Battery module and battery pack

Abstract

The utility model relates to a battery module and a battery pack. The battery module comprises a battery body, a heat exchange layer and a heat conduction layer, the battery body comprises a shell and a battery cell packaged in the shell. The heat exchange layer is arranged on the shell and is in heat conduction with the shell, and the heat exchange layer comprises a heat exchange pipeline for a cooling medium to circulate. The heat conduction layer is arranged on one side, back on to the battery body, of the heat exchange layer and is in heat conduction with the heat exchange layer. According to the scheme, the risk of thermal runaway of the battery module can be reduced.

Description

Technical Field

[0001] This application relates to the technical field of battery heat dissipation, and more particularly, to a battery module and a battery pack. Background Art

[0002] Currently, the capacity density of automotive lithium batteries on the market is 160 Wh / kg - 300 Wh / kg, which consists of an anode electrode, a cathode electrode, an electrolyte, a separator, a polymer casing, etc. The material elements of lithium batteries are easily affected by temperature. When the battery is in abnormal situations such as high temperature overcharging, the lithium ions in the electrolyte become extremely active, leading to thermal runaway of the lithium battery. Summary of the Invention

[0003] This application provides a battery module and a battery pack with good heat dissipation effect and low risk of thermal runaway.

[0004] A battery module includes:

[0005] A battery body, including a casing and a battery cell encapsulated within the casing;

[0006] A heat exchange layer disposed on the casing, in thermal conduction with the casing. The heat exchange layer includes a heat exchange pipeline for the circulation of a cooling medium;

[0007] A heat conduction layer disposed on the side of the heat exchange layer facing away from the battery body, in thermal conduction with the heat exchange layer.

[0008] Optionally, the heat exchange layer further includes a first film layer and a second film layer. The heat exchange pipeline is fixed between the first film layer and the second film layer and is in thermal conduction with the first film layer and the second film layer.

[0009] Optionally, the first film layer is set as a metal film layer made of a metal material or an insulating and heat-conducting film layer made of an insulating and heat-conducting material; and / or

[0010] The second film layer is set as a metal film layer made of a metal material or an insulating and heat-conducting film layer made of an insulating and heat-conducting material.

[0011] Optionally, the heat conduction layer is set as a flexible and insulating heat conduction layer.

[0012] Optionally, the battery module further includes a protective layer disposed on the side of the heat conduction layer facing away from the heat exchange layer.

[0013] Optionally, the protective layer is set as a metal protective layer made of a metal material.

[0014] Optionally, the outer casing is provided in a cuboid structure, including a first surface and a second surface opposite to each other in the thickness direction, and the heat exchange layer is provided on the first surface and / or the second surface.

[0015] Optionally, the battery module further includes a protective layer. The heat exchange layer, the heat conduction layer, and the protective layer are sequentially arranged outward from the first surface, and the heat exchange layer, the heat conduction layer, and the protective layer are sequentially arranged outward from the second surface. The area of the protective layer provided on the second surface is larger than the area provided on the second surface.

[0016] A battery pack includes:

[0017] A battery pack housing;

[0018] The battery module as described in any one of the above, and a plurality of the battery modules are assembled in the battery pack housing.

[0019] Optionally, the plurality of battery modules are regularly arranged, and a deformable isolation material is provided between any two adjacent battery modules.

[0020] This application provides a battery module and a battery pack. Among them, the outer casing of the battery module is provided with a heat exchange layer and is in thermal conduction with the outer casing. The heat conduction layer is provided on the side of the heat exchange layer facing away from the battery body and is in thermal conduction with the heat exchange layer. With such an arrangement, the battery body can exchange heat with the heat exchange layer, so that the heat generated by the battery body can be transferred out by the cooling medium of the heat exchange layer, which is beneficial to reducing the temperature rise of the battery body. In addition, the heat conduction layer can further transfer the waste heat of the heat exchange layer to improve the heat dissipation effect. Description of the Drawings

[0021] Figure 1 is an exploded view of a battery module shown in an exemplary embodiment of the present application;

[0022] Figure 2 is Figure 1 a schematic diagram of the heat exchange layer shown in;

[0023] Figure 3 is a schematic diagram of a partial structure of a battery pack shown in an exemplary embodiment of the present application. Detailed Embodiments

[0024] Here, the technical solutions in the embodiments (or "embodiment modes") of the present application will be clearly and completely described in conjunction with the drawings. When the following description involves the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0025] If there are terms related to directional indication or positional relationship in the embodiments of the present application (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial direction, radial direction, circumferential direction, etc.), such terms are only used to explain the relative positional relationship and motion conditions between components in a specific posture (as shown in the drawings); if the specific posture changes, the directional indication or positional relationship will also change accordingly. In addition, the terms "first", "second", etc. involved in the embodiments of the present application are only for the purpose of convenient description and cannot be construed as indicating or implying relative importance.

