Battery pack and electric automobile

Abstract

The utility model discloses a battery pack, which comprises a single battery comprising a first pole and a second pole which are arranged at an interval, and the first pole and the second pole are positioned at the same end of the single battery; the first bus piece is connected to the first pole; the second confluence piece is connected to the second pole, and a gap is formed between the first confluence piece and the second confluence piece; and the liquid cooling plate is arranged in the gap, and at least one of the first confluence piece, the second confluence piece and the single battery is connected with the liquid cooling plate. The battery pack disclosed by the utility model can have relatively high volume energy density.

Description

Technical Field

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

[0002] In the related art, a battery pack has multiple single cells. In order to effectively prevent the problem of excessive heat in the single cells and thus reduce the performance of the single cells, a cooling plate is usually set in the battery pack to cool the single cells. The cooling plate can contact the single cells in the following ways: the cooling plate contacts the large surface, side surface or bottom surface of the single cell, or the cooling plate contacts the pole of the single cell.

[0003] Furthermore, the specific way of contacting the cooling plate with the pole of the single battery is that the cooling plate is arranged on the upper surface of the busbar, and the busbar is connected to the pole. Among them, the arrangement of the cooling plate above the busbar will increase the height of the battery pack, which will result in a lower volume energy density of the battery pack. Utility Model Content

[0004] 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 that can have a higher volume energy density.

[0005] The utility model also provides an electric car.

[0006] A battery pack according to the first embodiment of the present invention includes:

[0007] A single cell battery comprises a first pole and a second pole spaced apart from each other, wherein the first pole and the second pole are located at the same end of the single cell battery;

[0008] A first busbar connected to the first pole;

[0009] A second busbar is connected to the second pole, and a gap is formed between the first busbar and the second busbar;

[0010] A liquid cooling plate is disposed in the gap, and at least one of the first busbar, the second busbar, and the single battery is connected to the liquid cooling plate.

[0011] The battery pack according to the embodiment of the utility model has at least the following beneficial effects: the first busbar is connected to the first pole, the second busbar is connected to the second pole, there is a gap between the first busbar and the second busbar, and the liquid cooling plate is arranged in the gap. In the prior art, the liquid cooling plate is arranged on the upper surface of the busbar, which results in a low volume energy density of the battery pack. In the present application, the liquid cooling plate is arranged in the gap. The method of arranging the liquid cooling plate in the gap can effectively avoid the problem of increasing the height of the battery pack, so the battery pack can have a higher volume energy density.

[0012] According to the battery pack of some embodiments of the present invention, the first busbar includes a first main body portion, a first middle portion, and a second main body portion, the two ends of the first middle portion are respectively connected to the first main body portion and the second main body portion, the first main body portion and the second main body portion are spaced apart in the vertical direction, and the first main body portion and the first pole are connected; the second busbar includes a third main body portion, a second middle portion, and a fourth main body portion, the two ends of the second middle portion are respectively connected to the third main body portion and the fourth main body portion, the third main body portion and the fourth main body portion are spaced apart in the vertical direction, and the third main body portion and the second pole are connected; wherein, the second main body portion, the first middle portion, the second middle portion, and the fourth main body portion jointly form a first placement groove, and the liquid cooling plate is arranged in the first placement groove.

[0013] According to the battery pack of some embodiments of the present invention, the second main body portion, the first middle portion, the second middle portion and the fourth main body portion are all connected to the liquid cooling plate.

[0014] In the battery pack according to some embodiments of the present invention, the thickness of the first body portion is greater than the thickness of the second body portion.

[0015] According to some embodiments of the battery pack of the present invention, the distance between the surface of the liquid cooling plate facing away from the single cell and the top surface of the single cell is L1, the distance between the surface of the first body portion facing away from the single cell and the top surface of the single cell is L2, and L2≥L1.

[0016] According to some embodiments of the battery pack of the present invention, the liquid cooling plate includes a first cooling part and a second cooling part, the second cooling part is connected to the first cooling part, and the second cooling part protrudes relative to the first cooling part along the thickness direction of the liquid cooling plate; the second main body part, the fourth main body part and the top surface of the single battery jointly form a second placement groove, the first cooling part is arranged in the first placement groove, and the second cooling part is arranged in the second placement groove.

