Battery pack and electric device

Abstract

The present disclosure relates to the technical field of batteries, and discloses a battery pack and a power utilization device. The battery pack comprises a battery cell, a connecting water pipe, a first cold plate and a second cold plate. The battery cell comprises at least one single battery. The first cold plate and the second cold plate are arranged on opposite sides of the battery cell in a first direction. The first cold plate comprises a first body part and a first water nozzle connected to each other. The second cold plate comprises a second body part and a second water nozzle connected to each other. The first water nozzle and the second water nozzle are located between the first body part and the second body part. The connecting water pipe comprises a first end and a second end arranged oppositely in the first direction. At least part of the first water nozzle is inserted into the first end, and at least part of the second water nozzle is inserted into the second end. The length of the connecting water pipe is L1, the length of the side of the battery cell close to the connecting water pipe along the first direction is L2, and the ratio of L1 to L2 is greater than or equal to 0.2 and less than or equal to 1. The battery pack has relatively low noise.

Description

Technical Field

[0001] This disclosure relates to the field of battery technology, and more specifically, to a battery pack and an electrical device. Background Technology

[0002] Currently, in order to achieve better cooling effect, cold plates are installed on both sides of the battery pack, and adjacent cold plates need to be connected by water pipes. However, the installation of the water pipes is rather arbitrary, which can easily lead to large changes in the flow velocity of the heat exchange medium and high noise. In particular, for the water nozzles into which the heat exchange medium flows, the flow of the heat exchange medium will also scour the pipe walls of the nozzles, causing wear on the nozzles. After long-term use, the vibration will also be severe, further increasing the noise.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0004] The purpose of this disclosure is to overcome the shortcomings of the aforementioned related technologies and to provide a battery pack and power supply device.

[0005] According to one aspect of this disclosure, a battery pack is provided, comprising: A battery cell, comprising at least one single cell; The first cold plate and the second cold plate are respectively disposed on opposite sides of the battery cell in a first direction. The first cold plate includes a first body part and a first water nozzle connected to each other. The second cold plate includes a second body part and a second water nozzle connected to each other. The first water nozzle and the second water nozzle are located between the first body part and the second body part. A water pipe includes a first end and a second end disposed opposite to each other in the first direction, at least a portion of the first water nozzle is inserted into the first end, at least a portion of the second water nozzle is inserted into the second end, the length of the water pipe is L1, the length of the side of the battery unit near the water pipe along the first direction is L2, and the ratio of L1 to L2 is greater than or equal to 0.2 and less than or equal to 1.

[0006] The battery pack disclosed herein has a ratio of L1 to L2 greater than or equal to 0.2 and less than or equal to 1, which not only makes the installation of the connecting water pipe easier, but also allows the water flow to vary from fast to slow over a longer distance. This enables the water flow to slow down sufficiently within the connecting water pipe, reducing the scouring of the pipe wall of the first or second water nozzle and reducing wear on the first or second water nozzle. Even after prolonged use, vibration and noise will not be severe.

[0007] According to another aspect of this disclosure, an electrical device is provided, including the battery pack described above.

[0008] The electrical device disclosed herein makes the installation of the water pipe easier; it also allows the water flow to vary in speed over a longer distance, enabling the water flow to slow down sufficiently within the water pipe, reducing scouring of the pipe wall of the first or second water nozzle and reducing wear on the first or second water nozzle; even after prolonged use, vibration and noise will not be severe; thus reducing the vibration and noise of the electrical device.

[0009] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0010] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0011] Figure 1 This is a schematic diagram of an example embodiment of the battery pack disclosed herein.

[0012] Figure 2 This is a schematic diagram of another example embodiment of the battery pack disclosed herein.

[0013] Figure 3 for Figure 1 A cross-sectional view of the battery pack as seen from the side connected to the water pipe.

[0014] Figure 4 This is a schematic diagram of the structure after the water pipe is tilted.

[0015] Figure 5 for Figure 1 A schematic diagram of the structure of the connecting water pipe in the battery pack after tilting.

[0016] Figure 6 for Figure 3 A schematic diagram of the tilted structure of the connecting water pipe in the battery pack.

[0017] Explanation of reference numerals in the attached figures: 1. Battery unit; 1L, battery row; 1L1, single cell; 1L11, first large surface; 1L12, second large surface; 1L13, third side; 1L14, fourth side; 1L15, bottom plate; 1L16, cover plate; 2. First cold plate; 21. First body section; 22. First water nozzle; 3. Second cold plate; 31. Second body section; 32. Second water nozzle; 4. Connect the water pipe; 41. First end; 42. Second end; 43. Middle section; 5. Support plate; X, the first direction; Y, the second direction. Detailed Implementation

[0018] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore detailed descriptions of them will be omitted. Furthermore, the drawings are merely illustrative of this disclosure and are not necessarily drawn to scale.

[0019] Although relative terms such as "up" and "down" are used in this specification to describe the relative relationship of one component of an icon to another, these terms are used only for convenience, such as according to the orientation of the examples shown in the accompanying drawings. It is understood that if the device of the icon is flipped upside down, the component described as "up" will become the component described as "down." When a structure is "up" of another structure, it may mean that the structure is integrally formed on the other structure, or that the structure is "directly" mounted on the other structure, or that the structure is "indirectly" mounted on the other structure through another structure.

[0020] The terms “a,” “one,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended inclusion and to mean that there may be other elements / components / etc. in addition to the listed elements / components / etc.; the terms “first,” “second,” and “third,” etc., are used only as markers and are not a limitation on the number of objects.

