Battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery pack. The battery pack comprises an enclosure frame, a heat exchange plate and an adapter, wherein the enclosure frame is connected with the heat exchange plate, and the enclosure frame and the heat exchange plate enclose a cavity for accommodating a battery; the enclosure frame comprises a first side wall, and the first side wall is provided with a through hole. The heat exchange plate is provided with a first surface in the first direction, the first surface faces the enclosure frame, and a liquid exchange opening is formed in the end, close to the first side wall, of the first surface. The adapter is of an integrated structure, one end of the adapter is fixedly welded to the heat exchange plate, and the other end, away from the heat exchange plate, of the adapter is inserted into the through hole and fixedly welded to the first side wall. The adapter is provided with a flow channel, and the flow channel is communicated with the liquid changing opening. In the battery pack, the adapter, the heat exchange plate and the first side wall are respectively welded and fixed, so that the stability of the adapter is enhanced, the shaking between the adapter and the heat exchange plate is reduced, the risk of generating a gap at the joint of the adapter and the heat exchange plate is further reduced, and the sealing effect between the adapter and the heat exchange plate is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery pack. BACKGROUND

[0002] In the battery pack, in order to heat dissipation for battery, usually set up heat exchange plate at the bottom of battery. Heat exchange plate has liquid inlet, liquid outlet and the flow channel that links liquid inlet and liquid outlet, cooling liquid enters flow channel through liquid inlet, cooling liquid can exchange heat with battery in the flow channel and flow process, make the temperature of battery reduce, thereby reach the effect of heat dissipation for battery. Cooling liquid temperature rises after heat absorption from battery, and flows out from liquid outlet. Once cooling liquid leaks in liquid inlet and liquid outlet, then can cause battery short circuit, influence the use safety of battery pack. How to reduce the risk of cooling liquid leakage in liquid inlet and liquid outlet is the important means of guaranteeing the use safety of battery pack. SUMMARY

[0003] The utility model provides a kind of battery pack to reduce the risk of cooling liquid leakage in liquid inlet and liquid outlet of heat exchange plate.

[0004] The utility model embodiment provides a kind of battery pack, the battery pack includes enclosure, heat exchange plate and adapter;Wherein:

[0005] The enclosure is connected with the heat exchange plate, and the heat exchange plate is surrounded to form a cavity for accommodating the battery;The enclosure includes first side wall, and the first side wall has through-hole;

[0006] The heat exchange plate has first surface and second surface along first direction, the first surface is towards the battery, and the second surface is away from the battery;The first surface has liquid exchange port near one end of the first side wall;

[0007] The minimum distance of the through-hole to the plane where the second surface is first distance, and the maximum distance of the liquid exchange port to the plane where the second surface is second distance, and the first distance is greater than the second distance;

[0008] The adapter is an integral structure, one end of the adapter is welded and fixed with the heat exchange plate, another end of the adapter away from the heat exchange plate is inserted in the through-hole, and the adapter is welded and fixed with the first side wall;The adapter has flow channel, and the flow channel is communicated with the liquid exchange port.

[0009] The battery pack provided by the utility model embodiment has the following beneficial effects:

[0010] The battery pack comprises an adapter for connecting the heat exchange plate and the external pipeline, and the adapter is an integral structure. When the adapter is installed, the adapter and the heat exchange plate are welded and fixed, and the adapter and the first side wall are welded and fixed, so that the stability of the adapter is enhanced, the relative shaking between the adapter and the heat exchange plate is reduced, the risk of gap at the connection between the adapter and the heat exchange plate is reduced, and the sealing effect between the adapter and the heat exchange plate is improved. In addition, the welding makes the adapter and the heat exchange plate integrated, so that the sealing between the adapter and the heat exchange plate is enhanced, the risk of leakage of the cooling liquid at the liquid exchange port of the heat exchange plate is reduced, and the use safety of the battery pack is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 A structural schematic view of the battery pack provided by the embodiment of the present application is shown in the figure.

[0012] Figure 2 A structural schematic view of the adapter provided by the embodiment of the present application is shown in the figure.

[0013] Figure 3 Another structural schematic view of the battery pack provided by the embodiment of the present application is shown in the figure.

[0014] Figure 4 Another structural schematic view of the battery pack provided by the embodiment of the present application is shown in the figure.

[0015] Figure 5 Another structural schematic view of the battery pack provided by the embodiment of the present application is shown in the figure.

[0016] Figure 6 Another structural schematic view of the battery pack provided by the embodiment of the present application is shown in the figure.

