Battery module heat dissipation structure

Abstract

The utility model discloses a battery module radiating structure which comprises a plurality of battery cells and a low-voltage acquisition device, the upper ends of the battery cells are provided with positive electrodes and negative electrodes, every two battery cells are connected in series and in parallel through pole pieces to form a high-voltage total positive electrode and a high-voltage total negative electrode, the acquisition end of the low-voltage acquisition device is electrically connected with the pole pieces, and the acquisition end of the low-voltage acquisition device is electrically connected with the pole pieces. An insulating heat dissipation plate is arranged on the upper end face of the battery cell, the insulating heat dissipation plate is located between the positive electrode of the battery cell and the negative electrode of the battery cell, and the low-voltage acquisition device is attached to the insulating heat dissipation plate; the battery has the advantages that heat generated in the upper end area of the battery cell can be quickly conducted out, the service life of the battery cell is prolonged, and the safety of the battery cell is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery modules, and in particular relates to a heat dissipation structure of a battery module. Background Art

[0002] Battery modules have been widely used in mobile phones, power tools, medical electronics, new energy vehicles, energy storage base stations and other fields due to their excellent performance. Since battery modules generate heat during operation, especially during high current charging and discharging, the heat generation is more obvious. If this heat is not conducted out in time and accumulates inside the battery cell, it will cause the side reactions inside the battery cell to intensify, and in severe cases, it will lead to thermal runaway.

[0003] Conventional battery modules are as shown in the attached "A battery module and battery pack" disclosed in the authorization announcement number CN216958413U. Figure 1 As shown, it includes a plurality of battery cells, and the battery cells are connected in series and parallel through pole pieces to form a high-voltage total positive electrode and a high-voltage total negative electrode, wherein the high-voltage total positive electrode and the high-voltage total negative electrode are used to be electrically connected to the high-voltage conductor, and the collection end of the low-voltage collection device is electrically connected to the pole piece, and is used to collect the voltage, temperature and other parameters of the battery cell. In order to conduct away the heat generated during the charging and discharging process of the battery cell, a liquid cooling plate is generally set on the side of the battery cell or the lower end of the battery cell (see the liquid cooling plate and battery pack disclosed in CN220439711U). Since the metal material used in the liquid cooling plate usually has a low insulation capacity, it is set on the side of the battery cell or the lower end of the battery cell to be away from the positive and negative electrodes of the battery cell, so as to avoid the electrical safety problem between the high and low voltages of the battery module caused by the liquid cooling plate. However, the positive and negative electrodes of the battery cell are the parts with the highest current density in the battery cell structure, and the heat generated during the charging and discharging process is also the highest, resulting in a large amount of heat generated in the upper end area of ​​the battery cell. Conventional liquid cooling plates cannot directly and quickly conduct the heat generated in the upper end area of ​​the battery cell, which is not conducive to extending the service life of the battery cell, and it is also difficult to ensure the safety of the battery cell. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a battery module heat dissipation structure, which can quickly conduct away the heat generated in the upper end area of ​​the battery cell, help to extend the service life of the battery cell, and ensure the safety of the battery cell.

[0005] The technical solution adopted by the utility model to solve the above technical problems is: a battery module heat dissipation structure, including multiple battery cells and a low-voltage collection device, the upper ends of the battery cells are provided with positive electrodes and negative electrodes, the battery cells are connected in series and parallel through pole pieces to form a high-voltage total positive electrode and a high-voltage total negative electrode, the collection end of the low-voltage collection device is electrically connected to the pole pieces, an insulating heat dissipation plate is provided on the upper end surface of the battery cell, the insulating heat dissipation plate is located between the positive electrode of the battery cell and the negative electrode of the battery cell, and the low-voltage collection device is attached to the insulating heat dissipation plate.

[0006] Preferably, the insulating heat sink comprises a heat sink and an insulating layer covering the surface of the heat sink.

[0007] Preferably, the heat sink is an aluminum plate or a copper plate.

[0008] Preferably, the insulating heat dissipation plate is made of polyamide material, and metal particles are mixed into the insulating heat dissipation plate.

[0009] Preferably, the low-voltage collection device comprises an integrated wiring harness, a collector and a protective layer, two ends of the collector are electrically connected to the integrated wiring harness and the electrode respectively, and the protective layer is coated on the surface of the integrated wiring harness.

[0010] Preferably, the integrated wiring harness is attached to the insulating heat dissipation plate, and the surface of the integrated wiring harness not in contact with the insulating heat dissipation plate is covered with the protective layer.

[0011] Preferably, the high-voltage total positive electrode and the high-voltage total negative electrode are respectively connected to high-voltage conductors, and extension plates are provided on both sides of the insulating heat dissipation plate, and the extension plates are pressed onto the upper end surfaces of the high-voltage conductors.

