CN220652235U - Battery pack - Google Patents

Abstract

The utility model discloses a battery pack, which comprises: the battery box body is internally provided with a battery module, and the bottom of the battery module is provided with an explosion-proof valve; the bottom guard plate assembly comprises a liquid cooling plate and a bottom guard plate assembly, the liquid cooling plate is arranged at the bottom of the battery module, the bottom guard plate assembly is connected to the bottom of the battery box body and supported at the bottom of the liquid cooling plate, the liquid cooling plate is provided with a cooling flow passage and an avoidance groove, the avoidance groove is opposite to the explosion-proof valve, and the bottom guard plate assembly is provided with an exhaust passage communicated with the avoidance groove. According to the battery pack disclosed by the embodiment of the utility model, the bottom guard plate assembly and the liquid cooling plate are arranged at the bottom of the battery box body, so that the protection effect on the battery module arranged in the battery pack is improved, the use safety of the battery pack is ensured, the use effect is better, and the application range is wider.

Description

Battery pack

Technical Field

The utility model relates to the technical field of battery pack manufacturing, in particular to a battery pack.

Background

Various complex working conditions can be met in the running process of the electric vehicle. In order to improve the capability of the battery pack to cope with various working conditions, the structural strength of the battery pack must be improved, and the design mode of the battery pack structure directly affects the overall safety performance of the battery pack. With the attention of safety performance and energy, the safety performance of the battery pack is increasingly important; with the development of new technology and new technology, the structure forms of the battery pack are also diversified; and with the continuous improvement of the energy density of the battery pack, the high-integration battery pack structure is particularly important.

The existing battery packs are various in arrangement form, basically, the electrode column of the battery core is upward, and the explosion-proof valve is upward; or the electrode column of the electric core faces one side or two sides, and the explosion-proof valve and the electrode column are on the same side; the arrangement mode of the battery cells is relatively common, but the protection performance of the battery pack to the battery cells is poor, and there is room for improvement.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the battery pack, which can improve the protection effect on the battery module and ensure the use safety of the battery pack.

According to an embodiment of the present utility model, a battery pack includes: the battery box body is internally provided with a battery module, and the bottom of the battery module is provided with an explosion-proof valve; the bottom guard plate assembly comprises a liquid cooling plate and a bottom guard plate assembly, the liquid cooling plate is arranged at the bottom of the battery module, the bottom guard plate assembly is connected to the bottom of the battery box body and supported at the bottom of the liquid cooling plate, the liquid cooling plate is provided with a cooling flow passage and an avoidance groove, the avoidance groove is opposite to the explosion-proof valve, and the bottom guard plate assembly is provided with an exhaust passage communicated with the avoidance groove.

According to the battery pack disclosed by the embodiment of the utility model, the bottom of the battery box body is provided with the bottom guard plate assembly and the liquid cooling plate, so that the protection effect on the battery module arranged in the battery pack is improved, the use safety of the battery pack is ensured, the use effect is better, and the application range is wider.

According to some embodiments of the utility model, the liquid cooling plate comprises a bottom plate part and a side plate part, the bottom plate part and the side plate part are connected in a bending way and are provided with the cooling flow channels, the bottom plate part is positioned at the bottom of the battery module, and the side plate part is positioned at the side part of the battery module.

According to the battery pack of some embodiments of the present utility model, the cooling flow passage includes a first flow passage and a second flow passage, an extending direction of the first flow passage intersects an extending direction of the second flow passage, the first flow passage is provided at the bottom plate portion, and a part of the second flow passage is provided at the bottom plate portion and another part is provided at the side plate portion.

According to some embodiments of the utility model, the relief grooves are spaced apart from the first flow path in parallel.

According to some embodiments of the utility model, a first heat-conducting structural adhesive is arranged between the bottom plate part and the battery module;

and/or the side part of the battery module is provided with a pole, the pole is connected with a busbar, and a second heat conduction structural adhesive is arranged between the side plate part and the busbar.

According to the battery pack of some embodiments of the present utility model, the liquid cooling plate is provided with an avoidance hole and a communication hole, the avoidance hole is opposite to the explosion-proof valve, the avoidance hole and the communication hole are respectively communicated with the avoidance groove, and the avoidance groove is communicated with the exhaust channel through the communication hole.

According to the battery pack of some embodiments of the present utility model, the explosion-proof valves of each battery module are multiple, the avoidance holes are multiple and correspond to the explosion-proof valves one by one, and the avoidance holes are distributed at intervals along the extending direction of the avoidance groove.

According to some embodiments of the utility model, the bottom shield assembly further includes a buffer chamber spaced from the vent passage.