[0017] According to some embodiments of the battery pack of the present invention, the second main body portion, the first middle portion, the second middle portion and the fourth main body portion are all connected to the first cooling portion, and the second main body portion, the fourth main body portion and the top surface of the single battery are all connected to the second cooling portion.

[0018] In the battery pack according to some embodiments of the present invention, the second body portion is connected to the top surface of the single battery, and the fourth body portion is connected to the top surface of the single battery.

[0019] According to some embodiments of the battery pack of the present invention, the second main body portion, the fourth main body portion and the top surface of the single battery together form a second placement groove; the battery pack also includes a boss, which is arranged in the second placement groove, and the two ends of the boss are respectively connected to the liquid cooling plate and the top surface of the single battery.

[0020] In the battery pack according to some embodiments of the present invention, the second main body portion, the fourth main body portion and the top surface of the single battery together form a second placement groove; the battery pack also includes a boss, the boss includes a main body portion and a protruding portion, the protruding portion is connected to the main body portion and protrudes relative to the main body portion, the second main body portion and the fourth main body portion are both connected to one end of the main body portion, the top surface of the single battery is connected to the other end of the main body portion, and the protruding portion abuts against the liquid cooling plate.

[0021] According to the battery pack of some embodiments of the present invention, the single cell further includes a pressure relief valve, and the pressure relief valve is arranged on a side of the single cell away from the first pole.

[0022] The electric vehicle according to the second embodiment of the utility model includes the battery pack in the first embodiment.

[0023] The electric vehicle according to the embodiment of the utility model has at least the following beneficial effects: since the volume energy density of the battery pack is relatively high, the electric vehicle having the battery pack has a better endurance.

[0024] 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

[0025] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0026] Figure 1 It is a schematic diagram of a liquid cooling plate and a single battery in a battery pack of the first embodiment of the utility model;

[0027] Figure 2 A schematic diagram of a battery pack according to a first embodiment of the present invention;

[0028] Figure 3 A schematic diagram of a battery pack according to a second embodiment of the present invention;

[0029] Figure 4 A schematic diagram of a battery pack according to a second embodiment of the present invention;

[0030] Figure 5 It is a schematic diagram of a liquid cooling plate and a single battery in a battery pack of a second embodiment of the utility model;

[0031] Figure 6 FIG. 1 is a schematic diagram of a battery pack according to a third embodiment of the present invention.

[0032] Reference numerals:

[0033] Battery pack 10, upper cover 11, box body 12, single battery 100, first pole 110, second pole 120, top surface 130, first bus 200, first main body 210, first middle part 220, second main body 230, second bus 300, third main body 310, second middle part 320, fourth main body 330, gap 400, first placement groove 500, second placement groove 600, liquid cooling plate 700, first cooling part 710, second cooling part 720, boss 800, main body 810, protrusion 820. DETAILED DESCRIPTION

[0034] 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 only used to explain the present invention, and cannot be understood as limiting the present invention.