[0012] Preferably, the low-voltage collection device is attached to the upper end surface of the insulating heat sink.

[0013] Preferably, the extension plate is pressed onto the upper end surface of the pole piece, and the low-voltage collection device is attached to the lower end surface of the extension plate.

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

[0015] 1. By setting an insulating heat sink at the upper end of the battery cell, the heat generated in the upper area of ​​the battery cell can be conducted out through the insulating heat sink, which is direct and fast, with good heat dissipation effect, which helps to extend the service life of the battery cell and ensure the safety of the battery cell;

[0016] 2. During use, the insulating heat sink can also play a certain role in cooling the positive and negative electrodes of the battery cell, which helps to reduce the loss caused by the current passing through the positive and negative electrodes of the battery cell and improve the energy saving effect;

[0017] 3. The insulating heat sink has a certain insulation property, which can avoid electrical safety problems between high and low voltages and has better safety.

[0018] 4. The insulating heat dissipation plate is arranged at the upper end of the plurality of battery cells and is located between the positive electrode of the battery cell and the negative electrode of the battery cell, so that the space utilization rate is relatively sufficient and the integration is relatively good. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1It is a schematic diagram of the structure of the utility model;

[0020] Figure 2 The cross-sectional structure of the utility model is shown in FIG. Figure 1 ;

[0021] Figure 3 It is a schematic diagram of the explosion structure of the medium and low pressure collection device of the utility model;

[0022] Figure 4 The cross-sectional structure of the utility model is shown in FIG. Figure 2 ;

[0023] Figure 5 The cross-sectional structure of the utility model is shown in FIG. Figure 3 .

[0024] In the figure: 1. battery cell; 11. positive electrode; 12. negative electrode; 2. pole piece; 3. low voltage collection device; 31. integrated wiring harness; 32. collector; 33. protective layer; 4. high voltage conductor; 5. insulating heat sink; 51. heat sink; 52. insulating layer; 53. extension plate. DETAILED DESCRIPTION

[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0026] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0027] Embodiment 1: Figure 1 and Figure 2 As shown, a battery module heat dissipation structure includes multiple battery cells 1 and a low-voltage collection device 3. A positive electrode 11 and a negative electrode 12 are arranged at the upper end of the battery cell 1. The battery cells 1 are connected in series and parallel through pole pieces 2 to form a high-voltage total positive electrode and a high-voltage total negative electrode. The collection end of the low-voltage collection device 3 is electrically connected to the pole piece 2. An insulating heat dissipation plate 5 is arranged on the upper end surface of the battery cell 1. The insulating heat dissipation plate 5 is located between the positive electrode 11 of the battery cell 1 and the negative electrode 12 of the battery cell 1. The low-voltage collection device 3 is attached to the insulating heat dissipation plate 5.

[0028] In this embodiment, the insulating heat sink 5 includes a heat sink 51 and an insulating layer 52 covering the surface of the heat sink 51 .

[0029] In this embodiment, the low-voltage collection device 3 includes an integrated wiring harness 31, a collector 32 and a protective layer 33. The two ends of the collector 32 are electrically connected to the integrated wiring harness 31 and the electrode 2 respectively. The protective layer 33 is coated on the surface of the integrated wiring harness 31. Conventionally, the protective layer 33 also has a certain insulation. In this structure, the insulating heat sink 5 and the low-voltage collection device 3 are designed in a hierarchical structure, and the two can be installed independently.

[0030] In this embodiment, the positive and negative electrodes of the battery cell 1 may be poles or tabs.

[0031] Embodiment 2: Figure 2 and Figure 3 As shown, the rest of the parts are the same as those in the first embodiment, except that the heat sink 51 is an aluminum plate or a copper plate, which has good thermal conductivity; the insulating layer adopts epoxy paint or polyurethane paint, which has good pressure resistance, insulation and weather resistance.

[0032] Embodiment 3: The rest of the parts are the same as Embodiment 1, except that the insulating heat sink 5 is made of polyamide material, and metal particles are mixed in the insulating heat sink 5. The polyamide material has good pressure resistance, insulation and weather resistance. By adding metal particles such as aluminum and copper into the polyamide material, the overall thermal conductivity can be improved. Of course, other high-performance materials with pressure resistance, insulation, weather resistance, etc. can also be used for physical barriers.

[0033] Embodiment 4: The rest of the embodiment is the same as that of embodiment 1, except that the integrated wiring harness 31 is attached to the insulating heat dissipation plate 5 , and the surface of the integrated wiring harness 31 that is not in contact with the insulating heat dissipation plate 5 is covered with a protective layer 33 .

