner surface of the exhaust passage.

9. The battery pack according to claim 1, characterized in that: The support member is an integrally formed member.

10. The battery pack according to claim 1, characterized in that: It also includes a liquid cooling plate, which is located above the battery module and connected to the side beam. The liquid cooling plate has a heat preservation layer on a side away from the battery module.

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