Battery pack

Abstract

The utility model discloses a battery pack. The battery pack comprises a box body, a plurality of battery packs and a plurality of liquid cooling plates, the plurality of battery packs are arranged in the box body, the plurality of battery packs are sequentially arranged in the first direction, each liquid cooling plate is provided with a liquid inlet and a liquid outlet, and the liquid cooling plates are arranged on at least one side of the battery packs in the first direction; at least one liquid supply opening is formed in the liquid inlet main pipe, and the liquid inlets are in one-to-one correspondence with the liquid supply openings and are communicated with the liquid supply openings; the at least one flow adjusting part is arranged at the liquid inlet and used for adjusting the liquid inlet flow of the liquid inlet. According to the battery pack disclosed by the utility model, the cooling efficiency, the cooling uniformity and the safety of the battery pack can be improved by arranging the liquid cooling plate on at least one side of the battery pack, and the directional cooling of the battery pack in the battery pack can be realized by arranging the flow adjusting piece at the liquid inlet, so that the safety of the battery pack is further improved.

Description

Technical Field

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

[0002] In the related art, a liquid cooling plate is provided in the battery pack to cool the batteries. The contact area between the liquid cooling plate and the batteries in the battery pack is small, resulting in low cooling efficiency of the battery pack. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a battery pack, which can improve the cooling efficiency and cooling uniformity of the battery pack.

[0004] According to the utility model, the battery pack includes: a box body; a plurality of battery groups and a plurality of liquid cooling plates, wherein the plurality of battery groups are arranged in the box body, and the plurality of battery groups are arranged in sequence in a first direction, the liquid cooling plate has a liquid inlet and a liquid outlet, and each group of battery groups is provided with the liquid cooling plate on at least one side in the first direction; a liquid inlet main pipe, wherein at least one liquid supply port is formed on the liquid inlet main pipe, and the liquid inlet corresponds to and is connected with the liquid supply port one by one; and at least one flow regulating member, wherein the flow regulating member corresponds to the liquid inlet one by one, and the flow regulating member is provided at the liquid inlet for regulating the liquid inlet flow rate of the liquid inlet.

[0005] According to the battery pack of the utility model, by providing a liquid cooling plate on at least one side of the battery pack, on the one hand, the cooling area of ​​the battery pack can be increased, and the liquid cooling plate can perform cooling at multiple positions in the battery pack, and on the other hand, the liquid cooling plate can block high-temperature and high-pressure substances generated by thermal runaway, thereby improving the cooling efficiency, cooling uniformity and safety of the battery pack, and by providing a flow regulating member at the liquid inlet, directional cooling of the battery pack in the battery pack can be achieved, thereby further improving the safety of the battery pack.

[0006] According to some embodiments of the present utility model, the flow regulating component is an electrically controlled valve, the battery pack further includes a battery management system, and the flow regulating component is electrically connected to the battery management system.

[0007] According to some embodiments of the present invention, two battery packs adjacent to each other in the first direction are connected to two sides of the same liquid cooling plate in the thickness direction.

[0008] According to some embodiments of the utility model, the battery pack includes a plurality of battery groups arranged in sequence in a second direction, the liquid cooling plate is connected to the plurality of battery groups in the battery pack, the battery group includes one battery cell or a plurality of battery cells arranged in sequence in a third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0009] According to some embodiments of the present invention, the third direction is a thickness direction of the battery cells in the battery group.

[0010] According to some embodiments of the present invention, the liquid outlet and the liquid inlet are respectively arranged at the two ends of the liquid cooling plate in the second direction, and the battery pack also includes: a liquid outlet main pipe, the liquid outlet main pipe is formed with at least one liquid collecting port, and the liquid collecting port corresponds to the liquid outlet one by one and is connected.

[0011] According to some embodiments of the utility model, a plurality of cooling channels extending along the second direction are defined in the liquid cooling plate, the plurality of cooling channels are evenly arranged in the third direction, and both ends of the cooling channels are respectively connected to the liquid inlet and the liquid outlet.

[0012] According to some embodiments of the present invention, the liquid inlet is located in the middle of the liquid cooling plate in the third direction.

