Battery pack capable of being heated at low temperature

Abstract

The utility model relates to the technical field of battery packs, and discloses a low-temperature heatable battery pack which comprises a battery pack shell, a plurality of groups of battery jars and liquid heating channels are arranged in the battery pack shell, and a battery unit is arranged in each group of battery jars; through the cooperation of the liquid heating structure, the heat conduction structure and the battery pack shell, liquid flows through the drainage frame and the heat exchange plate, and heat is uniformly transferred into the liquid through the main heating wire, the secondary heating wire and the sub heating wire in the heat conduction structure, so that the heating liquid uniformly heats each part of the battery unit; according to the invention, uniform heating and accurate temperature control of the battery units are realized, stable performance of the battery in a low-temperature environment is ensured, the temperature difference between the battery units is reduced through uniform heating and accurate temperature control, battery performance degradation caused by uneven temperature is avoided, and the service life of the battery is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery pack technical field, concretely is a low temperature can heated battery pack. BACKGROUND

[0002] The existing power battery will obviously drop in low temperature environment, and when the temperature is low in winter, the car with power battery pack will be parked outside for a whole night, the battery temperature will drop quickly, which will cause the car cannot start immediately, and the battery needs to be heated, which will cause the available power to reduce when driving.

[0003] The battery pack is generally provided with one or more battery units, each battery unit is combined by many batteries, and the battery units are heated by the heating film or heating plate arranged in the battery pack, which may not be uniform, causing the temperature of some battery cells to be too high and the temperature of other battery cells to be insufficient, resulting in a large temperature difference of the battery unit, which will affect the consistency and life of the battery in the battery unit, so a low temperature heated battery pack is needed. SUMMARY

[0004] The utility model discloses a low temperature can heated battery pack, which is arranged between the gaps of the battery units, further improves the heat transfer efficiency, and adopts the circulating heating liquid of the liquid heat structure to realize the uniform heating of the battery units, thereby improving the heating efficiency of the battery units, so as to solve the problems in the background technology.

[0005] To achieve the above object, the utility model provides the following technical scheme: a low temperature can heated battery pack, which comprises a battery pack shell, a plurality of battery grooves and a liquid heat channel are arranged in the battery pack shell, a battery unit is arranged in each battery groove, a liquid heat structure and a heat conduction structure are arranged in the liquid heat channel, and the heat conduction structure is arranged in the liquid heat structure.

[0006] The heat conduction structure comprises a main heating wire, a plurality of secondary heating wires are arranged on one side of the main heating wire, and a plurality of sub-heating wires are arranged on each secondary heating wire.

[0007] The liquid heat structure comprises a plurality of drainage frames, a connecting pipe is arranged between two adjacent drainage frames, a connecting plate is arranged between two oppositely arranged drainage frames, a liquid inlet pipe is arranged on one of the drainage frames, a circulating pump is arranged at one end of the liquid inlet pipe, a liquid outlet pipe is arranged on the other drainage frame, and the liquid outlet pipe and the circulating pump are both communicated with a heating box.

[0008] Preferably, the drainage frame comprises a liquid inlet plate, a plurality of heat exchange plates and a liquid outlet plate, the plurality of heat exchange plates are arranged between the liquid inlet plate and the liquid outlet plate, the plurality of heat exchange plates are arranged at equal intervals, and the plurality of sub-heating wires are arranged in the cavities of the heat exchange plates.

[0009] Preferably, one end of the main heating wire is provided with a connecting wire, the plurality of sub-heating wires are arranged at equal intervals, and the plurality of sub-heating wires are arranged on the same plane.

[0010] Preferably, the plurality of battery grooves are arranged alternately with the plurality of heat exchange plates, and the inner walls of the battery grooves are provided with heating films.

[0011] Preferably, the top of the battery pack shell is provided with a battery cover plate, the top of the battery pack shell is provided with an air inlet hole, the air inlet hole is provided with a cooling fan, and the upper surface of the battery cover plate is provided with a through hole.

[0012] Preferably, the periphery of the battery pack shell is provided with an air outlet channel communicated with the air inlet hole, and the cross section of the air outlet channel is arranged in a cross shape.

