Battery module

Abstract

The utility model provides a battery module, which belongs to the technical field of energy storage equipment, and comprises a box body, a battery module and a battery module, the fixing part is connected with the box body to seal the opening of the accommodating cavity; a temperature sensor is arranged on the heating part; the connection heat conduction part is used for transferring heat generated on the heating part to the battery cell, and the heating part is connected with the fixing part and the connection heat conduction part; the battery has the advantages that the temperature sensor is located on the heating part and can monitor the temperature of the battery cell by being connected with the heat conduction part, the temperature obtaining efficiency is higher, the temperature collection is more accurate, and the dry burning phenomenon caused by over-temperature of the heating part can be prevented; the fixing part and the box body are fixed to form the closed containing cavity used for containing the battery cell, and when the heating part and the connecting heat conduction part are located in the containing cavity, the heating part and the connecting heat conduction part are extruded after the fixing part and the box body are fixed, so that the heating part is stabilized in the box body, and dry burning caused by the fact that the heating part falls off from the battery cell is avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to energy storage equipment technical field especially relates to a battery module. BACKGROUND

[0002] In electric automobile, the battery energy storage module provides electric energy, and the electric motor converts the electric energy into the kinetic energy of the automobile. Therefore, in the field of electric vehicles, the battery energy storage module is a key technology. In the prior art, the battery energy storage module of the electric vehicle is usually realized by a battery pack, and the battery pack contains a plurality of battery modules, and each battery module is provided with a plurality of batteries. The batteries in the battery module are usually ternary lithium ion batteries or iron lithium phosphate batteries. Such batteries may have dendrites due to excessively low temperature, such as minus 20 degrees Celsius, at which time the internal circuit of the battery is short-circuited when charging, and even catches fire or explodes. That is, there is a safety problem in charging at low temperature. In order to overcome this challenge, the existing technical solution usually preheats the battery module before starting charging to raise the battery temperature to a more suitable range. The preheating process can be realized by attaching a heating film on the surface of the battery cell. However, this method also has certain safety hazards. For example, if the adhesion between the heating film and the battery cell is not firm enough, it may fall off during use. Once the heating film is separated from the surface of the battery cell, continued work may cause dry burning phenomenon, thereby causing temperature out of control and increasing the risk of fire. SUMMARY

[0003] The utility model aims at the above problems existing in the prior art and provides a battery module capable of monitoring the heating temperature of the battery cell in real time.

[0004] The utility model can be realized by the following technical scheme: a battery module, comprising:

[0005] A box body is provided with a receiving cavity having an opening at one end;

[0006] A fixing part is connected with the box body to close the opening of the receiving cavity;

[0007] A heating part is provided with a temperature sensor;

[0008] A connecting heat conduction part is used to transfer the heat generated on the heating part to the battery cell, and the heating part is connected with the fixing part and the connecting heat conduction part respectively.

[0009] In the battery module, the heating part is provided with a mounting groove with an opening at one end, the temperature sensor is located in the mounting groove, and the opening of the mounting groove is arranged towards the direction of the connecting heat conduction part to realize the abutting connection of the temperature sensor and the connecting heat conduction part.

[0010] In the battery module, the heating part is provided with a connecting cavity, and the connecting heat conduction part passes through the connecting cavity and is fixed to the fixing part.

[0011] In the battery module, the heating part includes a first heating film and a second heating film fixedly arranged, a heating part is arranged between the first heating film and the second heating film, and the first heating film and the second heating film are both provided with hollow holes, and the hollow holes of the first heating film and the second heating film are correspondingly arranged to form a connecting cavity.

[0012] In the battery module, the second heating film is provided with a mounting through hole and a mounting groove formed between the first heating film, the temperature sensor is abuttingly connected to the first heating film, and the end of the temperature sensor passes through the mounting through hole and is abuttingly connected to the connecting heat conduction part.

[0013] In the battery module, the temperature sensor includes a temperature measuring probe and a connecting wire electrically connected to the temperature measuring probe, a first end of the temperature measuring probe is abuttingly connected to the first heating film, a second end of the temperature measuring probe passes through the mounting through hole and is abuttingly connected to the connecting heat conduction part, and the connecting wire is electrically connected to the control module.

[0014] In the battery module, the heating part includes a heating resistance wire located between the first heating film and the second heating film.

