New energy automobile battery pack working consistency adjusting device

Abstract

The invention discloses a new energy automobile battery pack working consistency adjusting device, and belongs to the technical field of new energy automobile battery packs, and the new energy automobile battery pack working consistency adjusting device comprises a battery pack main body and a cooling heat dissipation device which are mounted at the bottom of a new energy automobile; a plurality of heat preservation grooves are formed in the battery pack main body, battery main bodies are arranged in the heat preservation grooves, a plurality of groups of battery main bodies are connected in series, cooling pipelines are wound on the battery main bodies, and heating pipelines surrounding the circumferential directions of the battery main bodies are arranged on the inner sides of the heat preservation grooves; the cooling and heat dissipation device is used for cooling and heat dissipation of the battery main bodies at the head end and the tail end of the battery pack main body at the high temperature exceeding the first threshold value and cooling and heat dissipation of other battery main bodies at the high temperature exceeding the third threshold value, so that the temperature difference between different battery main bodies is controlled within a reasonable range; the consistency of the battery main bodies in the battery pack main body is ensured, so that the overall performance of the battery pack main body is stable, and the performance, the service life and the cost of the battery pack are balanced.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicle battery packs, and in particular to a device for adjusting the working consistency of a new energy vehicle battery pack. Background Art

[0002] The battery pack design of new energy vehicles usually contains multiple batteries, which can be combined in series or parallel to meet the vehicle's voltage and current requirements. Series connection can increase the output power of the battery pack. If the operating temperature of the battery in the battery pack is too low or too high, it will affect the performance and life of the entire battery. If the temperature is too high for a long time, the cycle life of the power battery will be greatly reduced, and there will be safety hazards of thermal runaway. If used for a long time at temperatures below zero or lower, the battery is prone to irreversible lithium deposition during charging, which will damage the battery and may even cause crystals to pierce the diaphragm and cause an internal short circuit.

[0003] At the same time, the working status of the batteries is different, so different batteries have temperature differences. If the temperature difference of the batteries is too large, it will affect the short board effect inside the battery pack, resulting in poor consistency of the battery pack. The existing battery pack uses a phase change heat storage device to uniformly heat or dissipate heat for the entire battery pack, which means that it cannot accurately control the temperature. Instead, it ignores the temperature of other batteries in order to keep a battery with too high temperature. In the middle and late stages of the use of the battery pack, the status of different batteries will be different, and the temperature difference between them may increase. For the safety of a certain battery, forcibly heating or cooling all batteries at the same time will make the battery consistency worse.

[0004] When the batteries in a battery pack are connected in series, the batteries at both ends will be subjected to a large voltage difference. Especially when the battery performance in the battery pack is inconsistent, this voltage difference may cause the batteries at both ends to bear a greater burden, making them more susceptible to damage. In order to maintain the overall stability of the battery pack, all batteries need to be replaced at the same time, which undoubtedly increases the maintenance cost. Therefore, it is necessary to design a working consistency adjustment device for new energy vehicle battery packs. Summary of the invention

[0005] The purpose of the present invention is to provide a device for adjusting the working consistency of a battery pack of a new energy vehicle to solve the problems raised in the above-mentioned background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a device for adjusting the working consistency of a battery pack of a new energy vehicle, comprising a battery pack main body and a cooling and heat dissipation device installed at the bottom of the new energy vehicle;

[0007] A plurality of heat preservation tanks are provided in the battery pack body, in which battery bodies are provided, and a plurality of groups of battery bodies are connected in series, a cooling pipe is wound around the battery bodies, a heating pipe is provided inside the heat preservation tanks and surrounds the battery bodies, and a temperature sensor is provided on each group of battery bodies;

[0008] The cooling and heat dissipation device comprises a cooling and heat dissipation tank, a liquid inlet mechanism and a liquid outlet mechanism, wherein the cooling and heat dissipation tank is arranged outside the battery pack body, the liquid inlet mechanism is communicated with the cooling pipe inlet and inputs the coolant in the cooling and heat dissipation tank into the cooling pipe, and the liquid outlet mechanism is communicated with the cooling pipe outlet and returns the coolant in the cooling pipe to the cooling and heat dissipation tank;

[0009] When the temperature sensor detects that the operating temperature of the battery bodies at both ends of the battery bodies connected in series in the battery pack body rises to exceed the first threshold, the cooling and heat dissipation device works, and the liquid inlet mechanism inputs the coolant in the cooling and heat dissipation tank into the cooling pipes corresponding to the battery bodies at both ends to cool and dissipate the heat of the battery bodies, so that the temperature of the battery bodies drops to the second threshold;

[0010] When the temperature sensor detects that the temperature of other battery bodies between the battery bodies at the head and tail ends rises above a third threshold, the cooling and heat dissipation device cools and dissipates the other battery bodies so that the temperature of the other battery bodies drops to a second threshold.

