Battery heat management structure and battery box

Abstract

The utility model relates to the technical field of lithium batteries, and provides a battery thermal management structure and a battery box, the battery thermal management structure comprises a base, a battery monomer and a TEC, the TEC is arranged on one surface of the battery monomer; and the heat conduction coefficient of one surface of the battery monomer provided with the TEC is 10-20 times of that of other surfaces. By controlling the heat conduction coefficient of the battery surface, the heat conduction rate can be effectively improved, so that the TEC can efficiently work, and meanwhile, the TEC is directly contacted with the battery monomers, so that the TEC is not influenced by the shell for battery grouping, the extremely high heat exchange rate can be ensured, and the service life of the battery pack is prolonged. Therefore, the temperature control requirement on heating or cooling of the battery is met, and the operation stability of the battery is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of lithium battery, especially to a battery heat management structure and battery box. BACKGROUND

[0002] At present, in the new energy field, the large-scale application of lithium battery is the trend, and the intelligentization of lithium battery heat management has become a hot spot. Current lithium battery heat management is mainly through plate exchange type liquid cooling plate, air cooling, etc. However, the plate exchange type liquid cooling plate needs to be transported through heat exchange and pipeline, which makes the heat management sensitivity low, and the air cooling heat exchange efficiency is low. Intelligent heat management needs high heat management sensitivity and high efficiency, so the plate exchange type liquid cooling plate and air cooling are not suitable for intelligent heat management.

[0003] The existing invention patent application with the application publication number CN110994071A discloses a pure electric vehicle battery heat management system, which comprises a thermoelectric chip, a storage battery, a current reversing intelligent switch, a battery thermocouple and a controller. The thermoelectric chip is attached to the automobile battery. The storage battery is electrically connected with the thermoelectric chip through the current reversing intelligent switch. The positive and negative electrodes of the storage battery are respectively connected with the two terminals of the control end of the current reversing intelligent switch. The P end of the thermoelectric chip is respectively connected with the A end and the B' end of the current reversing intelligent switch. The N end of the thermoelectric chip is respectively connected with the A' end and the B end of the current reversing intelligent switch. The storage battery is also connected with the battery thermocouple and the controller for power supply. The battery thermocouple is attached to the automobile battery. The controller is connected with the current reversing intelligent switch and controls the closing state thereof.

[0004] In the above technical solution, the thermoelectric chip is attached to the battery to realize the temperature management of the battery. However, for this structure, the battery shell significantly affects the heat conduction efficiency, thereby affecting the temperature regulation function. Moreover, due to the heat conduction of the shell itself, a lot of energy is wasted, and the power consumption is high, so the practicability is poor. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model provides a battery heat management structure and battery box with high temperature control efficiency and low energy consumption, thereby solving the problems of poor temperature control performance and high energy consumption of the existing battery temperature management structure.

[0006] The technical scheme of the utility model is as follows:

[0007] On the one hand, the utility model provides a battery heat management structure, which comprises a base, a battery monomer and a TEC, wherein,

[0008] The base is provided with the battery monomer;

[0009] The TEC is arranged on one side of the battery monomer;

[0010] The thermal conductivity coefficient of the one side of the battery cell where the TEC is arranged is 10-20 times of the thermal conductivity coefficient of other sides.

[0011] Preferably, the battery cell is a square battery, which comprises a large side, a side and a bottom;

[0012] The TEC is arranged on the large side and / or the side and / or the bottom.

[0013] Preferably, a through slot is arranged on the base.

[0014] The TEC is arranged on the bottom of the battery cell, and the TEC is arranged in the through slot.

[0015] Preferably, a plurality of battery cells are arranged side by side, and the large sides of the plurality of battery cells are opposite to each other.

[0016] The gasket is arranged between the two adjacent battery cells and abuts against the large side of the battery cell.

[0017] Preferably, the end plate and the binding belt are further included, wherein,

[0018] The two end plates are arranged opposite to each other and clamp the plurality of battery cells arranged side by side.

[0019] The binding belt binds the battery cells and the end plates.

[0020] Preferably, the TEC comprises a main body and a side plate, wherein,

[0021] The main body is attached to the side of the battery cell.

[0022] The side plate is arranged on one side of the main body.

[0023] The binding belt binds the side plate.

[0024] Preferably, a recess is arranged on the side of the end plate, and the binding belt is clamped in the recess.

[0025] In another aspect, the utility model provides a battery box, which comprises the above battery heat management structure.