[0015] In the battery module, the connecting heat conduction part includes a connecting heat conduction adhesive layer abuttingly connected to the heating part.

[0016] In the battery module, the temperature sensor is located at the center position of the heating part.

[0017] In the battery module, the fixing part includes a uniform temperature plate connected to the box body.

[0018] Compared with the prior art, the battery module has the beneficial effects that:

[0019] (1) The temperature sensor is located on the heating part, the temperature of the battery cell can be monitored through the connected heat conduction part, the temperature acquisition efficiency is higher, the collected temperature is more accurate, and the dry burning phenomenon caused by overheating of the heating part can be prevented; and the fixed part is fixed with the box body to form a closed containing cavity for placing the battery cell, and when the heating part and the connected heat conduction part are located in the containing cavity, the fixed part is fixed with the box body, and the heating part and the connected heat conduction part are also extruded, so that the heating part is stably arranged in the box body, and dry burning caused by falling of the heating part from the battery cell is avoided.

[0020] (2) The heating part is stably kept in the double connection mode of clamping and fixing of the fixed part and direct fixing of the fixed part.

[0021] (3) The hollow holes on the first heating film and the hollow holes on the second heating film are correspondingly arranged to form a through connecting cavity, so that when the fixed part is fixed with the box body, the connected heat conduction part can pass through the connecting cavity and be fixed with the fixed part; and when the heating film is pasted, the "trapped air" problem that air is trapped between the film and the base material may occur, which can cause the generation of air bubbles, reduce the heat conduction efficiency of the heating film and cause uneven temperature distribution, so that the hollow holes are arranged to drive the air trapped between the heating films away from the hollow holes when the heating film is pasted.

[0022] (4) The uniform temperature plate not only can serve as the cover plate of the box body, but also can realize uniform transmission and diffusion of heat generated by the heating part; the high-efficiency heat conduction performance of the uniform temperature plate helps to improve the thermal management effect of the whole battery module, and ensures that the battery cell works in a safe and efficient temperature range. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is an exploded structural schematic view of the utility model embodiment;

[0024] Figure 2 is a plane structural schematic view of the heating part in the utility model;

[0025] Figure 3 is an exploded structural schematic view of Figure 2 ;

[0026] Figure 4 is a partial sectional schematic view of the utility model embodiment.

[0027] In the figure, the box body 100; the containing cavity 101; the battery cell 102; the fixed part 200; the heating part 300; the temperature sensor 301; the mounting groove 302; the connecting cavity 303; the hollow hole 304; the first heating film 305; the second heating film 306; the mounting through hole 307; the temperature measuring probe 308; the connecting wire 309; the heating resistance wire 310; the connected heat conduction part 400. DETAILED DESCRIPTION

[0028] The technical solutions of the utility model will be further described in combination with the specific embodiments of the utility model and the drawings, but the utility model is not limited to these embodiments.

[0029] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications will also change accordingly.

[0030] As shown in Figures 1-4 A battery module, comprising:

[0031] A box body 100, the box body 100 is provided with a containing cavity 101 with an opening at one end;

[0032] A fixed part 200, the fixed part 200 is connected with the box body 100, realizing the closure of the opening of the containing cavity 101;

[0033] A heating part 300, the heating part 300 is provided with a temperature sensor 301;

[0034] A connecting heat conduction part 400, the connecting heat conduction part 400 is used to transfer the heat generated on the heating part 300 to the battery cell 102, and the heating part 300 is connected with the fixed part 200 and the connecting heat conduction part 400 respectively.

[0035] In this embodiment, the temperature sensor 301 is located on the heating part 300, which can monitor the temperature of the battery cell 102 through the connecting heat conduction part 400, has higher temperature acquisition efficiency, and can acquire temperature more accurately, so as to prevent the dry burning phenomenon caused by the too high temperature of the heating part 300; and the fixed part 200 is fixed with the box body 100 to form a closed containing cavity 101 for placing the battery cell 102, which helps to maintain the temperature stability of the battery cell 102 during the heating process and reduce the influence of the external environment; and when the heating part 300 and the connecting heat conduction part 400 are located in the containing cavity 101, the fixed part 200 and the box body 100 are fixed to further extrude the heating part 300 and the connecting heat conduction part 400, so that the heating part 300 is stably located in the box body 100, and the heating part 300 will not fall off from the battery cell 102 to cause dry burning even if it encounters bumps or vibrations.

