Battery pack

Abstract

The invention discloses a battery pack which comprises a shell, a battery module and a cooling assembly, the battery module and the cooling assembly are arranged in the shell, the cooling assembly comprises a plurality of liquid cooling plates, the liquid cooling plates are used for cooling pole columns in the battery module, and air bags are further arranged on the liquid cooling plates; when the battery is normally used, the air bag is used for elastically supporting and limiting the liquid cooling plate, so that the liquid cooling plate is stably attached to the pole end of the battery module, and the cooling effect on the battery is further ensured; meanwhile, when the battery is on fire, the safety of the battery can be ensured by releasing inert gas through breaking of the airbag.

Description

Technical Field

[0001] The present invention relates to the technical field of battery packs, and in particular to a battery pack pole cooling method. Background Art

[0002] The existing liquid cooling plate is generally set at the bottom or top of the battery cell module, or is set at intervals between the battery cells and is in contact with the largest surface of the battery cell for cooling. That is, it does not cool one side of the pole. Since the place where the battery generates the most heat during the charging and discharging process is at the pole position, if the liquid cooling plate is set on other sides of the battery cell, the cooling effect on the battery is not obvious. For this reason, we propose a battery pack. Summary of the invention

[0003] The object of the present invention is to provide a battery pack to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: comprising a housing and a battery module and a cooling assembly arranged in the housing, wherein the cooling assembly comprises a liquid cooling plate, wherein the liquid cooling plate is a plurality of plates for cooling the poles in the battery module, and an air bag is also arranged on the liquid cooling plate;

[0005] By setting the liquid cooling plate on one side of the battery module pole, the pole can be directly cooled, and the point where the battery module generates the most heat can be cooled first, further ensuring the cooling effect on the battery.

[0006] Preferably, the airbag is installed on the side of the liquid cooling plate away from the battery module to elastically limit the liquid cooling plate in the housing;

[0007] That is, the liquid cooling plate is elastically supported by the airbag, ensuring that the liquid cooling plate is stably fitted to the pole end of the battery module, so that the liquid cooling plate can quickly cool the battery, while avoiding damage to the liquid cooling plate or the battery module due to excessive squeezing force. Finally, when the battery shakes, the airbag can also prevent the liquid cooling plate from making hard contact with the outer frame, which may cause damage to the liquid cooling plate.

[0008] Preferably, the airbag has a high temperature rupture threshold, and when the battery module catches fire, the airbag ruptures and releases the internal inert gas;

[0009] When the battery catches fire, the airbag ruptures to release inert gas, thereby isolating the oxygen in the box and preventing the fire from spreading further.

[0010] Preferably, the cooling assembly further comprises a cooling pipeline, wherein the cooling pipeline is arranged above the liquid cooling plate and communicated with the liquid cooling plate so that the cooling liquid circulates in the liquid cooling plate;

[0011] That is, the coolant is caused to circulate in multiple liquid cooling plates through the cooling pipeline to ensure the cooling effect on the battery module.

[0012] Preferably, the cooling pipeline is further provided with a rotary joint, and the cooling pipeline is connected with the liquid cooling plate through the rotary joint;

[0013] That is, when the battery module catches fire, the cold liquid plate can rotate relative to the cooling pipeline due to the rotary joint, so as to avoid damage to the liquid cooling plate caused by the large heat generated when the battery catches fire;

[0014] Preferably, an elastic member is further provided on the side of the liquid cooling plate away from the battery module, and when the liquid cooling plate is in a vertical state, the elastic member is in a stretched state;

[0015] When the battery catches fire, the liquid cooling plate is pulled by the elastic member to rotate around the cooling pipeline through the rotary joint away from the battery module, thereby damaging the liquid cooling plate due to adhesion to the battery module.

[0016] Preferably, the battery module is bonded to the bottom of the shell, the battery module includes a plurality of battery core units, and the battery core unit includes a plurality of battery cores bonded and fixed to each other;

[0017] At the same time, by directly bonding the battery module to the base plate, other fixing methods such as bolts are avoided, that is, by reducing the number of parts, the volume utilization is improved.