[0021] In this application, unless otherwise expressly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium. "And / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Furthermore, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0022] This disclosure provides an exemplary embodiment of a battery pack, with reference to... Figures 1-6 As shown, the battery pack may include a battery cell 1, a connecting water pipe 4, a first cold plate 2, and a second cold plate 3. The battery cell 1 may include at least one single battery cell 1L1. The first cold plate 2 and the second cold plate 3 are respectively disposed on opposite sides of the battery cell 1 in the first direction X. The first cold plate 2 may include a first body part 21 and a first water nozzle 22 connected to each other. The second cold plate 3 may include a second body part 31 and a second water nozzle 32 connected to each other. The first water nozzle 22 and the second water nozzle 32 are located between the first body part 21 and the second body part 31. The connecting water pipe 4 may include a first end 41 and a second end 42 disposed opposite to each other in the first direction X. At least a portion of the first water nozzle 22 is inserted into the first end 41, and at least a portion of the second water nozzle 32 is inserted into the second end 42. The length of the connecting water pipe 4 is L1. The length of the side of the battery cell 1 near the connecting water pipe 4 along the first direction X is L2. The ratio of L1 to L2 is greater than or equal to 0.2 and less than or equal to 1.

[0023] The battery pack disclosed herein not only makes the installation of the connecting water pipe 4 easier, but also allows the water flow to vary in speed over a longer distance, enabling the water flow to slow down sufficiently within the connecting water pipe 4, reducing the scouring of the pipe wall of the first water nozzle 22 or the second water nozzle 32, and reducing the wear of the first water nozzle 22 or the second water nozzle 32; even after long-term use, vibration and noise will not be severe.

[0024] In some exemplary embodiments of this disclosure, battery cell 1 may include at least one single cell 1L1; for example, battery cell 1 may include one single cell 1L1, or battery cell 1 may include two, three or more single cells 1L1.

[0025] Specifically, refer to Figure 1 and Figure 2 As shown, battery cell 1 may include at least one column of battery cells 1L. For example, battery cell 1 may include one column of battery cells 1L, or battery cell 1 may include two, three or more columns of battery cells 1L.

[0026] The battery array 1L may include at least two individual cells 1L1 arranged along the second direction Y. For example, the battery array 1L may include two individual cells 1L1 arranged along the second direction Y, or the battery array 1L may include three or more individual cells 1L1 arranged along the second direction Y.

[0027] The single cell 1L1 can be configured as a cuboid structure, giving it two large surfaces (first large surface 1L11 and second large surface 1L12) arranged opposite each other, and four side surfaces connected end to end. The two large surfaces (first large surface 1L11 and second large surface 1L12) are connected to opposite sides of the four side surfaces. The large surfaces (first large surface 1L11 and second large surface 1L12) are the surfaces with the largest area of ​​the single cell 1L1.

[0028] Within the same 1L battery column, refer to Figure 1 As shown, the large surfaces of two adjacent individual cells 1L1 can be arranged close to each other, such that the large surface of the individual cell 1L1 is perpendicular to the second direction Y; refer to Figure 2 As shown, the sides of two adjacent individual cells 1L1 can also be arranged close to each other, so that the large surface of the individual cell 1L1 is parallel to the second direction Y.

[0029] In some exemplary embodiments of this disclosure, reference is made to Figure 1 and Figure 2 As shown, the first cold plate 2 and the second cold plate 3 are respectively disposed on opposite sides of the battery unit 1 in the first direction X, that is, the first cold plate 2 is disposed on one side of the battery unit 1 in the first direction X, and the second cold plate 3 is disposed on the other side of the battery unit 1 in the first direction X. The battery unit 1 can be cooled simultaneously by the first cold plate 2 and the second cold plate 3, which can achieve a better cooling effect.

[0030] Reference Figures 1-3 As shown, the first cold plate 2 may include a first body portion 21 and a first water nozzle 22 connected to each other; the second cold plate 3 may include a second body portion 31 and a second water nozzle 32 connected to each other. A heat exchange channel is provided in the first body portion 21, and a heat exchange channel is also provided in the second body portion 31. When the individual battery 1L1 needs to be heated, a higher temperature heat exchange medium can be introduced into the heat exchange channel, and the heat of the heat exchange medium is transferred to the individual battery 1L1, thereby heating the individual battery 1L1; when the individual battery 1L1 needs to be cooled, a lower temperature heat exchange medium can be introduced into the heat exchange channel, and the heat of the individual battery 1L1 is transferred to the heat exchange medium, thereby cooling the individual battery. The following explanation uses water as the heat exchange medium.

[0031] The first body portion 21 is attached to the battery cell 1 and is used to cool the battery cell 1. One end of the first body portion 21 along the second direction Y protrudes from the battery cell 1, and the protruding end of the first body portion 21 is connected to a first water nozzle 22. The first water nozzle 22 is connected to a heat exchange channel inside the first body portion 21, through which heat exchange medium can flow into the heat exchange channel inside the first body portion 21, and the heat exchange medium can also flow out through the first water nozzle 22.

[0032] The second body portion 31 is also attached to the battery unit 1 for cooling the battery unit 1. One end of the second body portion 31 protrudes from the battery unit 1 along the second direction Y, and the protruding end of the second body portion 31 is connected to the second water nozzle 32. The second water nozzle 32 is connected to the heat exchange channel inside the second body portion 31, through which heat exchange medium can flow into the heat exchange channel inside the second body portion 31, and the heat exchange medium can also flow out through the second water nozzle 32.

[0033] The first water nozzle 22 and the second water nozzle 32 are located between the first body portion 21 and the second body portion 31, that is, the first water nozzle 22 is connected to the side of the first body portion 21 near the second body portion 31, and the second water nozzle 32 is connected to the side of the second body portion 31 near the first body portion 21. The first water nozzle 22 extends along the first direction X, and the second water nozzle 32 also extends along the first direction X.