[0011] In a further embodiment, the liquid inlet mechanism comprises a first liquid guide tank connected to the cooling and heat dissipation tank through a first connecting pipe, and the first liquid guide tank is provided with a plurality of liquid inlet pipes connected to the cooling pipe inlets in a one-to-one correspondence;

[0012] The liquid outlet mechanism comprises a second liquid guide tank connected to the cooling and heat dissipation tank through a first connecting pipe, and the second liquid guide tank is provided with a plurality of liquid outlet pipes connected to the cooling pipe outlets in a one-to-one correspondence;

[0013] The first connecting pipe is provided with a first liquid guiding valve, and the liquid inlet pipe and the liquid outlet pipe are both provided with a second liquid guiding valve.

[0014] In a further embodiment, a heating and temperature-raising device is further included, which is installed at the bottom of the new energy vehicle. The heating and temperature-raising device includes a heater body, a heat supply mechanism and a recovery mechanism. The heater body is arranged on the outside of the battery pack body, the heat supply mechanism is connected to the heating pipe inlet and inputs the heat medium in the heater body into the heating pipe, and the recovery mechanism is connected to the heating pipe outlet and refluxes the heat medium in the heating pipe into the heater body.

[0015] In a further embodiment, the heating mechanism comprises a first storage tank connected to the heater body via a second connecting pipe, and the first storage tank is provided with a plurality of heat-conducting inlet pipes connected one-to-one with the inlets of the heating pipes;

[0016] The recovery mechanism comprises a second storage tank connected to the heater body through a second connecting pipe, and the second storage tank is provided with a plurality of heat conduction outlet pipes connected one-to-one with the outlets of the heating pipe;

[0017] The second connecting pipe is provided with a first heat conduction valve, and the heat conduction inlet pipe and the heat conduction outlet pipe are both provided with a second heat conduction valve.

[0018] In a further embodiment, when the new energy vehicle has not been driven for a long time and is in a low temperature environment waiting to be started, the temperature sensor detects that the operating temperature of several battery bodies connected in series in the battery pack body is lower than a second threshold value, the heating and temperature raising device works, and the heating mechanism inputs the heat medium stored in the heater body into the heating pipe to heat all the battery bodies, so that the temperature of all the battery bodies increases. When the temperature reaches the second threshold value, the new energy vehicle enters a start-up preparation state.

[0019] In a further embodiment, the first threshold is between the second threshold and the third threshold, the temperature difference between the first threshold and the second threshold is 10-15°, and the temperature difference between the third threshold and the first threshold is 10-12°.

[0020] In a further embodiment, the first threshold is 35°, the second threshold is 20°, and the third threshold is 45°.

[0021] In a further embodiment, the battery bodies are provided in 6-10 groups, and the battery bodies at the head and tail ends are provided in 1-2 groups respectively.

[0022] In a further embodiment, a start-up preheating tube is provided in the heat-conducting inlet tube, and the start-up preheating tube is electrically connected to a secondary battery plate provided on the outside of the battery pack body.

[0023] In a further embodiment, a mounting plate is provided on the battery body, and the temperature sensor is provided on the mounting plate.