[0035] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] In the description of the present utility model, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0037] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0038] In the description of the utility model, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" 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 representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0039] Please refer to Figures 1 to 6In some embodiments, the battery pack 10 includes: a single cell 100, a first busbar 200, a second busbar 300 and a liquid cooling plate 700. A flow channel is provided in the liquid cooling plate 700, and the flow channel can allow a heat exchange medium to flow, so that the liquid cooling plate 700 can achieve the effect of regulating the temperature of the single cell 100. The single cell 100 includes a first pole 110 and a second pole 120 that are spaced apart from each other, and the first pole 110 and the second pole 120 are located at the same end of the single cell 100. The first pole 110 can be a positive pole, and the second pole 120 can be a negative pole. The shape of the single cell 100 can be square, and the square single cell 100 includes two large faces that are opposite to each other, two side faces that are opposite to each other, and a top surface 130 and a bottom surface that are opposite to each other. Among them, the large surface specifically refers to the surface with the largest area in the single cell 100, the top surface 130 specifically refers to the surface of the single cell 100 close to the liquid cooling plate, the top surface 130 may also be the surface on the top cover, and the first pole 110 and the second pole 120 may be arranged on the top surface 130. The liquid cooling plate 700 regulates the temperature of the single cell 100, which can usually be that the liquid cooling plate 700 contacts the large surface of the single cell 100, or the liquid cooling plate 700 contacts the bottom surface of the single cell 100, or the liquid cooling plate 700 contacts the top surface 130 of the single cell 100. In this application, the liquid cooling plate 700 contacts the first pole 110 and the second pole 120 of the single cell 100, and the liquid cooling plate 700 contacts the top surface 130 of the single cell 100, that is, at least one of the first busbar 200, the second busbar 300 and the single cell 100 is connected to the liquid cooling plate 700. The specific way of connecting at least one of the first busbar 200, the second busbar 300 and the single cell 100 to the liquid cooling plate 700 can be direct connection or indirect connection. Taking the first busbar 200 connecting to the liquid cooling plate 7000 as an example, direct connection means that there is no other object between the first busbar 200 and the liquid cooling plate 700, and indirect connection means that there is thermal conductive glue or other substances between the first busbar 200 and the liquid cooling plate 700. The first busbar 200 is connected to the first pole 110, and the first busbar 200 can realize the series connection of the negative electrodes of two adjacent single cells 100. The second busbar 300 is connected to the second pole 120, and the second busbar 300 can realize the series connection of the positive electrodes of two adjacent single cells 100. Along the first direction, there is a gap 400 between the first busbar 200 and the second busbar 300. Specifically, in the first direction, the first busbar 200 and the second busbar 300 are two separate parts, and the gap 400 therein can be used to accommodate the liquid cooling plate 700. The liquid cooling plate 700 is disposed in the gap 400, and the liquid cooling plate 700 is used to adjust the temperature of the single battery 100, wherein the first direction is perpendicular to the length direction of the liquid cooling plate 700.The liquid cooling plate 700 is disposed in the gap 400, which specifically means that at least a portion of the liquid cooling plate 700 is lower than the surface of the first collector 200 and the second collector 300. In addition, the gap 400 in the present application may specifically refer to the first placement slot 500 and the second placement slot 600, which will be described below.

[0040] Specifically, the first busbar 200 is connected to the first pole 110, the second busbar 300 is connected to the second pole 120, a gap 400 is provided between the first busbar 200 and the second busbar 300, and the liquid cooling plate 700 is provided in the gap 400. In the prior art, the liquid cooling plate 700 is provided on the upper surface of the busbar, thus resulting in a low volume energy density of the battery pack 10, while in the present application, the liquid cooling plate 700 is provided in the gap 400, and the manner in which the liquid cooling plate 700 is provided in the gap 400 can effectively avoid the problem of increasing the height of the battery pack 10, and therefore, the battery pack 10 can have a high volume energy density.

[0041] The following further explains why, in the prior art, the liquid cooling plate 700 (also referred to as the cooling plate) disposed on the bus will increase the height of the battery pack 10. This is because after the liquid cooling plate 700 is disposed on the upper surface of the bus, the height of the battery pack 10 is the sum of the thickness of the case 12, the height of the single battery 100, the thickness of the bus, and the thickness of the liquid cooling plate 700. In the present application, the height of the battery pack 10 is the sum of the thickness of the case 12, the height of the single battery 100, the thickness of the first bus 200, and the thickness of a portion of the liquid cooling plate 700 (the thickness of another portion of the liquid cooling plate 700 is in the gap, and the thickness of this portion overlaps with the thickness of the first bus 200). Therefore, when the battery pack 10 of the present application is compared with the battery pack 10 in the prior art, when the number of single batteries 100 is the same, the height of the battery pack 10 of the present application is less than the height of the battery pack 10 in the prior art. In other words, assuming that the height of the battery pack 10 of the present application is equal to the height of the battery pack 10 in the prior art, the battery pack 10 of the present application can accommodate more single cells 100 .

[0042] The first direction may be the length direction of the single battery 100, or the width direction of the liquid cooling plate 700. It is conceivable that the battery pack 10 has a plurality of single batteries 100, and the plurality of single batteries 100 are arranged along the length direction of the liquid cooling plate 700, and a portion of the liquid cooling plate 700 may be disposed in each gap 400.

