Battery pack and battery device

Abstract

The utility model relates to a battery pack and a battery device, the battery pack comprises a box body and a box cover, the box cover and the box body are encircled to form an accommodating cavity for accommodating battery cells, the inner wall of the box body is provided with an inflow port for allowing cooling liquid to flow into the accommodating cavity, and the inner wall of the box body is also provided with a backflow port for allowing the cooling liquid to flow out of the accommodating cavity; the plane of the backflow port is higher than that of the inflow port. The cooling liquid flows into the accommodating cavity from the flow inlet and flows out of the accommodating cavity through the reflux inlet so as to cool the battery cell and reduce the temperature in the accommodating cavity; the cooling liquid does not pass through the box cover, so that the bearing of the box cover can be reduced; the cooling liquid can be sprayed out horizontally or upwards, and the overall flow direction of the cooling liquid in the accommodating cavity is also from bottom to top, so that compared with downward spraying of the cooling liquid, the acting force of the cooling liquid on the box body and the box cover can be reduced, deformation of the box body and the box cover is avoided, and the service life of the battery pack is prolonged.

Description

Technical Field

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

[0002] Batteries are core components of electrical equipment such as electric vehicles, and battery heat generation and heat control of the battery working environment have become one of the most concerned issues in thermal management.

[0003] In the related prior art, an immersion cycle cooling method of spraying downward from the battery pack cover is usually used to manage the heat of the batteries contained in the battery pack. However, the self-weight and spraying force of the coolant flowing through the cover will cause the cover to bear a large load, and the coolant sprayed downward will also have a large impact force on the box body under the action of its own weight and spraying force, which will cause the box body and the cover to be easily deformed. Utility Model Content

[0004] Based on this, it is necessary to provide a battery pack and a battery device to address the above problems, so as to avoid deformation of the battery pack body and cover during the liquid spraying process.

[0005] The utility model first provides a battery pack, including a box body and a box cover, the box cover and the box body are arranged to form a receiving cavity for receiving a battery cell, the inner wall of the box body is provided with an inlet for supplying a coolant to flow into the receiving cavity, the inner wall of the box body is also provided with a reflux port for supplying a coolant to flow out of the receiving cavity, and the plane where the reflux port is located is higher than the plane where the inlet port is located.

[0006] In the above-mentioned battery pack, since the inlet and the return port are both arranged on the box body, the coolant does not pass through the box cover, thereby reducing the load-bearing capacity of the box cover and preventing the coolant flowing through the box cover from exerting force on the box cover and causing the box cover to be easily deformed; since the plane where the return port is located is higher than the plane where the inlet is located, the coolant can be sprayed horizontally or upward, and the overall flow direction of the coolant in the accommodating cavity is also from bottom to top, thereby reducing the force of the coolant on the box body and the box cover compared to spraying the coolant downward, avoiding deformation of the box body and the box cover, and extending the service life of the battery pack.

[0007] In one embodiment, the box body includes a bottom wall and a side wall, the inlet is arranged on the bottom wall, and the return port is arranged on the side wall.

[0008] Such an arrangement satisfies the requirement that the overall flow direction of the coolant in the accommodating cavity is from bottom to top, and the coolant can be sprayed upward from the inlet on the bottom wall, avoiding a large impact force on the box body when the coolant is sprayed downward, and avoiding deformation of the box body.

[0009] In one embodiment, the side wall includes two first side walls that are opposite to each other and two second side walls that are adjacent to the first side walls. The return port is disposed on the first side walls, and both of the two first side walls are provided with the return port.

[0010] With such an arrangement, the coolant in the accommodating cavity can disperse and reflux toward the reflux ports of the two oppositely arranged first side walls to balance the flow in the accommodating cavity, so that the coolant is evenly distributed in the accommodating cavity, thereby improving the cooling effect and balancing the load-bearing capacity of the box.

[0011] In one embodiment, the length of the first side wall is greater than the length of the second side wall; and / or, along the length direction of the first side wall, the reflow port is centrally arranged on the first side wall.