[0018] Preferably, an integrated cover plate is welded at the pole end of the battery cell unit, and the integrated cover plate includes an integrated cover plate base, an FPC connecting sheet, and an aluminum bar which are welded in sequence;

[0019] That is, multiple single battery cells are assembled in series and parallel through an integrated cover plate, and the battery cell unit is also fixed again by welding the integrated cover plate to ensure stable connection of multiple battery cells in the battery cell unit.

[0020] Preferably, a thermal pad is provided on the side of the liquid cooling plate close to the battery module;

[0021] The heat generated by the battery module pole is quickly transferred to the liquid cooling plate through the thermal conductive pad, so as to achieve rapid cooling of the battery module and improve the cooling efficiency.

[0022] Preferably, a groove adapted to the pole is provided on the thermal pad;

[0023] That is, by providing grooves on the thermal pad, the battery module is completely fitted, thereby further ensuring the cooling effect on the battery module.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] When the battery is in normal use, the airbag is used to elastically support and limit the liquid cooling plate to ensure that the liquid cooling plate and the battery module pole end are stably fitted, further ensuring the cooling effect of the battery; at the same time, when the battery catches fire, the airbag can rupture to release inert gas to ensure battery safety;

[0026] At the same time, by directly bonding the battery module to the base plate, other fixing methods such as bolts are avoided, that is, by reducing the number of parts, the volume utilization is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 An exploded view of the overall structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the structure of the liquid cooling plate of the present invention;

[0029] Figure 3 It is a schematic diagram of the battery module structure of the present invention;

[0030] Figure 4 An exploded view of the battery module structure of the present invention;

[0031] Figure 5 An exploded view of the cooling assembly structure of the present invention;

[0032] Figure 6 It is a cross-sectional view of a battery pack in the first embodiment of the present invention;

[0033] Figure 7 For the present invention Figure 6 A partial enlarged view of

[0034] Figure 8 A cross-sectional view of a battery pack in a second embodiment of the present invention;

[0035] Fig. 9 For the present invention Figure 8 A partial enlarged view of B;

[0036] Reference numerals:

[0037] Battery pack 100, cooling assembly 200, battery module 300, liquid cooling plate 212, thermal pad 211, air bag 213, battery cell 330, integrated cover base 311, aluminum bar 312, FPC connector 313, cooling pipe 220, integrated cover 310 DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0039] See also Figure 1-Figure 9 The present invention provides a technical solution: the shell 100 is formed by welding an outer frame and a bottom plate, a battery module 300 and a cooling assembly 200 are arranged in the shell 100, the battery module 300 is bonded to the bottom plate, the cooling assembly 200 includes a plurality of liquid cooling plates 212, the liquid cooling plates 212 are vertically arranged on the bottom plate and located on one side of the pole of the battery module 300, and an air bag 213 is also provided on the liquid cooling plate 212.

[0040] The present invention can directly cool the pole by arranging the liquid cooling plate 212 on one side of the pole of the battery module 300, and further can cool the location where the battery module 300 generates the most heat, thereby further ensuring the cooling effect on the battery;

[0041] At the same time, by directly bonding the battery module to the base plate, other fixing methods such as bolts are avoided, that is, by reducing the number of parts, the volume utilization rate is improved;

[0042] In a further embodiment, the liquid cooling plate 212 is fixed to the outer frame by an air bag 213 .

[0043] That is, the liquid cooling plate 212 is elastically limited by the airbag 213, that is, the liquid cooling plate 212 is ensured to be stably fitted on the pole end of the battery module 300, so that the liquid cooling plate 212 can quickly cool the battery, while avoiding damage to the liquid cooling plate or the battery module due to excessive squeezing force. Finally, when the battery shakes, the airbag 213 can also be used to avoid hard contact between the liquid cooling plate 212 and the outer frame, which may cause damage to the liquid cooling plate 212.