According to some embodiments of the utility model, the bottom guard plate assembly is provided with a buffer member between the liquid cooling plate and the area where the buffer chamber is located.

According to the battery pack of some embodiments of the present utility model, the battery modules and the liquid cooling plates are all plural and in one-to-one correspondence;

the buffer cavity comprises a side buffer cavity and a middle buffer cavity, wherein the side buffer cavity is positioned at the bottom of the battery module, and the middle buffer cavity is positioned at the bottom of the joint of two adjacent battery modules.

Additional aspects and advantages of the utility model 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 utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 is an exploded view of a battery pack according to an embodiment of the present utility model;

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

fig. 3 is a schematic view of a liquid cooling plate according to an embodiment of the present utility model;

FIG. 4 is a schematic structural view of a bottom shield assembly according to an embodiment of the present utility model.

Reference numerals:

the battery pack 100 is provided with a battery pack,

the battery box body 1, the upper cover plate 2, the structural adhesive 3, the battery module 4, the pole 41, the busbar 42, the explosion-proof valve 5, the first heat conduction structural adhesive 6, the second heat conduction structural adhesive 7,

the liquid cooling plate 8, the bottom plate portion 81, the side plate portion 82, the first flow passage 831, the second flow passage 832, the escape groove 84, the escape hole 85, the communication hole 86,

the bottom shield assembly 9, the buffer chamber 91, the exhaust passage 92, and the buffer 93.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The following describes a battery pack 100 according to an embodiment of the present utility model with reference to fig. 1 to 4, which can improve the protection effect on the battery module 4 and ensure the use safety of the battery pack 100.

As shown in fig. 1 to 4, a battery pack 100 according to an embodiment of the present utility model includes: battery case 1 and bottom shield assembly.

Be equipped with battery module 4 in the battery box 1, the bottom of battery module 4 is equipped with explosion-proof valve 5, and end backplate assembly includes liquid cooling board 8 and end backplate subassembly 9, and liquid cooling board 8 is installed in the bottom of battery module 4, and end backplate subassembly 9 are connected in the bottom of battery box 1 and are supported in the bottom of liquid cooling board 8, and liquid cooling board 8 is equipped with the cooling runner and dodges groove 84, dodges groove 84 and explosion-proof valve 5 just right, and end backplate subassembly 9 is equipped with the exhaust passage 92 with dodging groove 84 intercommunication.

Specifically, the battery pack 100 is provided with the battery box 1, the battery box 1 plays a supporting and protecting role to the internal structure of the battery pack 100, the battery module 4 is arranged in the battery box 1, the explosion-proof valve 5 is arranged at the bottom of the battery module 4, the explosion-proof valve 5 is arranged in a plurality, the explosion-proof valve 5 is used for automatically opening the valve when the battery module 4 is over-pressed or the temperature is too high, the high-pressure gas in the battery pack 100 is directly dispersed, and thus explosion prevention is carried out, the upper cover plate 2 is arranged at the top of the battery module 4, and the upper cover plate 2 is connected with the battery module 4 through the structural adhesive 3 so as to protect the top of the battery module 4.

Further, the battery pack 100 is further provided with a bottom guard plate assembly, the bottom guard plate assembly comprises a liquid cooling plate 8 and a bottom guard plate assembly 9, the liquid cooling plate 8 is arranged at the bottom of the battery module 4, the battery module 4 can be protected and supported, a cooling flow passage is arranged in the liquid cooling plate 8, the cooling flow passage can be used for cooling the battery module 4, the battery module 4 is guaranteed to be balanced in temperature under the working conditions of normal charging, quick charging and the like, the safe state of the battery pack 100 is guaranteed, the battery module 4 can be quickly heated, the temperature balance of the battery module 4 can be realized when the battery module 4 is warmed, the liquid cooling plate 8 is further provided with an avoidance groove 84, the avoidance groove 84 is opposite to the explosion-proof valve 5, and the liquid cooling plate is opened towards the explosion-proof valve 5, so that high-pressure gas in the battery pack 100 can be exhausted along the avoidance groove 84.

Meanwhile, the bottom guard plate assembly 9 is connected to the bottom of the battery box 1 and supported to the bottom of the liquid cooling plate 8, the bottom guard plate assembly 9 can be set to be HC/DP high-strength steel or formed steel and the like, so that the bottom guard plate assembly 9 has higher strength, deformation and the like can be avoided when the battery pack 100 is impacted to protect the explosion-proof valve 5, the battery module 4 and the like, the bottom guard plate assembly 9 is provided with an exhaust channel 92 communicated with the avoidance groove 84, high-pressure gas in the battery pack 100 is exhausted to the exhaust channel 92 through the avoidance groove 84, and then the high-pressure gas is exhausted out of the battery pack 100, and the use safety of the battery pack 100 is guaranteed.