[0012] With such a configuration, the length of the first side wall is greater than that of the second side wall, and the first side wall can accommodate a longer reflow path than the second side wall, so that the coolant reflowing from the first side wall can take away more heat on the side wall, thereby improving the cooling effect; the reflow port is centrally arranged on the first side wall to balance the load-bearing capacity of the box, maintain the overall balance of the battery pack, and optimize the reflow path of the coolant, thereby reducing the longest reflow path of the coolant in the accommodating cavity, improving the heat dissipation performance, and avoiding the situation where the reflow port is not centered along the length direction of the first side wall, and the distance between the inlet at the end of the bottom wall farther from the reflow port along the length direction of the first side wall is too far from the reflow port, and the distance difference between the reflow port and different inlets is too large, thereby affecting the balance of heat dissipation.

[0013] In one of the embodiments, the side wall and / or the bottom wall is provided with an inlet cavity communicated with the inlet port, and the side wall is provided with a reflux cavity communicated with the reflux port.

[0014] With such arrangement, the coolant flowing in the inlet cavity and the return cavity can take away the heat of the bottom wall and / or the side wall, thereby improving the cooling effect.

[0015] In one embodiment, the inlet chamber includes a first inlet chamber provided on the side wall, the side wall provided with the first inlet chamber is also provided with the reflux chamber, and the first inlet chamber on the same side wall is located below the reflux chamber; and / or, the inlet chamber includes a first inlet chamber provided on the side wall and a second inlet chamber provided on the bottom wall, the first inlet chamber is connected to the second inlet chamber, and the second inlet chamber is connected to the inlet port.

[0016] In this way, the inlet chamber includes a first inlet chamber provided on the side wall, and the side wall provided with the first inlet chamber is also provided with a reflux chamber. The first inlet chamber on the same side wall is located below the reflux chamber, so that when the first inlet chamber and the reflux chamber are provided on the same side wall at the same time, the reflux chamber can be close to the reflux port, and the first inlet chamber can be close to the inlet port, so as to simplify the internal structure of the side wall; the inlet chamber includes a first inlet chamber provided on the side wall and a second inlet chamber provided on the bottom wall, the first inlet chamber is connected to the second inlet chamber, and the second inlet chamber is connected to the inlet port, so that the coolant flowing in from the first inlet chamber of the side wall can flow into the second inlet chamber of the bottom wall and flow to the inlet port.

[0017] In one embodiment, the battery pack further includes an inlet pipe connected to the inlet chamber and a reflux pipe connected to the reflux chamber, wherein one end of the inlet pipe away from the inlet chamber is used to connect to a liquid outlet of a cooling device, and one end of the reflux pipe away from the reflux chamber is used to connect to a liquid inlet of a cooling device.

[0018] Such an arrangement can realize the circulation of the coolant, and the inlet chamber and the return chamber are connected to the cooling device through the inlet pipe and the return pipe respectively, which is also convenient for realizing the sealing of the cooling circuit and can simplify the structure of the box.

[0019] In one of the embodiments, the inlet pipe and the return pipe are arranged in the accommodating cavity, and extend out of the accommodating cavity through the side wall where the inlet cavity and the return cavity are not arranged, so as to be connected to a cooling device.

[0020] With such an arrangement, the inlet pipe and the return pipe are arranged in the accommodating cavity, which can protect the inlet pipe and the return pipe and prevent collision; the cooling equipment is located outside the accommodating cavity to avoid occupying the battery pack space and facilitate maintenance; the inlet pipe and the return pipe extend out of the accommodating cavity through the side wall where the inlet cavity and the return cavity are not set, to avoid encroaching on the space used for setting the inlet cavity and the return cavity on the side wall where the inlet cavity and the return cavity are set.

[0021] In one embodiment, there are multiple inlets, which are arranged at intervals, and the inlet cavity includes a second inlet cavity provided on the bottom wall and connected to the multiple inlets.

[0022] With such arrangement, the second inlet cavity facilitates the coolant to flow into the accommodating cavity from a plurality of inlets, without the need to construct a plurality of pipelines to connect the inlets one by one, thus simplifying the structure.

[0023] In one of the embodiments, a plurality of partitions arranged in parallel and at intervals are provided in the second inlet chamber, and the partitions divide the second inlet chamber into a plurality of flow channels, and each of the flow channels is connected to at least one of the inlet ports.

[0024] With such arrangement, the partition can play a guiding role, and the multiple flow channels separated by the partition can balance the flow at various locations in the second inlet cavity, thereby balancing the flow from multiple inlets to the accommodating cavity, and can also balance the load-bearing capacity of the bottom wall.