[0024] Compared with the prior art, the beneficial effect achieved by the present invention is that the temperature difference between different battery bodies is controlled within a reasonable range by means of the cooling and heat dissipation device to cool and dissipate the battery bodies at the head and tail ends of the battery pack body at a high temperature exceeding a first threshold value, and to cool and dissipate the other battery bodies at a high temperature exceeding a third threshold value, thereby ensuring the consistency of the battery bodies in the battery pack body, stabilizing the overall performance of the battery pack body, and achieving a balance between the performance, life and cost of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 is a sectional view of an integral part of the present invention;

[0027] Figure 3 It is a schematic diagram of the installation structure of the startup preheating tube of the present invention;

[0028] Figure 4 It is a schematic diagram of the structure of the cooling and heat dissipation tank of the present invention;

[0029] Figure 5 It is a schematic diagram of the main structure of the heater of the present invention;

[0030] The accompanying drawings are marked as follows: battery pack body 1, insulation tank 2, battery body 3, heating pipe 4, cooling pipe 5, mounting plate 6, temperature sensor 7, cooling and heat dissipation tank 8, first liquid guide tank 9, second liquid guide tank 10, first liquid guide valve 11, liquid inlet pipe 12, liquid outlet pipe 13, second liquid guide valve 14, heater body 15, first storage tank 16, second storage tank 17, first thermal conduction valve 18, thermal conduction inlet pipe 19, thermal conduction outlet pipe 20, second thermal conduction valve 21, start preheating pipe 22. DETAILED DESCRIPTION

[0031] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0032] See also Figure 1-Figure 5 , the present invention provides a technical solution: a new energy vehicle battery pack working consistency adjustment device, comprising a battery pack main body 1 installed at the bottom of the new energy vehicle and a cooling and heat dissipation device;

[0033] A plurality of heat preservation tanks 2 are provided in the battery pack body 1, and a battery body 3 is provided in the heat preservation tank 2. A plurality of groups of battery bodies 3 are connected in series, and a cooling pipe 5 is wound around the battery body 3. A heating pipe 4 surrounding the battery body 3 is provided inside the heat preservation tank 2, and a temperature sensor 7 is provided on each group of battery bodies 3.

[0034] The cooling and heat dissipation device includes a cooling and heat dissipation tank 8, a liquid inlet mechanism and a liquid outlet mechanism. The cooling and heat dissipation tank 8 is arranged outside the battery pack body 1. The liquid inlet mechanism is connected to the inlet of the cooling pipe 5 and inputs the coolant in the cooling and heat dissipation tank 8 into the cooling pipe 5. The liquid outlet mechanism is connected to the outlet of the cooling pipe 5 and returns the coolant in the cooling pipe 5 to the cooling and heat dissipation tank 8.

[0035] The cooling and heat dissipation tank 8 is provided with a coolant storage area and an air cooling and heat dissipation area. The coolant is stored in the coolant storage area, and the fan in the air cooling and heat dissipation area cools down the coolant with increased temperature flowing back into the coolant storage area, thereby realizing a circulating cooling operation of the coolant.

[0036] When the temperature sensor 7 detects that the operating temperature of the battery bodies 3 at the head and tail ends of the plurality of battery bodies 3 connected in series in the battery pack body 1 rises to exceed the first threshold, the cooling and heat dissipation device operates, and the liquid inlet mechanism inputs the coolant in the cooling and heat dissipation tank 8 into the cooling pipes 5 corresponding to the battery bodies 3 at the head and tail ends to cool and dissipate the heat of the battery bodies 3, so that the temperature of the battery bodies 3 drops to the second threshold;

[0037] When the temperature sensor 7 detects that the temperature of other battery bodies 3 between the battery bodies 3 at the head and tail ends rises above the third threshold, the cooling and heat dissipation device cools and dissipates the other battery bodies 3 so that the temperature of other battery bodies 3 drops to the second threshold.

[0038] Through the above technical scheme, the cooling and heat dissipation device cools and dissipates the battery bodies 3 at the two ends of the battery pack main body 1 at a high temperature exceeding a first threshold, and cools and dissipates the other battery bodies 3 at a high temperature exceeding a third threshold, so that the temperature difference between different battery bodies 3 is controlled within a reasonable range, the consistency of the battery bodies 3 in the battery pack main body 1 is ensured, the overall performance of the battery pack main body 1 is stabilized, and thus a balance is achieved between the performance, life and cost of the battery pack.

[0039] In a further embodiment, the liquid inlet mechanism comprises a first liquid guide tank 9 connected to the cooling and heat dissipation tank 8 through a first connecting pipe, and the first liquid guide tank 9 is provided with a plurality of liquid inlet pipes 12 connected to the inlets of the cooling pipe 5 in a one-to-one correspondence;

[0040] The liquid outlet mechanism includes a second liquid guide tank 10 connected to the cooling and heat dissipation tank 8 through a first connecting pipe, and the second liquid guide tank 10 is provided with a plurality of liquid outlet pipes 13 connected to the outlets of the cooling pipe 5 in a one-to-one correspondence;

[0041] The first connecting pipe is provided with a first liquid guiding valve 11 , and the liquid inlet pipe 12 and the liquid outlet pipe 13 are both provided with a second liquid guiding valve 14 .

