Battery pack

Abstract

The battery pack comprises a box body, a liquid cooling plate and a battery cell module, the liquid cooling plate is arranged in the box body, one side of the liquid cooling plate is used for placing the battery cell module, the other side of the liquid cooling plate and the bottom wall of the box body are arranged at an interval, a cavity is defined between the other side of the liquid cooling plate and the inner wall of the box body, and the cavity is provided with an inlet and an outlet; the inlet and the outlet are formed in the two opposite side walls of the box body respectively. According to the battery pack provided by the invention, the temperature of the liquid cooling plate can be quickly reduced, so that the heat dissipation effect of the liquid cooling plate on the battery cell module is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack. Background Art

[0002] The battery pack in new energy vehicles provides the driving force for the vehicle to move forward. The battery pack usually includes a box, a battery module and a cold plate. The cold plate is fixed in the box, and the battery module is glued to the cold plate. The battery module is cooled by filling the cold plate with coolant. However, some battery packs with high charging power will generate a lot of heat when charging, so it is necessary to strengthen the heat dissipation of the battery module. Relying solely on the cold plate cannot meet the heat dissipation requirements of the battery module. Utility Model Content

[0003] Based on this, it is necessary to provide a battery pack that can improve the heat dissipation effect of the battery module.

[0004] A battery pack includes a box, a liquid cooling plate and a battery cell module. The liquid cooling plate is installed inside the box, and one side of the liquid cooling plate is used to place the battery cell module, and the other side is spaced from the bottom wall of the box and enclosed with the inner wall of the box to form a cavity. The cavity has an inlet and an outlet, and the inlet and the outlet are respectively opened on two opposite side walls of the box.

[0005] In one of the embodiments, the battery pack further includes two baffles, one of which is installed at the inlet and is used to open or close the inlet, and the other baffle is installed at the outlet and is used to open or close the outlet.

[0006] In one of the embodiments, the opening size of the inlet and / or the outlet is configured to be adjustable.

[0007] In one embodiment, the baffle is slidably connected to the outer wall of the box, and by sliding the baffle along the outer wall of the box, the area blocked by the baffle at the inlet and / or outlet can be increased or decreased; or, the baffle is hingedly connected to the outer wall of the box, and by flipping the baffle relative to the outer wall of the box, the area blocked by the baffle at the inlet and / or outlet can be increased or decreased.

[0008] In one embodiment, a plurality of partitions are disposed in the cavity, the plurality of partitions are arranged at intervals, and the cavity is divided into a plurality of air ducts, and the air ducts are connected with the inlet and the outlet.

[0009] In one embodiment, one end of the partition is connected to the bottom wall of the box body, and the other end has a support surface, and the support surface is against the liquid cooling plate.

[0010] In one embodiment, the liquid cooling plate includes a top plate and a bottom plate connected to each other, the bottom plate is arranged close to the cavity, and the bottom plate has a recessed portion recessed toward the direction close to the cavity, the recessed portion and the top plate are spaced and surrounded to form a flow channel, and the flow channel is used for the circulation of cooling liquid; the supporting surface abuts against the recessed portion.

[0011] In one embodiment, the partition has a channel, which is arranged parallel to the air duct and connects the inlet and the outlet.

[0012] In one embodiment, the inlet and / or the outlet comprises a plurality of through holes, and the plurality of through holes are spaced apart on the side wall of the box.

[0013] In one embodiment, the distance between the liquid cooling plate and the bottom wall of the box body is H, and H is ≥ 3 mm.

[0014] Compared with the prior art, the battery pack provided by the present application allows external air to enter the cavity through the inlet and then leave the cavity through the outlet, that is, external air can flow through the cavity through the inlet and outlet, and take away the temperature at the bottom of the liquid cooling plate to quickly reduce the temperature of the liquid cooling plate, thereby facilitating the heat dissipation effect of the liquid cooling plate on the battery cell module. Moreover, in the event of thermal runaway of the battery pack, water can be poured into the cavity through the inlet or outlet to quickly cool the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 This is an axonometric view of the battery pack when the opening is closed in the first embodiment provided by the present application;

[0017] Figure 2 This is an axonometric view of the battery pack when the opening is opened in the first embodiment provided by the present application;

[0018] Figure 3 A top view of the battery pack in the first embodiment provided in the present application;

[0019] Figure 4 for Figure 3 Sectional view at AA;

[0020] Figure 5 for Figure 3 Cross-sectional view at BB;

[0021] Figure 6This is a schematic diagram of the battery pack opening in the second embodiment provided in the present application.