According to the battery pack 100 provided by the embodiment of the utility model, the bottom guard plate assembly and the liquid cooling plate 8 are arranged at the bottom of the battery box body 1, so that the protection effect on the battery module 4 arranged in the battery pack 100 is improved, the use safety of the battery pack 100 is ensured, the use effect is better, and the application range is wider.

In some embodiments, the liquid cooling plate 8 includes a bottom plate portion 81 and a side plate portion 82, the bottom plate portion 81 and the side plate portion 82 are bent and connected and are each provided with a cooling flow passage, the bottom plate portion 81 is located at the bottom of the battery module 4, and the side plate portion 82 is located at the side of the battery module 4.

Specifically, as shown in fig. 3, the liquid cooling plate 8 includes a bottom plate portion 81 and a side plate portion 82, the bottom plate portion 81 is disposed at the bottom of the battery module 4, the side plate portion 82 is disposed at the side portion of the battery module 4, the bottom plate portion 81 and the side plate portion 82 are bent and connected, and the bottom plate portion 81 and the side plate portion 82 are provided with cooling channels, so that the cooling of the liquid cooling plate 8 to the battery module 4 is quicker and the heat transfer is more uniform.

In some embodiments, the cooling flow path includes a first flow path 831 and a second flow path 832, an extending direction of the first flow path 831 intersects an extending direction of the second flow path 832, the first flow path 831 is provided at the bottom plate portion 81, and a portion of the second flow path 832 is provided at the bottom plate portion 81 and another portion is provided at the side plate portion 82.

Specifically, as shown in fig. 3, the liquid cooling plate 8 is disposed at the bottom and the side of the battery module 4, the liquid cooling plate 8 is provided with a cooling flow channel, so that the battery module 4 can be cooled and equalized, the cooling flow channel is provided with a first flow channel 831 and a second flow channel 832, the first flow channel 831 and the second flow channel 832 can be used for cooling and equalizing the battery module 4, the first flow channel 831 is disposed at the bottom plate portion 81, a part of the second flow channel 832 is disposed at the bottom plate portion 81 and another part is disposed at the side plate portion 82, the two parts are connected, the extending direction of the first flow channel 831 is intersected with the extending direction of the second flow channel 832, in this embodiment, the extending direction of the first flow channel 831 is perpendicular to the extending direction of the second flow channel 832, so as to improve the cooling effect of the liquid cooling plate 8 on the battery module 4.

In some embodiments, dodging grooves 84 and first flow channels 831 are distributed at intervals in parallel, liquid cooling plate 8 is installed at the bottom of battery module 4, as shown in fig. 3, liquid cooling plate 8 is provided with dodging grooves 84, dodging grooves 84 and explosion-proof valve 5 are arranged opposite to each other, and dodging grooves 84 and first flow channels 831 are distributed at intervals in parallel, so that liquid cooling plate 8 can cool the bottom of battery module 4 normally and can exhaust high-pressure gas in battery pack 100, and use safety of battery pack 100 is improved.

In some embodiments, a first heat conductive structural adhesive 6 is provided between the bottom plate portion 81 and the battery module 4; and/or, the side part of the battery module 4 is provided with a pole 41, the pole 41 is connected with a busbar 42, and a second heat conduction structural adhesive 7 is arranged between the side plate part 82 and the busbar 42.

Specifically, as shown in fig. 1, a first heat-conducting structural adhesive 6 is disposed between the bottom plate portion 81 of the liquid cooling plate 8 and the battery module 4, the bottom plate portion 81 of the liquid cooling plate 8 and the battery module 4 can be adhered by the first heat-conducting structural adhesive 6, and the first heat-conducting structural adhesive 6 can also perform heat transfer and other operations, when the liquid flows in the first flow channel 831, the heat of the battery module 4 can be transferred to the first flow channel 831 through the first heat-conducting structural adhesive 6, and then exchanges heat with the liquid in the first flow channel 831.

Further, the side portion of the battery module 4 is provided with a pole 41, the pole 41 is connected with a busbar 42, a second heat conducting structural adhesive 7 is arranged between the side plate portion 82 and the busbar 42, the busbar 42 can be connected with the side plate portion 82 through the second heat conducting structural adhesive 7, the second heat conducting structural adhesive 7 can conduct heat transfer and other operations, when liquid circulates in the second flow channel 832, heat of the battery module 4 can be transferred to the second flow channel 832 through the second heat conducting structural adhesive 7, and then heat exchange is conducted with the liquid in the second flow channel 832, so that cooling and temperature equalization of the pole 41 are achieved.