[0036] As shown in Figure 1 As an optional solution, the heating part 300 is connected with the fixed part 200 and the connecting heat conduction part 400 respectively.

[0037] It is worth mentioning that the fixed part 200 is connected with the box body 100, realizes the closure of the opening of the containing cavity 101, ensures the sealing of the module, and the design of the fixed part 200 needs to ensure that the connection with the box body 100 is tight to prevent external environment (such as dust, moisture) from causing damage to the battery cell 102, so in the present application, the fixed part 200 can be fixed between the box body 100 by ultrasonic welding.

[0038] As shown in Figure 2 As preferred, the heating part 300 is provided with a mounting groove 302 with an opening at one end, the temperature sensor 301 is located in the mounting groove 302, and the opening of the mounting groove 302 is arranged towards the direction of connecting the heat conduction part 400, realizing the abutting connection of the temperature sensor 301 and the connecting heat conduction part 400.

[0039] In the embodiment, the heating part 300 is used to heat the battery cell 102 to make it warm, ensuring that the battery can be safely and effectively charged and discharged under low temperature conditions, and in order to make the information collection of the temperature sensor 301 more accurate, a mounting groove 302 with an opening at one end is arranged on the heating part 300 for accommodating the temperature sensor 301, and the opening direction of the mounting groove 302 is towards the connecting heat conduction part 400, so that the temperature sensor 301 can be directly connected with the connecting heat conduction part 400, reducing the possible loss in the process of heat transfer from the battery cell to the temperature sensor 301, and ensuring the accuracy of the temperature data.

[0040] As shown in Figure 1 In the present application, the fixed part 200, the heating part 300, the connecting heat conduction part 400 and the box body 100 are arranged in sequence from top to bottom, the battery cell 102 is arranged in the box body 100, the box body 100 is fixed with the fixed part 200 to form a closed cavity, the heating part 300 and the connecting heat conduction part 400 are located in the closed cavity, the temperature sensor 301 is located in the mounting groove 301 with an opening at one end on the center position of the heating part 300, and the opening of the mounting groove 301 is arranged towards the connecting heat conduction part 400 and abuts with the connecting heat conduction part 400.

[0041] As preferred, the heating part 300 is provided with a connecting through cavity 303, and the connecting heat conduction part 400 passes through the connecting through cavity 303 and is fixed with the fixed part 200.

[0042] In the embodiment, the fixing portion 200 is fixed with the box body 100, and cooperates with the connecting heat conduction portion 400 to clamp and fix the heating portion 300, so that the mounting stability of the heating portion 300 is increased; and the mounting stability of the heating portion 300 is further ensured, and the connecting through cavity 303 is arranged on the heating portion 300, and the connecting heat conduction portion 400 passes through the connecting through cavity 303 and is fixed with the fixing portion 200; that is, in the application, the heating portion 300 is kept stable in the double connecting mode of the extrusion and fixing action of the fixing portion 200 and the clamping and fixing action of the fixing portion 200 and the connecting heat conduction portion 400.

[0043] As shown in Figure 3 Specifically, the heating portion 300 includes the first heating film 305 and the second heating film 306 which are fixedly arranged, the heating portion 300 is provided with the temperature rising portion between the first heating film 305 and the second heating film 306, and the first heating film 305 and the second heating film 306 are provided with the hollow hole 304, and the hollow hole 304 on the first heating film 305 and the hollow hole 304 on the second heating film 306 are correspondingly arranged to form the connecting through cavity 303.

[0044] It is worth mentioning that the first heating film 305 is further provided with the back adhesive which is adhesively fixed with the fixing portion 200.

[0045] It is worth mentioning that the first heating film 305 and the second heating film 306 are made of PI film, have the properties of high temperature resistance, electrical insulation, lightness, thinness, softness and the like, and the hollow hole 304 is in the form of a long strip, a plurality of hollow holes 304 are arranged in parallel, and the length direction of the hollow hole 304 is perpendicular to the length direction of the heating portion 300, so that the long strip-shaped hollow hole 304 can provide sufficient gas discharge space while ensuring the structural strength; the design of the hollow hole 304 not only realizes the direct connection between the fixing portion 200 and the connecting heat conduction portion 400, but also increases the contact area with the connecting heat conduction portion 400, so that the heat conduction efficiency is improved.