[0044] In a further embodiment, the airbag 213 is made of a material that is not resistant to high temperatures and has a high temperature rupture threshold, and when the battery catches fire, the airbag ruptures to release inert gas; or the airbag (213) ruptures when the battery catches fire in other ways that can be achieved in the prior art;

[0045] When the battery catches fire, the airbag 213 ruptures to release inert gas, thereby isolating the oxygen in the box and preventing the fire in the box from further spreading;

[0046] In the first embodiment, a flow channel for circulating cooling liquid is provided in the liquid cooling plate 212, and a liquid inlet nozzle and a liquid outlet nozzle connected to the flow channel are provided on the top of the liquid cooling plate 212. The cooling pipeline 220 includes a liquid inlet pipe and a liquid outlet pipe which are provided up and down and connected to the outside. The liquid inlet pipe is fixedly connected to the liquid inlets above the multiple liquid cooling plates 212, and the liquid outlet pipe is fixedly connected to the liquid outlet nozzles above the multiple liquid cooling plates 212. The liquid inlet on the liquid inlet pipe and the liquid outlet on the liquid outlet pipe are located on the same side.

[0047] That is, the coolant enters the liquid inlet pipe and gradually flows into the flow channel of the liquid cooling plate 212 through the liquid inlet nozzle for liquid cooling, and then flows out to the liquid outlet pipe through the liquid outlet nozzle, that is, the coolant circulates in the liquid cooling plate to cool the pole.

[0048] The second embodiment is different from the previous embodiment in that the liquid inlet pipe is rotatably connected to the liquid inlet nozzles above the multiple liquid cooling plates 212, the liquid outlet pipe is rotatably connected to the liquid outlet nozzles above the multiple liquid cooling plates 212, and the liquid inlet on the liquid inlet pipe and the liquid outlet on the liquid outlet pipe are located on the same side.

[0049] In a further embodiment, the liquid inlet pipe is connected to the liquid inlet nozzle via a first rotary joint, and the liquid outlet pipe is connected to the liquid outlet nozzle via a second rotary joint;

[0050] That is, when the battery module catches fire, the cold liquid plate can rotate relative to the liquid inlet pipe due to the rotary joint, so as to avoid damage to the liquid cold plate caused by the large heat generated when the battery catches fire;

[0051] In a further embodiment, an elastic member 214 is provided between the side of the liquid cooling plate 212 away from the battery module 300 and the inner wall of the shell, and when the liquid cooling plate 212 is in a vertical state, the elastic member 214 is in a stretched state;

[0052] That is, when the battery is in normal use, the airbag 213 is arranged between the liquid cooling plate 212 and the inner wall of the shell 100, that is, the liquid cooling plate 212 is flexibly limited so that the liquid cooling plate 212 fits with the battery module 300, and the elastic member 214 is in a stretched state at this time; then, when the battery module 300 catches fire, the airbag 213 ruptures to release the inert gas to extinguish the fire and ensure the safety of the battery pack; at the same time, because the airbag 213 ruptures and cannot support the liquid cooling plate 212, the elastic member 214 drives the liquid cooling plate 212 to rotate away from the battery module 300, thereby preventing the liquid cooling plate 212 from fitting with the burning battery module, and causing certain damage to the liquid cooling plate 212;

[0053] In a further embodiment, the battery module 300 includes a plurality of battery cell units, and the battery cell unit includes a plurality of battery cells 330 bonded and fixed to each other, and the number of the battery cell units corresponds to the number of the liquid cooling plates 212;

[0054] That is, the battery cells 330 are fixed to each other by double-sided adhesive, so that the battery cell units are stably fixed and the cooling effect of the liquid cooling plate 212 on the battery cell units is guaranteed; at the same time, the liquid cooling plate 212 corresponds to the battery cell unit one by one to ensure the cooling efficiency of the battery.

