Battery module, battery pack and new energy automobile

Abstract

The embodiment of the utility model provides a battery module, a battery pack and a new energy automobile, and relates to the technical field of power batteries. The battery module comprises a bottom plate, a cover plate, a plurality of battery cells and a plurality of heat conduction pieces, the plurality of battery cells are arranged on the bottom plate, and the plurality of battery cells are bonded with the bottom plate; the cover plate is arranged on one side, far away from the bottom plate, of the plurality of battery cells, and the cover plate is bonded with the plurality of battery cells; the plurality of heat conduction pieces are arranged between the bottom plate and the cover plate, and the two sides of each battery cell are in contact with the heat conduction pieces. According to the battery module, the heat dissipation area of the battery cells can be increased, the risk of chain thermal runaway of the surrounding battery cells is reduced, and the safety of the module is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular to a battery module, a battery pack and a new energy vehicle. Background Art

[0002] In the prior art, for the assembly of cylindrical battery modules, a liquid cooling flat tube is often used between the battery cells, and the battery cells are fixed by a plastic tray. When one of the battery cells has thermal runaway, the liquid cooling flat tube can quickly reduce the temperature of the battery cell, thereby preventing the entire module battery from having thermal runaway.

[0003] However, since the bottom of the cylindrical battery cell needs to be inserted into the round hole of the plastic tray in order to be fixed, the part of the battery cell inserted into the round hole of the tray cannot contact the liquid cooling flat tube. If thermal runaway occurs in the battery cell, the high temperature of the battery cell in the round hole cannot be quickly reduced, causing the round hole to melt through by the high temperature and transfer heat to the surrounding battery cells, easily causing the risk of chain thermal runaway in the surrounding battery cells. Utility Model Content

[0004] The purpose of the utility model is to provide a battery module, a battery pack and a new energy vehicle, which can increase the heat dissipation area of ​​the battery cell, reduce the risk of chain thermal runaway of surrounding battery cells, and improve the safety of the module.

[0005] The embodiment of the utility model is achieved as follows:

[0006] In a first aspect, the utility model provides a battery module, comprising:

[0007] Base plate;

[0008] A plurality of battery cells, wherein the plurality of battery cells are disposed on the bottom plate and bonded to the bottom plate;

[0009] a cover plate, the cover plate being disposed on a side of the plurality of battery cells away from the bottom plate, and the cover plate being bonded to the plurality of battery cells; and

[0010] A plurality of heat-conducting members are arranged between the bottom plate and the cover plate, and both sides of each of the battery cells are in contact with the heat-conducting members.

[0011] In an optional embodiment, the bottom plate is provided with a plurality of avoidance through holes, the plurality of avoidance through holes are arranged in one-to-one correspondence with the plurality of battery cells, and the explosion-proof valves of the battery cells are located in the avoidance through holes.

[0012] In an optional embodiment, the cover plate is provided with a plurality of positive electrode through holes and a plurality of negative electrode through holes, the plurality of positive electrode through holes are arranged in one-to-one correspondence with the plurality of negative electrode through holes, and the positive electrode of the battery cell is arranged corresponding to the positive electrode through hole, and the negative electrode of the battery cell is arranged corresponding to the negative electrode through hole.

[0013] In an optional embodiment, the battery module further includes a first end plate and a second end plate, the first end plate and the second end plate are respectively arranged on both sides of the multiple battery cells, and both ends of the multiple heat conductive parts are respectively connected to the first end plate and the second end plate.

[0014] In an optional embodiment, the first end plate is disposed between the cover plate and the bottom plate, and two ends of the first end plate are respectively bonded to the cover plate and the bottom plate;

[0015] The second end plate is disposed between the cover plate and the bottom plate, and two ends of the second end plate are respectively bonded to the cover plate and the bottom plate.

[0016] In an optional embodiment, the base plate is a mica board.

[0017] In an optional embodiment, the cover plate is a mica plate.

[0018] In an optional embodiment, the battery module further includes a potting compound, and the potting compound is filled between the plurality of battery cells and between the battery cells and the heat conducting member.