[0022] Figure numerals: 100, battery pack; 10, box body; 20, liquid cooling plate; 21, top plate; 22, bottom plate; 221, recessed portion; 23, flow channel; 30, battery cell module; 40, cavity; 41, inlet; 411, through hole; 42, outlet; 43, partition; 431, support surface; 432, channel; 44, air duct; 50, baffle. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0024] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0026] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0027] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0028] See also Figures 1 to 4 The present application provides a battery pack 100, which includes a box body 10, a liquid cooling plate 20 and a battery cell module 30. The liquid cooling plate 20 is installed inside the box body 10, and one side of the liquid cooling plate 20 is used to place the battery cell module 30, and the other side is spaced apart from the bottom wall of the box body 10 and is surrounded by the inner wall of the box body 10 to form a cavity 40. The cavity 40 has an inlet 41 and an outlet 42, and the inlet 41 and the outlet 42 are respectively opened on two opposite side walls of the box body 10. In this way, external air can enter the cavity 40 through the inlet 41 and then leave the cavity 40 through the outlet 42, that is, external air can circulate in the cavity 40 through the inlet 41 and the outlet 42, and take away the temperature of the bottom of the liquid cooling plate 20, so as to quickly reduce the temperature of the liquid cooling plate 20, thereby facilitating the improvement of the heat dissipation effect of the liquid cooling plate 20 on the battery cell module 30. Furthermore, in the event of thermal runaway of the battery pack 100 , water may be poured into the cavity 40 through the inlet 41 or the outlet 42 , thereby rapidly cooling the battery pack 100 .

[0029] The box 10 is a bowl-shaped structure formed by stamping a metal plate, that is, it is formed by a bottom wall and side walls surrounding the bottom wall. The liquid cooling plate 20 can be fixed inside the box 10 by welding or bolts. The battery cell module 30 is glued to the upper surface of the liquid cooling plate 20.

[0030] Preferably, the inlet 41 and the outlet 42 are arranged opposite to each other on two opposite side walls of the box body 10 , so that the external air can flow through the inlet 41 and the outlet 42 .

[0031] Alternatively, if Figure 2 As shown, the inlet 41 and / or the outlet 42 include a plurality of through holes 411, and the plurality of through holes 411 are arranged at intervals on the side wall of the box body 10. That is, one of the inlet 41 and the outlet 42 is configured to be composed of a plurality of through holes 411. Alternatively, the inlet 41 and the outlet may be both configured to be composed of a plurality of through holes 411.

[0032] In other embodiments, the inlet 41 or the outlet 42 may also be configured to be composed of a through hole with a larger area.

[0033] See also Figure 5A plurality of partitions 43 are arranged in the cavity 40, and the plurality of partitions 43 are arranged at intervals, and the cavity 40 is divided into a plurality of air ducts 44, and the air ducts 44 are connected with the inlet 41 and the outlet 42. In this way, the partitions 43 guide the external air to flow in the cavity 40, so that the external air can more evenly take away the heat at various positions at the bottom of the liquid cooling plate 20.

[0034] Optionally, in one embodiment, one end of the partition 43 is connected to the bottom wall of the box body 10, and the other end has a support surface 431, and the support surface 431 is close to the liquid cooling plate 20. In this way, the partition 43 can also support the liquid cooling plate 20 through the support surface 431, thereby facilitating the improvement of the bearing capacity of the liquid cooling plate 20.

[0035] Furthermore, the liquid cooling plate 20 includes a top plate 21 and a bottom plate 22 connected to each other, the bottom plate 22 is arranged close to the cavity 40, and the bottom plate 22 has a recessed portion 221 recessed toward the direction close to the cavity 40, the recessed portion 221 and the top plate 21 are spaced and surrounded to form a flow channel 23, and the flow channel 23 is used for the circulation of the cooling liquid; the support surface 431 abuts against the recessed portion 221. The recessed portion 221 is a weak position of the bottom plate 22, and by affixing the support surface 431 to the recessed portion 221, the supporting effect of the partition 43 on the liquid cooling plate 20 can be improved.

[0036] Specifically, the thickness of the top plate 21 and the bottom plate 22 is greater than or equal to 0.8 mm and less than or equal to 1.5 mm. The top plate 21 is configured as a flat plate, and the bottom plate 22 is formed by stamping to form a recessed portion 221. The height of the flow channel 23 is greater than or equal to 3 mm and less than or equal to 5 mm.

[0037] Furthermore, the partition 43 has a channel 432, which is arranged in parallel with the air duct 44 and connects the inlet 41 with the outlet 42. By providing the channel 432 on the partition 43, it is not only beneficial to increase the flow area of ​​the external air in the cavity, but also can reduce the weight of the partition 43.

[0038] In other embodiments, the partition 43 may also be provided in the form of a flat plate.

[0039] See also Figure 1 , Figure 2 and Figure 6The battery pack 100 also includes two baffles 50, one of which is installed at the inlet 41 and is used to open or close the inlet 41, and the other baffle 50 is installed at the outlet 42 and is used to open or close the outlet 42. By setting the baffles 50, the battery pack has two working modes. When the inlet 41 and the outlet 42 are closed at the same time by the two baffles 50, the cavity 40 forms a thermal insulation layer at the bottom of the liquid cooling plate 20, which can isolate the liquid cooling plate 20 from the external temperature, so that the liquid cooling plate 20 is not affected by the external temperature when heating or cooling the battery cell module 30. When the inlet 41 and the outlet 42 are opened at the same time by the two baffles 50, the external air can flow in the cavity 40 through the inlet 41 and the outlet 42, and take away the temperature at the bottom of the liquid cooling plate 20.