[0013] According to some embodiments of the utility model, the liquid inlet main pipe has a liquid inlet pipe portion, the liquid supply port is formed on the liquid inlet pipe portion, the liquid inlet pipe portion extends along the first direction and is arranged on a side of the plurality of battery packs close to the liquid inlet in the second direction, the liquid outlet main pipe has a liquid outlet pipe portion, the liquid collecting port is formed on the liquid outlet pipe portion, the liquid outlet pipe portion extends along the first direction and is arranged on a side of the plurality of battery packs close to the liquid outlet in the second direction, and in the third direction, both the liquid inlet pipe portion and the liquid outlet pipe portion do not exceed the plurality of battery packs.

[0014] According to some embodiments of the present invention, an insulating layer is formed on the bottom wall of the box body, and the battery pack is supported on the insulating layer.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of a battery pack according to an embodiment of the utility model;

[0017] Figure 2 yes Figure 1The schematic diagram of the battery pack shown in FIG. 1 does not include a housing;

[0018] Figure 3 is a cross-sectional view of a liquid cooling plate according to an embodiment of the utility model;

[0019] Figure 4 is a cross-sectional view of another state of the liquid cooling plate according to an embodiment of the utility model;

[0020] Figure 5 It is a cross-sectional view of another state of the liquid cooling plate according to an embodiment of the utility model.

[0021] Reference numerals:

[0022] 100. Battery pack;

[0023] 10. Battery pack; 11. Battery group; 111. Battery monomer;

[0024] 20. Liquid cooling plate; 21. Liquid inlet; 22. Cooling channel;

[0025] 30. Liquid inlet main pipe; 31. Liquid inlet pipe; 32. Liquid supply port;

[0026] 40. Flow regulating parts;

[0027] 50. Liquid outlet pipe;

[0028] 60. Box body. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0030] Reference below Figure 1-Figure 5 A battery pack 100 according to an embodiment of the present invention is described.

[0031] like Figure 1-Figure 3 As shown, the battery pack 100 according to the embodiment of the present invention includes: a box body 60, a plurality of liquid cooling plates 20, a plurality of battery packs 10, a liquid inlet main pipe 30 and at least one flow regulating member 40.

[0032] For example, the number of battery packs 10 may be two, three, eight, ten or fifteen, etc. The number of liquid cooling plates 20 may be three, nine or seventeen, etc. The number of flow regulating members 40 may be one, two, seven, nine or fourteen, etc.

[0033] Specifically, the plurality of battery packs 10 are disposed in the box 60, and the plurality of battery packs 10 are arranged in a first direction (eg Figure 1 The liquid cooling plate 20 has a liquid inlet 21 and a liquid outlet, and each battery group 10 is provided with a liquid cooling plate 20 on at least one side in the first direction. That is to say, each battery group 10 may be provided with a liquid cooling plate 20 on one side in the first direction, or each battery group 10 may be provided with a liquid cooling plate 20 on both sides in the first direction.

[0034] At least one liquid supply port 32 is formed on the liquid inlet main pipe 30. For example, the liquid supply port 32 may be one, two, seven, nine or fourteen. The liquid inlet 21 corresponds to the liquid supply port 32 one by one and is connected. The flow regulating member 40 corresponds to the liquid inlet 21 one by one. The flow regulating member 40 is disposed at the liquid inlet 21 for regulating the liquid flow rate of the liquid inlet 21.

[0035] During the operation of the battery pack 100 , the cooling medium flows into the liquid inlet 21 from the liquid supply port 32 on the liquid inlet main pipe 30 , then enters the liquid cooling plate 20 from the liquid inlet 21 and flows out from the liquid outlet. The cooling medium can exchange heat with the battery pack 10 in the liquid cooling plate 20 , thereby cooling the battery pack 100 .

[0036] Among them, the battery pack 10 is provided with a liquid cooling plate 20 on at least one side in the first direction, which can increase the cooling area of ​​the battery pack 10, and can be cooled at multiple positions in the battery pack 100, so that the cooling efficiency and cooling uniformity of the battery pack 100 can be improved. At the same time, when the battery pack 10 is provided with liquid cooling plates 20 on both sides in the first direction, the liquid cooling plates 20 can be cooled on both sides of the battery pack 10, further improving the cooling uniformity of the battery pack 100.