[0034] In some exemplary embodiments of this disclosure, reference is made to Figure 3 As shown, the connecting water pipe 4 extends along a first direction X, and has a first end 41 and a second end 42 disposed opposite to each other in the first direction X. At least a portion of the first water nozzle 22 is inserted into the first end 41; for example, either a portion of the first water nozzle 22 or the entire first water nozzle 22 is inserted into the first end 41. At least a portion of the second water nozzle 32 is inserted into the second end 42; for example, either a portion of the second water nozzle 32 or the entire second water nozzle 32 is inserted into the second end 42.

[0035] The connecting water pipe 4 also includes an intermediate section 43, which is connected between the first end 41 and the second end 42. The inner diameter of the intermediate section 43 is larger than the inner diameter of the first water nozzle 22, so that the flow velocity of water in the intermediate section 43 is less than the flow velocity in the first water nozzle 22.

[0036] The inner diameter of the middle section 43 is larger than the inner diameter of the second water nozzle 32, so that the flow velocity of water in the middle section 43 is less than the flow velocity in the second water nozzle 32.

[0037] As water flows sequentially through the first water nozzle 22, the intermediate section 43, and the second water nozzle 32, the water flow changes from fast to slow to fast. The water flow will scour the pipe wall of the second water nozzle 32, causing wear on the second water nozzle 32. After prolonged use, the vibration will also become severe, further increasing the noise.

[0038] When the water flows in the opposite direction, the water flow will scour the pipe wall of the first water nozzle 22, causing wear to the first water nozzle 22.

[0039] The length of the connecting water pipe 4 is L1, and the length of the side of the battery unit 1 near the connecting water pipe 4 along the first direction X is L2. That is, the distance between the side of the first body part 21 near the second cold plate 3 and the side of the second body part 31 near the first cold plate 2 is L2. The ratio of L1 to L2 is greater than or equal to 0.2 and less than or equal to 1. For example, the ratio of L1 to L2 can be 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, etc.

[0040] If the ratio of L1 to L2 is too small, resulting in a short length L1 of the connecting water pipe 4 and a long length L2 of the side of the battery unit 1 near the connecting water pipe 4 along the first direction X, the water flow will change from fast to slow to fast over a short distance, causing the water flow to be more turbulent and the pipe wall of the first water nozzle 22 or the second water nozzle 32 to be more severely eroded, resulting in more severe wear on the first water nozzle 22 or the second water nozzle 32. After long-term use, the vibration will also be severe, further increasing the noise.

[0041] If the ratio of L1 to L2 is too large, the length L1 of the connecting water pipe 4 will be too large, making the installation of the connecting water pipe 4 more difficult.

[0042] The above-mentioned numerical range not only makes the installation of the connecting water pipe 4 easier, but also allows the water flow to change from fast to slow over a long distance, so that the water flow can be slowed down sufficiently within the connecting water pipe 4, reducing the scouring of the pipe wall of the first water nozzle 22 or the second water nozzle 32 and reducing the wear of the first water nozzle 22 or the second water nozzle 32; even after long-term use, vibration and noise will not be serious.

[0043] Optionally, the length L1 of the connecting water pipe 4 is greater than or equal to 50 mm and less than or equal to 260 mm. For example, the length L1 of the connecting water pipe 4 can be 70 mm, 100 mm, 130 mm, 150 mm, 180 mm, 200 mm, 220 mm, 250 mm, etc.

[0044] The length L2 of the side of the battery unit 1 near the connecting water pipe 4 along the first direction X is greater than or equal to 60 mm and less than or equal to 280 mm. For example, the length L2 of the side of the battery unit 1 near the connecting water pipe 4 along the first direction X can be 70 mm, 100 mm, 130 mm, 150 mm, 180 mm, 200 mm, 220 mm, 250 mm, 270 mm, etc.

[0045] It should be noted that, referring to Figure 1 As shown, when a single cell 1L1 is disposed between the first cold plate 2 and the second cold plate 3 in the first direction X, L2 is the length of the single cell 1L1 along the first direction X on the side closest to the connecting water pipe 4. (Refer to...) Figure 2As shown, when two or more individual cells 1L1 are arranged between the first cold plate 2 and the second cold plate 3 in the first direction X, L2 is the sum of the lengths of the two or more individual cells 1L1 along the first direction X on the side closest to the connecting water pipe 4.

[0046] In some exemplary embodiments of this disclosure, reference is made to Figure 3 As shown, the distance between the first water tap 22 and the second water tap 32 along the first direction X is L3, that is, the spacing between the first water tap 22 and the second water tap 32 along the first direction X is L3; the ratio of L3 to L1 is greater than or equal to 0.1 and less than or equal to 0.8, that is, the ratio of the distance L3 between the first water tap 22 and the second water tap 32 along the first direction X to the length L1 of the connecting water pipe 4 is greater than or equal to 0.1 and less than or equal to 0.8. For example, the ratio of L3 to L1 can be 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, etc.

[0047] If the ratio of L3 to L1 is too small, the distance L3 between the first water nozzle 22 and the second water nozzle 32 along the first direction X will be too small, and the length L1 of the connecting water pipe 4 will be too large. This will cause the water flow to change from fast to slow to fast over a short distance, resulting in a more turbulent flow and more severe scouring of the pipe wall of the first water nozzle 22 or the second water nozzle 32, leading to more severe wear on the first water nozzle 22 or the second water nozzle 32. After long-term use, the vibration will also be severe, further increasing the noise. Moreover, the installation of the connecting water pipe 4 will be more difficult.

[0048] If the ratio of L3 to L1 is too large, the distance L3 between the first water tap 22 and the second water tap 32 along the first direction X will be too large, and the length L1 of the connecting water pipe 4 will be too small, resulting in the first water tap 22 and / or the second water tap 32 being inserted into the connecting water pipe 4 for too short a length. This will cause the connecting water pipe 4 to easily detach from the first water tap 22 and / or the second water tap 32, thus causing water leakage.