[0025] In one of the embodiments, the battery pack further includes a nozzle disposed at the inlet.

[0026] With such an arrangement, the nozzle can adjust the spray height, pressure and speed of the coolant, thereby facilitating the regulation of the cooling effect at various locations within the accommodating cavity, and the arrangement of the nozzle can also prevent the coolant from flowing back at the inlet.

[0027] The utility model also provides a battery device, comprising a battery cell and the battery pack as described above, wherein the battery cell is arranged in the accommodating cavity.

[0028] With such an arrangement, the coolant in the accommodating cavity can cool the battery cell to ensure that the battery cell can work normally.

[0029] In one of the embodiments, the plane where the reflow port is located is higher than the battery core.

[0030] With this arrangement, the coolant can completely immerse the battery cells, thereby improving the cooling effect on the battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] 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.

[0032] Figure 1 This is a schematic diagram of the three-dimensional structure of a battery device without a box cover according to an embodiment of the utility model;

[0033] Figure 2 The utility model provides Figure 1 Explosion diagram of

[0034] Figure 3 The utility model provides Figure 1 A schematic diagram of the three-dimensional structure of a battery pack without a box cover;

[0035] Figure 4 The utility model provides Figure 3 Schematic cross-sectional view along AA;

[0036] Figure 5 The utility model provides Figure 3 Schematic bottom view of the middle bottom wall.

[0037] Figure numerals: 1. box body; 11. inlet; 12. return port; 13. bottom wall; 131. second inlet chamber; 132. partition; 133. flow channel; 14. side wall; 141. first side wall; 142. second side wall; 143. first inlet chamber; 144. return chamber; 2. battery cell; 3. accommodating chamber; 4. inlet pipe; 5. return pipe; 6. nozzle. DETAILED DESCRIPTION

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] Batteries are core components of electric vehicles and other electrical equipment, and the heat generation of batteries and the heat control of the battery working environment have become one of the most concerned issues in thermal management. In the relevant prior art, the immersion cycle cooling method of spraying downward from the cover of the battery pack is usually used to manage the thermal state of the batteries contained in the battery pack. However, the self-gravity and spraying force of the coolant flowing through the cover will cause the cover to bear a large load, and the coolant sprayed downward will also have a large impact force on the box body under the action of its own gravity and spraying force, which will cause both the box body and the cover to be easily deformed.

[0044] In order to solve the above problems, Figures 1 to 5 As shown, the utility model first provides a battery pack to avoid deformation of the battery pack body and cover during the liquid spraying process.

[0045] like Figure 1 to Figure 2 As shown, specifically, the battery pack includes a box body 1 and a box cover (not shown in the figure), the box cover and the box body 1 are arranged to form a receiving cavity 3 for receiving the battery cell 2, the inner wall of the box body 1 is provided with an inlet 11 for the coolant to flow into the receiving cavity 3, the inner wall of the box body 1 is also provided with a reflux port 12 for the coolant to flow out of the receiving cavity 3, and the plane where the reflux port 12 is located is higher than the plane where the inlet port 11 is located.

[0046] In the battery pack provided by the embodiment of the utility model, external coolant flows into the accommodating cavity 3 from the inlet 11 and flows out of the accommodating cavity 3 through the reflux port 12. The coolant is used to cool the battery cell 2 accommodated in the accommodating cavity 3 and reduce the temperature in the accommodating cavity 3, thereby ensuring that the battery cell 2 can work normally. Since the inlet 11 and the reflux port 12 are both arranged on the box body 1, the coolant does not pass through the box cover, thereby reducing the load-bearing capacity of the box cover and preventing the coolant flowing through the box cover from exerting a force on the box cover, thereby causing the box cover to be easily deformed. Since the plane where the reflux port 12 is located is higher than the plane where the inlet 11 is located, the coolant can be sprayed horizontally or upward, and the overall flow direction of the coolant in the accommodating cavity 3 is also from bottom to top, which is opposite to the direction of the coolant's own gravity. Therefore, compared with the coolant spraying downward, the force of the coolant on the box body 1 and the box cover can be reduced, deformation of the box body 1 and the box cover can be avoided, and the service life of the battery pack can be extended.