[0037] It can be understood that in the first direction, the liquid cooling plate 20 can provide a barrier between the battery packs 10. In this way, when a battery pack 10 in the battery pack 100 has a thermal runaway, the liquid cooling plate 20 can prevent the thermal runaway from spreading between different battery packs 10 in the first direction, thereby improving the safety of the battery pack 100.

[0038] During the operation of the battery pack 100, it is inevitable that there will be differences in the temperatures of the various battery groups 10. In this embodiment, by providing a flow regulator 40 at the liquid inlet 21, when the temperature of a battery group 10 in the battery pack 100 is too high, the flow regulator 40 can be used to increase the flow of the liquid cooling plate 20 corresponding to the battery group 10 with too high a temperature. For example, the opening of the flow regulator 40 on the corresponding liquid cooling plate 20 can be increased; or the opening of the flow regulator 40 on other normally operating liquid cooling plates 20 can be reduced to increase the fluid pressure in the liquid inlet main pipe 30, thereby improving the cooling efficiency of the battery group 10 with too high a temperature, thereby further improving the safety of the battery pack 100.

[0039] Among them, each liquid cooling plate 20 is connected in parallel on the liquid inlet main pipe 30 , and the flow regulating member 40 is arranged at the liquid inlet 21 , so that different liquid cooling plates 20 can independently perform flow regulation, thereby improving the accuracy of directional cooling of the battery pack 100 .

[0040] It is understandable to those skilled in the art that when the temperature of the battery pack 100 is too low, a heat exchange medium with a higher temperature may be introduced into the liquid cooling plate 20 to heat the battery pack 10 , thereby improving the working efficiency of the battery pack 100 .

[0041] According to the battery pack 100 of the embodiment of the utility model, by providing a liquid cooling plate 20 on at least one side of the battery pack 10, on the one hand, the cooling area of ​​the battery pack 10 can be increased, and the liquid cooling plate 20 can be cooled at multiple positions in the battery pack 100, and on the other hand, the liquid cooling plate 20 can block high-temperature and high-pressure substances generated by thermal runaway, thereby improving the cooling efficiency, cooling uniformity and safety of the battery pack 100, and by providing a flow regulating member 40 at the liquid inlet 21, directional cooling of the battery pack 10 in the battery pack 100 can be achieved, thereby further improving the safety of the battery pack 100.

[0042] In some embodiments of the present invention, Figure 3-Figure 5 As shown, the flow regulating member 40 is an electric control valve, and the battery pack 100 also includes a battery management system, and the flow regulating member 40 is electrically connected to the battery management system. Among them, the battery management system can collect the temperature information of the battery cells 111 in the battery pack 10, and send corresponding instructions to the electric control valve by judging the temperature information. The electric control valve adjusts the opening according to the instruction to adjust the liquid inlet flow, thereby realizing automatic adjustment of the flow in each liquid cooling plate 20, and then realizing automatic directional cooling in the battery pack 100, further improving the safety of the battery pack 100, and can improve the user experience.

[0043] For example, Figure 3 As shown, when the battery pack 100 works normally, the battery management system sends instructions to the electronically controlled valves, and the electronically controlled valves connected in series to the liquid inlets 21 of each liquid cooling plate 20 are kept in a fully open state, so that the liquid cooling plate 20 can cool or heat the battery pack 100 normally.

[0044] like Figure 4 As shown, when the temperature of some battery cells 111 is too high, the battery management system collects temperature information and sends instructions to each electronically controlled valve. The electronically controlled valves connected in series to the liquid cooling plate 20 corresponding to the battery pack 10 with abnormal temperature are in a fully open state, and the electronically controlled valves in the normal temperature area reduce their openings, so that more coolant can flow to the liquid cooling plate 20 corresponding to the battery pack 10 with abnormal temperature, thereby achieving directional cooling.

[0045] like Figure 5 As shown, when some battery cells 111 experience thermal runaway, the battery management system sends instructions to each electronically controlled valve, the electronically controlled valves in the normal area are all in a closed state, and the electronically controlled valves corresponding to the battery pack 10 experiencing thermal runaway are in a fully open state, so that more coolant flows to the liquid cooling plate 20 corresponding to the battery pack 10 experiencing thermal runaway, so as to cool the battery pack 10 experiencing thermal runaway.