[0042] Through the above technical scheme, the coolant in the cooling and heat dissipation tank 8 is input into the first liquid guiding tank 9 through the cooperation of the first connecting pipe and the first liquid guiding valve 11, and the coolant input into the first liquid guiding tank 9 is input into the cooling pipe 5 through the cooperation of the liquid inlet pipe 12 and the second liquid guiding valve 14, so as to facilitate the cooling and heat dissipation of the battery body 3 in the insulation tank 2. The coolant after the reaction in the cooling pipe 5 flows back to the second liquid guiding tank 10 through the liquid outlet pipe 13, and then flows back to the cooling and heat dissipation tank 8 through the first connecting pipe.

[0043] In a further embodiment, a heating and temperature-raising device is also included, which is installed at the bottom of the new energy vehicle. The heating and temperature-raising device includes a heater body 15, a heat supply mechanism and a recovery mechanism. The heater body 15 is arranged on the outside of the battery pack body 1, and the heat supply mechanism is connected to the inlet of the heating pipe 4 and inputs the heat medium in the heater body 15 into the heating pipe 4. The recovery mechanism is connected to the outlet of the heating pipe 4 and refluxes the heat medium in the heating pipe 4 to the heater body 15.

[0044] Through the above technical solution, the heater body 15 cooperates with the heating mechanism and the recovery mechanism, so that when the new energy vehicle has not been driven for a long time and is in a low temperature environment to be started, the heat medium stored in the heater body 15 is input into the heating pipe 4 to heat all the battery bodies 3, so that the temperature of all the battery bodies 3 is increased, which is convenient for the start-up preparation of the new energy vehicle;

[0045] A heat medium storage tank is provided in the heater body 15, and heat medium is stored in the heat medium storage tank. A heating pipe is provided in the heat medium storage tank, and the heat medium with reduced temperature flowing back into the heat medium storage tank is heated by the heating pipe to realize the circulating heating operation of the heat medium. A battery electrically connected to the heating pipe is provided on the outside of the heater body 15, and the heating pipe is powered by the battery. The heat medium is water or oil.

[0046] In a further embodiment, the heating mechanism includes a first storage tank 16 connected to the heater body 15 through a second connecting pipe, and the first storage tank 16 is provided with a plurality of heat-conducting inlet pipes 19 connected one-to-one with the inlets of the heating pipe 4;

[0047] The recovery mechanism includes a second storage tank 17 connected to the heater body 15 through a second connecting pipe, and the second storage tank 17 is provided with a plurality of heat conduction outlet pipes 20 connected to the outlets of the heating pipe 4 in a one-to-one correspondence;

[0048] The second connecting pipe is provided with a first heat transfer valve 18 , and the heat transfer inlet pipe 19 and the heat transfer outlet pipe 20 are both provided with a second heat transfer valve 21 .

[0049] Through the above technical solution, the heat medium in the heater body 15 is input into the first storage tank 16 through the cooperation of the second connecting pipe and the first heat conduction valve 18, and the heat medium input into the first storage tank 16 is input into the heating pipe 4 through the cooperation of the heat conduction inlet pipe 19 and the second heat conduction valve 21, so as to heat and raise the temperature of the battery body 3 in the insulation tank 2. The heat medium after the reaction in the heating pipe 4 flows back to the second storage tank 17 through the heat conduction outlet pipe 20, and then flows back to the heater body 15 through the second connecting pipe.

[0050] In a further embodiment, when the new energy vehicle has not been driven for a long time and is in a low temperature environment waiting to be started, the temperature sensor 7 detects that the operating temperature of several battery bodies 3 connected in series in the battery pack body 1 is lower than the second threshold value, the heating and temperature raising device works, and the heating mechanism inputs the heat medium stored in the heater body 15 into the heating pipe 4 to heat all the battery bodies 3, so that the temperature of all the battery bodies 3 increases. When the temperature reaches the second threshold value, the new energy vehicle enters the start-up preparation state.

