Battery pack

Abstract

The utility model discloses a battery pack. The battery pack comprises a battery cell; the upper cover plate is positioned above the battery cell; the cooling plate is positioned below the battery cell and is used for cooling the battery pack; the lower protection plate is located below the cooling plate, and the lower protection plate is provided with a protruding part protruding in the direction away from the cooling plate; the side frame body is connected between the upper cover plate and the lower protection plate, so that a battery pack space is formed; a cooling plate is arranged in the battery pack space, the cooling plate divides the battery pack space into a battery cell space and a liquid storage space, the battery cells are located in the battery cell space, and a liquid drainage hole is further formed in the cooling plate and used for draining liquid in the battery cell space into the liquid storage space. According to the battery pack, internal safe liquid drainage can be realized, the danger of fire and explosion caused by short circuit of the battery pack is prevented, and meanwhile, the risk that foreign matters enter the battery pack due to outward liquid drainage can also be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pack. Background Art

[0002] Due to the breakage of the insulating layer of the battery cell, the electrolyte leaks out. Due to the large temperature difference between day and night or the large temperature difference between inside and outside the vehicle, the water vapor in the battery pack liquefies to form water. Due to the breakage of the cooling plate, the coolant in the cooling plate flows into the battery pack. All these reasons will cause liquid to accumulate in the battery pack, resulting in a short circuit in the battery pack and posing a risk of fire and explosion. In addition, due to the fitting design of the cooling plate and the lower guard plate, when the lower guard plate is impacted, the battery cell and the cooling plate will be damaged by external impact. Summary of the Utility Model

[0003] In view of this, an embodiment of the utility model provides a battery pack to solve the technical problems of liquid accumulation in the battery pack and damage to the battery cell and the cooling plate caused by external impact.

[0004] To achieve the above object, an embodiment of the utility model provides a battery pack, including:

[0005] A battery cell;

[0006] An upper cover plate, which is located above the battery cell;

[0007] A cooling plate, which is located below the battery cell and is used to cool the battery pack;

[0008] A lower guard plate, which is located below the cooling plate and has a convex portion protruding away from the cooling plate;

[0009] A side frame body, which is connected between the upper cover plate and the lower guard plate to form a battery pack space;

[0010] The cooling plate divides the battery pack space into a battery cell space and a liquid storage space. The battery cell is located in the battery cell space. The cooling plate is also provided with a liquid discharge hole, and the liquid discharge hole is used to drain the liquid in the battery cell space to the liquid storage space.

[0011] Optionally, a liquid discharge valve is further arranged in the liquid discharge hole, and the liquid discharge valve is used to control the opening or closing of the liquid discharge hole.

[0012] Optionally, the battery pack further includes a pressure sensor arranged on the cooling plate, and the pressure sensor is used to control the opening of the liquid discharge valve in response to detecting that the pressure value is greater than or equal to the pressure threshold.

[0013] Optionally, the battery pack further includes a liquid level sensor disposed on the inner wall of the side frame, and the liquid level sensor is configured to control the opening of the drain valve in response to detecting a liquid level signal.

[0014] Optionally, the drain hole is disposed at a position away from the battery cell, and the position where the drain hole is provided and the adjacent area thereof are lower than the main body of the cooling plate.

[0015] Optionally, the bottom of the convex portion is horizontal and parallel to the cooling plate.

[0016] Optionally, the battery pack further includes a buffer layer and / or a liquid absorption layer disposed in the liquid storage space.

[0017] Optionally, the buffer layer is foam or pearl cotton.

[0018] Optionally, the liquid absorption layer is sponge or liquid absorption cotton.

[0019] Optionally, the upper cover plate is sealingly connected to the top of the side frame through a first sealing ring, and the lower guard plate is sealingly connected to the bottom of the side frame through a second sealing ring.

[0020] In the embodiment of the present utility model, the lower guard plate is convexed away from the cooling plate to form a convex portion, thereby increasing a liquid storage space that can store liquid and absorb energy between the cooling plate and the lower guard plate. On the one hand, the liquid accumulated in the battery cell space can flow into the liquid storage space through the drain hole, realizing internal safe drainage, preventing the risk of fire and explosion caused by short circuit of the battery pack, and at the same time avoiding the risk of foreign objects entering the battery pack due to external drainage. On the other hand, since the liquid storage space is located between the cooling plate and the lower guard plate, when the lower guard plate is impacted, the cooling plate has sufficient buffer and energy absorption space, so that the cooling plate is not easily deformed, effectively avoiding damage to the battery cell and the cooling plate due to external impact, thereby improving the strength of the battery pack. Therefore, the liquid storage space not only functions as a liquid storage, but also functions as a buffer and energy absorption.