[0043] It should be added that, in the present application, after the liquid cooling plate 700 contacts the first busbar 200 and the second busbar 300, the heat of the single cell 100 can be transferred to the liquid cooling plate 700 through the first pole 110, the second pole 120, the first busbar 200 and the second busbar 300, thereby achieving heat exchange. After the liquid cooling plate 700 contacts the top surface 130 of the single cell 100, the heat of the single cell 100 can be transferred to the liquid cooling plate 700 through the shell (top surface 130) of the single cell 100, thereby achieving heat exchange.

[0044] For further information, please refer to Figure 2 In some embodiments, the first busbar 200 includes a first body portion 210, a first middle portion 220, and a second body portion 230, wherein the two ends of the first middle portion 220 are respectively connected to the first body portion 210 and the second body portion 230, and the first body portion 210 and the second body portion 230 are arranged at intervals in the vertical direction. The first body portion 210 is connected to the first pole 110. The first busbar 200 may be in a "Z" shape, wherein the two ends of the first middle portion 220 may be respectively vertically connected to the first body portion 210 and the second body portion 230, and the vertical connection may facilitate the manufacture of the first busbar 200 and the subsequent placement of the liquid cooling plate 700 in the first placement groove 500. The connection between the first body portion 210 and the first pole 110 may also be specifically the connection between the first body portion 210 and the first pole 110 of two adjacent single cells 100. The second busbar 300 includes a third body part 310, a second middle part 320 and a fourth body part 330, and the two ends of the second middle part 320 are respectively connected to the third body part 310 and the fourth body part 330, and the third body part 310 and the fourth body part 330 are arranged at intervals in the vertical direction. The third body part 310 is connected to the second pole 120. The second busbar 300 can be in a "Z" shape, wherein the two ends of the second middle part 320 can be respectively vertically connected to the third body part 310 and the fourth body part 330, and the vertical connection can facilitate the manufacture of the second busbar 300 and the subsequent placement of the liquid cooling plate 700 in the first placement groove 500. The connection between the third body part 310 and the second pole 120 can also be specifically the connection between the third body part 310 and the second pole 120 of two adjacent single cells 100. The second body part 230, the first middle part 220, the second middle part 320 and the fourth body part 330 together form a first placement groove 500, and the liquid cooling plate 700 is disposed in the first placement groove 500. Specifically, after the liquid cooling plate 700 is placed in the first placement groove 500, compared with the method of placing the liquid cooling plate 700 on the upper surface of the first body part 210 or the upper surface of the second body part 230, the liquid cooling plate 700 is placed in the first placement groove 500, which can effectively achieve that the height of the single battery 100 remains unchanged under the premise that the height of the box body 12 of the battery pack 10 remains unchanged, which can make the battery pack 10 have a higher volume energy density.

[0045] In some embodiments, after the plurality of single cells 100 are arranged along the length direction of the liquid cooling plate 700 , the plurality of first placement grooves 500 may form a larger groove, which may accommodate the entire liquid cooling plate 700 .

[0046] After the liquid cooling plate 700 is arranged in the first placement groove 500, the liquid cooling plate 700 contacts the groove wall of the first placement groove 500 in the following ways: the first situation is that the liquid cooling plate 700 contacts the second body part 230 and the fourth body part 330; the second situation is that the liquid cooling plate 700 contacts the second body part 230, the first middle part 220, the second middle part 320 and the fourth body part 330. In the second situation, the contact area between the liquid cooling plate 700 and the first conduit 200 and the second conduit 300 is larger, so that the heat transfer effect between the liquid cooling plate 700 and the first conduit 200 and the second conduit 300 is better. Therefore, in some embodiments, the second body part 230, the first middle part 220, the second middle part 320 and the fourth body part 330 are all connected to the liquid cooling plate 700. More specifically, the liquid cooling plates 700 are connected to the upper surface of the second body portion 230, the side surface of the first middle portion 220, the side surface of the second middle portion 320, and the upper surface of the fourth body portion 330. In addition, after the liquid cooling plates 700 contact the first busbar 200 and the second busbar 300, the heat of the liquid cooling plates 700 can be indirectly transferred to the single cell 100, thereby adjusting the temperature of the single cell 100. It should be noted that in the present application, other liquid cooling plates 700 can also contact the large surface and bottom surface of the single cell 100, so that the single cell 100 can effectively avoid the problem of thermal runaway.

