Integrated battery pack and electric vehicle

Abstract

The utility model relates to an integrated type battery pack and electric car, the integrated type battery pack includes box, battery module and liquid cooling plate, the box is equipped with the accommodation cavity, battery module is arranged in the accommodation cavity, the liquid cooling plate is arranged below battery module, the bottom of battery module forms the pressure relief valve, the liquid cooling plate is equipped with the liquid cooling plate, and the liquid cooling plate is equipped with the liquid cooling plate. The side face, provided with the pressure relief valve, of the battery module abuts against the liquid cooling plate, a pressure relief channel is formed in the liquid cooling plate, a pressure relief hole communicated with the pressure relief channel is formed in the side face, facing the battery module, of the liquid cooling plate, and the pressure relief hole faces the pressure relief valve. During pressure relief, high-temperature gas and other substances can be far away from the top of the box body, so that the heat influence of the high-temperature substances on the passenger compartment is reduced. The high-temperature gas discharged during pressure relief can also be quickly cooled in the moving process in the pressure relief channel, so that the temperature in the whole box body is reduced, the heat influence on the passenger compartment from the box body is effectively reduced, and the heat safety performance of the passenger compartment is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, in particular to an integrated battery pack and an electric vehicle. Background Art

[0002] With the rapid development and technological iteration of new energy vehicles, the industry has put forward higher requirements for vehicle lightweight, safety and manufacturing cost. For this reason, the CTB (cell to body) technology has emerged, and through the integrated vehicle design, it can meet the market demand of reducing the types of components and lowering the manufacturing cost of the whole vehicle.

[0003] In an existing CTB electric vehicle, the chassis of the whole vehicle is integrated with the box body of the battery pack, which greatly simplifies the vehicle structure. Since the top of the box body of the battery pack forms the bottom of the passenger compartment of the whole vehicle, when the battery module in the battery pack has a thermal runaway, the high-temperature substances discharged by the pressure relief valve spread to the bottom of the passenger compartment, directly causing a thermal impact on the passenger compartment, making the thermal safety of the passenger compartment unable to be effectively guaranteed. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an integrated battery pack and an electric vehicle, which can reduce the thermal impact on the passenger compartment when the battery pack relieves pressure and has good thermal safety performance.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An integrated battery pack is provided, including a box body, a battery module and a liquid cooling plate. The box body has a receiving cavity, the battery module is arranged in the receiving cavity, the liquid cooling plate is arranged below the battery module, a pressure relief valve is formed at the bottom of the battery module, one side of the battery module having the pressure relief valve abuts against the liquid cooling plate, a pressure relief channel is formed in the liquid cooling plate, and a pressure relief hole communicating with the pressure relief channel is opened on one side of the liquid cooling plate facing the battery module, and the pressure relief hole faces the pressure relief valve.

[0007] Further, the liquid cooling plate is arranged at the bottom of the box body.

[0008] Further, a mica sheet covers the pressure relief hole, and the mica sheet is used to selectively block the pressure relief hole.

[0009] Further, a plurality of liquid cooling channels arranged at intervals in a first direction are formed in the liquid cooling plate, and the pressure relief channel is located between two adjacent liquid cooling channels.

[0010] Further, the liquid cooling plate includes a first plate and a second plate arranged in a stacked manner. A plurality of grooves spaced apart in the first direction are formed on one side surface of the second plate facing the battery module. The first plate is disposed on the side of the second plate facing the battery module, and the first plate can block the openings of the grooves. A part of the grooves and the first plate enclose the pressure relief channel, and another part of the grooves and the first plate enclose the liquid cooling channel. The pressure relief hole is opened on the first plate.

[0011] Further, a plurality of pressing strips are spaced apart at the top of the battery module, and opposite ends of the pressing strips are respectively connected to the battery module and the inner wall of the box body.

[0012] Further, the battery module includes a plurality of battery packs arranged in sequence in the first direction. Each battery pack includes a plurality of single battery cells arranged in sequence in the second direction. The first direction is perpendicular to the second direction, and adjacent single battery cells are bonded and fixed by structural adhesive.