[0021] The further effects of the above non-conventional optional manners will be described in conjunction with specific embodiments hereinafter. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1It is a schematic structural diagram of a battery pack according to the first embodiment of the present utility model;

[0024] Figure 2 It is a schematic structural diagram of a battery pack according to the second embodiment of the present utility model;

[0025] Figure 3 It is a schematic structural diagram of a battery pack according to the third embodiment of the present utility model;

[0026] Figure 4 It is a schematic structural diagram of a battery pack according to the fourth embodiment of the present utility model;

[0027] Figure 5 It is a schematic structural diagram of a battery pack according to the fifth embodiment of the present utility model;

[0028] Figure 6 It is a schematic structural diagram of a battery pack according to the sixth embodiment of the present utility model;

[0029] Figure 7 It is a schematic structural diagram of a battery pack according to the seventh embodiment of the present utility model;

[0030] Figure 8 It is a schematic structural diagram of a battery pack according to the eighth embodiment of the present utility model;

[0031] Figure 9 It is a schematic structural diagram of a battery pack according to the ninth embodiment of the present utility model.

[0032] The reference signs are as follows:

[0033] 1 - Battery pack;

[0034] 10 - Battery cell;

[0035] 20 - Upper cover plate;

[0036] 21 - First sealing ring;

[0037] 30 - Cooling plate;

[0038] 31 - Drain hole;

[0039] 32 - Drain valve;

[0040] 33 - Pressure sensor;

[0041] 34 - Liquid level sensor;

[0042] 40 - Lower guard plate;

[0043] 41 - Protrusion

[0044] 42 - Second sealing ring;

[0045] 50 - Side frame;

[0046] 60 - battery cell space;

[0047] 70 - liquid storage space;

[0048] 80 - buffer layer;

[0049] 90 - liquid absorption layer. Specific embodiments

[0050] In order to enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0051] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0052] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality" means two or more, unless otherwise specifically defined.

[0053] The embodiments of the present utility model provide a battery pack, as Figure 1As shown in the figure, the battery pack 1 includes a battery cell 10, an upper cover plate 20, a cooling plate 30, a lower protection plate 40 and a side frame 50. Among them, the upper cover plate 20 is located above the battery cell 10, and the cooling plate 30 is located below the battery cell 10 for cooling the entire battery pack 1. The lower protection plate 40 is located below the cooling plate 30, and the lower protection plate 40 has a convex portion 41 protruding away from the cooling plate 30. The side frame 50 is connected between the upper cover plate 20 and the lower protection plate 40 to form a battery pack space. Since the cooling plate 30 is connected between the upper cover plate 20 and the lower protection plate 40, the cooling plate 30 can divide the battery pack space into a battery cell space 60 and a liquid storage space 70. The battery cell space 60 is formed above the cooling plate 30, and the liquid storage space 70 is formed below the cooling plate 30. Among them, the battery cell 10 is located in the battery cell space 60. Further, a liquid discharge hole 31 is also provided on the cooling plate 30, and the liquid discharge hole 31 is used to drain the liquid accumulated in the battery cell space 60 to the liquid storage space 70.

[0054] In the embodiment of the present utility model, the lower protection plate 40 protrudes away from the cooling plate 30 to form a convex portion 41, thereby increasing a liquid storage space 70 that can store liquid and absorb energy between the cooling plate 30 and the lower protection plate 40. On the one hand, the liquid accumulated in the battery cell space 60 can flow into the liquid storage space 70 through the liquid discharge hole 31, realizing internal safe liquid discharge, preventing the battery pack 1 from catching fire and exploding due to short circuit, and at the same time avoiding the risk of foreign objects entering the battery pack 1 caused by external liquid discharge. On the other hand, since the liquid storage space 70 is located between the cooling plate 30 and the lower protection plate 40, when the lower protection plate 40 is impacted, the cooling plate 30 has sufficient buffer and energy absorption space, so that the cooling plate 30 is not easily deformed, effectively avoiding the damage of the battery cell 10 and the cooling plate 30 caused by external impact, thereby improving the strength of the battery pack 1. Therefore, the liquid storage space 70 not only plays a role in storing liquid, but also plays a role in buffering and absorbing energy.

[0055] It should be noted that the cooling plate 30 and the side frame 50 can be made by an integral molding method, such as integrally molding with aluminum material; the cooling plate 30 and the side frame 50 can also be of a split type; among them, the side frame 50 can not only play a role in supporting the battery pack 1, but also play a role in cooling the battery pack 1. Moreover, the lower protection plate 40 can cover the entire lower surface of the cooling plate 30, or can only be provided on a part of the lower surface of the cooling plate 30. The embodiment of the present utility model does not limit this. Optionally, the lower protection plate 40 can be made of hard resin.