[0049] The aforementioned numerical range not only ensures that the connecting water pipe 4 is less likely to detach from the first water nozzle 22 and / or the second water nozzle 32, preventing leaks, but also makes the installation of the connecting water pipe 4 easier. Furthermore, it allows for rapid-slow-rapid changes in water flow over a longer distance, enabling sufficient deceleration of the water flow within the connecting water pipe 4, reducing erosion of the pipe walls of the first water nozzle 22 or the second water nozzle 32, and minimizing wear on the first water nozzle 22 or the second water nozzle 32. Even after prolonged use, vibration and noise will not be severe.

[0050] Optionally, the distance L3 between the first water tap 22 and the second water tap 32 along the first direction X is greater than or equal to 20 mm and less than or equal to 200 mm. For example, the distance L3 between the first water tap 22 and the second water tap 32 along the first direction X can be 50 mm, 70 mm, 100 mm, 130 mm, 150 mm, or 180 mm.

[0051] In some exemplary embodiments of this disclosure, reference is made to Figure 3 As shown, the central axis of the water pipe 4 is collinear with the central axis of the first water nozzle 22, and the central axis of the water pipe 4 is collinear with the central axis of the second water nozzle 32; this allows the water flow to follow a straight line as much as possible, reducing bends and thus reducing water flow noise; it also reduces the scouring of the pipe wall of the first water nozzle 22 or the second water nozzle 32, reducing the wear of the first water nozzle 22 or the second water nozzle 32; even after long-term use, vibration and noise will not be serious.

[0052] It should be noted that collinearity in this disclosure includes not only complete collinearity, but also collinearity with a certain margin of error. The margin of error varies depending on the equipment and preparation process. Therefore, collinearity is considered to be within the margin of error of the equipment and preparation process.

[0053] In some exemplary embodiments of this disclosure, reference is made to Figure 4 As shown, due to the manufacturing and installation errors of battery cell 1, as well as the manufacturing and installation errors of the first cold plate 2 and the second cold plate 3, the central axis of the connecting water pipe 4 intersects with the central axis of the first water nozzle 22 to form a first included angle J1, which is greater than 175° and less than or equal to 185°; it also causes the central axis of the connecting water pipe 4 to intersect with the central axis of the second water nozzle 32 to form a second included angle J2, which is greater than 175° and less than or equal to 185°.

[0054] For example, the first included angle J1 can be 177°, 179°, 182°, 184°, etc., and the second included angle J2 can be 177°, 179°, 182°, 184°, etc.

[0055] If the first included angle J1 is too small or too large, it will make it difficult or impossible to install the connecting water pipe 4, causing the water flow to need to bend and generate more noise; moreover, the scouring of the pipe wall of the first water nozzle 22 or the second water nozzle 32 will be more severe, resulting in more severe wear on the first water nozzle 22 or the second water nozzle 32; after long-term use, the vibration will also be severe, further increasing the noise.

[0056] Similarly, if the second included angle J2 is too small or too large, it will make it difficult or impossible to install the connecting water pipe 4, causing the water flow to need to make a large bend and generate more noise; moreover, the pipe wall of the first water nozzle 22 or the second water nozzle 32 will be more severely eroded, resulting in more severe wear on the first water nozzle 22 or the second water nozzle 32; after long-term use, the vibration will also be severe, further increasing the noise.

[0057] The above-mentioned numerical range makes the installation of the water pipe 4 easier, reduces the number of bends required in the water flow and generates less noise, and also reduces the scouring of the pipe wall of the first water nozzle 22 or the second water nozzle 32 and the wear of the first water nozzle 22 or the second water nozzle 32 is less; even after long-term use, the vibration and noise will not be serious.

[0058] It should be noted that the central axis of the connecting water pipe 4 refers to the central axis of the middle section 43 extending axially, the central axis of the first water tap 22 also refers to the central axis of the first water tap 22 extending axially, and the central axis of the second water tap 32 also refers to the central axis of the second water tap 32 extending axially.

[0059] In some exemplary embodiments of this disclosure, reference is made to Figure 3 As shown, the distance K1 between the end face of the first end 41 and the first body portion 21 is greater than or equal to 15 mm and less than or equal to 30 mm. For example, the distance K1 between the end face of the first end 41 and the first body portion 21 can be 18 mm, 20 mm, 22 mm, 25 mm, 27 mm, etc., so that the end face of the first end 41 is not in contact with the first body portion 21.

[0060] If the distance K1 between the end face of the first end 41 and the first body part 21 is too small, it will be difficult to install the water pipe 4.

[0061] If the distance K1 between the end face of the first end 41 and the first body part 21 is too large, the length of the first water nozzle 22 inserted into the connecting water pipe 4 may be too short, and the connecting water pipe 4 may easily fall off the first water nozzle 22, resulting in water leakage.

[0062] The above-mentioned numerical range not only makes the installation of the connecting water pipe 4 easier, but also ensures that the length of the first water nozzle 22 inserted into the connecting water pipe 4 is appropriate, so that the connecting water pipe 4 is not easy to fall off the first water nozzle 22 and there will be no leakage.

[0063] The distance K2 between the end face of the second end 42 and the second body portion 31 is greater than or equal to 15 mm and less than or equal to 30 mm. For example, the distance between the end face of the second end 42 and the second body portion 31 can be 18 mm, 20 mm, 22 mm, 25 mm, 27 mm, etc., so that the end face of the second end 42 is not in contact with the second body portion 31.

[0064] If the distance K2 between the end face of the second end 42 and the second body part 31 is too small, it will be difficult to install the water pipe 4.