[0051] The above technical solution facilitates the start-up preparation of new energy vehicles that have not been driven for a long time and are in a low temperature environment.

[0052] In a further embodiment, the first threshold is between the second threshold and the third threshold, the temperature difference between the first threshold and the second threshold is 10-15°, and the temperature difference between the third threshold and the first threshold is 10-12°.

[0053] Through the above technical scheme, by setting the temperature difference between the third threshold and the first threshold, when the working temperature of several battery bodies 3 in the battery pack body 1 increases, the temperature of the battery bodies 3 at the head and tail ends increases quickly due to the large voltage difference subjected to the battery bodies 3 at the head and tail ends. In the process of the temperature of the battery bodies 3 at the head and tail ends rising to the third threshold, when the temperature of the battery bodies 3 at the head and tail ends rises to the first threshold, the heat is dissipated in advance at the head and tail ends, thereby ensuring the working consistency of the battery bodies 3.

[0054] In a further embodiment, the first threshold is 35°, the second threshold is 20°, and the third threshold is 45°.

[0055] Through the above technical solution, when the temperature sensor 7 detects that the operating temperature of the battery main body 3 at the head and tail ends of the battery main body 3 connected in series in the battery pack main body 1 rises by more than 35°, the cooling and heat dissipation device works, and the liquid inlet mechanism inputs the coolant in the cooling and heat dissipation tank 8 into the cooling pipes 5 corresponding to the battery main bodies 3 at the head and tail ends to cool and dissipate the battery main body 3, so that the temperature of the battery main body 3 drops to 20°;

[0056] When the temperature sensor 7 detects that the temperature of other battery bodies 3 between the battery bodies 3 at the head and tail ends rises by more than 45°, the cooling and heat dissipation device cools and dissipates the other battery bodies 3 so that the temperature of the other battery bodies 3 drops to 20°;

[0057] The temperature sensor 7 detects that the operating temperature of several battery bodies 3 connected in series in the battery pack body 1 is lower than 20°, and the heating and temperature raising device works. The heating mechanism inputs the heat medium stored in the heater body 15 into the heating pipe 4 to heat all the battery bodies 3, so that the temperature of all the battery bodies 3 increases. When the temperature reaches 20°, the new energy vehicle enters the start-up preparation state. Since the battery bodies 3 at the head and tail ends are subjected to a large voltage difference, by setting different first threshold and third threshold temperatures between the battery bodies 3 at the head and tail ends and other battery bodies 3, the battery bodies 3 at the head and tail ends subjected to a large voltage difference are cooled and dissipated in advance when they reach the first threshold temperature. Compared with the situation where the battery bodies 3 reach the third threshold temperature and then dissipate heat, the burden on the battery bodies 3 at the two ends is reduced, the battery bodies 3 at the two ends are prevented from being damaged, and the overall performance of the battery pack is kept stable.

[0058] In a further embodiment, 6-10 groups of battery bodies 3 are provided, and 1-2 groups of battery bodies 3 at the head and tail ends are provided respectively.

[0059] Through the above technical solution, the corresponding number of battery bodies 3 at the head and tail ends is set according to the number of battery bodies 3 in the battery pack body 1, which facilitates the subsequent cooling and heat dissipation operations of the battery bodies 3 at the head and tail ends that are subjected to larger voltage differences, thereby maintaining the overall performance of the battery pack stable.

[0060] In a further embodiment, a start preheating tube 22 is provided in the heat inlet pipe 19 , and the start preheating tube 22 is electrically connected to the auxiliary battery plate provided on the outside of the battery pack body 1 .

[0061] Through the above technical solution, the starting preheating tube 22 is energized by the auxiliary battery plate, so that the starting preheating tube 22 works and conducts heat, which is convenient for preheating the battery main body 3 when the new energy vehicle has not been driven for a long time and is in a low temperature environment to be started, and the ambient temperature of the battery main body 3 is increased to a balanced temperature, thereby avoiding the influence of the low ambient temperature on the service life of the battery main body 3.

[0062] In a further embodiment, a mounting sheet 6 is provided on the battery body 3 , and the temperature sensor 7 is provided on the mounting sheet 6 .

[0063] Through the above technical solution, the installation of the temperature sensor 7 is facilitated by the provision of the installation sheet 6 .