[0017] Reference signs:

[0018] 10 - frame; 11 - first side wall;

[0019] 110 - through hole; 110a - total through hole;

[0020] 111 - groove; 20 - heat exchange plate;

[0021] 200 - liquid exchange port; 201 - first surface;

[0022] 202 - second surface; 30 - adapter;

[0023] 301 - flow channel; 31 - first adapter part;

[0024] 32 - second adapter part; 33 - connection body;

[0025] 34 - first branch; 35 - second branch;

[0026] 40 - Pipe joint; 50 - First weld;

[0027] 60 - Second weld; 70 - Battery. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0029] In the description of this application, unless otherwise expressly specified and limited, the terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term “multiple” refers to two or more; and the term “and / or” includes any and all combinations of one or more of the associated listed items. In particular, references to “the / described” object or “an” object are also intended to indicate one of a possible plurality of such objects.

[0030] Unless otherwise specified or stated, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] Furthermore, it should be understood that the directional terms such as "upper," "lower," "inner," and "outer" described in the exemplary embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the exemplary embodiments of this application. It should also be understood that, in the context of an element or feature being connected to another element(s) "upper," "lower," "inner," or "outer," it can be directly connected to the other element(s) "upper," "lower," "inner," or "outer," or indirectly connected to the other element(s) "upper," "lower," "inner," or "outer" through an intermediate element.

[0032] Figure 1 This is a schematic diagram of a battery pack provided in an embodiment of this application, such as... Figure 1As shown, in one embodiment, the battery pack includes a frame 10, a heat exchange plate 20, and an adapter 30. Specifically, the frame 10 and the heat exchange plate 20 are connected and together form a chamber for accommodating batteries 70. This chamber can accommodate multiple batteries 70, which are stacked sequentially along a predetermined direction to form a battery pack. The frame 10 includes multiple sidewalls, among which a first sidewall 11 has a through hole 110. Optionally, the first sidewall 11 can be located at the end of the battery pack or at the side of the battery pack. Alternatively, the plane of the first sidewall 11 can be perpendicular to or parallel to the stacking direction of the batteries 70.

[0033] The heat exchange plate 20 is located at the bottom of the battery 70. In high-temperature environments, the heat exchange plate 20 can be used to cool the battery 70. In low-temperature environments, the heat exchange plate 20 can also be used to heat the battery 70. The heat exchange plate 20 can maintain the battery 70 within a suitable temperature range, enabling the battery 70 to operate efficiently and safely, and helping to extend the service life of the battery 70.

[0034] The heat exchange plate 20 has a first surface 201 and a second surface 202, wherein the first surface 201 faces the battery 70 and the second surface 202 faces away from the battery 70. If the thickness direction of the heat exchange plate 20 is denoted as the second direction Z, then the first surface 201 and the second surface 202 are arranged along the second direction Z. The first surface 201 has a liquid exchange port 200, which communicates with the internal flow channel of the heat exchange plate 20. The liquid exchange port 200 is used to connect to an external component, allowing the transfer of a heat transfer medium between the external component and the heat exchange plate 20.

[0035] In one embodiment, the fluid exchange port 200 is located at the end of the first surface 201 near the first sidewall 11, thus allowing the fluid exchange port 200 to avoid the battery 70 and facilitating the placement of external components at the fluid exchange port 200. Furthermore, the first surface 201 has various possible structures, and the fluid exchange port 200 can be arranged in various ways depending on the structure of the first surface 201. In one embodiment, the first surface 201 is planar, and the fluid exchange port 200 can be located at the end of the first surface 201 near the first sidewall 11. In another embodiment, the end of the first surface 201 near the first sidewall 11 has a boss, and the fluid exchange port 200 can be located on the top or side surface of the boss.

[0036] Generally, there are two coolant exchange ports 200, one of which is an inlet and the other is an outlet. Coolant flows into the heat exchange plate 20 through the inlet. During its flow within the heat exchange plate 20, the coolant exchanges heat with the battery 70 to either cool or heat it. After heat exchange, the coolant flows out of the heat exchange plate 20 through the outlet.

[0037] Please continue to refer to this. Figure 1 A connector 30 is provided between the heat exchange plate 20 and the external pipeline. The connector 30 is an integral structure. The connector 30 is used to connect the heat exchange plate 20 and the external pipeline, serving as a connector. During installation, the connector 30 is located within the gap between the first sidewall 11 and the battery pack. One end of the connector 30 is welded to the heat exchange plate 20, and the other end, away from the heat exchange plate 20, is inserted into the through hole 110 of the first sidewall 11 and welded to it. The connector 30 has a flow channel 301, one end of which communicates with the liquid exchange port 200, and the other end of which communicates with the external pipeline.