[0013] Preferably, the air outlet channel is provided with a plurality of cooling fins on both sides, and the plurality of cooling fins are arranged at equal intervals.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The liquid flows through the drainage frame and the heat exchange plates, the heat is uniformly transmitted to the liquid through the main heating wire, the sub-heating wire and the sub-heating wire in the heat conduction structure, and then the heated liquid uniformly heats each part of the battery unit, so that the battery unit is uniformly heated and precisely controlled in temperature, the performance stability of the battery in a low temperature environment is ensured, the temperature difference between the battery units is reduced through uniform heating and precise temperature control, the performance degradation of the battery caused by uneven temperature is avoided, and the service life of the battery is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a battery pack shell structure schematic view of the utility model;

[0017] Figure 2 It is a heating film structure schematic view of the utility model;

[0018] Figure 3 It is a structure schematic view of the liquid heat structure and the heat conduction structure of the utility model;

[0019] Figure 4 It is a structure schematic view of the liquid heat structure of the utility model;

[0020] Figure 5 It is a structural schematic view of the heat conduction structure.

[0021] In the figure: 1, battery pack shell; 2, battery cover plate; 3, battery groove; 4, battery unit; 5, air inlet hole; 6, cooling fan; 7, exhaust passage; 8, cooling fin; 9, liquid heat structure; 91, drainage frame; 911, liquid inlet plate; 912, heat exchange plate; 913, liquid outlet plate; 92, connecting pipe; 93, connecting plate; 94, liquid inlet pipe; 95, circulating pump; 96, liquid outlet pipe; 97, heating box; 10, heat conduction structure; 101, connecting wire; 102, main heating wire; 103, secondary heating wire; 104, sub-heating wire; 11, heating film; 12, liquid heat passage. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0023] Please refer to Figures 1-5 The utility model provides a kind of technical scheme: a low-temperature battery pack that can be heated, including battery pack shell 1, battery pack shell 1 inside is provided with multiple groups of battery groove 3 and liquid heat passage 12, each group of battery groove 3 is provided with battery unit 4, and liquid heat passage 12 is provided with liquid heat structure 9 and heat conduction structure 10, and heat conduction structure 10 is arranged inside liquid heat structure 9.

[0024] Heat conduction structure 10 includes main heating wire 102, and one side of main heating wire 102 is provided with multiple groups of secondary heating wire 103, and each group of secondary heating wire 103 is provided with multiple groups of sub-heating wire 104.

[0025] Liquid heat structure 9 includes multiple groups of drainage frame 91, and connecting pipe 92 is arranged between adjacent two groups of drainage frame 91, and connecting plate 93 is arranged between two groups of drainage frame 91 arranged oppositely, one group of drainage frame 91 is provided with liquid inlet pipe 94, one end of liquid inlet pipe 94 is provided with circulating pump 95, another group of drainage frame 91 is provided with liquid outlet pipe 96, and heating box 97 is communicated with circulating pump 95.

[0026] The drainage frame 91 comprises a liquid inlet plate 911, a plurality of heat exchange plates 912, and a liquid outlet plate 913. The plurality of heat exchange plates 912 are arranged between the liquid inlet plate 911 and the liquid outlet plate 913, and are arranged at equal intervals. The plurality of sub-heating wires 104 are arranged in the cavities of the heat exchange plates 912. Through the combination of the liquid heating structure 9 and the heat conduction structure 10, uniform heating of the battery unit 4 is achieved, and the problems of local overheating or uneven heating caused by the traditional heating film 11 or heating plate are avoided.

[0027] One end of the main heating wire 102 is provided with a connecting wire 101. The plurality of sub-heating wires 103 are arranged at equal intervals and in the same plane. The sub-heating wires 103 and the sub-heating wires 104 of the heat conduction structure 10 can further heat the liquid in the liquid heating structure, so that the liquid uniformly heats the battery unit 4, improves the uniformity of heating, and optimizes the heat transfer path of the drainage frame 91 and the heat exchange plate 912 in the liquid heating structure 9, further improving the heating effect.

[0028] The battery grooves 3 are arranged alternately with the plurality of heat exchange plates 912. The inner walls of each battery groove 3 are provided with a heating film 11. The circulating pump 95 and the heating box 97 in the liquid heating structure 9 can accurately control the temperature and flow of the heating liquid according to the feedback of the temperature sensor (not shown in the figure, and the temperature sensor is prior art, which will not be described in detail) inside the battery pack shell 1, so as to ensure that the battery pack quickly heats up and maintains a suitable working temperature in a low-temperature environment. The heating film 11 on the inner wall of the battery groove 3 also works at the same time, further ensuring the uniform heating of the battery unit 4.

[0029] The top of the battery pack shell 1 is provided with a battery cover plate 2. The top of the battery pack shell 1 is provided with an air inlet hole 5. The air inlet hole 5 is provided with a cooling fan 6. The upper surface of the battery cover plate 2 is provided with a through hole. In a high-temperature environment, the cooling fan 6 introduces external cold air into the battery pack through the air inlet hole 5. The cold air flows through the exhaust air passage 7 to take away the heat inside the battery pack, improving the cooling effect.