[0047] Further, in some embodiments, the thickness of the first body portion 210 is greater than the thickness of the second body portion 230. The shapes of the first body portion 210 and the second body portion 230 are both rectangular. Wherein, under the premise that the first confluence member 200 meets the requirements of flow capacity and heat transfer capacity, the thickness of the first body portion 210 can be made greater than the thickness of the second body portion 230, which can increase the volume of the first placement groove 500, thereby increasing the volume of the liquid cooling plate 700, so that the liquid cooling plate 700 has a better effect of regulating the temperature.

[0048] It is conceivable that, in some embodiments, the thickness of the third body portion 310 is greater than the thickness of the fourth body portion 330. The third body portion 310 and the fourth body portion 330 are both rectangular in shape. Wherein, on the premise that the second flow collector 300 meets the requirements of flow capacity and heat transfer capacity, the thickness of the third body portion 310 can be made greater than the thickness of the fourth body portion 330, which can increase the volume of the first placement groove 500, thereby increasing the volume of the liquid cooling plate 700, so that the liquid cooling plate 700 has a better effect of regulating the temperature.

[0049] For further information, please refer to Figure 2 In some embodiments, the distance between the surface of the liquid cooling plate 700 facing away from the single battery 100 and the top surface 130 of the single battery 100 is L1, and the distance between the surface of the first body part 210 facing away from the single battery 100 and the top surface 130 of the single battery 100 is L2, and L2≥L1. Specifically, when the first busbar 200 is set in a "Z" shape, the second body part 230, the first middle part 220, the second middle part 320 and the fourth body part 330 jointly form a first placement groove 500, and the space of the first placement groove 500 is used to place the liquid cooling plate 700. When L2≥L1, it can be imagined that the liquid cooling plate 700 will not protrude from the first placement groove 500, and the liquid cooling plate 700 can make full use of the space of the first placement groove 500 without additionally increasing the thickness, thereby resulting in the need to reduce the height of the single battery 100. It should be added that, in some other embodiments, the liquid cooling plate 700 may protrude from the first placement groove 500 . In this case, the liquid cooling plate 700 may support the upper cover 11 of the battery pack 10 .

[0050] For further information, please refer to Figure 2 In some embodiments, the liquid cooling plate 700 includes a first cooling part 710 and a second cooling part 720. The second cooling part 720 is connected to the first cooling part 710, and the second cooling part 720 protrudes relative to the first cooling part 710 along the thickness direction of the liquid cooling plate 700. The second body part 230, the fourth body part 330 and the top surface 130 of the single battery 100 together form a second placement groove 600, the first cooling part 710 is arranged in the first placement groove 500, and the second cooling part 720 is arranged in the second placement groove 600. Specifically, the design of the second cooling part 720 can further increase the volume of the liquid cooling plate 700. It can be imagined that the larger the volume of the liquid cooling plate 700, the more cooling medium can be accommodated, that is, more cooling medium can flow in the liquid cooling plate 700, which can improve the effect of the liquid cooling plate 700 in regulating the temperature of the single battery 100. In addition, the number of flow channels in the first cooling part 710 can be equal to the number of flow channels in the second cooling part 720, which can be flexibly set according to actual conditions.