[0046] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, two battery packs 10 adjacent in the first direction are connected to both sides of the same liquid cooling plate 20 in the thickness direction. Thus, the structure inside the battery pack 100 can be made more compact and the structure of the battery pack 100 can be made more stable.

[0047] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the battery pack 10 includes a plurality of Figure 1 The battery groups 11 are sequentially arranged in the front-to-back direction (forward and backward direction shown in FIG), for example, the battery groups 11 may be two, three or four, the liquid cooling plate 20 is connected to the plurality of battery groups 11 in the battery pack 10, and the battery group 11 includes a battery cell 111 or a plurality of battery cells 111 arranged in the third direction (for example, Figure 2 The battery cells 111 are sequentially arranged in the up-down direction (as shown in FIG. 1 ), for example, the battery cells 111 may be one, two, four or seven, and the first direction, the second direction and the third direction are perpendicular to each other.

[0048] Among them, the liquid cooling plate 20 is connected to multiple battery groups 11 in the battery pack 10. The liquid cooling plate 20 can cool each battery group 11 to further improve the cooling efficiency and cooling uniformity of the battery pack 100, and the liquid cooling plate 20 can fix the multiple battery groups 11 to improve the structural stability of the battery pack 100. Preferably, the liquid cooling plate 20 is connected to each battery cell 111 in the battery group 11. In this way, the effect of the liquid cooling plate 20 can be further improved.

[0049] In some embodiments of the present invention, Figure 2 As shown, the third direction is the thickness direction of the battery cells 111 in the battery group 11. It can be understood that the liquid cooling plate 20 is arranged at multiple positions in the battery pack 100, which can easily meet the cooling needs of the battery pack 100. The thickness direction of the battery cell 111 is the direction of the minimum size of the battery cell 111. In this way, when the liquid cooling plate 20 is in contact with each battery cell 111, the size of the liquid cooling plate 20 in the third direction can be made smaller, thereby saving materials used in the production of the liquid cooling plate 20 and reducing the production cost of the battery pack 100.

[0050] In some embodiments of the present invention, Figure 2 As shown, the liquid outlet and the liquid inlet 21 are respectively arranged at the two ends of the liquid cooling plate 20 in the second direction, and the battery pack 100 further includes: a liquid outlet main pipe 50, the liquid outlet main pipe 50 is formed with at least one liquid collecting port, and the collecting port corresponds to and is connected with the liquid outlet. In this way, during the operation of the battery pack 100, the cooling medium flows in from one end of the liquid cooling plate 20 and out from the other end, which can make the pressure distribution in the liquid cooling plate 20 more uniform, and the cooling medium flows more smoothly in the liquid cooling plate 20, thereby reducing the vibration of the liquid cooling plate 20 during the operation of the battery pack 100 and improving the stability of the operation of the battery pack 100.

[0051] In some embodiments of the present invention, Figure 3-Figure 5 As shown, a plurality of cooling channels 22 extending along the second direction are defined in the liquid cooling plate 20, and the plurality of cooling channels 22 are evenly arranged in the third direction, and the two ends of the cooling channels 22 are respectively connected to the liquid inlet 21 and the liquid outlet. When the cooling medium enters the liquid cooling plate 20 from the liquid inlet 21, the cooling medium flows into the plurality of cooling channels 22 respectively, and then flows out from the liquid outlet through the plurality of cooling channels 22, thereby improving the uniformity of the distribution of the cooling medium in the liquid cooling plate 20, thereby further improving the uniformity of the cooling in the battery pack 100.

[0052] In some embodiments of the present invention, Figure 3-Figure 5 As shown, the liquid inlet 21 is located in the middle of the liquid cooling plate 20 in the third direction. In this way, the uniformity of the distribution of the cooling medium in the liquid cooling plate 20 can be further improved, thereby further improving the uniformity of cooling in the battery pack 100.

[0053] In some embodiments of the present invention, Figure 2 As shown, the liquid inlet main pipe 30 has a liquid inlet pipe portion 31, a liquid supply port 32 is formed on the liquid inlet pipe portion 31, the liquid inlet pipe portion 31 extends along a first direction and is arranged on a side of the plurality of battery packs 10 close to the liquid inlet 21 in the second direction, the liquid outlet main pipe 50 has a liquid outlet pipe portion, a liquid collecting port is formed on the liquid outlet pipe portion, the liquid outlet pipe portion extends along a first direction and is arranged on a side of the plurality of battery packs 10 close to the liquid outlet in the second direction, and in the third direction, both the liquid inlet pipe portion 31 and the liquid outlet pipe portion do not exceed the plurality of battery packs 10.