[0030] The four sides of the battery pack shell 1 are provided with exhaust air passages 7 which are in communication with the air inlet hole 5. The cross section of the exhaust air passage 7 is in the shape of a cross. It can effectively dissipate heat in a high-temperature environment and avoid overheating of the battery.

[0031] A plurality of heat dissipation fins 8 are arranged on both sides of the inner cavity of the exhaust air passage 7. The plurality of heat dissipation fins 8 are arranged at equal intervals. The design of the heat dissipation fins 8 increases the heat dissipation area and further improves the heat dissipation efficiency.

[0032] In use, when the battery pack is in a low-temperature environment, the heating box 97 in the liquid heating structure 9 starts to work, heats the liquid (such as a glycol solution), and delivers the heated liquid to the liquid heating channel 12 through the circulating pump 95; the heated liquid flows through the drainage frame 91 and the heat exchange plate 912, and the heat is uniformly transmitted to each part of the battery cell 4 through the main heating wire 102, the secondary heating wire 103 and the sub-heating wire 104 in the heat conduction structure 10; the heating film 11 on the inner wall of the battery tank 3 also works at the same time, further ensuring the uniform heating of the battery cell 4; when the temperature of the battery cell 4 is lower than the set value, the heating box 97 and the circulating pump 95 will continue to work until the temperature of the battery reaches the appropriate range; if the temperature of the battery is too high, the cooling fan 6 and the cooling fins 8 will start to work, and the heat is discharged through the air inlet hole 5 and the air outlet channel 7, so that the temperature of the battery pack is kept in a safe range, and the performance of the battery in a low-temperature environment is ensured to be stable.

[0033] Although the embodiments of the present application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A low temperature heatable battery pack comprising a battery pack housing (1), characterized in that: The battery pack shell (1) is internally provided with a plurality of battery grooves (3) and a liquid-heat channel (12), each of the battery grooves (3) is internally provided with a battery unit (4), the liquid-heat channel (12) is internally provided with a liquid-heat structure (9) and a heat-conducting structure (10), and the heat-conducting structure (10) is arranged inside the liquid-heat structure (9); The heat-conducting structure (10) comprises a main heating wire (102), a plurality of secondary heating wires (103) are arranged on one side of the main heating wire (102), and a plurality of sub-heating wires (104) are arranged on each of the secondary heating wires (103); The liquid-heat structure (9) comprises a plurality of drainage frames (91), a connecting pipe (92) is arranged between two adjacent drainage frames (91), a connecting plate (93) is arranged between two oppositely arranged drainage frames (91), one of the drainage frames (91) is provided with an inlet pipe (94), one end of the inlet pipe (94) is provided with a circulating pump (95), the other of the drainage frames (91) is provided with an outlet pipe (96), and the inlet pipe (94) and the outlet pipe (96) are both in communication with a heating box (97).

2. The cryogenically heatable battery pack of claim 1, wherein: The drainage frame (91) comprises an inlet plate (911), a plurality of heat exchange plates (912) and an outlet plate (913), the plurality of heat exchange plates (912) are arranged between the inlet plate (911) and the outlet plate (913), the plurality of heat exchange plates (912) are arranged at equal intervals, and the plurality of sub-heating wires (104) are arranged in the inner cavities of the heat exchange plates (912).

3. The cryogenically heatable battery pack of claim 2, wherein: One end of the main heating wire (102) is provided with a connecting wire (101), and the plurality of secondary heating wires (103) are arranged at equal intervals and in the same plane.

4. The cryogenically heatable battery pack of claim 3, wherein: The plurality of battery grooves (3) are alternately arranged with the plurality of heat exchange plates (912), and the inner wall of each of the battery grooves (3) is provided with a heating film (11).

5. The cryogenically heatable battery pack of claim 4, wherein: The top of the battery pack shell (1) is provided with a battery cover plate (2), the top of the battery pack shell (1) is provided with an air inlet hole (5), the air inlet hole (5) is provided with a heat dissipation fan (6), and the upper surface of the battery cover plate (2) is provided with a through hole.

6. The cryogenically heatable battery pack of claim 5, wherein: The periphery of the battery pack shell (1) is provided with an air outlet channel (7) in communication with the air inlet hole (5), and the cross section of the air outlet channel (7) is arranged in a cross shape.

7. The cryogenically heatable battery pack of claim 6, wherein: A plurality of heat dissipation fins (8) are arranged on both sides of the inner cavity of the air outlet channel (7), and the plurality of heat dissipation fins (8) are arranged at equal intervals.

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