[0019] In a second aspect, the utility model provides a battery pack, comprising the battery module described in any one of the aforementioned embodiments.

[0020] In a third aspect, the utility model provides a new energy vehicle, comprising the battery pack described in the aforementioned embodiment.

[0021] The beneficial effects of the embodiments of the utility model include:

[0022] The battery module includes a base plate, a cover plate, a plurality of battery cells and a plurality of heat-conducting parts. The plurality of battery cells are arranged on the base plate, and the plurality of battery cells are bonded to the base plate; the cover plate is arranged on the side of the plurality of battery cells away from the base plate, and the cover plate is bonded to the plurality of battery cells; the plurality of heat-conducting parts are arranged between the base plate and the cover plate, and both sides of each battery cell are in contact with the heat-conducting parts. Since the cover plate and the base plate are both sheet-like plates, and are respectively bonded and fixed to the top and bottom of the battery cell, more of the side of the battery cell can be exposed. In this way, the heat-conducting parts can cover more of the side of the battery cell, that is, increase the contact area with the surface of the battery cell, thereby increasing the heat dissipation area of ​​the battery cell, thereby reducing the risk of chain thermal runaway of the surrounding battery cells and improving the safety of the module.

[0023] The battery pack includes a battery module and has all the beneficial effects of the battery module.

[0024] The new energy vehicle includes a battery pack, which has all the beneficial effects of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic diagram of the structure of a new energy vehicle provided by an embodiment of the utility model;

[0027] Figure 2 A schematic diagram of the structure of a battery module provided by an embodiment of the utility model;

[0028] Figure 3 An exploded view of a battery module provided by an embodiment of the utility model;

[0029] Figure 4 A schematic structural diagram of a cover plate provided in an embodiment of the utility model.

[0030] Icon: 1000-new energy vehicle; 1100-battery pack; 100-battery module; 10-bottom plate; 11-avoidance through hole; 20-battery cell; 30-cover plate; 31-positive electrode through hole; 32-negative electrode through hole; 40-heat conductive part; 50-first end plate; 60-second end plate; 70-potting glue; 1200-vehicle body. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0034] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0035] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0036] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] As described in the background technology, in the prior art, for the assembly of cylindrical battery modules, a liquid cooling flat tube is often used between the battery cells, and the battery cells are fixed by a plastic tray. When one of the battery cells has thermal runaway, the liquid cooling flat tube can quickly reduce the temperature of the battery cell, thereby preventing the entire module battery from having thermal runaway.

[0038] However, the inventors have discovered that since the bottom of the cylindrical battery cell needs to be inserted into the round hole of the plastic tray in order to be fixed, the maximum height of the liquid-cooled flat tube is limited by the height between the upper and lower plastic trays of the battery cell. The battery cell fixing holes on the plastic tray also serve to isolate the battery cells. However, the battery cell part inserted into the round hole of the tray cannot contact the liquid-cooled flat tube. If thermal runaway occurs in the battery cell, the high temperature of the battery cell part in the round hole cannot be quickly reduced, causing the round hole to be melted through by the high temperature and transfer heat to the surrounding battery cells, easily causing the risk of chain thermal runaway in the surrounding battery cells.

[0039] Based on this, please refer to Figure 1-Figure 4 The embodiment of the utility model provides a battery module 100, a battery pack 1100 and a new energy vehicle 1000, which can effectively improve the above-mentioned technical problems, that is, it can increase the heat dissipation area of ​​the battery cell 20, reduce the risk of chain thermal runaway of the surrounding battery cells 20, and improve the safety of the module. The battery module 100, the battery pack 1100 and the new energy vehicle 1000 will be described in detail below.

[0040] Please refer to Figure 1 , Figure 1 The schematic diagram of the structure of the new energy vehicle 1000 provided in this embodiment is combined with Figure 1 The new energy vehicle 1000 includes a battery pack 1100 and a vehicle body 1200 . The battery pack 1100 is installed on the vehicle body 1200 , thereby providing electric energy for the vehicle body 1200 to realize various functions of the vehicle body 1200 .