[0038] It should be understood that "the adapter 30 is a one-piece structure" can refer to the adapter 30 being a single molded structure. For example, the adapter 30 may be a casting formed through a casting process. The aforementioned adapter 30 does not include adhesive layers or bolts or other connecting structures, and its manufacturing process is simple and low-cost. Alternatively, "the adapter 30 is a one-piece structure" can also refer to the adapter 30 being an integral structure formed by welding multiple sub-parts. The aforementioned adapter 30 has high sealing performance and is not prone to leakage. Furthermore, the adapter 30 has high structural strength, thereby reducing the risk of deformation under the impact of the heat-conducting medium and ensuring the smooth flow of the heat-conducting medium within the adapter 30.

[0039] In the aforementioned battery pack, by welding the adapter 30 and the heat exchange plate 20 together, and by welding the adapter 30 to the first sidewall 11, the stability of the adapter 30 is enhanced, the relative wobbling between the adapter 30 and the heat exchange plate 20 is reduced, thereby lowering the risk of gaps forming at the connection point and improving the sealing effect between them. Furthermore, welding integrates the adapter 30 and the heat exchange plate 20, further enhancing their sealing and reducing the risk of coolant leakage at the coolant inlet 200 of the heat exchange plate 20, thus ensuring the safety of the battery pack.

[0040] When a through hole 110 is provided in the first sidewall 11, the shape of the through hole 110 can be selected from various options. For example, the through hole 110 can be a round hole, an elliptical hole, or a rectangular hole. Of course, the through hole 110 can also be other shapes, which will not be listed here. When the through hole 110 is of any shape, the end of the adapter 30 away from the heat exchange plate 20 has a shape that is adapted to it.

[0041] Please continue to refer to this. Figure 1In one embodiment, the minimum distance from the through hole 110 to the plane containing the second surface 202 of the heat exchange plate 20 is a first distance D1, and the maximum distance from the liquid exchange port 200 to the plane containing the second surface 202 is a second distance D2, where D1 > D2. Taking the plane containing the second surface 202 of the heat exchange plate 20 as a reference plane, the position of the through hole 110 is higher than the position of the liquid exchange port 200. In other words, the through hole 110 is completely above the liquid exchange port 200. Correspondingly, the end of the adapter 30 welded to the first sidewall 11 is also higher than the end of the adapter 30 welded to the heat exchange plate 20, thereby allowing the heat transfer medium to flow into the heat exchange plate 20 under gravity after entering the adapter 30, increasing the flow rate of the heat transfer medium.

[0042] Figure 2 A schematic diagram of the structure of the adapter provided in an embodiment of this utility model is shown below. Figure 2 As shown, in one embodiment, the adapter 30 includes a first adapter portion 31 and a second adapter portion 32, which are interconnected. The first adapter portion 31 is welded to the heat exchange plate 20 and communicates with the internal flow channels of the heat exchange plate 20. The second adapter portion 32 is bent relative to the first adapter portion 31 towards the first sidewall 11, and is inserted into the through hole 110. The second adapter portion 32 is also welded to the first sidewall 11. The second adapter portion 32 is used to connect to an external pipeline, allowing the transfer of a heat transfer medium between the external pipeline and the heat exchange plate 20.

[0043] Optionally, the first adapter 31 and the second adapter 32 are welded together. Alternatively, the first adapter 31 and the second adapter 32 are an integral structure.

[0044] Please continue to refer to this. Figure 2 In one embodiment, both the first transition portion 31 and the second transition portion 32 are columnar structures. For example, the first transition portion 31 and the second transition portion 32 can be cylinders or square prisms. The dimensions of the first transition portion 31 and the second transition portion 32 can be the same or different. The included angle between the first transition portion 31 and the second transition portion 32 is θ, and θ satisfies the following formula: 60°≤θ≤120°. Optionally, the value of θ can be 70°, 80°, 90°, 100°, 110°, or other values ​​within the above range.

[0045] In one specific embodiment, the first adapter 31 and the second adapter 32 are vertically connected. In this case, θ is 90° or other values ​​close to 90°, such as 88°, 89°, 91°, or 92°. When θ is any of these values, it can be understood that the first adapter 31 and the second adapter 32 are vertically connected, forming an L-shaped structure.