[0054] Thus, the connecting pipes between the liquid inlet pipe 30, the liquid outlet pipe 50 and the liquid cooling plate 20 can be shortened, and the uniformity of the distribution of components in the battery pack 100 can be improved. At the same time, the space occupied by the liquid inlet pipe part 31 and the liquid outlet pipe part in the third direction overlaps with the battery pack 10, which can reduce the size of the battery pack 100 in the third direction.

[0055] In some embodiments of the present invention, an insulating layer is formed on the bottom wall of the box body 60, and the battery pack 10 is supported on the insulating layer. It is understandable that the battery pack 100 will inevitably vibrate during operation. When the insulating films on multiple battery cells 111 in the battery pack 100 are worn, the battery cells 111 contact the insulating layer, which can achieve a short circuit between the battery cells 111 with worn insulating films, further improving the safety of the battery pack 100 during operation.

[0056] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0057] 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 one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0058] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0060] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: include: Box; A plurality of battery packs and a plurality of liquid cooling plates, wherein the plurality of battery packs are arranged in the box, the plurality of battery packs are arranged in sequence in a first direction, the liquid cooling plate has a liquid inlet and a liquid outlet, and at least one side of each battery pack in the first direction is provided with the liquid cooling plate; A liquid inlet main pipe, wherein at least one liquid supply port is formed on the liquid inlet main pipe, and the liquid inlet port corresponds to and is in communication with the liquid supply port in a one-to-one manner; At least one flow regulating member, wherein the flow regulating member corresponds to the liquid inlet one by one, and the flow regulating member is arranged at the liquid inlet to regulate the liquid inlet flow rate of the liquid inlet.

2. The battery pack according to claim 1, characterized in that: The flow regulating component is an electrically controlled valve, and the battery pack further includes a battery management system, and the flow regulating component is electrically connected to the battery management system.

3. The battery pack according to claim 1, characterized in that: Two battery packs adjacent to each other in the first direction are connected to two sides of the same liquid cooling plate in the thickness direction.

4. The battery pack according to claim 1, characterized in that: The battery pack includes multiple battery groups arranged in sequence in a second direction, the liquid cooling plate is connected to the multiple battery groups in the battery pack, the battery groups include one battery cell or multiple battery cells arranged in sequence in a third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

5. The battery pack according to claim 4, characterized in that: The third direction is a thickness direction of the battery cells in the battery group.

6. The battery pack according to claim 4, characterized in that: The liquid outlet and the liquid inlet are respectively arranged at two ends of the liquid cooling plate in the second direction. The battery pack further comprises: a liquid outlet main pipe, the liquid outlet main pipe is formed with at least one liquid collecting port, and the liquid collecting port corresponds to and is connected with the liquid outlet one by one.

7. The battery pack according to claim 6, characterized in that: A plurality of cooling channels extending along the second direction are defined in the liquid cooling plate. The plurality of cooling channels are evenly arranged in the third direction. Two ends of the cooling channels are respectively connected to the liquid inlet and the liquid outlet.

8. The battery pack according to claim 7, characterized in that: The liquid inlet is located at the middle of the liquid cooling plate in the third direction.

9. The battery pack according to claim 6, characterized in that: The liquid inlet main pipe has a liquid inlet pipe portion, the liquid supply port is formed on the liquid inlet pipe portion, the liquid inlet pipe portion extends along the first direction and is arranged on one side of the plurality of battery packs close to the liquid inlet in the second direction, The liquid outlet main pipe has a liquid outlet pipe portion, the liquid collecting port is formed on the liquid outlet pipe portion, the liquid outlet pipe portion extends along the first direction and is arranged on one side of the plurality of battery packs close to the liquid outlet in the second direction, In the third direction, the liquid inlet pipe portion and the liquid outlet pipe portion do not exceed the plurality of battery packs.

10. The battery pack according to claim 1, characterized in that: An insulating layer is formed on the bottom wall of the box body, and the battery pack is supported on the insulating layer.

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