[0041] Specifically, the battery pack 1100 includes a battery housing and a battery module 100. The battery module 100 is disposed in the battery housing. The battery module 100 serves as an energy source to provide electrical energy to the vehicle body 1200, thereby realizing the normal operation of the new energy vehicle 1000. For those skilled in the art, the battery pack 1100 may also include other components such as a battery management system, which will not be described in detail in this embodiment.

[0042] For further information, please refer to Figure 2 and Figure 3 , Figure 2 A schematic diagram of the structure of the battery module 100 provided in this embodiment, Figure 3 The exploded view of the battery module 100 provided in this embodiment is combined with Figure 2 and Figure 3The battery module 100 includes a base plate 10, a cover plate 30, a plurality of battery cells 20 and a plurality of heat-conducting members 40. The plurality of battery cells 20 are arranged on the base plate 10, and the plurality of battery cells 20 are bonded to the base plate 10; the cover plate 30 is arranged on a side of the plurality of battery cells 20 away from the base plate 10, and the cover plate 30 is bonded to the plurality of battery cells 20; the plurality of heat-conducting members 40 are all arranged between the base plate 10 and the cover plate 30, and both sides of each battery cell 20 are in contact with the heat-conducting member 40.

[0043] Since the cover plate 30 and the bottom plate 10 are both sheet-like plates and are respectively bonded and fixed to the top and bottom of the battery cell 20, more of the side of the battery cell 20 can be exposed. In this way, the thermal conductor 40 can cover more of the side of the battery cell 20, that is, increase the contact area with the surface of the battery cell 20, thereby increasing the heat dissipation area of ​​the battery cell 20, thereby reducing the risk of chain thermal runaway of the surrounding battery cells 20 and improving the safety of the module.

[0044] It should be noted that, in the present embodiment, the battery cell 20 is specifically a cylindrical battery cell, and correspondingly, the heat conductive member 40 is specifically a heat conductive flat tube, which is wavy in shape and can better fit the curved side of the cylindrical battery cell, thereby improving the heat dissipation area and heat dissipation efficiency; of course, in other embodiments, if the battery cell 20 is a square battery cell, the heat conductive member 40 can be a heat conductive plate.

[0045] like Figure 3 As shown, it should also be noted that, in the present embodiment, the plurality of battery cells 20 are arranged in a plurality of rows, and heat conducting members 40 are provided on both sides of the battery cells 20 in each row. It can also be understood that a heat conducting member 40 is provided between two adjacent rows of battery cells 20, and a heat conducting member 40 is also provided respectively for the plurality of rows of battery cells 20 at both ends, thereby achieving heat conduction and heat dissipation on both sides of all battery cells 20.

[0046] Please combine Figure 3 In order to avoid the explosion-proof valve of the battery cell 20, in the present embodiment, the bottom plate 10 is provided with a plurality of avoidance through holes 11, the plurality of avoidance through holes 11 are arranged one by one corresponding to the plurality of battery cells 20, and the explosion-proof valve of the battery cell 20 is located in the avoidance through holes 11.

[0047] It should be noted that in order to connect the multiple battery cells 20 in series or in parallel, the battery module 100 further includes a plurality of bus bars (not shown). Therefore, in order to facilitate the connection between the bus bars and the battery cells 20, please refer to Figure 4 , Figure 4 The structural diagram of the cover plate 30 provided in this embodiment, combined with Figure 3 and Figure 4The cover plate 30 is provided with a plurality of positive through holes 31 and a plurality of negative through holes 32. The plurality of positive through holes 31 are arranged in one-to-one correspondence with the plurality of negative through holes 32. The positive electrode of the battery cell 20 is arranged in correspondence with the positive through hole 31, and the negative electrode of the battery cell 20 is arranged in correspondence with the negative through hole 32.