[0026] Preferably, the BMS, the conversion switch and the direct current switch are further included, wherein,

[0027] The thermistor is integrated in the battery cell, and the battery cell and the thermistor are electrically connected with the BMS.

[0028] The conversion switch is electrically connected with the TEC.

[0029] The direct current switch, the BMS and the change-over switch are electrically connected.

[0030] On the basis of the above technical scheme, preferably, the environmental information detector and the air conditioner are further included, wherein,

[0031] The environmental information detector is used for detecting temperature, humidity, wind force and air density information.

[0032] The air conditioner is used for adjusting the environmental temperature and humidity.

[0033] The environmental information detector and the air conditioner are electrically connected with the BMS.

[0034] The battery thermal management structure and the battery box have the following beneficial effects relative to the prior art:

[0035] (1) By controlling the thermal conductivity coefficient of the battery surface, the thermal conduction rate can be effectively improved, so that the TEC can work efficiently, and since the TEC directly contacts the battery monomer, it is not affected by the battery group shell, and a very high heat exchange rate can be ensured, thereby meeting the temperature control requirements for heating or cooling the battery, and ensuring the stability of the battery operation.

[0036] (2) By setting the base and the through slot on the base, the through slot plays a role of avoiding after the TEC is integrated on the bottom surface of the battery monomer, and can be used for gas circulation to ensure the working efficiency of the TEC.

[0037] (3) The TEC is divided into a main body and a side plate, so that after the TEC is arranged on the side surface of the battery monomer, it can be fixed by the cable tie, which is beneficial to ensure the close contact of the TEC and the battery monomer, thereby ensuring the heat conduction efficiency.

[0038] (4) In the battery box structure, the change-over switch is arranged, which is used for controlling the heating and cooling of the TEC, so as to realize the heating and cooling switching of the same surface of the TEC, and improve the convenience of application; wherein the BMS is linked with the TEC, the air conditioner and other thermal management components, information is timely interchanged, and the BMS is uniformly controlled to centrally process information and issue instructions, which has the advantage of fast reaction speed.

[0039] (5) By setting the environmental information detector, the influence of the environment on the battery temperature can be analyzed, and the temperature of the battery can be collected by the thermistor, so that the battery temperature can be more accurately, sensitively and efficiently regulated; the air conditioner is further arranged in the battery box, so that the TEC and the air conditioner are used together, and the thermal management capability is strengthened. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0041] Figure 1 It is a perspective view of the battery thermal management structure of the present application.

[0042] Figure 2 It is a battery monomer and TEC connection structure diagram of the battery thermal management structure of the present application.

[0043] Figure 3 It is a system diagram of the battery thermal management structure of the present application.

[0044] In the figure: 1, base; 101, through slot; 2, battery monomer; 201, large surface; 202, side surface; 203, bottom surface; 3, TEC; 31, main body; 32, side plate; 4, gasket; 5, end plate; 501, groove; 6, tie; 7, BMS; 8, change-over switch; 9, DC switch; 10, environmental information detector; 11, air conditioner. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0046] As shown in the drawings, Figures 1-3 The battery thermal management structure of the present application comprises a base 1, a battery monomer 2, a TEC 3, a gasket 4, an end plate 5 and a tie 6.

[0047] The battery box of the present application comprises the above-mentioned battery thermal management structure, and further comprises a BMS 7, a change-over switch 8, a DC switch 9, an environmental information detector 10 and an air conditioner 11.

[0048] Among them, the TEC 3 is a thermoelectric cooling device, and the BMS 7 is a battery management system.

[0049] As shown in the drawings, Figure 1 and Figure 2 The base 1 is provided with the battery monomer 2; the TEC 3 is arranged on one side of the battery monomer 2; the heat conduction coefficient of the side of the battery monomer 2 provided with the TEC 3 is 10-20 times of the heat conduction coefficient of the other sides.

[0050] As the above structure, the base 1 is used to carry the battery monomer 2, and the TEC 3 is attached to the battery monomer 2, so that when the TEC 3 cools or heats, heat conduction is directly conducted between the TEC 3 and the battery monomer 2, without contacting the shell for the battery group, thereby effectively improving the heat exchange efficiency and reducing the energy consumption.

[0051] At the same time, by controlling the thermal conductivity coefficient of the shell surface of the battery monomer 2, the shell surface of the TEC 3 is 10-20 times of the thermal conductivity coefficient of the other surface, so that the heat exchange efficiency can be further improved.