[0046] Figure 3 This is another schematic diagram of the battery pack provided in the embodiments of this application, as shown below. Figure 3 As shown, in one embodiment, the battery pack further includes a pipe connector 40. The pipe connector 40 and the adapter 30 are welded together at the ends away from the heat exchange plate 20, and the flow channels 301 within the pipe connector 40 and the adapter 30 are connected. The pipe connector 40 is used to connect to an external pipe, allowing the external pipe to communicate with the internal flow channels 301 of the heat exchange plate 20 through the adapter 30. In practice, the pipe connector 40 and the external pipe can be connected by a plug-in connection, making installation and disassembly more convenient and quick. Furthermore, the welded connection between the pipe connector 40 and the adapter 30 provides a high degree of sealing, thereby reducing the risk of leakage.

[0047] Because the adapter 30 is welded to the first sidewall 11 and also to the pipe connector 40, two weld seams will be formed on the surface of the adapter 30. When the position where the adapter 30 is welded to the first sidewall 11 is close to the position where the adapter 30 is welded to the pipe connector 40, the distance between the two weld seams is short, which will result in poor welding quality of the later weld seams, thus affecting the connection effect between the adapter 30 and the corresponding component.

[0048] For the reasons stated above, the weld between the adapter 30 and the first sidewall 11 is designated as the first weld 50, and the weld between the adapter 30 and the pipe joint 40 is designated as the second weld 60. In one embodiment, the minimum distance between the first weld 50 and the second weld 60 is L, where L satisfies the following formula: 10mm ≤ L ≤ 30mm. Optionally, the value of L can be 12mm, 15mm, 18mm, 21mm, 24mm, 27mm, or other values ​​within the above range. When the value of L satisfies the above range, the welding quality of the first weld 50 and the second weld 60 can be guaranteed, thereby improving the connection effect between the adapter 30 and the corresponding component.

[0049] Figure 4 This is another schematic diagram of the battery pack provided in the embodiments of this application, as shown below. Figure 4As shown, in one embodiment, the first sidewall 11 of the frame 10 has a groove 111 on the surface opposite to the chamber. A through hole 110 corresponding to the adapter 30 is located on the bottom surface of the groove 111, and at least a portion of the pipe connector 40 is located within the groove 111. Specifically, the end of the adapter 30 away from the heat exchange plate 20 has a first end face, which is located within the groove 111. The pipe connector 40 is welded and fixed to the first end face, thereby allowing at least a portion of the pipe connector 40 to be accommodated within the groove 111. In the above embodiment, by accommodating at least a portion of the pipe connector 40 within the groove 111, the length of the portion of the pipe connector 40 extending beyond the first sidewall 11 can be reduced, thereby reducing the risk of the pipe connector 40 being damaged by impact.

[0050] Figure 5 This is another schematic diagram of the battery pack provided in the embodiments of this application, as shown below. Figure 5 As shown, in one embodiment, the heat exchange plate 20 has two liquid exchange ports 200, which are arranged at intervals along a first direction X. The first direction X is parallel to the plane containing the first sidewall 11, and also parallel to the plane containing the heat exchange plate 20. The centers of the two liquid exchange ports 200 are equidistant from the plane containing the first sidewall 11. One of the two liquid exchange ports 200 is an inlet for the heat-conducting medium to enter the heat exchange plate 20, and the other is an outlet for the heat-conducting medium to flow out of the heat exchange plate 20.

[0051] Correspondingly, the battery pack includes two adapters 30, which are also spaced apart along the first direction X, and each adapter 30 is used to communicate with a fluid exchange port 200. Additionally, the first sidewall 11 has two through holes 110, which are also spaced apart along the first direction X, and each through hole 110 corresponds to one adapter 30. The two adapters 30 can have identical structures and are spaced apart above the heat exchange plate 20, without spatial stacking.

[0052] In the above embodiment, the two adapters 30 are independent of each other, and the two through holes 110 included in the first sidewall 11 are also independent of each other, with each adapter 30 inserted into one through hole 110. Furthermore, the ends of the two adapters 30 away from the heat exchange plate 20 can be connected as a single unit. Correspondingly, the two through holes 110 in the first sidewall 11 corresponding to the two adapters 30 are connected to form a main through hole 110a, in which the ends of the two adapters 30 away from the heat exchange plate 20 are inserted. The following describes in detail the battery pack having the aforementioned adapters 30.

[0053] Figure 6 Another structural schematic diagram of the battery pack provided in this embodiment of the present invention is shown below. Figure 6As shown, in one embodiment, the first sidewall 11 includes a main through hole 110a. Two adapters 30 are connected to form a single integral component, which includes a connecting body 33, a first branch 34, and a second branch 35, arranged side-by-side and spaced apart. The connecting body 33 is inserted into the main through hole 110a and welded to the first sidewall 11. The first branch 34 and the second branch 35 are welded to the heat exchange plate 20 and communicate with different heat exchange ports 200.