[0064] Working principle: When the temperature sensor 7 detects that the working temperature of the battery bodies 3 at the head and tail ends of the battery bodies 3 connected in series in the battery pack body 1 rises to more than the first threshold value, the cooling and heat dissipation device works, and the coolant in the cooling and heat dissipation tank 8 is input into the first liquid guide tank 9 through the first connecting pipe, and the coolant input into the first liquid guide tank 9 is input into the cooling pipe 5 through the liquid inlet pipe 12, so as to cool and dissipate the heat of the battery bodies 3 at the head and tail ends, so that the temperature of the battery bodies 3 drops to the second threshold value, and the reacted coolant in the cooling pipe 5 flows back to the second liquid guide tank 10 through the liquid outlet pipe 13, and then flows back to the cooling and heat dissipation tank 8 through the first connecting pipe; when the temperature sensor 7 detects that the temperature of other battery bodies 3 between the head and tail ends rises to more than the third threshold value, the cooling and heat dissipation device cools and dissipates the heat of other battery bodies 3, so that the temperature of other battery bodies 3 drops to the second threshold value; when the new energy vehicle has not been driven for a long time and is in a low temperature environment to be started, the temperature sensor 7 detects that the temperature of the battery bodies 3 at ... It is detected that the operating temperature of several battery bodies 3 connected in series in the battery pack body 1 is lower than the second threshold value, and the heating and heating device works. The heating and heating device works, and the heat medium in the heater body 15 is input into the first storage tank 16 through the second connecting pipe, and the heat medium input into the first storage tank 16 is input into the heating pipe 4 through the heat conduction inlet pipe 19, so that all battery bodies 3 are heated and heated, so that the temperature of all battery bodies 3 is increased. When the temperature reaches the second threshold value, the new energy vehicle enters the start-up preparation state, and the heat medium after the reaction in the heating pipe 4 flows back to the second storage tank 17 through the heat conduction outlet pipe 20, and then flows back to the heater body 15 through the second connecting pipe; the start preheating pipe 22 is energized by the auxiliary battery board, so that the start preheating pipe 22 works, which is convenient for preheating the battery body 3 when the new energy vehicle has not been driven for a long time and is in a low temperature environment to be started, and the ambient temperature of the battery body 3 is increased to a balanced temperature, so as to avoid the influence of the low ambient temperature on the service life of the battery body 3.

[0065] The preferred specific embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above specific embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical scheme of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. A device for adjusting the working consistency of a battery pack of a new energy vehicle, characterized in that: It comprises a battery pack main body (1) installed at the bottom of a new energy vehicle and a cooling and heat dissipation device; The battery pack body (1) is provided with a plurality of heat preservation grooves (2), the heat preservation grooves (2) are provided with battery bodies (3), a plurality of groups of the battery bodies (3) are connected in series, a cooling pipe (5) is wound around the battery bodies (3), a heating pipe (4) surrounding the battery bodies (3) is provided inside the heat preservation grooves (2), and a temperature sensor (7) is provided on each group of the battery bodies (3); The cooling and heat dissipation device comprises a cooling and heat dissipation tank (8), a liquid inlet mechanism and a liquid outlet mechanism, wherein the cooling and heat dissipation tank (8) is arranged outside the battery pack body (1), the liquid inlet mechanism is connected to the inlet of the cooling pipe (5) and inputs the cooling liquid in the cooling and heat dissipation tank (8) into the cooling pipe (5), and the liquid outlet mechanism is connected to the outlet of the cooling pipe (5) and returns the cooling liquid in the cooling pipe (5) to the cooling and heat dissipation tank (8); When the temperature sensor (7) detects that the operating temperature of the battery bodies (3) at the head and tail ends of the plurality of battery bodies (3) connected in series in the battery pack body (1) rises to a value exceeding a first threshold, the cooling and heat dissipation device operates, and the liquid inlet mechanism inputs the coolant in the cooling and heat dissipation tank (8) into the cooling pipes (5) corresponding to the battery bodies (3) at the head and tail ends to cool and dissipate the heat of the battery bodies (3), so that the temperature of the battery bodies (3) drops to a second threshold; When the temperature sensor (7) detects that the temperature of other battery bodies (3) between the battery bodies (3) at the head and tail ends rises above a third threshold, the cooling and heat dissipation device cools and dissipates the other battery bodies (3) so that the temperature of the other battery bodies (3) drops to a second threshold.