In some embodiments, the liquid cooling plate 8 is provided with a vent hole 85 and a communication hole 86, the vent hole 85 is opposite to the explosion-proof valve 5, the vent hole 85 and the communication hole 86 are respectively communicated with the vent groove 84, and the vent groove 84 is communicated with the exhaust passage 92 through the communication hole 86.

Specifically, as shown in fig. 3, the liquid cooling plate 8 is provided with an avoidance hole 85, the avoidance hole 85 and the explosion-proof valve 5 are just opposite to each other, the shape of the explosion-proof valve 5 and the shape of the avoidance hole 85 are matched, so that the explosion-proof valve 5 can be arranged in the avoidance hole 85, the liquid cooling plate 8 is further provided with a communication hole 86, the avoidance hole 85 and the communication hole 86 are respectively communicated with the avoidance groove 84, the avoidance hole 85 is communicated with the avoidance groove 84, high-pressure gas inside the battery pack 100 can be discharged to the avoidance groove 84 through the explosion-proof valve 5, the communication hole 86 is also communicated with the avoidance groove 84, the avoidance groove 84 can be connected through the communication hole 86, the high-pressure gas in the avoidance groove 84 can be transmitted through the communication hole 86, the reliability of high-pressure gas conveying is guaranteed, and the use safety of the battery pack 100 is improved.

In some embodiments, the explosion-proof valves 5 of each battery module 4 are multiple, the avoidance holes 85 are multiple and correspond to the explosion-proof valves 5 one by one, and the avoidance holes 85 are distributed at intervals along the extending direction of the avoidance grooves 84.

Specifically, as shown in fig. 1-2, the liquid cooling plate 8 is provided with avoidance holes 85, the avoidance holes 85 and the explosion-proof valves 5 are just opposite to each other, the explosion-proof valves 5 can be provided in a plurality of ways, the avoidance holes 85 can also be provided in a plurality of ways, and the plurality of avoidance holes 85 and the plurality of explosion-proof valves 5 are arranged in a one-to-one correspondence manner, so that each explosion-proof valve 5 can effectively relieve pressure, the plurality of explosion-proof valves 5 are arranged to improve the pressure release efficiency, the use safety of the battery pack 100 is further ensured, the plurality of avoidance holes 85 are distributed at intervals along the extending direction of the avoidance groove 84, high-pressure gas exhausted through the explosion-proof valves 5 can be conveyed along the avoidance groove 84, the pressure release efficiency is improved, meanwhile, the connecting ribs are arranged between the plurality of avoidance holes 85, the problem that the strength of the liquid cooling plate 8 in the length direction is reduced due to the arrangement of the avoidance holes 85 can be avoided, and the integral structural strength of the battery pack 100 is improved.

In some embodiments, the bottom shield assembly 9 is also provided with a buffer chamber 91 spaced from the exhaust passage 92.

Specifically, as shown in fig. 1-2 and fig. 4, the bottom protection plate assembly 9 is further provided with a buffer cavity 91 spaced from the exhaust channel 92, the buffer cavities 91 are arranged in a plurality, and the buffer cavities 91 are arranged in parallel and spaced, the buffer cavities 91 can provide support for the bottom of the battery module 4 and can buffer, when the bottom of the battery pack 100 is impacted, the acting force firstly acts on the bottom protection plate assembly 9, the bottom protection plate assembly 9 is provided with the buffer cavities 91, the buffer cavities 91 can weaken the acting force, reduce the acting effect of the acting force, thereby protecting the liquid cooling plate 8, the explosion-proof valve 5 and the like, protecting the whole battery module 4, improving the use safety of the battery pack 100, wherein the buffer cavities 91 can be also arranged as solid cavities, the inside of the cavities can be filled with buffer materials, and further improving the buffering effect of the buffer cavities 91.

In some embodiments, the bottom shield assembly 9 is provided with a buffer 93 between the region of the buffer chamber 91 and the liquid cooling plate 8.

Specifically, as shown in fig. 1, the bottom guard plate assembly 9 is provided with a buffer member 93 between the region where the buffer cavity 91 is located and the liquid cooling plate 8, the buffer member 93 can adopt square microporous foam or cellular foam and the like, so that the buffer member 93 has good impact resistance, and can effectively absorb energy generated by impact, when the bottom guard plate assembly 9 receives external impact force, acting force acts on the bottom guard plate assembly 9, after being buffered by the buffer cavity 91 of the bottom guard plate assembly 9, the acting force is conducted to the buffer member 93, and the buffer member 93 is used for buffering and absorbing energy, so that the effect of acting force is weakened, and the explosion-proof valve 5 is further protected, so that the whole battery module 4 is protected.