[0047] In one embodiment, the coolant can be a liquid with good thermal conductivity and insulation properties, such as electronic fluoride liquid, hydrocarbons, silicone oil, etc., as long as it can ensure the cooling effect on the battery pack and the battery cell 2, and also ensure that the battery cell 2 can work normally. The embodiment of the utility model does not make specific restrictions here.

[0048] like Figure 3 As shown, in one embodiment, the box body 1 includes a bottom wall 13 and a side wall 14, the inlet 11 is arranged on the bottom wall 13, and the return port 12 is arranged on the side wall 14. Among them, the end of the side wall 14 away from the bottom wall 13 forms an opening of the accommodating chamber 3, and the box cover is closed on the opening and arranged opposite to the bottom wall 13. It can be understood that the plane where any position on the side wall 14 is located is higher than the bottom wall 13. The coolant is sprayed upward from the inlet 11 on the bottom wall 13, which avoids a large impact force on the box body 1 when the coolant is sprayed downward, avoids deformation of the box body 1, and is also convenient to meet the requirement that the overall flow direction of the coolant in the accommodating chamber 3 is from bottom to top.

[0049] like Figure 1 As shown, in one embodiment, the box body 1 can be a rectangular structure as shown in the figure, and the side wall 14 includes two first side walls 141 arranged opposite to each other and two second side walls 142 adjacent to the first side wall 141. The reflux port 12 is arranged on the first side wall 141, and the two first side walls 141 are both provided with the reflux port 12. The coolant in the accommodating chamber 3 can disperse and reflux to the reflux ports 12 of the two first side walls 141 arranged opposite to each other to balance the flow in the accommodating chamber 3, so that the coolant is evenly distributed in the accommodating chamber 3, thereby improving the cooling effect, balancing the load-bearing capacity of the box body 1, and maintaining the overall balance of the battery pack. Among them, the length direction of the first side wall 141 is defined as the X-axis direction, and the length direction of the second side wall 142 is defined as the Y-axis direction. Specifically, the number of the reflux ports 12 can be two, and the two reflux ports 12 can be respectively provided on the two first side walls 141.

[0050] like Figure 3 As shown, in one embodiment, the reflux port 12 is centrally arranged on the first side wall 141 along the length direction of the first side wall 141. As a result, the coolant in the accommodating chamber 3 can flow toward the middle area of ​​the first side wall 141 to balance the load-bearing capacity of the box body 1 and maintain the overall balance of the battery pack; it can also optimize the reflux path of the coolant, reduce the longest reflux path of the coolant in the accommodating chamber 3, improve the heat dissipation performance, and avoid the situation where the reflux port 12 is not centered along the length direction of the first side wall 141, and the distance between the inlet 11 at one end of the bottom wall 13 far from the reflux port 12 along the length direction of the first side wall 141 is too far from the reflux port 12, and the distance difference between the reflux port 12 and different inlet ports 11 is too large, which affects the balance of heat dissipation.

[0051] In one embodiment, the number of the return ports 12 may be one, two, three, four or more. When the number of the return ports 12 is one, one return port 12 is disposed on one of the first side walls 141 or the second side wall 142. When the number of the return ports 12 is multiple, any return port 12 may be disposed on any first side wall 141; any return port 12 among some of the return ports 12 may be disposed on any first side wall 141, and any return port 12 among the remaining return ports 12 may be disposed on any second side wall 142; any return port 12 may be disposed on any second side wall 142. As long as it can be ensured that the coolant in the accommodating cavity 3 can flow out from the return port 12, the embodiment of the utility model does not make any specific restrictions here.

[0052] In one embodiment, the housing 1 may also be a circular structure or other polygonal structure. When the number of the reflux ports 12 is two, three or more, the plurality of reflux ports 12 are arranged at circumferential intervals along the side wall 14 so that the coolant in the accommodating cavity 3 can reflux in a dispersed manner.

[0053] In one embodiment, the inlet 11 and the return port 12 may also be both disposed on the side wall 14. Among them, with respect to the inlet 11, at least one inlet 11 may be disposed on the first side wall 141, or at least one inlet 11 may be disposed on the second side wall 142; with respect to the return port 12, at least one return port 12 may be disposed on the first side wall 141, or at least one return port 12 may be disposed on the second side wall 142; as long as the plane where the return port 12 is located is higher than the plane where the inlet 11 is located, the embodiment of the utility model does not impose any specific restrictions here.