[0034] In this structure, the insulating heat sink 5 and the low-voltage collection device 3 are designed with a composite structure, and the heat sink 51 and the integrated wiring harness 31 share an insulating layer 52, which improves the integration.

[0035] Embodiment 5: Figure 4 As shown, the rest of the parts are the same as those in the first embodiment, except that the high-voltage total positive electrode and the high-voltage total negative electrode are respectively connected to the high-voltage conductor 4, and the two sides of the insulating heat dissipation plate 5 are provided with extension plates 53, and the extension plates 53 are pressed onto the upper end surface of the high-voltage conductor 4. Conventionally, the high-voltage total positive electrode and the high-voltage total negative electrode are respectively welded and fixed to the high-voltage conductor 4.

[0036] Since the current density and heat generation in the high-voltage total positive electrode area and the high-voltage total negative electrode area are high, the insulating heat dissipation plate 5 is extended to the high-voltage conductor 4 to simultaneously conduct the heat in this area to achieve a good heat dissipation effect, which helps to further extend the service life of the battery cell 1 and ensure the safety of the battery cell 1.

[0037] In this embodiment, the low-voltage collection device 3 is attached to the upper end surface of the insulating heat dissipation plate 5 .

[0038] In this embodiment, the extension plate 53 and the heat dissipation plate 51 are integrally formed, and the cross-sections of the two are T-shaped. The insulation layer 52 covers the surfaces of the heat dissipation plate 51 and the extension plate 53 .

[0039] Example 6: Figure 5 As shown, the rest of the parts are the same as those in the fifth embodiment, except that the extension plate 53 is pressed onto the upper end surface of the pole piece 2, the low-voltage collection device 3 is attached to the lower end surface of the extension plate 53, and the insulating heat dissipation plate 5 can simultaneously conduct the heat on the pole piece 2 to achieve a good heat dissipation effect.

[0040] The above is an exemplary description of the utility model in conjunction with the accompanying drawings. It is obvious that the implementation of the utility model is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the utility model, or the concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A battery module heat dissipation structure, comprising a plurality of battery cells (1) and a low-voltage collection device (3), wherein the upper end of the battery cell (1) is provided with a positive electrode (11) and a negative electrode (12), and the battery cells (1) are connected in series and parallel via pole pieces (2) to form a high-voltage total positive electrode and a high-voltage total negative electrode, and the collection end of the low-voltage collection device (3) is electrically connected to the pole piece (2), characterized in that An insulating heat dissipation plate (5) is provided on the upper end surface of the battery cell (1); the insulating heat dissipation plate (5) is located between the positive electrode (11) of the battery cell (1) and the negative electrode (12) of the battery cell (1); and the low-voltage collection device (3) is attached to the insulating heat dissipation plate (5).

2. A battery module heat dissipation structure according to claim 1, characterized in that The insulating heat dissipation plate (5) comprises a heat dissipation plate (51) and an insulating layer (52) covering the surface of the heat dissipation plate (51).

3. A battery module heat dissipation structure according to claim 2, characterized in that The heat dissipation plate (51) is an aluminum plate or a copper plate.

4. A battery module heat dissipation structure according to claim 1, characterized in that The insulating heat dissipation plate (5) is made of a polyamide material, and metal particles are mixed into the insulating heat dissipation plate (5).

5. A battery module heat dissipation structure according to claim 1, characterized in that The low-voltage collection device (3) comprises an integrated wiring harness (31), a collector (32) and a protective layer (33); two ends of the collector (32) are electrically connected to the integrated wiring harness (31) and the electrode (2) respectively; and the protective layer (33) covers the surface of the integrated wiring harness (31).

6. A battery module heat dissipation structure according to claim 5, characterized in that The integrated wiring harness (31) is attached to the insulating heat dissipation plate (5), and the surface of the integrated wiring harness (31) not in contact with the insulating heat dissipation plate (5) is covered with the protective layer (33).

7. A battery module heat dissipation structure according to claim 1, characterized in that The high-voltage total positive electrode and the high-voltage total negative electrode are respectively connected to a high-voltage conductor (4), and extension plates (53) are provided on both sides of the insulating heat dissipation plate (5), and the extension plates (53) are pressed onto the upper end surface of the high-voltage conductor (4).

8. A battery module heat dissipation structure according to claim 1 or 7, characterized in that The low-voltage collection device (3) is attached to the upper end surface of the insulating heat dissipation plate (5).

9. A battery module heat dissipation structure according to claim 7, characterized in that The extension plate (53) is pressed onto the upper end surface of the pole piece (2), and the low-voltage collection device (3) is attached to the lower end surface of the extension plate (53).

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