[0048] Please continue to combine Figure 3 In order to better fix the heat conductive member 40, in the present embodiment, the battery module 100 further includes a first end plate 50 and a second end plate 60. The first end plate 50 and the second end plate 60 are respectively arranged on both sides of the plurality of battery cells 20, and the two ends of the plurality of heat conductive members 40 are respectively connected to the first end plate 50 and the second end plate 60.

[0049] It should be noted that the first end plate 50 and the second end plate 60 are respectively provided with a coolant inlet and a coolant outlet, so as to realize the circulation of the coolant in the liquid cooling element.

[0050] Further, in order to better install the first end plate 50 and the second end plate 60, please combine Figure 2 and Figure 3 The first end plate 50 is disposed between the cover plate 30 and the bottom plate 10, and the two ends of the first end plate 50 are respectively bonded to the cover plate 30 and the bottom plate 10; the second end plate 60 is disposed between the cover plate 30 and the bottom plate 10, and the two ends of the second end plate 60 are respectively bonded to the cover plate 30 and the bottom plate 10.

[0051] By arranging the first end plate 50 and the second end plate 60 between the cover plate 30 and the bottom plate 10 and bonding and fixing them accordingly, the compactness and structural stability of the overall battery module 100 can be improved; at the same time, space can be saved to a certain extent, thereby reducing the manufacturing cost of the battery pack 1100.

[0052] It should be noted that, in this embodiment, the bottom plate 10 and the cover plate 30 are both mica plates, which have excellent high temperature insulation performance, electrical insulation performance, environmental protection performance, bending strength and processing performance. Of course, in other embodiments, the bottom plate 10 and the cover plate 30 can also be other high temperature resistant plates such as fiberglass boards.

[0053] Please continue to combine Figure 2 and Figure 3In this embodiment, the battery module 100 further includes a potting glue 70, and the potting glue 70 is filled between the multiple battery cells 20 and between the battery cells 20 and the heat conductive member 40. That is to say, during the assembly process of the battery module 100, the bottom of the battery cell 20 is first bonded to the bottom plate 10, and then the heat conductive member 40 is attached to both sides of the battery cell 20, and then the first end plate 50 and the second end plate 60 are respectively connected to the two ends of the heat conductive member 40. At this time, there are gaps between the battery cells 20 and the battery cells 20, and between the battery cells 20 and the heat conductive member 40, and these gaps are filled with the potting glue 70 to form an integrated potting structure.

[0054] It should be noted that the potting glue 70 has the functions of insulation, waterproof and moisture-proof, heat conduction, shockproof, sealing and corrosion resistance. In this embodiment, by filling the potting glue 70, it can further play the role of blocking the battery cell 20. When the single battery cell 20 has thermal runaway, the potting glue 70 is not easily melted by high temperature, thereby preventing the other surrounding battery cells 20 from having chain thermal runaway; at the same time, the potting glue 70 can form an integrated structure with other components of the module, and can also improve the overall structural strength of the battery module 100; of course, the potting glue 70 set in this embodiment also has the functions of heat conduction, shockproof, insulation, sealing and corrosion resistance.

[0055] In addition, it should be noted that in order to better realize the filling of the potting glue 70 and form an integrated potting structure, the battery module 100 may also include a first side plate and a second side plate (not shown in the figure), and the first side plate and the second side plate are respectively located on both sides of the multiple battery cells 20, specifically on both sides of the multiple heat-conducting parts 40, and the first side plate is simultaneously connected to the first end plate 50 and the second end plate 60. Correspondingly, the second side plate is also simultaneously connected to the first end plate 50 and the second end plate 60, thereby forming a frame structure connected end to end in sequence, thereby facilitating the potting glue 70 to fill the gaps between the end plate and the battery cell 20, between the side plate and the battery cell 20, between the battery cell 20 and the battery cell 20, and between the battery cell 20 and the heat-conducting part 40.