[0026] Please refer to Figure 1 and Figure 2 , Figure 1 is an exploded view of a battery module 100 shown in an exemplary embodiment of the present application. Figure 2 is Figure 1 a schematic diagram of the heat exchange layer 20 shown in

[0027] The present application provides a battery module 100, which includes a battery body 10, a heat exchange layer 20, and a heat conduction layer 30. The battery body 10 includes a housing 11 and battery cells 12 encapsulated in the housing 11. The internal structure of the battery cells 12 is not limited. In one embodiment, the battery cells 12 may include a positive electrode material, an insulating material, a semi-solid fluid electrolyte, and a negative electrode material.

[0028] The heat exchange layer 20 is provided on the housing 11 and is in thermal conduction with the housing 11. The heat exchange layer 20 includes a heat exchange pipeline 21 for the circulation of a cooling medium. Through the circulation of the cooling medium flowing in and out of the heat exchange pipeline 21, heat exchange with the battery body 10 can be achieved. For example, the flow rate of the cooling medium can also be controlled according to the change in the temperature of the battery body 10, thereby improving the heat exchange efficiency. The heat conduction layer 30 is provided on the side of the heat exchange layer 20 facing away from the battery body 10 and is in thermal conduction with the heat exchange layer 20.

[0029] According to the above description, it can be known that the battery body 10 can perform heat exchange with the heat exchange layer 20 provided on the housing 11, so that the heat generated by the battery body 10 can be transferred out, which is beneficial to reducing the temperature rise of the battery body 10. In addition, the heat conduction layer 30 can further transfer the residual heat of the heat exchange layer 20 out, improving the heat dissipation effect.

[0030] In one embodiment, as Figure 2As shown, the heat exchange layer 20 further includes a first film layer 22 and a second film layer (not shown). The heat exchange pipeline 21 is fixed between the first film layer 22 and the second film layer and is in thermal conduction with the first film layer 22 and the second film layer. The heat exchange pipeline 21 can be adhesively fixed to the first film layer 22 and the second film layer. With such an arrangement, the heat exchange pipeline 21 can be clamped and fixed by the first film layer 22 and the second film layer, ensuring the stability of the position of the heat exchange pipeline 21. Moreover, the heat exchange pipeline 21, the first film layer 22, and the second film layer can remain relatively fixed to form a modular structure, facilitating subsequent assembly together.

[0031] In an alternative embodiment, the first film layer 22 includes, but is not limited to, a metal film layer made of a metal material and an insulating and heat-conducting film layer made of an insulating and heat-conducting material. The metal film layer and the insulating and heat-conducting film layer have good heat-conducting performance and good heat-conducting effect. The second film layer includes, but is not limited to, a metal film layer made of a metal material and an insulating and heat-conducting film layer made of an insulating and heat-conducting material. In some other embodiments, the first film layer 22 and the second film layer can also adopt a flexible heat-conducting film layer made of silica gel and a heat-conducting material.

[0032] In one embodiment, the heat-conducting layer 30 is provided as a flexible and insulating heat-conducting layer. The flexible material has good adhesion and can ensure effective heat conduction with the heat exchange layer 20. The heat-conducting layer 30 includes, but is not limited to, aluminum oxide heat-conducting rubber, boron nitride heat-conducting rubber, and heat-conducting silica gel.

[0033] Please refer again to Figure 1 , in one embodiment, the battery module 100 further includes a protective layer 40, and the protective layer 40 is provided on the side of the heat-conducting layer 30 facing away from the heat exchange layer 20. The protective layer 40 adheres to the outside of the heat-conducting layer 30 and can protect the heat-conducting layer 30, the heat exchange layer 20, and the battery body 10.

[0034] In an alternative embodiment, the protective layer 40 is provided as a metal film layer made of a metal material and having a relatively high strength. The protective layer 40 includes, but is not limited to, a chromium alloy layer. Of course, the material of the protective layer 40 is not limited to this.

[0035] In Figure 1In the illustrated embodiment, the housing 11 is provided in a cuboid structure, including a first surface 111 and a second surface 112 that are opposite to each other in the thickness direction. The heat exchange layer 20 is provided on the first surface 111 and / or the second surface 112. As can be seen from the shape of the housing 11, the area of the first surface 111 and / or the second surface 112 is larger than that of other surfaces. Therefore, the heat exchange area is large and the heat exchange effect is better. The heat exchange layer 20 can be fixed to the first surface 111 and / or the second surface 112 by means of bonding. It should be noted that the heat exchange layer 20 may not be provided on other surfaces of the housing 11 to reduce space occupation and improve the energy density of the battery.