[0013] Further, the side wall of the box body is a hollow structure, and a first buffer layer is filled in the side wall of the box body.

[0014] Further, a second buffer layer is filled between the battery module and the inner wall of the box body.

[0015] Further, it further includes a bottom guard plate, and the bottom guard plate is clamped between the bottom of the accommodation cavity and the liquid cooling plate.

[0016] An electric vehicle is further provided, which includes a vehicle body, a seat, and an integrated battery pack. The integrated battery pack is disposed on the vehicle body, and the seat is installed on the top of the box body of the integrated battery pack.

[0017] The beneficial effects of the present utility model: By arranging the pressure relief valve at the bottom of the battery module, when relieving pressure, high-temperature gases and other substances can be far away from the top of the box body, so as to reduce the thermal influence of high-temperature substances on the passenger compartment. And, since the pressure relief channel for transporting high-temperature substances is arranged on the liquid cooling plate, the high-temperature gas discharged during pressure relief can also be quickly cooled during the movement in the pressure relief channel, thereby reducing the temperature inside the entire box body, effectively reducing the thermal influence of the box body on the passenger compartment, and improving the thermal safety performance of the passenger compartment. Description of the Drawings

[0018] Figure 1 It is an exploded view of the integrated battery pack according to an embodiment of the present utility model.

[0019] Figure 2 It is a top view of the integrated battery pack according to an embodiment of the present utility model.

[0020] Figure 3Schematic diagram of the battery module and the liquid cooling plate according to an embodiment of the present utility model.

[0021] Figure 4 Partial cross-sectional view of the battery module according to an embodiment of the present utility model.

[0022] Figure 5 Partial cross-sectional view of the integrated battery pack according to an embodiment of the present utility model.

[0023] Figure 6 is Figure 5 Enlarged view of location A in

[0024] In the figure:

[0025] 1. Box body; 11. Box bottom; 110. Accommodating cavity; 111. Bottom plate; 112. Side plate; 113. Side beam; 12. Box cover; 13. Mounting bracket; 2. Battery module; 21. Single battery; 22. Pressure relief valve; 23. Terminal post; 24. CCS component; 25. Insulating sheet; 3. Liquid cooling plate; 30. Pressure relief hole; 31. First plate; 32. Second plate; 33. Pressure relief channel; 34. Liquid cooling channel; 4. Stripping bar; 41. Support plate; 5. Bottom protection plate; 6. BDU electrical component; 61. Copper busbar; 7. First buffer layer; 8. Second buffer layer; 9. Mounting groove. Detailed implementation manners

[0026] To make the technical problems solved by the present utility model, the technical solutions adopted and the achieved technical effects clearer, the technical solutions of the present utility model will be further described below with reference to the drawings and through specific implementation manners.

[0027] As Figure 1 , Figure 5 and Figure 6As shown, the utility model provides an integrated battery pack, including a box body 1, a battery module 2 and a liquid cooling plate 3. Among them, the box body 1 is a rectangular parallelepiped structure, the length direction of the box body 1 is the X direction shown in the figure, the width direction of the box body 1 is the Y direction shown in the figure, and the height direction of the box body 1 is the Z direction shown in the figure. The box body 1 is a hollow structure, and there is a accommodating cavity 110 in the box body 1. The battery module 2 and the liquid cooling plate 3 are both installed in the accommodating cavity 110, and the liquid cooling plate 3 is arranged below the battery module 2. Specifically, the liquid cooling plate 3 is arranged at the bottom of the box body 1, that is, the liquid cooling plate 3 is located at the bottom of the accommodating cavity 110. The battery module 2 includes a plurality of single cells 21, and one end of the single cell 21 has two poles 23, and the two poles 23 are respectively a positive pole and a negative pole. A pressure relief valve 22 is arranged at one end of the single cell 21 away from the pole 23. When the battery module 2 has thermal runaway, the pressure relief valve 22 opens to release the high-temperature gas and other substances (such as electrolyte) inside the single cell 21. The orientation description in this embodiment is based on the integrated battery pack installed on the electric vehicle, that is, the pressure relief valve 22 is located at the bottom of the battery module 2, and the pole 23 is located at the top of the battery module 2. The battery module 2 is installed on the liquid cooling plate 3, and one side of the battery module 2 having the pressure relief valve 22 (that is, the bottom surface of the battery module 2) is in contact with the liquid cooling plate 3, so that the liquid cooling plate 3 can exchange heat with the battery module 2 to achieve the cooling treatment of the battery module 2. A pressure relief channel 33 is formed in the liquid cooling plate 3, and a pressure relief hole 30 is opened on one side of the liquid cooling plate 3 facing the battery module 2, and the pressure relief hole 30 is connected to the pressure relief channel 33. The number and position of the pressure relief holes 30 are set in a one-to-one correspondence with the number and position of the pressure relief valves 22 in the battery module 2. The pressure relief hole 30 faces the corresponding pressure relief valve 22. When the battery module 2 has thermal runaway, the high-temperature gas and other substances are discharged into the pressure relief channel 33 through the pressure relief valve 22 and the pressure relief hole 30 in turn, and finally transported to the outside of the box 1 along the pressure relief channel 33.