[0065] If the distance K2 between the end face of the second end 42 and the second body part 31 is too large, the length of the second water nozzle 32 inserted into the connecting water pipe 4 may be too short, and the connecting water pipe 4 may easily fall off the second water nozzle 32, resulting in water leakage.

[0066] The above-mentioned numerical range not only makes the installation of the connecting water pipe 4 easier, but also ensures that the second water nozzle 32 is inserted into the connecting water pipe 4 at the appropriate length, so that the connecting water pipe 4 is not easy to fall off the second water nozzle 32 and there will be no leakage.

[0067] In some exemplary embodiments of this disclosure, reference is made to Figure 1 As shown, the absolute value of the difference in distance between the two ends of the connecting water pipe 4 and the side of the battery unit 1 near the connecting water pipe 4 is greater than or equal to 0 and less than or equal to 0.2 mm. This makes the difference in distance between the two ends of the connecting water pipe 4 and the side of the battery unit 1 near the connecting water pipe 4 very small. In other words, the central axis of the connecting water pipe 4 is basically parallel to the side of the battery unit 1 near the connecting water pipe 4. Specifically, the central axis of the first water nozzle 22 is basically parallel to the side of the battery unit 1 near the connecting water pipe 4, and the central axis of the second water nozzle 32 is also basically parallel to the side of the battery unit 1 near the connecting water pipe 4. Furthermore, the central axes of the first water nozzle 22 and the second water nozzle 32 are basically collinear. After installing the connecting water pipe 4, its central axis is parallel to the side of the battery unit 1 near the connecting water pipe 4. This arrangement ensures that the water flows in a straight line as much as possible, reducing bends and thus reducing water flow noise. It also reduces the scouring of the pipe walls of the first water nozzle 22 or the second water nozzle 32, reducing wear on the first water nozzle 22 or the second water nozzle 32. Even after prolonged use, vibration and noise will not be severe.

[0068] Of course, in some other exemplary embodiments of this disclosure, reference is made to Figure 5 As shown, due to manufacturing and installation errors of battery cell 1, as well as manufacturing and installation errors of the first cold plate 2 and the second cold plate 3, a third included angle J3 is formed between the central axis of the connecting water pipe 4 and the side of battery cell 1 closest to the connecting water pipe 4. The third included angle J3 is greater than 0 and less than or equal to 5°. For example, the third included angle J3 can be 1°, 2°, 3°, 4°, 5°, etc.

[0069] If the third included angle J3 is too large, it will make it difficult or impossible to install the connecting water pipe 4, causing the water flow to need to bend and generate more noise; moreover, it will cause more severe scouring of the pipe wall of the first water nozzle 22 or the second water nozzle 32, resulting in more severe wear on the first water nozzle 22 or the second water nozzle 32; after long-term use, the vibration will also be severe, further increasing the noise.

[0070] The above-mentioned numerical range makes the installation of the water pipe 4 easier, reduces the number of bends required in the water flow and generates less noise, and also reduces the scouring of the pipe wall of the first water nozzle 22 or the second water nozzle 32 and the wear of the first water nozzle 22 or the second water nozzle 32 is less; even after long-term use, the vibration and noise will not be serious.

[0071] It should be noted that the central axis of the connecting water pipe 4 refers to the central axis of the middle section 43 extending axially.

[0072] Optionally, refer to Figure 5 As shown, the minimum distance d between the connecting water pipe 4 and the side of the battery unit 1 closest to the connecting water pipe 4 is greater than or equal to 2 mm and less than or equal to 10 mm. For example, the minimum distance d between the connecting water pipe 4 and the side of the battery unit 1 closest to the connecting water pipe 4 can be 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, etc.

[0073] If the minimum distance d between the water pipe 4 and the side of the battery unit 1 closest to the water pipe 4 is too small, it will be difficult to install the water pipe 4.

[0074] If the minimum distance d between the water pipe 4 and the side of the battery unit 1 closest to the water pipe 4 is large, it will require a large space, which is not conducive to improving energy density.

[0075] The above-mentioned numerical range is not only beneficial for the installation of water pipe 4, but also does not require a large space and has virtually no impact on energy density.

[0076] In some exemplary embodiments of this disclosure, reference is made to Figure 3 As shown, the battery pack may include a support plate 5 for supporting the battery unit 1. The central axis of the connecting water pipe 4 is parallel to the support plate 5 of the battery pack; that is, the central axis of the first water nozzle 22 is parallel to the support plate 5 of the battery pack, the central axis of the second water nozzle 32 is parallel to the support plate 5 of the battery pack, and the central axes of the first water nozzle 22 and the second water nozzle 32 are collinear; after the connecting water pipe 4 is installed, its central axis is parallel to the support plate 5 of the battery pack. This arrangement allows the water flow to follow a straight line as much as possible, reducing bends and thus reducing water flow noise; it also reduces the scouring of the pipe wall of the first water nozzle 22 or the second water nozzle 32, reducing wear on the first water nozzle 22 or the second water nozzle 32; even after long-term use, vibration and noise will not be severe.

[0077] Of course, in some other exemplary embodiments of this disclosure, reference is made to Figure 6As shown, due to the manufacturing and installation errors of battery cell 1, as well as the manufacturing and installation errors of the first cold plate 2 and the second cold plate 3, a fourth included angle J4 is formed between the central axis of the connecting water pipe 4 and the support plate 5 of the battery pack. The fourth included angle J4 is greater than 0 and less than or equal to 5°. For example, the fourth included angle J4 can be 1°, 2°, 3°, 4°, 5°, etc.

[0078] If the fourth included angle J4 is too large, it will make it difficult or impossible to install the connecting water pipe 4, causing the water flow to need to bend and generate more noise; moreover, it will cause more severe scouring of the pipe wall of the first water nozzle 22 or the second water nozzle 32, resulting in more severe wear on the first water nozzle 22 or the second water nozzle 32; after long-term use, the vibration will also be severe, further increasing the noise.