2. A device for adjusting the working consistency of a battery pack for a new energy vehicle according to claim 1, characterized in that: The liquid inlet mechanism comprises a first liquid guide tank (9) connected to the cooling and heat dissipation tank (8) via a first connecting pipe, and the first liquid guide tank (9) is provided with a plurality of liquid inlet pipes (12) connected to the inlets of the cooling pipes (5) in a one-to-one correspondence; The liquid outlet mechanism comprises a second liquid guide tank (10) connected to the cooling and heat dissipation tank (8) via a first connecting pipe, and the second liquid guide tank (10) is provided with a plurality of liquid outlet pipes (13) connected to outlets of the cooling pipe (5) in a one-to-one correspondence; The first connecting pipe is provided with a first liquid guiding valve (11), and the liquid inlet pipe (12) and the liquid outlet pipe (13) are both provided with a second liquid guiding valve (14).

3. A device for adjusting the working consistency of a battery pack for a new energy vehicle according to claim 1, characterized in that: The invention also comprises a heating and temperature-raising device installed at the bottom of the new energy vehicle, the heating and temperature-raising device comprising a heater body (15), a heat supply mechanism and a recovery mechanism, the heater body (15) being arranged outside the battery pack body (1), the heat supply mechanism being connected to the inlet of the heating pipe (4) and inputting the heat medium in the heater body (15) into the heating pipe (4), and the recovery mechanism being connected to the outlet of the heating pipe (4) and returning the heat medium in the heating pipe (4) to the heater body (15).

4. A new energy vehicle battery pack working consistency adjustment device according to claim 3, characterized in that: The heating mechanism comprises a first storage tank (16) connected to the heater body (15) via a second connecting pipe, and the first storage tank (16) is provided with a plurality of heat-conducting inlet pipes (19) connected one-to-one with the inlets of the heating pipe (4); The recovery mechanism comprises a second storage tank (17) connected to the heater body (15) via a second connecting pipe, and the second storage tank (17) is provided with a plurality of heat conduction outlet pipes (20) connected one-to-one with outlets of the heating pipe (4); The second connecting pipe is provided with a first heat conduction valve (18), and the heat conduction inlet pipe (19) and the heat conduction outlet pipe (20) are both provided with a second heat conduction valve (21).

5. The device for adjusting the working consistency of a battery pack of a new energy vehicle according to claim 3, characterized in that: When the new energy vehicle has not been driven for a long time and is in a low temperature environment and is waiting to be started, the temperature sensor (7) detects that the operating temperature of a plurality of battery bodies (3) connected in series in the battery pack body (1) is lower than a second threshold value, the heating and temperature raising device operates, and the heating mechanism inputs the heat medium stored in the heater body (15) into the heating pipe (4) to heat all the battery bodies (3), thereby increasing the temperature of all the battery bodies (3). When the temperature reaches the second threshold value, the new energy vehicle enters a start-up preparation state.

6. The device for adjusting the working consistency of a battery pack for a new energy vehicle according to claim 1, characterized in that: The first threshold is between the second threshold and the third threshold, the temperature difference between the first threshold and the second threshold is 10-15°, and the temperature difference between the third threshold and the first threshold is 10-12°.

7. A device for adjusting the working consistency of a battery pack for a new energy vehicle according to claim 6, characterized in that: The first threshold is 35°, the second threshold is 20°, and the third threshold is 45°.

8. The device for adjusting the working consistency of a battery pack for a new energy vehicle according to claim 1, characterized in that: The battery main bodies (3) are provided in 6 to 10 groups, and the battery main bodies (3) at the head and tail ends are provided in 1 to 2 groups respectively.

9. The device for adjusting the working consistency of a battery pack for a new energy vehicle according to claim 4, characterized in that: A starting preheating tube (22) is provided in the heat-conducting inlet tube (19), and the starting preheating tube (22) is electrically connected to a secondary battery plate provided outside the battery pack body (1).

10. The device for adjusting the working consistency of a battery pack of a new energy vehicle according to claim 1, characterized in that: The battery body (3) is provided with a mounting plate (6), and the temperature sensor (7) is arranged on the mounting plate (6).

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