[0040] Furthermore, if Figure 4 As shown, the distance between the liquid cooling plate 20 and the bottom wall of the box 10 is H, and H ≥ 3mm. When the inlet 41 and the outlet 42 are closed at the same time by two baffles 50, in order to ensure the heat preservation effect of the cavity 40, the distance H between the liquid cooling plate 20 and the bottom wall of the box 10 needs to be large enough, that is, the cavity 40 needs to be thick enough. For example, the value of H can be 3mm, 3.5mm, 4mm, 5mm, etc., which can be set according to actual needs and are not listed here one by one.

[0041] Optionally, the opening size of the inlet 41 and / or the outlet 42 is configured to be adjustable. That is, one of the inlet 41 and the outlet 42 is configured to be adjustable in opening size, or both the inlet 41 and the outlet 42 are configured to be adjustable in opening size. In this way, the air intake of the cavity 40 can be adjusted according to the heat dissipation requirements.

[0042] There are two ways to adjust the opening size of the inlet 41 and / or the outlet 42 as follows.

[0043] Embodiment 1

[0044] like Figure 2 As shown, the baffle 50 is slidably connected to the outer side wall of the box body 10, and by sliding the baffle 50 along the outer side wall of the box body 10, the area blocked by the baffle 50 at the inlet 41 and / or the outlet 42 can be increased or decreased. Specifically, the baffle 50 can slide up and down or left and right along the side wall of the box body 10.

[0045] Embodiment 2

[0046] like Figure 6 As shown, the baffle 50 is hingedly connected to the outer wall of the box body 10, and by flipping the baffle 50 relative to the outer wall of the box body 10, the area blocked by the baffle 50 at the inlet 41 and / or outlet 42 can be increased or decreased.

[0047] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. A battery pack, characterized in that: The battery pack comprises a box (10), a liquid cooling plate (20) and a battery cell module (30); the liquid cooling plate (20) is installed inside the box (10); one side of the liquid cooling plate (20) is used to place the battery cell module (30); the other side is spaced apart from the bottom wall of the box (10) and is surrounded by the inner wall of the box (10) to form a cavity (40); the cavity (40) has an inlet (41) and an outlet (42); the inlet (41) and the outlet (42) are respectively opened on two opposite side walls of the box (10).

2. The battery pack according to claim 1, characterized in that: The battery pack further comprises two baffles (50), one of the baffles (50) being installed at the inlet (41) and used for opening or closing the inlet (41), and the other baffle (50) being installed at the outlet (42) and used for opening or closing the outlet (42).

3. The battery pack according to claim 2, characterized in that: The opening size of the inlet (41) and / or the outlet (42) is configured to be adjustable.

4. The battery pack according to claim 3, characterized in that: The baffle (50) is slidably connected to the outer wall of the box body (10), and by sliding the baffle (50) along the outer wall of the box body (10), the area blocked by the baffle (50) at the inlet (41) and / or the outlet (42) can be increased or decreased; Alternatively, the baffle (50) is hingedly connected to the outer wall of the box body (10), and by flipping the baffle (50) relative to the outer wall of the box body (10), the area blocked by the baffle (50) at the inlet (41) and / or the outlet (42) can be increased or decreased.

5. The battery pack according to claim 1, characterized in that: A plurality of partitions (43) are arranged in the cavity (40); the plurality of partitions (43) are arranged at intervals and divide the cavity (40) into a plurality of air ducts (44); the air ducts (44) connect the inlet (41) and the outlet (42).

6. The battery pack according to claim 5, characterized in that: One end of the partition (43) is connected to the bottom wall of the box body (10), and the other end has a support surface (431), and the support surface (431) is in contact with the liquid cooling plate (20).

7. The battery pack according to claim 6, characterized in that: The liquid cooling plate (20) comprises a top plate (21) and a bottom plate (22) connected to each other, the bottom plate (22) being arranged close to the cavity (40), and the bottom plate (22) having a recessed portion (221) recessed in a direction close to the cavity (40), the recessed portion (221) and the top plate (21) being spaced apart and enclosed to form a flow channel (23), the flow channel (23) being used for circulating cooling liquid; The supporting surface (431) abuts against the recessed portion (221).

8. The battery pack according to claim 5, characterized in that: The partition (43) has a channel (432), and the channel (432) is arranged in parallel with the air duct (44) and connects the inlet (41) and the outlet (42).

9. The battery pack according to claim 1, characterized in that: The inlet (41) and / or the outlet (42) comprises a plurality of through holes (411), and the plurality of through holes (411) are arranged at intervals on the side wall of the box body (10).

10. The battery pack according to claim 1, characterized in that: The distance between the liquid cooling plate (20) and the bottom wall of the box body (10) is H, and H is ≥ 3 mm.

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