[0079] The above-mentioned numerical range makes the installation of the water pipe 4 easier, reduces the number of bends required in the water flow and generates less noise, and also reduces the scouring of the pipe wall of the first water nozzle 22 or the second water nozzle 32 and the wear of the first water nozzle 22 or the second water nozzle 32 is less; even after long-term use, the vibration and noise will not be serious.

[0080] It should be noted that the central axis of the connecting water pipe 4 refers to the central axis of the middle section 43 extending axially.

[0081] In some exemplary embodiments of this disclosure, reference is made to Figure 2 As shown, the first large surface 1L11 is attached to the first body portion 21, and the second large surface 1L12 is attached to the second body portion 31. In this case, the distance between the first large surface 1L11 and the second large surface 1L12 is L2. This arrangement can provide better cooling for the single battery cell 1L1, which is more conducive to achieving fast charging. Alternatively, the distance between the first large surface 1L11 and the second large surface 1L12 can be two or more times L2.

[0082] In this case, the ratio of L1 to L2 is greater than or equal to 0.7 and less than or equal to 1. For example, the ratio of L1 to L2 can be 0.75, 0.8, 0.85, 0.9, 0.95, etc.

[0083] Specifically, the length L1 of the connecting water pipe 4 is greater than or equal to 60 mm and less than or equal to 75 mm. For example, the length L1 of the connecting water pipe 4 can be 63 mm, 65 mm, 68 mm, 70 mm, 72 mm, etc. The length L2 of the side of the battery unit 1 near the connecting water pipe 4 along the first direction X is greater than or equal to 62 mm and less than or equal to 90 mm. For example, the length L2 of the side of the battery unit 1 near the connecting water pipe 4 along the first direction X can be 63 mm, 65 mm, 68 mm, 70 mm, 72 mm, 75 mm, 77 mm, 80 mm, 83 mm, 85 mm, 88 mm, etc.

[0084] Of course, in some other exemplary embodiments of this disclosure, reference is made to Figure 1 As shown, the single cell 1L1 has a first large surface 1L11 and a second large surface 1L12 arranged opposite to each other, and a third side surface 1L13 and a fourth side surface 1L14 arranged opposite to each other. The third side surface 1L13 and the fourth side surface 1L14 are both connected between the first large surface 1L11 and the second large surface 1L12. The third side surface 1L13 is attached to the first body part 21, and the fourth side surface 1L14 is attached to the second body part 31. In this case, the distance between the third side surface 1L13 and the fourth side surface 1L14 is L2.

[0085] In this case, the ratio of L1 to L2 is greater than or equal to 0.8 and less than or equal to 1. For example, the ratio of L1 to L2 can be 0.85, 0.9, 0.95, etc.

[0086] Specifically, the length L1 of the connecting water pipe 4 is greater than or equal to 200 mm and less than or equal to 260 mm. For example, the length L1 of the connecting water pipe 4 can be 210 mm, 220 mm, 230 mm, 240 mm, 250 mm, etc. The length L2 of the side of the battery unit 1 near the connecting water pipe 4 along the first direction X is greater than or equal to 202 mm and less than or equal to 275 mm. For example, the length L2 of the side of the battery unit 1 near the connecting water pipe 4 along the first direction X can be 210 mm, 220 mm, 230 mm, 240 mm, 250 mm, 260 mm, 270 mm, etc.

[0087] In some exemplary embodiments of this disclosure, reference is made to Figure 3 As shown, a single cell 1L1 may include a base plate 1L15 and a cover plate 1L16 disposed opposite to each other. The base plate 1L15 is used to support the cell, that is, the base plate 1L15 is located at the bottom of the single cell 1L1.

[0088] The minimum distance between the connecting water pipe 4 and the cover plate 1L16 is less than the minimum distance between the connecting water pipe 4 and the base plate 1L15. This makes the minimum distance between the first water nozzle 22, the second water nozzle 32, and the connecting water pipe 4 and the cover plate 1L16 less than the minimum distance between them and the base plate 1L15. In other words, the first water nozzle 22, the second water nozzle 32, and the connecting water pipe 4 are positioned closer to the cover plate 1L16 than the base plate 1L15. This means that the first water nozzle 22, the second water nozzle 32, and the connecting water pipe 4 are located at the upper part of the single battery 1L1. This arrangement facilitates the installation of the connecting water pipe 4. Moreover, the cover plate 1L16 is generally provided with a terminal post, which can provide better heat dissipation for the terminal post.

[0089] Of course, in some other exemplary embodiments of this disclosure, the minimum distance between the connecting water pipe 4 and the base plate 1L15 may be less than the minimum distance between the connecting water pipe 4 and the cover plate 1L16, so that the minimum distance between the first water nozzle 22, the second water nozzle 32 and the connecting water pipe 4 and the base plate 1L15 is less than the minimum distance between them and the cover plate 1L16. That is, the first water nozzle 22, the second water nozzle 32 and the connecting water pipe 4 may be set closer to the base plate 1L15 than the cover plate 1L16. In other words, the first water nozzle 22, the second water nozzle 32 and the connecting water pipe 4 are located at the lower part of the single cell 1L1. With such a setting, the gravitational potential energy of the connecting water pipe 4 is small, which can reduce the downward fall of the connecting water pipe 4 and reduce the impact on the first cold plate 2 and the second cold plate 3. The connecting water pipe 4 is not easily damaged.

[0090] Alternatively, the distance between the connecting water pipe 4 and the base plate 1L15 can be equal to the distance between the connecting water pipe 4 and the cover plate 1L16, so that the distance between the first water nozzle 22, the second water nozzle 32, and the connecting water pipe 4 and the base plate 1L15 is equal to the distance between them and the cover plate 1L16. That is, the first water nozzle 22, the second water nozzle 32, and the connecting water pipe 4 are located in the middle of the single cell 1L1; such a setting makes the heat exchange uniformity better.