In some embodiments, the battery modules 4 and the liquid cooling plates 8 are multiple and in one-to-one correspondence; the buffer chamber 91 includes a side buffer chamber 91 and a middle buffer chamber 91, the side buffer chamber 91 is located at the bottom of the battery module 4, and the middle buffer chamber 91 is located at the bottom of the junction of two adjacent battery modules 4.

Specifically, as shown in fig. 1, the battery modules 4 are set to be plural, the liquid cooling plates 8 are also set to be plural, and the plural battery modules 4 and the plural liquid cooling plates 8 are in one-to-one correspondence, so that the protection effect on the battery modules 4 and the cooling effect on the battery modules 4 can be improved.

Further, as shown in fig. 1-2, the buffer cavity 91 includes a side buffer cavity 91 and a middle buffer cavity 91, the side buffer cavity 91 is located at the bottom of the battery module 4, the middle buffer cavity 91 is located at the bottom of the junction of two adjacent battery modules 4, that is, the buffer cavity 91 can buffer and support two sides and the middle of the battery module 4, three-point support on the bottom of the battery module 4 is achieved, the overall rigidity of the battery pack 100 is ensured, and the buffer cavity 91 can be filled with buffer materials, so that the buffer effect of the buffer cavity 91 is further improved, the bottom guard plate assembly 9 is arranged at the bottom of the battery module 4 and can serve as a box longitudinal beam, and the overall integration level of the battery pack 100 is improved.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., 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 utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A battery pack, comprising:

the battery box body is internally provided with a battery module, and the bottom of the battery module is provided with an explosion-proof valve;

the bottom guard plate assembly comprises a liquid cooling plate and a bottom guard plate assembly, the liquid cooling plate is arranged at the bottom of the battery module, the bottom guard plate assembly is connected to the bottom of the battery box body and supported at the bottom of the liquid cooling plate, the liquid cooling plate is provided with a cooling flow passage and an avoidance groove, the avoidance groove is opposite to the explosion-proof valve, and the bottom guard plate assembly is provided with an exhaust passage communicated with the avoidance groove.

2. The battery pack according to claim 1, wherein the liquid cooling plate includes a bottom plate portion and a side plate portion, the bottom plate portion and the side plate portion are bent and connected and are each provided with the cooling flow passage, the bottom plate portion is located at the bottom of the battery module, and the side plate portion is located at the side of the battery module.

3. The battery pack according to claim 2, wherein the cooling flow passage includes a first flow passage and a second flow passage, an extending direction of the first flow passage intersects an extending direction of the second flow passage, the first flow passage is provided in the bottom plate portion, and a part of the second flow passage is provided in the bottom plate portion and another part is provided in the side plate portion.

4. The battery pack of claim 3, wherein the relief grooves are spaced apart parallel to the first flow path.

5. The battery pack according to claim 2, wherein a first heat conductive structural adhesive is provided between the bottom plate portion and the battery module;

and/or the side part of the battery module is provided with a pole, the pole is connected with a busbar, and a second heat conduction structural adhesive is arranged between the side plate part and the busbar.

6. The battery pack according to claim 2, wherein the liquid cooling plate is provided with an avoidance hole and a communication hole, the avoidance hole is arranged opposite to the explosion-proof valve, the avoidance hole and the communication hole are respectively communicated with the avoidance groove, and the avoidance groove is communicated with the exhaust passage through the communication hole.

7. The battery pack according to claim 6, wherein the explosion-proof valves of each battery module are multiple, the avoidance holes are multiple and correspond to the explosion-proof valves one by one, and the avoidance holes are distributed at intervals along the extending direction of the avoidance groove.

8. The battery pack of claim 1, wherein the bottom shield assembly is further provided with a buffer cavity spaced from the vent channel.

9. The battery pack of claim 8, wherein the bottom shield assembly is provided with a buffer between the liquid cooling plate and an area where the buffer chamber is located.

10. The battery pack according to claim 8 or 9, wherein the battery modules and the liquid cooling plates are plural and in one-to-one correspondence;

the buffer cavity comprises a side buffer cavity and a middle buffer cavity, wherein the side buffer cavity is positioned at the bottom of the battery module, and the middle buffer cavity is positioned at the bottom of the joint of two adjacent battery modules.