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 single battery having a first surface, a second surface and a third surface, the first surface being provided with a pole and / or an explosion-proof valve, and the second surface and the third surface being oppositely arranged in a first direction. A first heat-conducting sheet comprises a first heat-conducting body portion and a first interface portion connected to each other, the first heat-conducting body portion being attached to the second surface, and a first end of the first heat-conducting body portion protruding from the single battery. A second heat-conducting sheet is attached to the third surface, and the first interface portion is connected to a side of the first end close to the second heat-conducting sheet. A first intermediate water pipe is connected between the first interface portion and the second heat-conducting sheet, and the length of the first interface portion inserted into the first intermediate water pipe is L1. The distance between the second surface and the third surface is a when the state of charge is 100%, the distance between the second surface and the third surface is b when the state of charge is 0%, c is the difference between a and b, and the ratio of L1 to c is greater than or equal to 1.25 and less than or equal to 3000.

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, the charging speed of battery packs is required to be faster and faster. The faster the charging speed, the more heat is generated, which leads to higher requirements for cooling effect. Placing heat-conducting plates on both sides of the battery pack can achieve better cooling effect. Adjacent heat-conducting plates need to be connected by a middle water pipe. Under normal circumstances, the interface of the heat-conducting plate can be inserted into the middle water pipe to realize the connection between the heat-conducting plate and the middle water pipe.

[0003] However, the length of the middle water pipe that can be inserted into the interface is currently quite arbitrary. During the charging and discharging process of a single battery, the single battery will expand and contract, which will cause the single battery to squeeze the heat-conducting plate, causing the heat-conducting plate to move. Especially for the heat-conducting plates set on both sides, after long-term use, the interface and the middle water pipe are prone to loosening or even falling off.

[0004] 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

[0005] 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.

[0006] According to one aspect of this disclosure, a battery pack is provided, comprising: Box; At least one single battery cell is disposed in the housing. The single battery cell has a first surface, a second surface, and a third surface. The first surface is provided with an electrode post and / or an explosion-proof valve. The second surface and the third surface are disposed opposite to each other in a first direction, and the first direction is parallel to the first surface. The first heat-conducting sheet includes a first heat-conducting body portion and a first interface portion connected to each other. The first heat-conducting body portion is attached to the second surface. A heat exchange channel is provided in the first heat-conducting body portion. The first heat-conducting body portion has a first end and a second end that are disposed opposite to each other in a second direction. The first end protrudes from the single cell. The first interface portion is connected to the heat exchange channel. The second direction is parallel to the first surface and intersects with the first direction. The second heat-conducting sheet is attached to the third surface. A heat exchange channel is provided inside the second heat-conducting sheet. The first interface is connected to the side of the first end near the second heat-conducting sheet. A first intermediate water pipe is connected between the first interface portion and the second heat-conducting plate, and the length of the first interface portion inserted into the first intermediate water pipe is L1; when the single cell is in a 100% state of charge, the distance between the second surface and the third surface is a; when the single cell is in a 0% state of charge, the distance between the second surface and the third surface is b; c is the difference between a and b, and the ratio of L1 to c is greater than or equal to 1.25 and less than or equal to 3000.

[0007] The battery pack disclosed herein has a ratio of L1 to c greater than or equal to 1.25 and less than or equal to 3000. This not only makes the length L1 of the first interface portion inserted into the first intermediate water pipe suitable and easier to install, but also minimizes the compression of the first heat-conducting sheet even if the individual battery expands and contracts during charging and discharging. This results in a smaller displacement of the first heat-conducting sheet and prevents the first intermediate water pipe from loosening or falling off from the first interface portion.

[0008] According to another aspect of this disclosure, an electrical device is provided, including the battery pack described above.

[0009] The electrical device disclosed herein has a ratio of L1 to c greater than or equal to 1.25 and less than or equal to 3000. This not only makes the length L1 of the first interface portion inserted into the first intermediate water pipe suitable and relatively easy to install, but also minimizes the compression of the first heat-conducting sheet even if the individual battery expands and contracts during charging and discharging. This results in a smaller displacement of the first heat-conducting sheet and prevents the first intermediate water pipe from loosening or falling off from the first interface portion, thus ensuring the electrical safety of the electrical device.

[0010] 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

[0011] 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.

[0012] Figure 1 This is a schematic diagram of an example embodiment of the battery pack disclosed herein.

[0013] Figure 2 This is a schematic diagram of another example embodiment of the battery pack disclosed herein.

[0014] Figure 3 for Figure 2 A cross-sectional view of the connection between the first intermediate water pipe and the first interface section.

[0015] Figure 4 This is a cross-sectional view of another example embodiment of the connection between the first intermediate water pipe and the first interface.