[0091] Based on the same inventive concept, the present disclosure provides an example embodiment of an electrical device that includes a battery pack as described in any of the above-mentioned claims. The specific structure of the battery pack has been described in detail above, and therefore will not be repeated here.

[0092] Electrical devices can be transportation equipment such as electric vehicles and electric ships, as well as electric engineering vehicles, field exploration equipment, and energy storage systems.

[0093] A single cell is a battery. A battery can store chemical energy and controllably convert chemical energy into electrical energy. In a recyclable battery, the active materials can be reactivated by charging after discharge so that it can continue to be used. A battery includes a casing and a cell housed inside the casing.

[0094] A battery pack is formed by connecting multiple battery cells with similar capacity and internal resistance in series or parallel.

[0095] The battery pack includes a battery management system (BMS), a thermal management system, an electrical connection system (high-voltage / low-voltage connectors, wiring harnesses, etc.), structural components (shell, brackets, etc.), and protective components, etc., and the above components are placed in a box and sealed with a cover plate to form a complete functional unit that can directly output electrical energy.

[0096] A battery pack, as a type of rechargeable battery, is the power source for new energy vehicles. A battery pack generally includes cell modules, a battery management system (BMS) control module, and a housing that contains the cell modules and the BMS control module.

[0097] The battery pack includes a housing and multiple individual batteries housed within the housing. The housing is divided into upper and lower sections, which are sealed together. The battery pack includes at least two battery cells, a BMS control assembly, and a casing.

[0098] A battery pack typically consists of a battery box and battery modules. The battery box includes a lower casing and a top cover.

[0099] A battery pack typically includes a housing, individual battery cells, and a separator. Both the individual battery cells and the separator are located inside the housing. The separator is located on the side of the individual battery cell away from the bottom wall of the housing, separating the individual battery cell from other components located above it, thus providing isolation.

[0100] Both the first and second cold plates are cold plates used to dissipate heat from the individual battery cells, thereby regulating their temperature. The cold plates can be constructed as liquid-cooled plates or phase-change cold plates, and are thermally connected to the battery. A refrigerant can be stored within the cold plate; cooling of the battery cells is achieved through a phase change of the refrigerant. The refrigerant can be a gas, solid, or liquid. Liquid refrigerants can also contain liquids with high specific heat capacity, such as water, to achieve liquid cooling of the battery cells.

[0101] The air-cooling plate is located at the bottom of the enclosure, connecting to the bottom of the side wall to form a sealed enclosure structure. It can be secured to the side wall using nuts or similar methods. To create an airflow cavity within the enclosure, a bottom plate is placed inside the barrel-shaped structure. Because the bottom of the battery is flat, the bottom plate needs to be parallel to the air-cooling plate, with a gap between them. This allows the bottom plate, side wall, and air-cooling plate to collectively form the airflow cavity. The liquid cooling plate contains liquid cooling channels, which can have various shapes, such as "U," "U-shaped," or "S-shaped." Optionally, the liquid cooling plate also includes an inlet and an outlet, both of which are connected to the current collector for the inlet and outlet of the heat exchange medium. The liquid cooling plate can be made of a material with a certain degree of hardness and strength (such as stainless steel), making it less prone to deformation when the battery cell is subjected to pressure or impact, thus enabling the battery cell to have higher structural strength and improved safety performance. The liquid cooling plate can be made of various materials, including but not limited to: copper, iron, aluminum, stainless steel, and aluminum alloys. It can also be made of nylon, plastic, etc.

[0102] The terms "parallel" and "perpendicular" used in this application can mean not only perfectly parallel and perpendicular, but also have a certain margin of error; for example, if the angle between the two is greater than or equal to 0° and less than or equal to 5°, they are considered to be parallel; if the angle between the two is greater than or equal to 85° and less than or equal to 95°, they are considered to be perpendicular.

[0103] The features, structures, or characteristics described above can be combined in any suitable manner in one or more embodiments, and the features discussed in the various embodiments are interchangeable where possible. In the above description, numerous specific details are provided to give a full understanding of embodiments of the present invention. However, those skilled in the art will recognize that the technical solutions of the present invention can be practiced without one or more of the specific details described, or other methods, components, materials, etc., can be employed. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring various aspects of the present invention.

[0104] The terms “about” or “approximately” as used in this specification generally mean within 20%, preferably within 10%, and even more preferably within 5% of a given value or range. The quantities given here are approximate, meaning that unless otherwise specified, the meanings of “about,” “approximately,” “roughly,” or “approximately” are implied.

[0105] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. A battery pack, characterized in that, include: The battery cell (1) includes at least one single cell (1L1). The first cold plate (2) and the second cold plate (3) are respectively disposed on opposite sides of the battery cell (1) in a first direction. The first cold plate (2) includes a first body part (21) and a first water nozzle (22) connected to each other. The second cold plate (3) includes a second body part (31) and a second water nozzle (32) connected to each other. The first water nozzle (22) and the second water nozzle (32) are located between the first body part (21) and the second body part (31). The connecting water pipe (4) includes a first end (41) and a second end (42) disposed opposite each other in the first direction. At least a portion of the first water nozzle (22) is inserted into the first end (41), and at least a portion of the second water nozzle (32) is inserted into the second end (42). The length of the connecting water pipe (4) is L1, and the length of the side of the battery unit (1) near the connecting water pipe (4) along the first direction is L2. The ratio of L1 to L2 is greater than or equal to 0.2 and less than or equal to 1.