[0028] It is understandable that the integrated battery pack is installed on the body of the electric vehicle, and the top of the box 1 forms the bottom of the passenger compartment to achieve an integrated design of the vehicle chassis and the integrated battery pack. Since the pressure relief valve 22 is located at the bottom of the battery module 2, the high-temperature gas and other substances can be kept away from the top of the box 1 during pressure relief to reduce the thermal impact of the high-temperature substances on the passenger compartment. In addition, since the pressure relief channel 33 for conveying high-temperature substances is arranged on the liquid cooling plate 3, the high-temperature gas discharged during pressure relief can also be quickly cooled during the movement in the pressure relief channel 33, thereby reducing the temperature inside the entire box 1 and effectively reducing the thermal impact of the box 1 on the passenger compartment.

[0029] Specifically, the box body 1 includes a box bottom 11 and a box cover 12. The box bottom 11 includes a bottom plate 111, four side plates 112 and side beams 113. The bottom plate 111 is a square flat plate, and the four side plates 112 surround the periphery of the bottom plate 111, and an accommodation cavity 110 is formed between the bottom plate 111 and the four side plates 112. Two of the opposite side plates 112 are arranged in an "L" shape, that is, the side plate 112 includes a vertical plate and a horizontal plate that are vertically arranged, and the free end of the horizontal plate extends in a direction away from the accommodation cavity 110. There are multiple side beams 113, and the multiple side beams 113 are arranged at intervals on the "L" - shaped side plate 112, that is, the side beam 113 is connected and fixed to both the vertical plate and the horizontal plate at the same time. The side beam 113 is made by a rolling process, and it is used to strengthen the structural strength of the box body 1 to prevent the box body 1 from deforming when being impacted from the side. The box cover 12 is covered on the top of the box bottom 11 so that an accommodation cavity 110 is formed between the box cover 12 and the box bottom 11. An installation bracket 13 is arranged on one side of the box cover 12 facing away from the box bottom 11, and the installation bracket 13 is used to install a seat. The box cover 12 and the box bottom 11 are installed and fixed by means such as bolt fixation, screw fixation, rivet fixation and welding fixation.

[0030] Specifically, the integrated battery pack further includes a bottom protection plate 5, and the bottom protection plate 5 is clamped between the bottom of the accommodation cavity 110 and the liquid - cooling plate 3. The bottom protection plate 5 plays a role in protecting the liquid - cooling plate 3, preventing the bottom plate 111 of the box body 1 from being damaged due to impact when the electric vehicle hits the bottom.

[0031] Specifically, the integrated battery pack further includes a BDU electrical component 6 (Battery Disconnect Unit, battery pack circuit breaker unit, hereinafter referred to as "BDU"). The BDU electrical component 6 is a prior art, and it is used for high - voltage power distribution. The BDU electrical component 6 is electrically connected to the battery module 2.