[0051] Furthermore, when the first cooling part 710 is arranged in the first placement groove 500 and the second cooling part 720 is arranged in the second placement groove 600, the first cooling part 710 can contact the bottom wall of the first placement groove 500 (that is, the first cooling part 710 contacts the second main body part 230 and the fourth main body part 330), and the first cooling part 710 can also contact the bottom wall and side wall of the first placement groove 500 (that is, the first cooling part 710 contacts the first middle part 220, the second middle part 320, the second main body part 230 and the fourth main body part 330), wherein the latter method can make the contact area between the liquid cooling plate 700 and the first collector 200 and the second collector 300 larger, thereby having a better temperature regulation effect. The second cooling part 720 can contact the bottom wall of the second placement groove 600 (i.e., the second cooling part 720 contacts the top surface 130 of the single battery 100), and the second cooling part 720 can also contact the bottom wall and side wall of the second placement groove 600 (i.e., the second cooling part 720 contacts the top surface 130 of the single battery 100, the second body part 230 and the fourth body part 330), wherein the latter method can make the contact area between the liquid cooling plate 700 and the first busbar 200 and the second busbar 300 larger, thereby having a better temperature regulation effect. Therefore, specifically, in some embodiments, the first middle part 220, the second middle part 320, the second body part 230 and the fourth body part 330 are all connected to the first cooling part 710, and the top surface 130 of the single battery 100, the second body part 230 and the fourth body part 330 are all connected to the second cooling part 720. It should be supplemented that after the second cooling unit 720 is connected to the top surface 130 of the single battery 100 , the pressure of the liquid cooling plate 700 on the first pole 110 and the second pole 120 can be reduced.

[0052] Furthermore, when the single cell 100 is in thermal runaway, the pressure in the single cell 100 needs to be discharged through the pressure relief valve, so as to effectively avoid the explosion of the single cell 100. In the prior art, the pressure relief valve is generally arranged on the top surface 130 of the single cell 100, while in the present application, the pressure relief valve is arranged on the side of the single cell 100 away from the first pole 110. That is, the pressure relief valve is arranged at the bottom of the single cell 100 (the bottom depends on the vertical placement of the single cell 100, for example, the first pole 110 faces upward, that is, the single cell 100 is placed vertically). Specifically, in some embodiments, the single cell 100 further includes a pressure relief valve, which is arranged on the side of the single cell 100 away from the first pole 110. Among them, the top surface 130 of the single cell 100 can contact the liquid cooling plate 700, so that the liquid cooling plate 700 adjusts the temperature of the single cell 100. After the pressure relief valve is arranged on the bottom surface of the single battery 100, the liquid cooling plate 700 and the pressure relief valve can be prevented from affecting each other.

[0053] Furthermore, in addition to the above-mentioned methods, the first placement groove 500 also has other methods. Specifically, in some embodiments, the first pole 110, the second pole 120 and the top surface 130 of the single cell 100 together form the first placement groove 500, and the liquid cooling plate 700 is insulated and arranged in the first placement groove 500. The first pole 110 and the second pole 120 are arranged in the first direction, and the space there can be used to place the liquid cooling plate 700. Compared with the method in which the liquid cooling plate 700 is arranged on the upper surface of the bus, after the liquid cooling plate 700 is placed in the first placement groove 500, the height of the single cell 100 does not need to be reduced, which can effectively avoid the low volume energy density of the battery pack 10. There are two specific situations for the insulation setting. In one case, the material of the liquid cooling plate 700 is a non-metallic material, such as a plastic material, which can effectively avoid the short circuit between the liquid cooling plate 700 and the first pole 110, the second pole 120 and the single cell 100. In another case, there is an insulating member between the liquid cooling plate 700 and the first pole 110, the second pole 120 and the top surface 130 of the single battery 100. For example, the insulating member can be a silicone pad, which can effectively prevent the liquid cooling plate 700 from short-circuiting with the first pole 110, the second pole 120 and the single battery 100.

[0054] After the liquid cooling plate 700 is arranged in the first placement groove 500, the liquid cooling plate 700 contacts the groove wall of the first placement groove 500 in the following situations: the first situation is that the liquid cooling plate 700 contacts the top surface 130 of the single battery 100; the second situation is that the liquid cooling plate 700 contacts the top surface 130 of the single battery 100, the first pole 110 and the second pole 120. In the second situation, the liquid cooling plate 700 contacts the top surface 130 of the single battery 100, and the liquid cooling plate 700 contacts the first pole 110 and the second pole 120, and the liquid cooling plate 700 has more contact area, so that the liquid cooling plate 700 has a better effect of regulating the temperature of the single battery 100. Therefore, in some embodiments, the liquid cooling plate 700 is connected to the top surface 130 of the single battery 100, and the liquid cooling plate 700 contacts the first pole 110 and the second pole 120.