2. The battery pack according to claim 1, characterized in that, The connecting water pipe (4) also includes an intermediate section (43), which is connected between the first end (41) and the second end (42). The inner diameter of the intermediate section (43) is greater than the inner diameter of the first water tap (22), and / or the inner diameter of the intermediate section (43) is greater than the inner diameter of the second water tap (32).

3. The battery pack according to claim 1, characterized in that, The distance between the first water tap (22) and the second water tap (32) along the first direction is L3, and the ratio of L3 to L1 is greater than or equal to 0.1 and less than or equal to 0.

8.

4. The battery pack according to claim 3, characterized in that, The length L1 of the connecting water pipe (4) is greater than or equal to 50 mm and less than or equal to 260 mm, and / or the distance L3 between the first water nozzle (22) and the second water nozzle (32) along the first direction is greater than or equal to 20 mm and less than or equal to 200 mm.

5. The battery pack according to claim 1, characterized in that, The distance K1 between the end face of the first end (41) and the first body part (21) is greater than or equal to 15 mm and less than or equal to 30 mm; and / or the distance K2 between the end face of the second end (42) and the second body part (31) is greater than or equal to 15 mm and less than or equal to 30 mm.

6. The battery pack according to claim 1, characterized in that, The central axis of the connecting water pipe (4) is collinear with the central axis of the first water tap (22), and the central axis of the connecting water pipe (4) is collinear with the central axis of the second water tap (32).

7. The battery pack according to claim 1, characterized in that, The central axis of the connecting water pipe (4) intersects with the central axis of the first water tap (22) to form a first included angle J1, which is greater than 175° and less than or equal to 185°. And / or, the central axis of the connecting water pipe (4) intersects with the central axis of the second water nozzle (32) to form a second included angle J2, the second included angle J2 being greater than 175° and less than or equal to 185°.

8. The battery pack according to claim 1, characterized in that, The minimum distance d between the connecting water pipe (4) and the side of the battery unit (1) closest to the connecting water pipe (4) is greater than or equal to 2 mm and less than or equal to 10 mm.

9. The battery pack according to claim 8, characterized in that, The absolute value of the difference between the two ends of the connecting water pipe (4) and the side of the battery unit (1) near the connecting water pipe (4) is greater than or equal to 0 and less than or equal to 0.2 mm; or, a third included angle J3 is formed between the central axis of the connecting water pipe (4) and the side of the battery unit (1) near the connecting water pipe (4), and the third included angle J3 is greater than 0 and less than or equal to 5°.

10. The battery pack according to claim 1, characterized in that, The battery pack includes a support plate, and the central axis of the connecting water pipe (4) is parallel to the support plate; or, the central axis of the connecting water pipe (4) and the support plate form a fourth included angle, which is greater than 0 and less than or equal to 5°.

11. The battery pack according to claim 1, characterized in that, The single cell has a first large surface (1L11) and a second large surface (1L12) arranged opposite to each other. The first large surface (1L11) is attached to the first body part (21), and the second large surface (1L12) is attached to the second body part (31). The distance between the first large surface (1L11) and the second large surface (1L12) is L2, or L2 is two or more times the distance between the first large surface (1L11) and the second large surface (1L12). The ratio of L1 to L2 is greater than or equal to 0.7 and less than or equal to 1.

12. The battery pack according to claim 11, characterized in that, The length L1 of the connecting water pipe (4) is greater than or equal to 60 mm and less than or equal to 75 mm, and / or the length L2 of the side of the battery unit (1) near the connecting water pipe (4) along the first direction is greater than or equal to 62 mm and less than or equal to 90 mm.

13. The battery pack according to claim 1, characterized in that, The single cell has a first large surface (1L11) and a second large surface (1L12) arranged opposite to each other, and a third side surface (1L13) and a fourth side surface (1L14) arranged opposite to each other. The third side surface (1L13) and the fourth side surface (1L14) are both connected between the first large surface (1L11) and the second large surface (1L12). The third side surface (1L13) is attached to the first body part (21), and the fourth side surface (1L14) is attached to the second body part (31). The distance between the third side surface (1L13) and the fourth side surface (1L14) is L2, and the ratio of L1 to L2 is greater than or equal to 0.8 and less than or equal to 1.

14. The battery pack according to claim 13, characterized in that, The length L1 of the connecting water pipe (4) is greater than or equal to 200 mm and less than or equal to 260 mm, and / or the length L2 of the side of the battery unit (1) near the connecting water pipe (4) along the first direction is greater than or equal to 202 mm and less than or equal to 275 mm.

15. The battery pack according to claim 1, characterized in that, The single battery cell includes a base plate (1L15) and a cover plate (1L16) arranged opposite to each other. The base plate (1L15) is used to support the battery cell. The minimum distance between the connecting water pipe (4) and the cover plate (1L16) is less than the minimum distance between the connecting water pipe (4) and the base plate (1L15).

16. The battery pack according to claim 1, characterized in that, The single battery cell includes a base plate (1L15) and a cover plate (1L16) arranged opposite to each other. The base plate (1L15) is used to support the battery cell. The minimum distance between the connecting water pipe (4) and the base plate (1L15) is less than the minimum distance between the connecting water pipe (4) and the cover plate (1L16).

17. The battery pack according to claim 1, characterized in that, The single battery cell includes a base plate (1L15) and a cover plate (1L16) arranged opposite to each other. The base plate (1L15) is used to support the battery cell. The distance between the connecting water pipe (4) and the base plate (1L15) is equal to the distance between the connecting water pipe (4) and the cover plate (1L16).

18. The battery pack according to claim 1, characterized in that, The length L1 of the connecting water pipe (4) is greater than or equal to 50 mm and less than or equal to 260 mm, and / or the length L2 of the side of the battery unit (1) near the connecting water pipe (4) along the first direction is greater than or equal to 60 mm and less than or equal to 280 mm.

19. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1 to 18.

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