[0055] In a further embodiment, an integrated cover plate 310 is welded at the pole end of the battery cell unit, and the integrated cover plate 310 includes an integrated cover plate base 311, an aluminum bar 312, and an FPC connecting sheet 313 which are welded in sequence;

[0056] That is, a plurality of single battery cells are assembled in series and in parallel through the integrated cover plate 310 , and the battery cell unit is also fixed again by welding the integrated cover plate 310 to ensure that the plurality of battery cells 330 in the battery cell unit are stably connected.

[0057] In a further embodiment, a thermal pad 211 is provided on the side of the liquid cooling plate 212 close to the battery module 300;

[0058] The heat generated by the pole of the battery module 300 is quickly transferred to the liquid cooling plate 212 through the thermal pad 211, so as to achieve rapid cooling of the battery module 300 and improve the cooling efficiency.

[0059] In a further embodiment, a groove adapted to the pole is provided on the thermal pad 211;

[0060] That is, the battery module 300 is completely fitted by providing a groove on the thermal pad 211 , thereby further ensuring the cooling effect on the battery module 300 .

[0061] The working principle of the present invention is as follows: when the battery module 300 is in normal use, the battery module 300 is elastically supported and limited by the airbag 213, thereby ensuring that the liquid cooling plate 212 is in full contact with and cooled by the battery module 300, while avoiding damage to the liquid cooling plate or the battery module due to excessive squeezing force; when the battery catches fire, the inert gas is released by the rupture of the airbag 213, while the elastic member 214 drives the liquid cooling plate 212 to rotate away from the battery module 300, thereby avoiding the liquid cooling plate 212 from still contacting the burning battery module 300 and causing damage to the liquid cooling plate.

[0062] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art 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 appended claims and their equivalents.

Claims

1. A battery pack, comprising a housing (100), a battery module (300) and a cooling assembly (200) arranged in the housing (100), characterized in that: The cooling assembly (200) comprises a liquid cooling plate (212), the liquid cooling plate (212) being multiple and used for cooling the poles in the battery module (300), and an air bag (213) is also provided on the liquid cooling plate (212).

2. A battery pack according to claim 1, characterized in that: The air bag (213) is installed on a side of the liquid cooling plate (212) away from the battery module (300) to elastically limit the position of the liquid cooling plate (212) in the housing (100).

3. A battery pack according to claim 1, characterized in that: The airbag (213) has a high temperature rupture threshold, and when the battery module (300) catches fire, the airbag (213) ruptures and releases the internal inert gas.

4. A battery pack according to claim 1, characterized in that: The cooling assembly (200) further comprises a cooling pipeline (220), wherein the cooling pipeline (220) is arranged above the liquid cooling plate (212) and is in communication with the liquid cooling plate (212) so that the cooling liquid circulates in the liquid cooling plate (212).

5. A battery pack according to claim 4, characterized in that: The cooling pipeline (220) is also provided with a rotary joint, and the cooling pipeline (220) is connected to the liquid cooling plate (212) via the rotary joint.

6. A battery pack according to claim 1, characterized in that: An elastic member (214) is also provided on a side of the liquid cooling plate (212) away from the battery module (300), and when the liquid cooling plate (212) is in a vertical state, the elastic member (214) is in a stretched state.

7. A battery pack according to claim 1, characterized in that: The battery module (300) is bonded to the bottom of the housing (100), and the battery module (300) comprises a plurality of battery core units, and the battery core units comprise a plurality of bonded and fixed battery cores (330).

8. A battery pack according to claim 7, characterized in that: An integrated cover plate (310) is welded to the pole end of the battery cell unit, and the integrated cover plate (310) comprises an integrated cover plate base (311), an FPC connecting sheet (313), and an aluminum bar (312) which are welded in sequence.

9. The battery pack according to claim 1, characterized in that: A heat conducting pad (211) is provided on one side of the liquid cooling plate (212) close to the battery module (300).

10. A battery pack according to claim 9, characterized in that: The heat conductive pad (211) is provided with a groove adapted to the pole.

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