[0032] Refer to Figure 1 and Figure 3 As shown, four battery modules 2 are provided, and the four battery modules 2 are distributed in a rectangular array. Of course, in some embodiments, the arrangement number and distribution form of the battery modules 2 can be flexibly selected according to the specific internal structure and power storage capacity of the integrated battery pack. The battery module 2 includes a plurality of battery groups arranged in sequence along a first direction (the Y direction shown in the figure), and each battery group includes a plurality of single - cell batteries 21 arranged in sequence along a second direction (the X direction shown in the figure). In this embodiment, each battery module 2 includes three battery groups. The single - cell battery 21 is a square battery, and the top of the single - cell battery 21 has a positive electrode post and a negative electrode post. In the same battery group, all the positive electrode posts are arranged in a row along the length direction of the box body 1, and all the negative electrode posts are arranged in a row along the length direction of the box body 1.

[0033] The battery module 2 further includes a CCS component 24 and an insulating sheet 25. Among them, the CCS component 24 (Cells Contact System, the battery module acquisition and integration component, hereinafter referred to as "CCS") is connected to the pole post 23 of the single battery 21 and is used for voltage and temperature data acquisition, etc. The CCS component 24 is located at the top of the battery module 2, and the insulating sheet 25 is used to cover the CCS component 24 to play an insulating and protective role. The BDU electrical component 6 includes a busbar 61, and the length of the busbar 61 extends along the length direction of the box body 1. The four battery modules 2 are divided into two groups respectively and are distributed on both sides of the busbar 61 so that the corresponding CCS components 24 on the four battery modules 2 can be connected to the busbar 61.

[0034] Referring to Figure 3 , Figure 5 and Figure 6 As shown, a mica sheet (not shown in the figure) covers the pressure relief hole 30 of the liquid cooling plate 3, and the mica sheet is used to selectively block the pressure relief hole 30. The mica sheet has a heat insulation effect and an isolation effect, avoiding that when a certain single battery 21 relieves pressure, the high-temperature substances discharged into the pressure relief channel 33 cause thermal influence and pollution to the other single batteries 21 around through the surrounding pressure relief holes 30. When the single battery 21 relieves pressure, the high-temperature and high-pressure gas can break through the mica sheet and enter the pressure relief channel 33 through the pressure relief hole 30.

[0035] A plurality of liquid cooling channels 34 are formed in the liquid cooling plate 3 and are arranged at intervals in the first direction (the Y direction shown in the figure). The pressure relief channel 33 is located between two adjacent liquid cooling channels 34. The liquid cooling plate 3 includes a first plate 31 and a second plate 32 which are stacked. A plurality of grooves are formed on one side surface of the second plate 32 facing the battery module 2. The plurality of grooves are distributed at intervals in the first direction, and the length of each groove extends along the length direction of the box body 1. The first plate 31 is arranged on the side of the second plate 32 facing the battery module 2, and the first plate 31 covers the notch of the groove. The first plate 31 can block the notch of the groove so that the groove is in a closed state. A part of the grooves and the first plate 31 enclose the pressure relief channel 33, and the pressure relief channel 33 is located directly below the pressure relief valve 22 of the battery module 2. Another part of the grooves and the first plate 31 enclose the liquid cooling channel 34. A pressure relief hole 30 is formed on the first plate 31, and the pressure relief hole 30 is located above the pressure relief channel 33. Correspondingly, a pressure relief port is also arranged on the side wall of the box body 1, and the pressure relief channel 33 on the liquid cooling plate 3 is communicated with the pressure relief port so as to discharge the high-temperature gas and gas substances to the outside of the box body 1 through the pressure relief port during pressure relief. In addition, an inlet and an outlet communicated with the liquid cooling channel 34 are also arranged on the liquid cooling plate 3, and the inlet and the outlet are respectively communicated with an external coolant storage tank to realize the circulating flow of the liquid coolant between the liquid cooling plate 3 and the coolant storage tank. In this embodiment, by arranging the pressure relief channel 33 between adjacent liquid cooling channels 34, it is beneficial to quickly absorb the heat of the high-temperature substances in the pressure relief channel 33 by the liquid cooling channel 34, and play a role in quickly cooling the integrated battery pack. For the convenience of processing and manufacturing the second plate 32, the second plate 32 is arranged to be bent back and forth along the first direction, that is, the cross section of the second plate 32 is in an "S" shape, so that a plurality of grooves distributed at intervals are formed on one side of the second plate 32.