[0052] As shown in Figure 1 and Figure 2 , the battery monomer 2 is a square battery, which includes a large surface 201, a side surface 202 and a bottom surface 203; the TEC 3 is arranged on the large surface 201 and / or the side surface 202 and / or the bottom surface 203;

[0053] As the above structure, the battery monomer 2 is arranged as a square battery, which has two large surfaces 201, two side surfaces 202, one bottom surface 203 and one top surface for integrating the pole;

[0054] When the TEC 3 is arranged, the TEC 3 is attached to the side surface 202 or the bottom surface 203, so that the interference with the battery monomer 2 for grouping and the interference with the integration of the pole can be avoided.

[0055] As shown in Figure 1 , a through slot 101 is formed in the base 1; the TEC 3 is arranged on the bottom surface of the battery monomer 2, and the TEC 3 is located in the through slot 101;

[0056] As the above structure, when the TEC 3 is integrated on the bottom surface of the battery monomer 2, the through slot 101 is arranged on the base 1, so as to accommodate the TEC 3, and at the same time, the gas flow can be ensured, so as to ensure the working efficiency of the TEC.

[0057] As shown in Figure 1 , a plurality of battery monomers 2 are arranged side by side, and the large surfaces of the plurality of battery monomers 2 are opposite to each other; the gasket 4 is arranged between the adjacent two battery monomers 2 and abuts against the large surface of the battery monomer 2;

[0058] As the above structure, when the battery is integrated, the large surfaces 201 of the plurality of battery monomers 2 are opposite to each other, so that a plurality of battery monomers 2 are arranged side by side; when the battery is integrated, the gasket 4 is arranged between the adjacent battery monomers 2, so as to buffer the battery monomers 2 and avoid the extrusion damage between the battery monomers 2.

[0059] As shown in Figure 1As shown, the end plate 5 is provided with two, two end plates 5 clamping and parallelly arranged multiple battery monomers 2; the cable tie 6 bundles the battery monomers 2 and the end plate 5;

[0060] As shown above, when the battery monomers 2 are integrated, the two end plates 2 clamp the multiple battery monomers 2, and the cable tie 6 is used for bundling and fixing, so as to form the battery module.

[0061] As Figure 2 As shown, the TEC 3 includes a main body 31 and a side plate 32, wherein the main body 31 is attached to the side surface 202 of the battery monomer 2; the side plate 32 is arranged on one side of the main body 31; and the cable tie 6 bundles the side plate 32.

[0062] As shown above, when the TEC 3 is integrated on the side surface 202 of the battery monomer 2, the TEC 3 is composed of the main body 31 and the side plate 32, so that the main body 31 is used for refrigeration and heating, and the side plate 32 can be bundled by the cable tie 6, so as to ensure the tightness of the TEC 3 attached to the battery monomer 2, promote the heat conduction efficiency, and reduce the energy loss.

[0063] As Figure 1 As shown, the side surface of the end plate 5 is provided with a groove 501, and the cable tie 6 is clamped in the groove 501.

[0064] As shown above, when the end plate 5 is arranged, the groove 501 is arranged on the end plate 5, so that the cable tie 6 can be limited when assembled, and the cable tie 6 is prevented from sliding away from the battery monomer 2 and the TEC 3.

[0065] As Figure 3 As shown, in the battery box of the present application, the environmental information detector 10 is used for detecting temperature, humidity, wind force and air density information; the air conditioner 11 is used for adjusting the environmental temperature and humidity; the environmental information detector 10 and the air conditioner 11 are electrically connected with the BMS 7;

[0066] As shown above, after the environmental information detector 10 detects the temperature, humidity, wind force and air density information, the relevant data is transmitted to the BMS 7, which is centrally processed, and then the air conditioner 11 is controlled to operate; when the TEC 3 releases heat, the air conditioner 11 is refrigerated, and when the TEC 3 heats the battery monomer 2, the air conditioner 11 is heated, so as to ensure that the temperature inside the battery box is in a suitable state;

[0067] By arranging the environmental information detector 10, the influence of the environment on the battery temperature can be analyzed, and the temperature of the battery can be collected by the thermistor, so that the battery temperature can be controlled more accurately, sensitively and efficiently; the air conditioner 11 in the battery box, so that the TEC and the air conditioner are used together, and the heat management capability is strengthened.

[0068] The environmental information detector 10 adopts various sensors.