[0054] like Figure 3 to Figure 4 As shown, in one embodiment, at least one of the side wall 14 and the bottom wall 13 is provided with an inlet cavity connected to the inlet port 11, and the side wall 14 is provided with a reflux cavity 144 connected to the reflux port 12. The external coolant first flows into the inlet cavity, and the coolant in the inlet cavity then flows into the accommodating cavity 3 through the inlet port 11. The coolant in the accommodating cavity 3 first flows out to the reflux cavity 144 through the reflux port 12, and the coolant in the reflux cavity 144 then flows out of the battery pack. The coolant flowing in the inlet cavity and the reflux cavity 144 can take away the heat of the bottom wall 13 and / or the side wall 14, thereby improving the cooling effect on the battery pack as a whole.

[0055] like Figure 3 to Figure 4As shown, in one embodiment, the inlet cavity includes a first inlet cavity 143 provided on the side wall 14, and the side wall 14 provided with the first inlet cavity 143 is also provided with a return cavity 144, and the first inlet cavity 143 on the same side wall 14 is located below the return cavity 144. Since the plane where the return port 12 is located is higher than the plane where the inlet port 11 is located, the first inlet cavity 143 is provided below the return cavity 144, so that when the first inlet cavity 143 and the return cavity 144 are provided on the same side wall 14 at the same time, the return cavity 144 can be close to the return port 12, and the first inlet cavity 143 can be close to the inlet port 11, so as to simplify the internal structure of the side wall 14. When the two return ports 12 are respectively disposed on the two first side walls 141 , the two first side walls 141 are each provided with a return chamber 144 and a first inlet chamber 143 , and the coolant in the two first inlet chambers 143 converges into the inlet port 11 disposed on the bottom wall 13 to balance the load-bearing capacity of the box body 1 and maintain the overall balance of the battery pack.

[0056] Of course, in other embodiments, the first inlet cavity 143 and the return cavity 144 may also be respectively disposed on two or more different side walls 14 , as long as the overall balance of the battery pack can be ensured. The embodiments of the utility model are not specifically limited here.

[0057] like Figure 3 to Figure 4 As shown, in one embodiment, the inlet cavity includes a first inlet cavity 143 provided at the side wall 14 and a second inlet cavity 131 provided at the bottom wall 13, the first inlet cavity 143 is connected to the second inlet cavity 131, and the second inlet cavity 131 is connected to the inlet port 11. Specifically, the first inlet cavity 143 at the side wall 14 is connected to the second inlet cavity 131 at the bottom wall 13 at the bottom, the second inlet cavity 131 at the bottom wall 13 is connected to the inlet port 11, and the first inlet cavity 143 at the side wall 14 is connected to the inlet port 11 through the second inlet cavity 131 at the bottom wall 13. Thus, the coolant flowing in from the first inlet cavity 143 of the side wall 14 can flow into the second inlet cavity 131 of the bottom wall 13 and flow to the inlet port 11.

[0058] like Figures 2 to 4 As shown, in one embodiment, there are multiple inlets 11, and the multiple inlets 11 are arranged at intervals, and the inlet cavity includes a second inlet cavity 131 provided on the bottom wall 13 and connected to the multiple inlets 11. As a result, the coolant can flow into the accommodating cavity 3 from the multiple inlets 11 more evenly to balance the flow rate at various locations in the accommodating cavity 3, improve the cooling effect of the coolant on the accommodating cavity 3, and also balance the load-bearing capacity of the box body 1.

[0059] like Figures 3 to 5As shown, in one embodiment, the first inlet chambers 143 on both sides are connected to the second inlet chamber 131, and the coolant flows into the second inlet chamber 131 from both sides of the second inlet chamber 131, so as to balance the flow of the bottom wall 13 on both sides, and further balance the load-bearing of the box body 1. In particular, along the length direction of the first side wall 141, the communication port between the first inlet chamber 143 and the second inlet chamber 131 is centrally arranged at the contact point between the first side wall 141 and the bottom wall 13, so as to further balance the flow and balance the load-bearing of the box body 1.