[0036] Referring Figure 3 and Figure 4 As shown, a plurality of pressure bars 4 are arranged at intervals on the top of the battery module 2. The opposite ends of the pressure bar 4 are respectively connected to the battery module 2 and the inner wall of the box body 1. The pressure bar 4 has a long strip columnar structure, and the length of the pressure bar 4 extends along the length direction of the box body 1. The plurality of pressure bars 4 are parallel and arranged at intervals along the width direction of the box body 1. The pressure bar 4 plays a role in supporting the box cover 12. When the box cover 12 is subjected to the pressure from the seat and the occupant, this pressure can be evenly distributed to the shells of a plurality of single batteries 21 through the pressure bar 4, avoiding the deformation of the top of the box body 1 due to concentrated force, and avoiding the pressure from the box cover 12 directly pressing on the pole column 23 of the single battery 21 and causing a circuit failure. The opposite ends of the pressure bar 4 are respectively bonded and fixed to the battery module 2 and the inner wall of the box body 1. That is, the top end of the pressure bar 4 is bonded and fixed to the inner wall of the box cover 12 through structural glue.

[0037] Inside the box body 1, multiple battery modules 2 are installed. In this embodiment, the number of battery modules 2 is four. The four battery modules 2 are divided into two groups, and the two groups of battery modules 2 are arranged at intervals in the first direction, so that the busbar 61 of the BDU electrical component 6 can be installed between the two groups of battery modules 2. This structure not only facilitates the connection between the busbar 61 and the battery module 2, but also saves space. Along the first direction, a support plate 41 is arranged between two adjacent battery modules 2. Both ends of the support plate 41 are connected to the pressure strips 4 on the battery module 2, and an installation groove 9 is formed between the support plate 41 and the two pressure strips 4. The busbar 61 is installed in the installation groove 9.

[0038] Referring to Figure 5 As shown, the side wall of the box body 1 is a hollow structure. Specifically, since the corresponding area of the accommodation cavity 110 mainly exists on the box bottom 11, the side wall of the box bottom 11 is set as a hollow structure. The side wall of the box bottom 11 is filled with a first buffer layer 7. The first buffer layer 7 is foaming glue, which plays a role in buffering and energy absorption. When the side wall of the box body 1 is subjected to an external force impact, the first buffer layer 7 can be used for buffering protection to avoid damaging the battery module 2 inside the box body 1.

[0039] Specifically, a second buffer layer 8 is filled between the battery module 2 and the inner wall of the box body 1. Since the corresponding area of the accommodation cavity 110 mainly exists on the box bottom 11, the second buffer layer 8 is arranged between the inner wall of the box bottom 11 and the battery module 2. The second buffer layer 8 is foaming glue, which plays a role in buffering and energy absorption. When the side wall of the box body 1 is subjected to an external force impact, the first buffer layer 7 can be used for buffering protection to avoid damaging the battery module 2 inside the box body 1.

[0040] Specifically, in the battery module 2, adjacent single cells 21 are bonded and fixed by structural adhesive. By filling the structural adhesive, the gap between adjacent single cells 21 can be eliminated, so that all the single cells 21 form a whole, which can improve the structural strength of the entire battery module 2, and at the same time, the entire battery module 2 is used to bear the pressure from the box cover 12.

[0041] As Figure 1 and Figure 2 shown, an electric vehicle is also provided, including a vehicle body, a seat and an integrated battery pack. The integrated battery pack is installed on the vehicle body, and the top of the box body 1 (i.e., the box cover 12) of the integrated battery pack is used as the bottom of the passenger compartment of the vehicle body at the same time, thereby simplifying the overall vehicle structure. The seat is installed on the mounting bracket 13 on the box cover 12. Since the pressure relief valve 22 of the battery module 2 is located at the bottom of the box body 1, the high-temperature gas discharged during pressure relief is discharged from the bottom area of the box body 1, reducing the thermal influence of the high-temperature gas on the top area of the box body 1, and further reducing the thermal influence of the box body 1 on the passenger compartment, thereby improving the thermal safety performance of the passenger compartment.