[0046] In the embodiment, the heating part 300 comprises the first heating film 305 and the second heating film 306 connected with each other, the temperature rising part is filled between the two heating films, the temperature is transferred by the heating films, the hollow holes 304 are arranged on the two heating films, the hollow holes 304 on the first heating film 305 are arranged in correspondence with the hollow holes 304 on the second heating film 306 when the two heating films are spliced with each other, the through connection cavity 303 is formed, then when the fixing part 200 is fixed with the box body 100, the connection heat conducting part 400 can pass through the connection cavity 303 and be fixed with the fixing part 200; and when the heating film is used for pasting, the "trapped air" problem that the air is trapped between the film and the base material can be encountered, which can cause the generation of air bubbles, reduce the heat conduction efficiency of the heating film and cause uneven temperature distribution, so that the air trapped between the heating films can be driven away from the hollow holes 304 when the heating film is pasted.

[0047] Specifically, the mounting through hole 307 is arranged on the second heating film 306 to form the mounting groove 302 with the first heating film 305, the temperature sensor 301 is abutted and connected to the first heating film 305, and the end of the temperature sensor 301 passes through the mounting through hole 307 and is abutted and connected to the connection heat conducting part 400.

[0048] Further preferably, the temperature sensor 301 comprises the temperature measuring probe 308 and the connection wire 309 electrically connected to the temperature measuring probe 308, the first end of the temperature measuring probe 308 is abutted with the first heating film 305, the second end of the temperature measuring probe 308 passes through the mounting through hole 307 and is abutted with the connection heat conducting part 400, and the connection wire 309 is electrically connected to the control module.

[0049] In the embodiment, the mounting through hole 307 is arranged on the second heating film 306, the first heating film 305 is an integral mold, the temperature sensor 301 comprises the temperature measuring probe 308 and the connection wire 309 electrically connected to the temperature measuring probe 308, the first end of the temperature measuring probe 308 is abutted with the first heating film 305, the second end of the temperature measuring probe 308 passes through the mounting through hole 307 and is abutted with the connection heat conducting part 400, the connection wire 309 passes through the first heating film 305 and the second heating film 306 and is electrically connected to the temperature measuring probe 308, the connection wire 309 is electrically connected to the control module, the real-time temperature information monitored by the temperature sensor 301 is transmitted to the control module, and the control module adjusts the heating temperature of the heating part 300 according to the received information.

[0050] Specifically, the temperature rising part comprises the heating resistance wire 310 between the first heating film 305 and the second heating film 306, the heating resistance wire 310 needs to avoid the position of the hollow hole 304 during installation, and then the heating resistance wire 310 is uniformly distributed in the entire heating film to ensure better heating efficiency and more uniform heat transfer.

[0051] It is worth mentioning that the heating resistance wire 310 is the main component of the heating part 300, which realizes the heating function by using the heat generated by the resistance when the current passes through. The positive and negative ends of the heating resistance wire 310 are introduced from the outside of the heating part 300, which is convenient for connecting the power supply. The first heating film 305 and the second heating film 306 made of PI film material play an insulating protection role, and can also help to uniformly distribute heat, improve heating efficiency and safety. The heating resistance wire 310 is located between the two films, which ensures that the heat can be effectively transferred to the surrounding environment, and also prevents safety hazards caused by direct contact.

[0052] Specifically, the heating resistance wire 310 is symmetrically arranged along the length axis direction of the heating part 300. Such a design helps to ensure the uniformity of heating. The symmetrical arrangement can reduce the risk of local overheating and make the temperature of the entire heating surface more uniform. In order to maximize the use of limited space and ensure that the heating area is as large as possible, the heating resistance wire 310 is arranged in a meandering and bending manner. This way can provide a longer heating path in a smaller space, thereby achieving better heating effect.