[0060] Of course, in other embodiments, the second inlet cavity 131 may not be provided on the bottom wall 13, and the coolant in the first inlet cavity 143 is connected to the multiple inlet ports 11 through other means such as an external pipeline; or, the first inlet cavity 143 may not be provided on the side wall 14, and the external coolant directly flows into the second inlet cavity 131 and flows to the multiple inlet ports 11 through the second inlet cavity 131.

[0061] like Figures 4 to 5 As shown, in one embodiment, a plurality of partitions 132 arranged in parallel and spaced apart are provided in the second inlet chamber 131, and the partitions 132 divide the second inlet chamber 131 into a plurality of flow channels 133, and each flow channel 133 is connected to the first inlet chamber 143 and at least one inlet port 11. The partitions 132 can play a guiding role, and the plurality of flow channels 133 formed by the partitions 132 can balance the flow at various locations in the second inlet chamber 131, thereby balancing the flow from the plurality of inlets 11 to the accommodating chamber 3, and can also balance the load-bearing capacity of the bottom wall 13.

[0062] like Figures 3 to 5 As shown, in one embodiment, the partition 132 extends along the X-axis, and both ends of the partition 132 are spaced apart from the cavity wall of the second inlet cavity 131 by a certain distance, and the plurality of flow channels 133 separated by the partition 132 are connected in parallel. Figure 5 As shown by the arrows in the middle bottom wall 13, after the coolant in the first inlet cavity 143 enters the second inlet cavity 131 from both sides of the bottom wall 13 along the Y-axis, it can first flow to the two ends of the second inlet cavity 131 along the X-axis, and then be divided into multiple flow channels 133, and finally flow into the accommodating cavity 3 more evenly through multiple inlet ports 11.

[0063] Of course, in other embodiments, the partition 132 may also extend along the Y-axis or other directions, as long as the coolant can flow into the accommodating cavity 3 more evenly from the multiple inlets 11, and the embodiments of the utility model are not specifically limited here.

[0064] like Figures 2 to 4As shown, in one embodiment, the battery pack also includes an inlet pipe 4 connected to the inlet cavity and a return pipe 5 connected to the return cavity 144. The end of the inlet pipe 4 away from the inlet cavity is used to connect to the liquid outlet of the external cooling device (not shown), and the end of the return pipe 5 away from the return cavity 144 is used to connect to the liquid inlet of the cooling device. The cooled coolant in the cooling device flows into the accommodating cavity 3 through the inlet pipe 4, the inlet cavity and the inlet port 11 in turn. The coolant in the accommodating cavity 3 flows back to the cooling device through the return port 12, the return cavity 144 and the return pipe 5 in turn for cooling, and flows to the inlet pipe 4 again after cooling, thereby realizing the circulation of the coolant. In addition, the inlet cavity and the return cavity 144 are connected to the cooling device through the inlet pipe 4 and the return pipe 5 respectively, which is convenient for realizing the sealing of the cooling circuit and can also simplify the structure of the box 1. The cooling device is located outside the accommodating cavity 3 to avoid occupying the battery pack space and facilitate maintenance.

[0065] like Figures 1 to 4 As shown, in one embodiment, the inlet pipe 4 and the return pipe 5 are arranged in the accommodating chamber 3, and extend out of the accommodating chamber 3 through the side wall 14 where the inlet chamber and the return chamber 144 are not arranged, so as to connect the cooling device. The inlet pipe 4 and the return pipe 5 are arranged in the accommodating chamber 3, which can protect the inlet pipe 4 and the return pipe 5 and prevent them from being bumped. The inlet pipe 4 and the return pipe 5 extend out of the accommodating chamber 3 through the side wall 14 where the inlet chamber and the return chamber 144 are not arranged, so as to avoid occupying the space for setting the inlet chamber and the return chamber 144 on the side wall 14 where the inlet chamber and the return chamber 144 are arranged. When the first inlet chamber 143 and the return chamber 144 are arranged on the first side wall 141, the inlet pipe 4 and the return pipe 5 extend out of the accommodating chamber 3 through the second side wall 142. Specifically, the portion of the inlet pipe 4 located in the accommodating chamber 3 includes two branches, which are respectively connected to the first inlet chamber 143 on both sides, so that the inlet pipe 4 can unify the inflow path of the coolant; the portion of the return pipe 5 located in the accommodating chamber 3 includes two branches, which are respectively connected to the return chamber 144 on both sides, so that the return pipe 5 can unify the outflow path of the coolant, further simplifying the structure.