[0036] In Figure 1 In the illustrated embodiment, a heat exchange layer 20, a heat conduction layer 30, and a protective layer 40 are sequentially provided outward from the first surface 111, and a heat exchange layer 20, a heat conduction layer 30, and a protective layer 40 are sequentially provided outward from the second surface 112. Among them, the area of the protective layer 40 provided on the second surface 112 is larger than that of the protective layer 40 on the second surface 112. In this way, uniform heat dissipation on both opposite sides of the battery body 10 is achieved. In addition, the area of the protective layer 40 provided on the second surface 112 is larger than the area of the second surface 112, which can provide better protection for the second surface 112. It should be noted that when the battery module 100 is assembled in the battery pack housing, the protective layer 40 provided on the second surface 112 can be used as the installation bottom surface.

[0037] Please refer to Figure 3 , Figure 3 which is a schematic diagram of a partial structure of the battery pack 200 shown in an exemplary embodiment of the present application.

[0038] The present application also provides a battery pack 200, which includes a battery pack housing 201 and the above-mentioned battery module 100. A plurality of the battery modules 100 are provided and assembled in the battery pack housing 201.

[0039] In one embodiment, an installation position for placing the battery module 100 can be provided in the battery pack housing 201, including but not limited to a groove, so as to leave a gap between the battery modules 100. The plurality of battery modules 100 can be regularly arranged, which can save space and improve the battery energy density, but is not limited thereto.

[0040] In one embodiment, in order to avoid hard collisions between the battery modules 100, a flexible isolation material is provided between any two adjacent battery modules 100. The flexible isolation material is used to separate the battery modules 100 and can also relieve and absorb the impact when the battery modules 100 collide.

[0041] The battery pack housing 201 may include a lower case and an upper cover that are separately provided. The lower case and the upper cover may be fixedly connected by bolts, but are not limited thereto. After the lower case and the upper cover are assembled, a plurality of battery compartments may be formed. Each battery module 100 is correspondingly arranged in each battery compartment, and each battery compartment may be sealed from each other to prevent one battery module 100 from causing thermal runaway and affecting other battery modules 100.

[0042] In Figure 3 the illustrated embodiment, the number of battery modules 100 is 20, the voltage of each battery module 100 is 24V, 20 battery modules 100 are connected in series, the total voltage of the battery pack 200 is 480V, and the capacity is 60 - 100 kWh.

[0043] The foregoing is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery module, characterized in that, Comprising: A battery body, including a housing and a battery cell encapsulated within the housing; A heat exchange layer disposed on the housing and in thermal communication with the housing, the heat exchange layer including a heat exchange pipeline for the circulation of a cooling medium; A heat conducting layer disposed on a side of the heat exchange layer facing away from the battery body, the heat conducting layer being in thermal communication with the heat exchange layer.

2. The battery module according to claim 1, wherein, The heat exchange layer further includes a first film layer and a second film layer, the heat exchange pipeline being fixed between the first film layer and the second film layer and in thermal communication with the first film layer and the second film layer.

3. The battery module according to claim 2, wherein The first film layer is provided as a metal film layer made of a metal material or an insulating heat conducting film layer made of an insulating heat conducting material; and / or The second film layer is provided as a metal film layer made of a metal material or an insulating heat conducting film layer made of an insulating heat conducting material.

4. The battery module according to claim 1, characterized in that The heat conducting layer is provided as a flexible and insulating heat conducting layer.

5. The battery module according to any one of claims 1 to 4, characterized in that The battery module further includes a protective layer disposed on a side of the heat conducting layer facing away from the heat exchange layer.

6. The battery module according to claim 5, characterized in that, The protective layer is provided as a metal protective layer made of a metal material.

7. The battery module according to any one of claims 1 to 4, characterized in that The housing is provided in a cuboid structure, including a first surface and a second surface opposite to each other in the thickness direction, the heat exchange layer being provided on the first surface and / or the second surface.

8. The battery module according to claim 7, wherein The battery module further includes a protective layer. The heat exchange layer, the heat conducting layer, and the protective layer are sequentially provided outward from the first surface, and the heat exchange layer, the heat conducting layer, and the protective layer are sequentially provided outward from the second surface. The area of the protective layer disposed on the second surface is greater than the area of the second surface.

9. A battery pack, characterized in that, Comprising: A battery pack housing; The battery module according to any one of claims 1 to 8, wherein a plurality of the battery modules are assembled within the battery pack housing.

10. The battery pack according to claim 9, characterized in that, The plurality of battery modules are regularly arranged, and a deformable isolation material is provided between any two adjacent battery modules.

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