[0056] In summary, the embodiments of the present invention provide a battery module 100, a battery pack 1100 and a new energy vehicle 1000. The battery module 100 includes a base plate 10, a cover plate 30, a plurality of battery cells 20 and a plurality of heat-conducting members 40. The plurality of battery cells 20 are arranged on the base plate 10, and the plurality of battery cells 20 are bonded to the base plate 10; the cover plate 30 is arranged on a side of the plurality of battery cells 20 away from the base plate 10, and the cover plate 30 is bonded to the plurality of battery cells 20; the plurality of heat-conducting members 40 are all arranged between the base plate 10 and the cover plate 30, and both sides of each battery cell 20 are in contact with the heat-conducting member 40. Since the cover plate 30 and the bottom plate 10 are both sheet-like plates and are respectively bonded and fixed to the top and bottom of the battery cell 20, more of the side of the battery cell 20 can be exposed. In this way, the thermal conductor 40 can cover more of the side of the battery cell 20, that is, increase the contact area with the surface of the battery cell 20, thereby increasing the heat dissipation area of ​​the battery cell 20, thereby reducing the risk of chain thermal runaway of the surrounding battery cells 20 and improving the safety of the module.

[0057] The battery pack 1100 includes the battery module 100 , and has all the functions and beneficial effects of the battery module 100 .

[0058] The new energy vehicle 1000 includes a battery pack 1100 , which has all the functions and beneficial effects of the battery pack 1100 .

[0059] The above description is only a specific embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A battery module, characterized in that: include: Bottom plate (10); A plurality of battery cells (20), wherein the plurality of battery cells (20) are arranged on the base plate (10), and the plurality of battery cells (20) are bonded to the base plate (10); a cover plate (30), the cover plate (30) being arranged on a side of the plurality of battery cells (20) away from the bottom plate (10), and the cover plate (30) being bonded to the plurality of battery cells (20); as well as A plurality of heat-conducting members (40), wherein the plurality of heat-conducting members (40) are arranged between the bottom plate (10) and the cover plate (30), and both sides of each of the battery cells (20) are in contact with the heat-conducting members (40).

2. The battery module according to claim 1, characterized in that: The bottom plate (10) is provided with a plurality of avoidance through holes (11), the plurality of avoidance through holes (11) are arranged in one-to-one correspondence with the plurality of battery cells (20), and the explosion-proof valves of the battery cells (20) are located in the avoidance through holes (11).

3. The battery module according to claim 1, characterized in that: The cover plate (30) is provided with a plurality of positive electrode through holes (31) and a plurality of negative electrode through holes (32), the plurality of positive electrode through holes (31) and the plurality of negative electrode through holes (32) being arranged in a one-to-one correspondence, and the positive electrode of the battery cell (20) is arranged in correspondence with the positive electrode through hole (31), and the negative electrode of the battery cell (20) is arranged in correspondence with the negative electrode through hole (32).

4. The battery module according to claim 1, characterized in that: The battery module (100) further comprises a first end plate (50) and a second end plate (60), wherein the first end plate (50) and the second end plate (60) are respectively arranged on both sides of the plurality of battery cells (20), and both ends of the plurality of heat conducting members (40) are respectively connected to the first end plate (50) and the second end plate (60).

5. The battery module according to claim 4, characterized in that: The first end plate (50) is arranged between the cover plate (30) and the bottom plate (10), and two ends of the first end plate (50) are respectively bonded to the cover plate (30) and the bottom plate (10); The second end plate (60) is arranged between the cover plate (30) and the bottom plate (10), and two ends of the second end plate (60) are respectively bonded to the cover plate (30) and the bottom plate (10).

6. The battery module according to claim 1, characterized in that: The bottom plate (10) is a mica plate.

7. The battery module according to claim 1, characterized in that: The cover plate (30) is a mica plate.

8. The battery module according to any one of claims 1 to 7, characterized in that: The battery module (100) further comprises a potting glue (70), and the potting glue (70) is filled between the plurality of battery cells (20) and between the battery cells (20) and the heat conducting member (40).

9. A battery pack, characterized in that: A battery module (100) comprising any one of claims 1 to 8.

10. A new energy vehicle, characterized in that: Includes the battery pack (1100) as claimed in claim 9.

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