[0055] Further, in some embodiments, the second body portion 230 and the fourth body portion 330 are connected to the top surface 130 of the single cell 100. Specifically, the single cell 100 supports the second body portion 230 and the fourth body portion 330, thereby further the first bus 200 and the second bus 300 can support the liquid cooling plate 700. The self-weight of the liquid cooling plate 700 and the external force it receives are transmitted to the single cell 100 through the second body portion 230 and the fourth body portion 330, which can reduce the force on the first pole 110 and the second pole 120, and effectively prevent the first pole 110 and the second pole 120 from being damaged.

[0056] Further, in some embodiments, an insulating member is provided between the groove wall of the first placement groove 500 and the liquid cooling plate 700. When the liquid cooling plate 700 is made of metal, the insulating member can play an insulating role, thereby effectively preventing the liquid cooling plate 700 from connecting the first bus 200 and the second bus 300, resulting in a short circuit. In addition, in another embodiment, the material of the liquid cooling plate 700 can be a non-metallic material, such as a plastic material. This can also effectively prevent the first bus 200 and the second bus 300 from short-circuiting. It is conceivable that an insulating member is also provided between the groove wall of the second placement groove 600 and the liquid cooling plate 700.

[0057] Further, in some embodiments, the battery pack 10 further includes a glue layer, which is disposed between the groove wall of the first placement groove 500 and the liquid cooling plate 700, and the glue layer may be a thermally conductive glue, a thermally conductive gel, a thermally conductive structural glue, or a structural glue. The glue layer may fill the air gap between the liquid cooling plate 700 and the groove wall of the first placement groove 500, thereby improving the efficiency of heat conduction. It is conceivable that the glue layer may also be disposed between the groove wall of the second placement groove 600 and the liquid cooling plate 700.

[0058] For further information, please refer to Figure 3 In some embodiments, the second body portion 230, the fourth body portion 330 and the top surface 130 of the single cell 100 together form a second placement groove 600. The battery pack 10 also includes a boss 800, which is disposed in the second placement groove 600, and the two ends of the boss 800 are respectively connected to the liquid cooling plate 700 and the top surface 130 of the single cell 100. Specifically, the boss 800 can play a role in supporting the liquid cooling plate 700. If there is no boss 800, when the liquid cooling plate 700 is pressed on the first bus 200 and the second bus 300, the gravity of the liquid cooling plate 700 may cause the welding point between the first bus 200 and the first pole 110 to fail, and the welding point between the second bus 300 and the second pole 120 to fail. In addition, in some embodiments, the boss 800 can be an integrated structure with the top cover of the single cell 100.

[0059] For further information, please refer to Figure 4In some embodiments, the second body part 230, the fourth body part 330 and the top surface 130 of the single battery 100 jointly form a second placement groove 600. The battery pack 10 also includes a boss 800, the boss 800 includes a main body 810 and a protrusion 820, the protrusion 820 is connected to the main body 810 and protrudes relative to the main body 810, the second body part 230 and the fourth body part 330 are both connected to one end of the main body 810, the top surface 130 of the single battery 100 is connected to the other end of the main body 810, and the protrusion 820 abuts against the liquid cooling plate 700. Specifically, after the second body part 230 and the fourth body part 330 abut on the main body part 810, the main body part 810 can play a role in supporting the second body part 230 and the fourth body part 330, thereby effectively avoiding the failure of the welding point between the first bus 200 and the first pole 110, and the failure of the welding point between the second bus 300 and the second pole 120. In addition, after the protrusion 820 abuts against the liquid cooling plate 700 , the boss 800 can also play a role in supporting the liquid cooling plate 700 , which can reduce the gravity exerted by the liquid cooling plate 700 on the first busbar 200 and the second busbar 300 .