[0066] Of course, in other embodiments, under the condition that the coolant in the first inflow cavity 143 and the return cavity 144 does not leak, the inflow pipe 4 and the return pipe 5 can also extend out of the accommodating cavity 3 through the first side wall 141 and be connected to the cooling device. Alternatively, the inflow pipe 4 and the return pipe 5 can also be arranged outside the box body 1, the inflow pipe 4 is connected to the inflow cavity outside the box body 1, and the return pipe 5 is connected to the return cavity outside the box body 1.

[0067] like Figure 3 to Figure 4As shown, in one embodiment, the length of the first side wall 141 is greater than the length of the second side wall 142. In this way, it can be understood that when the reflow port 12 is provided on the first side wall 141, the coolant in the accommodating chamber 3 will flow toward the first side wall 141. Since the first side wall 141 is longer, the first side wall 141 can accommodate a longer reflow path than the second side wall 142, thereby being able to take away more heat in the accommodating chamber 3 and on the side wall 14, thereby improving the cooling effect. Furthermore, when a first inlet chamber 143 and a reflow chamber 144 are provided in the first side wall 141, the volumes of the first inlet chamber 143 and the reflow chamber 144 can be increased, that is, the contact area between the coolant in the first inlet chamber 143 and the reflow chamber 144 and the first side wall 141 can be increased, thereby improving the cooling effect. Specifically, the length of the first side wall 141 can refer to Figure 3 The length of the first side wall 141 along the X axis and the length of the second side wall 142 can refer to Figure 3 The length of the second side wall 142 along the Y axis.

[0068] like Figures 2 to 3 As shown, in one embodiment, the battery pack further includes a nozzle 6 disposed at the inlet 11. The nozzle 6 can adjust the spray height, pressure and speed of the coolant, so as to facilitate the regulation of the cooling effect at various locations in the accommodating cavity 3, and the arrangement of the nozzle 6 can also prevent the coolant from flowing back at the inlet 11. Among them, the caliber of the inlet 11 and the nozzle 6 and the height of the nozzle 6 can be adjusted according to actual needs to regulate the height, pressure and speed of the coolant sprayed by the nozzle 6, so that the cooling effect in the accommodating cavity 3 can better meet the needs.

[0069] In one embodiment, when there are multiple inlets 11, nozzles 6 may be provided on all inlets 11, or nozzles 6 may be provided on only some of the inlets 11 according to actual needs. For example, when the heat in the central area of ​​the accommodating cavity 3 is low and the heat in the surrounding area is high, nozzles 6 may be provided only on the inlets 11 in the surrounding area to improve the cooling effect on the surrounding area of ​​the accommodating cavity 3; or, when the heat in the central area of ​​the accommodating cavity 3 is high and the heat in the surrounding area is low, nozzles 6 may be provided only on the inlets 11 in the central area to improve the cooling effect on the central area of ​​the accommodating cavity 3.

[0070] In one embodiment, the nozzle 6 and the bottom wall 13 can be fixedly connected by gluing, welding, etc., or they can be assembled and fixed by a structure such as a barbed tree structure. As long as a reliable connection between the nozzle 6 and the bottom wall 13 and a sealing between the nozzle 6 and the inlet 11 can be ensured, the embodiment of the utility model is not specifically limited here.

[0071] like Figure 1 to Figure 2As shown, an embodiment of the utility model further provides a battery device, including a battery cell 2 and the above-mentioned battery pack, wherein the battery cell 2 is arranged in the accommodating cavity 3. The coolant in the accommodating cavity 3 can cool the battery cell 2 to ensure that the battery cell 2 can work normally. Among them, the number of battery cells 2 can be one, two, three or more, and a plurality of battery cells 2 are arranged at intervals on the bottom wall 13. The plurality of inlets 11 and the plurality of battery cells 2 are arranged alternately with each other, so that the coolant flowing into the accommodating cavity 3 from the inlet 11 can fully contact the battery cell 2, thereby improving the cooling effect on the battery cell 2. The battery cell 2 can be a cylindrical battery cell, a soft-pack battery cell or a square shell battery cell, etc. The plurality of battery cells 2 can be arranged in groups in the accommodating cavity 3, or they can be arranged in a dispersed manner.