[0053] Further preferably, the connecting heat-conducting part 400 includes a connecting heat-conducting glue layer in contact with the heating part 300. The connecting heat-conducting glue layer filled in the battery module can realize heat transfer and transfer the heat generated on the heating part 300 to the battery cell 102. When the fixing part 200 is fixed to the box body 100, the connecting heat-conducting glue layer flows into the connecting cavity 303 under the extrusion of the fixing part 200 to realize the adhesion and fixation with the fixing part 200. The connecting heat-conducting glue layer can also fix the battery cell 102 inside the module to prevent displacement under vibration or impact, improve the overall stability of the module, and help to evenly disperse the heat generated by the battery when the battery heat is high, thereby improving the heat dissipation effect and prolonging the battery life.

[0054] Further preferably, the temperature sensor 301 is located at the center position of the heating part 300.

[0055] As shown in Figure 2 In the present embodiment, the number of temperature sensors 301 is one, which is arranged at the center position of the heating part 300. The monitoring of the center position can represent the overall temperature. The temperature at the center position usually reflects the average temperature of the entire battery module, especially when the temperature distribution inside the module is relatively uniform. The edge part of the battery module is usually more affected by the external environment, such as wind cooling or the action of a heat sink. Placing the sensor at the center position can reduce the interference of these edge effects and obtain more stable temperature readings.

[0056] Further preferably, the fixing part 200 comprises a uniform temperature plate connected with the box body 100.

[0057] In the embodiment, the fixing part 200 comprises a uniform temperature plate connected with the box body 100, which not only serves as a cover plate of the box body 100, but also realizes uniform transmission and diffusion of heat generated by the heating part 300; the high-efficiency heat conduction performance of the uniform temperature plate helps to improve the thermal management effect of the whole battery module, and ensures that the battery cell 102 works in a safe and efficient temperature range; the uniform temperature plate is usually made of a material with high thermal conductivity, such as copper or aluminum, to ensure good heat conduction performance.

[0058] It should be noted that the description of "first", "second", "one" and the like in the present application is only for the purpose of description and cannot be understood as indicating or implying the relative importance of the technical features or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited. The terms "connection", "fixing" and the like should be interpreted broadly, for example, "fixing" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium; can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0059] In addition, the technical solutions of each embodiment of the present application can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present application.

[0060] The specific embodiments described herein are merely illustrative of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A battery module, characterized by, The utility model relates to a battery heating device, including: A box body is internally provided with a containing cavity with an opening at one end; A fixing part is connected with the box body to realize the closure of the opening of the containing cavity; A heating part is provided with a temperature sensor; A connecting heat conduction part is used to transfer the heat generated on the heating part to the battery, and the heating part is connected with the fixing part and the connecting heat conduction part respectively.

2. The battery module of claim 1, wherein, The heating part is provided with a mounting groove with an opening at one end, and the temperature sensor is located in the mounting groove, and the opening of the mounting groove is arranged towards the direction of the connecting heat conduction part to realize the abutting connection of the temperature sensor and the connecting heat conduction part.

3. The battery module of claim 1 or 2, wherein The heating part is provided with a connecting cavity, and the connecting heat conduction part passes through the connecting cavity and is fixed with the fixing part.

4. The battery module of claim 3, wherein, The heating part includes a first heating film and a second heating film fixedly arranged, a temperature rising part is arranged between the first heating film and the second heating film, and the first heating film and the second heating film are both provided with hollow holes, and the hollow holes on the first heating film and the second heating film are correspondingly arranged to form a connecting cavity.

5. The battery module of claim 4, wherein, The second heating film is provided with a mounting through hole and a mounting groove is formed between the first heating film, the temperature sensor is abuttingly connected to the first heating film, and the end of the temperature sensor passes through the mounting through hole and is abuttingly connected with the connecting heat conduction part.

6. The battery module of claim 5, wherein, The temperature sensor includes a temperature measuring probe and a connecting wire electrically connected with the temperature measuring probe, the first end of the temperature measuring probe is abutting with the first heating film, the second end of the temperature measuring probe passes through the mounting through hole and is abutting with the connecting heat conduction part, and the connecting wire is electrically connected with a control module.

7. The battery module of claim 4, wherein, The temperature rising part includes a heating resistance wire located between the first heating film and the second heating film.

8. The battery module of claim 1, wherein, The connecting heat conduction part includes a connecting heat conduction glue layer abuttingly connected with the heating part.

9. The battery module of claim 1, wherein, The temperature sensor is located at the center position of the heating part.

10. The battery module of claim 1, wherein, The fixing part includes a uniform temperature plate connected with the box body.

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