[0069] As Figure 3 shown, a thermistor is integrated in the battery cell 2, and the battery cell 2 and the thermistor are electrically connected with the BMS 7; the conversion switch 8 is electrically connected with the TEC 3; the direct current switch 9, the BMS 7 and the conversion switch 8 are electrically connected;

[0070] As the above structure, the thermistor in the battery cell 2 is used for monitoring the temperature of the battery cell 2, and the temperature information is transmitted to the BMS 7, so that the BMS 7 can control the TEC 3 to work according to the temperature information;

[0071] The conversion switch 8 and the direct current switch 9 are used for current transmission control of the TEC 3;

[0072] The TEC 3 contains "P-type" and "N-type" semiconductor materials, when two different conductors form a loop, if a direct current is given to the loop, one node in the loop releases heat, and the other node cools; if the current direction is reversed, the heat flow direction is also reversed, combined with the thermistor and the control of the current direction, the TEC can both cool and heat, and the temperature control stability is better than 0.1℃;

[0073] By changing the positive and negative poles of the input direct current of the TEC 3, the heating and cooling of one side of the TEC 3 is realized.

[0074] The BMS 7 links with the TEC 3, the air conditioner 11 and other thermal management components, information is timely communicated, and is controlled by the BMS 7, information is centrally processed and instructions are issued, and the reaction speed is fast.

[0075] Specific implementation steps are as follows:

[0076] The temperature information of the battery cell 2 is detected by the thermistor, the environmental information is detected by the environmental information detector 10, and the information is transmitted to the BMS 7, the BMS 7 determines to heat or cool the battery cell 2 according to the collected information, the BMS 7 turns on the direct current switch 9 to supply power to the TEC 3, and the TEC 3 can heat or cool;

[0077] According to the information, the BMS 7 issues a switching instruction, the conversion switch 8 changes the positive and negative poles of the direct current, and the TEC 3 can switch between cooling and heating, so as to realize the thermal management of the battery cell 2;

[0078] The air conditioner 11 is used for auxiliary regulation and control of the temperature in the battery box.

[0079] The above only describes the preferred embodiments of the present application, and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery thermal management structure, characterized by: It comprises a base (1), a battery cell (2) and a TEC (3), wherein, The base (1) is provided with the battery cell (2); The TEC (3) is arranged on one side of the battery cell (2); The thermal conductivity of the side of the battery cell (2) provided with the TEC (3) is 10-20 times of that of other sides.

2. The battery thermal management structure of claim 1, wherein: The battery cell (2) is a square battery comprising a large side (201), a side (202) and a bottom (203); The TEC (3) is arranged on the large side (201) and / or the side (202) and / or the bottom (203).

3. The battery thermal management structure of claim 2, wherein: The base (1) is provided with a through slot (101); The TEC (3) is arranged on the bottom of the battery cell (2), and the TEC (3) is located in the through slot (101).

4. The battery thermal management structure of claim 2, wherein: It further comprises a gasket (4), a plurality of battery cells (2) are arranged side by side, and the large sides of the plurality of battery cells (2) are opposite to each other; The gasket (4) is arranged between two adjacent battery cells (2) and abuts against the large side of the battery cell (2).

5. The battery thermal management structure of claim 4, wherein: It further comprises an end plate (5) and a cable tie (6), wherein, The two end plates (5) clamp the plurality of battery cells (2) arranged side by side; The cable tie (6) binds the battery cells (2) and the end plates (5).

6. The battery thermal management structure of claim 5, wherein: The TEC (3) comprises a main body (31) and a side plate (32), wherein, The main body (31) is attached to the side (202) of the battery cell (2); The side plate (32) is arranged on one side of the main body (31); The cable tie (6) binds the side plate (32).

7. The battery thermal management structure of claim 6, wherein: The side of the end plate (5) is provided with a groove (501), and the cable tie (6) is engaged in the groove (501).

8. A battery pack, characterized by: It comprises the battery thermal management structure according to any one of claims 1-7.

9. The battery pack of claim 8, wherein: It further comprises a BMS (7), a conversion switch (8) and a direct current switch (9), wherein, The battery cell (2) is integrated with a thermistor, and the battery cell (2) and the thermistor are electrically connected to the BMS (7); The conversion switch (8) is electrically connected to the TEC (3); The direct current switch (9), the BMS (7) and the conversion switch (8) are electrically connected.

10. The battery pack of claim 9, wherein: It further comprises an environmental information detector (10) and an air conditioner (11), wherein, The environmental information detector (10) is used to detect temperature, humidity, wind power and air density information; The air conditioner (11) is used to adjust the temperature and humidity of the environment; The environmental information detector (10) and the air conditioner (11) are electrically connected to the BMS (7).

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