[0056] Optionally, the drain hole 31 is arranged at a position away from the battery cell 10, and the position where the drain hole 31 is arranged and the vicinity thereof are lower than the body of the cooling plate 30. Since a high-voltage distribution box (BDU) is also arranged in the battery cell space 60, and an insulating layer is arranged outside the battery cell 10, the drain hole 31 can be arranged at a position away from the battery cell 10, that is, close to the high-voltage distribution box, so that the accumulated liquid under the high-voltage distribution box can flow into the liquid storage space 70 through the drain hole 31 as soon as possible, preventing the accumulated liquid in the battery cell space 60 from being thrown upward during the driving of the vehicle and causing a short circuit in the battery pack 1. Moreover, the position where the drain hole 31 is arranged and the vicinity thereof are lower than the body of the cooling plate 30, which can further accelerate the flow of the accumulated liquid under the high-voltage distribution box into the liquid storage space 70 through the drain hole 31.

[0057] Optionally, the bottom of the protrusion 41 is horizontal and parallel to the cooling plate 30. This design can not only improve the liquid storage capacity of the liquid storage space 70, but also effectively protect the cooling plate 30 and the battery cell 10 from damage caused by external impact.

[0058] In some embodiments of the present invention, Figure 2 As shown, a drain valve 32 is further provided in the drain hole 31, and the drain valve 32 is used to control the drain hole 31 to be opened or closed. The drain valve 32 can be controlled to be opened or closed by a control unit. When the drain valve 32 is in an open state, the accumulated liquid in the battery cell space 60 flows into the liquid storage space 70 through the drain valve 32. When the accumulated liquid in the battery cell space 60 is completely drained, the drain hole 31 is controlled to be closed.

[0059] In some embodiments of the present invention, Figure 3 As shown, the battery pack 1 also includes a pressure sensor 33 disposed on the cooling plate 30. The pressure sensor 33 is used to control the drain valve 32 to open in response to detecting that the pressure value is greater than or equal to the pressure threshold. In order to accurately control the drain valve 32 to open or close, the pressure sensor 33 can be installed on the pressure sensor 33 on the cooling plate 30. When the pressure sensor 33 detects that the pressure value is greater than or equal to the pressure threshold, the drain valve 32 is controlled to open, so that the accumulated liquid in the battery cell space 60 flows into the liquid storage space 70 through the drain valve 32. Furthermore, when the pressure sensor 33 detects that the pressure value is less than the pressure threshold, the drain valve 32 is controlled to close to prevent the liquid in the liquid storage space 70 from flowing back to the battery cell space 60 again due to the shaking generated during the driving of the vehicle.

[0060] In some embodiments of the present invention, Figure 4As shown, the battery pack 1 further includes a liquid level sensor 34 disposed on the inner wall of the side frame 50. The liquid level sensor 34 is configured to control the opening of the drain valve 32 in response to detecting a liquid level signal. To accurately control the opening or closing of the drain valve 32, the liquid level sensor 34 can be installed on the inner wall of the side frame 50. When the liquid level sensor 34 detects a liquid level signal, it controls the drain valve 32 to open, so that the accumulated liquid in the cell space 60 flows into the liquid storage space 70 through the drain valve 32. Further, when the liquid level sensor 34 does not detect a liquid level signal, it controls the drain valve 32 to close, preventing the liquid in the liquid storage space 70 from flowing back into the cell space 60 again due to the shaking generated during vehicle driving.

[0061] Optionally, the battery pack 1 further includes a buffer layer 80 and / or an absorbent layer 90 disposed in the liquid storage space 70. In some embodiments of the present invention, as Figure 5 shown, a buffer layer 80 can be further disposed in the liquid storage space 70. Among them, the buffer layer 80 can be disposed in a partial space of the liquid storage space 70, such as at the lower position of the liquid storage space 70, such as at the middle position of the liquid storage space 70, or such as at the upper position of the liquid storage space 70. In some embodiments of the present invention, as Figure 6 shown, the buffer layer 80 can also be disposed throughout the liquid storage space 70. Disposing the buffer layer 80 in the liquid storage space 70 can further improve the buffer and energy absorption effect of the liquid storage space 70, making the cooling plate 30 not easily deformed, effectively avoiding damage to the battery cell 10 and the cooling plate 30 due to external impact, and thus further improving the strength of the battery pack 1.