[0072] like Figure 1 As shown, in one embodiment, the plane where the reflux port 12 is located is higher than the battery cell 2. That is to say, the liquid level of the coolant in the accommodating cavity 3 can be higher than the battery cell 2 and then flow back from the reflux port 12, and the coolant can completely immerse the battery cell 2, thereby further improving the cooling effect on the battery cell 2.

[0073] In one embodiment, foam glue may be arranged in the accommodating chamber 3. The foam glue may support and fix the inlet pipe 4 and / or the return pipe 5.

[0074] 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.

[0075] 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, It is characterized in that The invention comprises a box body (1) and a box cover, wherein the box cover and the box body (1) are arranged to form a receiving cavity (3) for receiving a battery cell (2), the inner wall of the box body (1) is provided with an inlet (11) for allowing a coolant to flow into the receiving cavity (3), and the inner wall of the box body (1) is also provided with a return port (12) for allowing the coolant to flow out of the receiving cavity (3), and the plane where the return port (12) is located is higher than the plane where the inlet port (11) is located.

2. The battery pack according to claim 1, It is characterized in that The box body (1) comprises a bottom wall (13) and a side wall (14); the inlet (11) is arranged on the bottom wall (13); and the return port (12) is arranged on the side wall (14).

3. The battery pack according to claim 2, It is characterized in that The side wall (14) comprises two first side walls (141) arranged opposite to each other and two second side walls (142) adjacent to the first side walls (141); the return port (12) is arranged on the first side walls (141); and the two first side walls (141) are both provided with the return port (12).

4. The battery pack according to claim 3, It is characterized in that The length of the first side wall (141) is greater than the length of the second side wall (142); and / or, Along the length direction of the first side wall (141), the return port (12) is centrally arranged on the first side wall (141).

5. The battery pack according to any one of claims 2 to 4, It is characterized in that The side wall (14) and / or the bottom wall (13) is provided with an inlet cavity communicated with the inlet port (11), and the side wall (14) is provided with a reflux cavity (144) communicated with the reflux port (12).

6. The battery pack according to claim 5, It is characterized in that The inflow chamber comprises a first inflow chamber (143) provided on the side wall (14); the side wall (14) provided with the first inflow chamber (143) is also provided with the return chamber (144); the first inflow chamber (143) on the same side wall (14) is located below the return chamber (144); and / or, The inlet chamber comprises a first inlet chamber (143) provided on the side wall (14) and a second inlet chamber (131) provided on the bottom wall (13); the first inlet chamber (143) is connected to the second inlet chamber (131); and the second inlet chamber (131) is connected to the inlet port (11).

7. The battery pack according to claim 5, It is characterized in that The battery pack further comprises an inlet pipe (4) connected to the inlet chamber and a return pipe (5) connected to the return chamber (144); an end of the inlet pipe (4) away from the inlet chamber is used to connect to a liquid outlet of a cooling device; an end of the return pipe (5) away from the return chamber (144) is used to connect to a liquid inlet of a cooling device.

8. The battery pack according to claim 7, It is characterized in that The inlet pipe (4) and the return pipe (5) are arranged in the accommodating chamber (3), and extend out of the accommodating chamber (3) through the side wall (14) where the inlet chamber and the return chamber (144) are not arranged, so as to be connected to a cooling device.

9. The battery pack according to claim 5, It is characterized in that The number of the inlet ports (11) is multiple, and the multiple inlet ports (11) are arranged at intervals. The inlet cavity comprises a second inlet cavity (131) which is arranged on the bottom wall (13) and is in communication with the multiple inlet ports (11).

10. The battery pack according to claim 9, It is characterized in that A plurality of partitions (132) arranged in parallel and spaced apart are provided in the second inlet chamber (131); the partitions (132) divide the second inlet chamber (131) into a plurality of flow channels (133); each of the flow channels (133) is connected to at least one of the inlet ports (11).

11. The battery pack according to claim 1, It is characterized in that The battery pack further comprises a nozzle (6) arranged at the inlet (11).

12. A battery device, It is characterized in that It comprises a battery cell (2) and a battery pack according to any one of claims 1 to 11, wherein the battery cell (2) is arranged in the accommodating cavity (3).

13. The battery device according to claim 12, It is characterized in that The plane where the reflux port (12) is located is higher than the battery core (2).

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