[0054] Specifically, when flow channels are provided within the aforementioned integral component, in one embodiment, the connecting body 33 has a first flow channel and a second flow channel, and the first branch 34 and the second branch 35 also each have flow channels. The first flow channel and the flow channel within the first branch 34 are connected, and the second flow channel and the flow channel within the second branch 35 are also connected.

[0055] Specifically, when connecting the aforementioned integral component to the first sidewall 11, the connecting body 33 is first inserted into the main through hole 110a, and then the circumferential edge of the connecting body 33 is welded and fixed to the first sidewall 11. Compared with two independent adapters 30, the weld length between the aforementioned integral component and the first sidewall 11 is less than the sum of the weld lengths between the two adapters 30 and the first sidewall 11, thereby saving solder and avoiding welding quality problems caused by the close proximity of the two adapters 30. Meanwhile, when welding two independent adapters 30, the close proximity of the two adapters 30 results in a small space between them, making operation inconvenient. However, when welding the aforementioned integral component, the circumference of the connecting body 33 has a larger operating space, thus facilitating welding.

[0056] In one embodiment, the integral component can be manufactured using processes such as casting. After manufacturing, the integral component can be considered as a combination of two adapter components 30 in both form and function. In another embodiment, each adapter component 30 includes a first adapter portion 31 and a second adapter portion 32. The two adapter components 30 are connected by welding the second adapter portions 32 to form the integral component. The two second adapter portions 32, after welding, form a connecting body 33, and the two second adapter portions 32 respectively form a first branch 34 and a second branch 35.

[0057] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A battery pack, characterized in that, Includes the enclosure, heat exchange plates, and adapters; The frame is connected to the heat exchange plate and together they form a chamber for accommodating the battery; the frame includes a first sidewall with a through hole. The heat exchange plate has a first surface and a second surface, the first surface facing the battery and the second surface facing away from the battery; The first surface has a liquid exchange port at one end near the first sidewall; The minimum distance from the through hole to the plane containing the second surface is the first distance, and the maximum distance from the liquid exchange port to the plane containing the second surface is the second distance. The first distance is greater than the second distance. The adapter is an integral structure. One end of the adapter is welded and fixed to the heat exchange plate, and the other end of the adapter away from the heat exchange plate is inserted into the through hole. The adapter is also welded and fixed to the first side wall. The adapter has a flow channel, which is connected to the liquid exchange port.

2. The battery pack as described in claim 1, characterized in that, The adapter includes a first adapter portion and a second adapter portion, and the first adapter portion and the second adapter portion are interconnected. The first adapter and the heat exchange plate are welded and fixed together; the second adapter is bent relative to the first adapter toward the first side wall, the second adapter is inserted into the through hole, and the second adapter and the first side wall are welded and fixed together.

3. The battery pack as described in claim 2, characterized in that, Both the first and second adapters are columnar structures, and the first and second adapters are vertically connected.

4. The battery pack as described in claim 1, characterized in that, The battery pack also includes a pipe connector, which is welded to the end of the adapter away from the heat exchange plate, and the pipe connector is connected to the flow channel.

5. The battery pack as described in claim 4, characterized in that, The adapter and the first sidewall have a first weld, and the adapter and the pipe joint have a second weld. The minimum distance between the first weld and the second weld is L, and L satisfies the following formula: 10mm≤L≤30mm.

6. The battery pack as described in claim 4, characterized in that, The first sidewall has a groove on the side surface opposite to the chamber, the through hole is located on the bottom surface of the groove, and at least part of the pipe joint is located in the groove.

7. The battery pack according to any one of claims 1 to 6, characterized in that, The heat exchange plate has two liquid exchange ports, which are arranged at intervals along a first direction; the first direction is parallel to the plane containing the first sidewall and the plane containing the second surface. The battery pack includes two adapters, which are also spaced apart along the first direction, and each adapter is connected to a fluid exchange port. The first sidewall has two through holes, which are also spaced apart along the first direction, and each through hole is provided with a connector.

8. The battery pack as described in claim 7, characterized in that, The two through holes are connected to form a main through hole; The ends of the two adapters furthest from the heat exchange plate are connected as one unit and inserted into the main through hole.

9. The battery pack according to any one of claims 1 to 6, characterized in that, The adapter is a casting.

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