[0062] In some embodiments of the present invention, as Figure 7 shown, an absorbent layer 90 can be further disposed in the liquid storage space 70. Among them, the absorbent layer 90 can be disposed in a partial space of the liquid storage space 70, such as at the lower position of the liquid storage space 70, such as at the middle position of the liquid storage space 70, or such as at the upper position of the liquid storage space 70. In some embodiments of the present invention, the absorbent layer 90 can also be disposed throughout the liquid storage space 70. Disposing the absorbent layer 90 in the liquid storage space 70 can further improve the liquid storage effect of the liquid storage space 70, enabling the liquid accumulated in the cell space 60 to flow into the liquid storage space 70 through the drain hole 31 as soon as possible, realizing internal safe drainage, preventing the battery pack 1 from catching fire and exploding due to short circuit, and also preventing the liquid in the liquid storage space 70 from flowing back into the cell space 60 again due to the shaking generated during vehicle driving.

[0063] In some embodiments of the present invention, as Figure 8As shown, a buffer layer 80 and a liquid absorption layer 90 are provided in the liquid storage space 70. The buffer layer 80 is close to the lower guard plate 40, and the liquid absorption layer 90 is close to the cooling plate 30. With this design, not only can the liquid storage effect of the liquid storage space 70 be improved, but also the buffer energy absorption effect of the liquid storage space 70 can be improved. Optionally, the buffer layer 80 is foam or pearl cotton, and other materials can also be used as the buffer layer 80. The embodiments of the present utility model do not limit this. Optionally, the liquid absorption layer 90 is sponge or liquid absorption cotton, and other materials can also be used as the liquid absorption layer 90. The embodiments of the present utility model do not limit this.

[0064] In some embodiments of the present utility model, as Figure 9 shown, the upper cover plate 20 and the top of the side frame body 50 are sealed and connected through a first sealing ring 21, and the lower guard plate 40 and the bottom of the side frame body are sealed and connected through a second sealing ring 42. In order to prevent the accumulated liquid in the battery cell space 60 from flowing out of the battery pack 1, and at the same time to avoid the risk of foreign objects entering the battery pack 1 due to outward liquid discharge, a first sealing ring 21 is further provided between the upper cover plate 20 and the top of the side frame body 50, so that the sealing performance of the battery cell space 60 is better. Similarly, in order to prevent the accumulated liquid in the liquid storage space 70 from flowing out of the battery pack 1, and at the same time to avoid the risk of foreign objects entering the battery pack 1 due to outward liquid discharge, a second sealing ring 42 is further provided between the lower guard plate 40 and the bottom of the side frame body, so that the sealing performance of the liquid storage space 70 is better.

[0065] The above specific embodiments do not constitute a limitation to the protection scope of the present utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can occur depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A battery pack, characterized in that: include: Battery cells; An upper cover plate, the upper cover plate being located above the battery cell; A cooling plate, located below the battery cell and used for cooling the battery pack; A lower guard plate, the lower guard plate is located below the cooling plate, and the lower guard plate has a protrusion protruding in a direction away from the cooling plate; A side frame body, wherein the side frame body is connected between the upper cover plate and the lower guard plate to form a battery pack space; The cooling plate divides the battery pack space into a cell space and a liquid storage space. The cell is located in the cell space. A drainage hole is also provided on the cooling plate, and the drainage hole is used to drain the liquid in the cell space to the liquid storage space.

2. The battery pack according to claim 1, characterized in that: The drainage hole is also provided with a drainage valve, and the drainage valve is used to control the opening or closing of the drainage hole.

3. The battery pack according to claim 2, characterized in that: The battery pack further includes a pressure sensor disposed on the cooling plate, and the pressure sensor is used to control the drain valve to open in response to detecting that a pressure value is greater than or equal to a pressure threshold.

4. The battery pack according to claim 2, characterized in that: The battery pack further comprises a liquid level sensor disposed on the inner wall of the side frame, wherein the liquid level sensor is used for controlling the opening of the drain valve in response to detecting a liquid level signal.

5. The battery pack according to claim 1, characterized in that: The drainage hole is arranged at a position far away from the battery core, and the position where the drainage hole is arranged and the vicinity thereof are lower than the body of the cooling plate.

6. The battery pack according to claim 1, characterized in that: The bottom of the protrusion is horizontal and parallel to the cooling plate.

7. The battery pack according to claim 1, characterized in that: The battery pack further includes a buffer layer and / or a liquid absorbing layer arranged in the liquid storage space.

8. The battery pack according to claim 7, characterized in that: The buffer layer is foam or pearl cotton.

9. The battery pack according to claim 7, characterized in that: The liquid absorbing layer is a sponge or liquid absorbing cotton.

10. The battery pack according to claim 1, characterized in that: The upper cover plate is sealed and connected to the top of the side frame body through a first sealing ring, and the lower guard plate is sealed and connected to the bottom of the side frame body through a second sealing ring.

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