[0042] Remarkable effects of this embodiment: By arranging the pressure relief valve 22 at the bottom of the battery module 2, when pressure is relieved, high-temperature gases and other substances can be kept away from the top of the box body 1, so as to reduce the thermal influence of high-temperature substances on the passenger compartment. Moreover, since the pressure relief channel 33 for transporting high-temperature substances is arranged on the liquid cooling plate 3, the high-temperature gases discharged during pressure relief can also be quickly cooled during the movement in the pressure relief channel 33, thereby reducing the temperature inside the entire box body 1, effectively reducing the thermal influence of the box body 1 on the passenger compartment, and improving the thermal safety performance of the passenger compartment.

[0043] The above content is only the preferred embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. The content of this specification should not be construed as a limitation to the present invention.

Claims

1. An integrated battery pack, characterized in that: The invention comprises a box body, a battery module and a liquid cooling plate, wherein the box body has a accommodating cavity, the battery module is arranged in the accommodating cavity, the liquid cooling plate is arranged below the battery module, a pressure relief valve is formed at the bottom of the battery module, a side surface of the pressure relief valve of the battery module abuts against the liquid cooling plate, a pressure relief channel is formed in the liquid cooling plate, a pressure relief hole connected with the pressure relief channel is formed on a side surface of the liquid cooling plate facing the battery module, and the pressure relief hole is directed toward the pressure relief valve.

2. The integrated battery pack according to claim 1, characterized in that: The liquid cooling plate is arranged at the bottom of the box body.

3. The integrated battery pack according to claim 1, characterized in that: The pressure relief hole is covered with a mica sheet, and the mica sheet is used to selectively block the pressure relief hole.

4. The integrated battery pack according to claim 1, characterized in that: A plurality of liquid cooling channels spaced apart along a first direction are formed in the liquid cooling plate, and the pressure relief channel is located between two adjacent liquid cooling channels.

5. The integrated battery pack according to claim 4, characterized in that: The liquid cooling plate includes a first plate and a second plate which are stacked, a side of the second plate facing the battery module being formed with a plurality of grooves spaced apart along the first direction, the first plate being arranged on a side of the second plate facing the battery module, and the first plate being capable of blocking the notches of the grooves, wherein a portion of the grooves and the first plate form the pressure relief channel, and another portion of the grooves and the first plate form the liquid cooling channel, and the pressure relief hole is opened on the first plate.

6. The integrated battery pack according to any one of claims 1 to 5, characterized in that: A plurality of pressure strips are arranged at intervals on the top of the battery module, and opposite ends of the pressure strips are respectively connected to the battery module and the inner wall of the box body.

7. The integrated battery pack according to any one of claims 1 to 5, characterized in that: The battery module includes a plurality of battery packs arranged in sequence along a first direction, each of the battery packs includes a plurality of single cells arranged in sequence along a second direction, the first direction is perpendicular to the second direction, and adjacent single cells are bonded and fixed by structural adhesive.

8. The integrated battery pack according to any one of claims 1 to 5, characterized in that: The side wall of the box body is a hollow structure, and the side wall of the box body is filled with a first buffer layer.

9. The integrated battery pack according to any one of claims 1 to 5, characterized in that: A second buffer layer is filled between the battery module and the inner wall of the box.

10. The integrated battery pack according to any one of claims 1 to 5, characterized in that: It also includes a bottom guard plate, which is clamped between the bottom of the accommodating cavity and the liquid cooling plate.

11. An electric vehicle, characterized in that: It comprises a vehicle body, a seat and an integrated battery pack as claimed in any one of claims 1 to 10, wherein the integrated battery pack is arranged on the vehicle body and the seat is installed on the top of the box of the integrated battery pack.

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