[0060] For further information, please refer to Figure 6 In some embodiments, the battery pack 10 includes an upper cover 11 and a box 12, and the single battery 100 and the liquid cooling plate 700 are both arranged in the box 12. The upper cover 11 can be connected to the liquid cooling plate 700, so that the heat of the liquid cooling plate 700 can be transferred to the upper cover 11, and the heat is further transferred through the upper cover 11. It is conceivable that a cooling device can be arranged above the upper cover 11 to indirectly improve the temperature regulation effect of the liquid cooling plate 700 on the single battery 100.

[0061] In some embodiments, an electric vehicle includes the battery pack 10 in the above embodiment. Since the volume energy density of the battery pack 10 is relatively high, the electric vehicle having the battery pack 10 has a relatively good endurance.

[0062] The embodiments of the utility model are described in detail above in conjunction with the accompanying drawings, but the utility model is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the utility model. In addition, the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

Claims

1. A battery pack, characterized in that: include: A single cell battery comprises a first pole and a second pole spaced apart from each other, wherein the first pole and the second pole are located at the same end of the single cell battery; A first busbar connected to the first pole; A second busbar is connected to the second pole, and a gap is formed between the first busbar and the second busbar; A liquid cooling plate is disposed in the gap, and at least one of the first busbar, the second busbar, and the single battery is connected to the liquid cooling plate.

2. The battery pack according to claim 1, characterized in that: The first busbar includes a first main body, a first middle part and a second main body, two ends of the first middle part are respectively connected to the first main body and the second main body, the first main body and the second main body are spaced apart in the vertical direction, and the first main body is connected to the first pole; the second busbar includes a third main body, a second middle part and a fourth main body, two ends of the second middle part are respectively connected to the third main body and the fourth main body, the third main body and the fourth main body are spaced apart in the vertical direction, and the third main body is connected to the second pole; wherein, the second main body, the first middle part, the second middle part and the fourth main body jointly form a first placement groove, and the liquid cooling plate is arranged in the first placement groove.

3. The battery pack according to claim 2, characterized in that: The second body portion, the first middle portion, the second middle portion and the fourth body portion are all connected to the liquid cooling plate.

4. The battery pack according to claim 2, characterized in that: The thickness of the first body portion is greater than the thickness of the second body portion.

5. The battery pack according to claim 2, characterized in that: The distance between the surface of the liquid cooling plate facing away from the single cell and the top surface of the single cell is L1, the distance between the surface of the first body portion facing away from the single cell and the top surface of the single cell is L2, and L2≥L1.

6. The battery pack according to claim 2, characterized in that: The liquid cooling plate includes a first cooling part and a second cooling part, the second cooling part is connected to the first cooling part, and the second cooling part protrudes relative to the first cooling part along the thickness direction of the liquid cooling plate; the second main body part, the fourth main body part and the top surface of the single battery jointly form a second placement groove, the first cooling part is arranged in the first placement groove, and the second cooling part is arranged in the second placement groove.

7. The battery pack according to claim 6, characterized in that: The second main body, the first middle part, the second middle part and the fourth main body are all connected to the first cooling part, and the second main body, the fourth main body and the top surface of the single battery are all connected to the second cooling part.

8. The battery pack according to claim 2, characterized in that: The second body portion is connected to the top surface of the single battery, and the fourth body portion is connected to the top surface of the single battery.

9. The battery pack according to claim 2, characterized in that: The second main body, the fourth main body and the top surface of the single cell together form a second placement groove; the battery pack also includes a boss, which is arranged in the second placement groove, and the two ends of the boss are respectively connected to the liquid cooling plate and the top surface of the single cell.

10. The battery pack according to claim 2, characterized in that: The second main body portion, the fourth main body portion and the top surface of the single battery together form a second placement groove; the battery pack also includes a boss, the boss includes a main body portion and a protruding portion, the protruding portion is connected to the main body portion and protrudes relative to the main body portion, the second main body portion and the fourth main body portion are both connected to one end of the main body portion, the top surface of the single battery is connected to the other end of the main body portion, and the protruding portion abuts against the liquid cooling plate.

11. The battery pack according to claim 1, characterized in that: The single cell further includes a pressure relief valve, which is arranged on a side of the single cell away from the first pole.

12. An electric vehicle, characterized in that: A battery pack comprising the battery pack as claimed in any one of claims 1 to 11.

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