[0016] Explanation of reference numerals in the attached figures: 1. Housing; 11. Base plate; 12. First side frame; 13. Second side frame; 2. Single cell; 2a. First single cell; 2b. Second single cell; 21. First surface; 22. Second surface; 23. Third surface; 24. Terminal post; 3. First heat-conducting sheet; 31. First heat-conducting body; 311. First end; 312. Second end; 32. First interface; 33. Second interface; 4. Second heat-conducting sheet; 51. First intermediate water pipe; 511. Adhesive part; 52. Second intermediate water pipe; X, the first direction; Y, the second direction. Detailed Implementation

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] This disclosure provides an exemplary embodiment of a battery pack, with reference to... Figures 1-4 As shown, the battery pack may include a housing 1, a first heat-conducting sheet 3, a second heat-conducting sheet 4, a first intermediate water pipe 51, and at least one individual battery 2; at least one individual battery 2 is disposed inside the housing 1, and the individual battery 2 has a first surface 21, a second surface 22, and a third surface 23. The first surface 21 is provided with a terminal post 24 and / or an explosion-proof valve. The second surface 22 and the third surface 23 are arranged opposite to each other in a first direction X, and the first direction X is parallel to the first surface 21. The first heat-conducting sheet 3 may include a first heat-conducting body part 31 and a first interface part 32 connected to each other. The first heat-conducting body part 31 is attached to the second surface 22. A heat exchange channel is provided inside the first heat-conducting body part 31. The first heat-conducting body part 31 has a first end 311 and a second end 312 arranged opposite to each other in a second direction Y. The first end 311 protrudes from the individual battery. Battery 2, the first interface portion 32 is connected to the heat exchange channel, the second direction Y is parallel to the first surface 21 and intersects the first direction X; the second heat-conducting sheet 4 is attached to the third surface 23, the second heat-conducting sheet 4 is provided with a heat exchange channel, the first interface portion 32 is connected to the side of the first end 311 near the second heat-conducting sheet 4; the first intermediate water pipe 51 is connected between the first interface portion 32 and the second heat-conducting sheet 4, the length of the first interface portion 32 inserted into the first intermediate water pipe 51 is L1; when the single cell 2 is in a 100% state of charge, the distance between the second surface 22 and the third surface 23 is a; when the single cell 2 is in a 0% state of charge, the distance between the second surface 22 and the third surface 23 is b; c is the difference between a and b, and the ratio of L1 to c is greater than or equal to 1.25 and less than or equal to 3000.

[0022] The battery pack disclosed herein not only makes the length L1 of the first interface portion 32 inserted into the first intermediate water pipe 51 suitable and relatively easy to install, but also makes the compression of the first heat-conducting sheet 3 less even when the individual battery 2 expands and contracts during charging and discharging, resulting in a smaller displacement of the first heat-conducting sheet 3, and the first intermediate water pipe 51 will not loosen or fall off from the first interface portion 32.

[0023] In some exemplary embodiments of this disclosure, reference is made to Figure 1 As shown, the battery pack can be configured as a cuboid structure; therefore, the housing 1 can also be configured as a cuboid structure. Specifically, the housing 1 may include a base plate 11, a protective cover (not shown in the figure), two first side frames 12, and two second side frames 13. The base plate 11 and the protective cover can be rectangular. Two first side frames 12 and two second side frames 13 are provided around the base plate 11, connected end-to-end to form a rectangular frame. The first side frames 12 extend along a first direction X, and the second side frames 13 extend along a second direction Y. A protective cover is provided on the opposite side of the two first side frames 12 and two second side frames 13 from the base plate 11, such that the protective cover is positioned opposite the base plate 11. The two first side frames 12 and two second side frames 13 are connected between the protective cover and the base plate 11. The base plate 11, the protective cover, the two first side frames 12, and the two second side frames 13 surround and form the receiving cavity of the housing 1.

[0024] Of course, in other exemplary embodiments of this disclosure, the base plate 11 and the protective cover can be circular, elliptical, trapezoidal, etc., and the side frame can be one or more, forming a circle, ellipse, trapezoid, etc., so that the box 1 is formed as a cylinder, elliptical cylinder, prism, etc. The box 1 can also be other shapes, which will not be described in detail here.

[0025] In some exemplary embodiments of this disclosure, at least one single battery cell 2 is provided inside the housing 1. For example, one single battery cell 2 may be provided inside the housing 1, or two, three or more single battery cells 2 may be provided inside the housing 1.

[0026] Reference Figure 1 and Figure 2 As shown, the single-cell battery 2 has a first surface 21, a second surface 22, and a third surface 23. The first surface 21 is provided with a terminal post 24 and / or an explosion-proof valve. That is, the first surface 21 can be provided with a terminal post 24, an explosion-proof valve, or both. The second surface 22 and the third surface 23 are arranged opposite to each other in the first direction X, such that the second surface 22 and the third surface 23 are perpendicular to the first direction X. The first direction X is parallel to the first surface 21, so that the first surface 21 is not coplanar with the second surface 22 and the third surface 23. That is, the second surface 22 and the third surface 23 are not provided with a terminal post 24 or an explosion-proof valve.

[0027] In some exemplary embodiments of this disclosure, the first heat-conducting sheet 3 may include a first heat-conducting body portion 31 and a first interface portion 32 connected to each other. A heat exchange channel is provided in the first heat-conducting body portion 31. When the single cell 2 needs to be heated, a heat exchange medium with a higher temperature can be introduced into the heat exchange channel, and the heat of the heat exchange medium is transferred to the single cell 2 to achieve heating of the single cell 2. When the single cell 2 needs to be cooled, a heat exchange medium with a lower temperature can be introduced into the heat exchange channel, and the heat of the single cell 2 is transferred to the heat exchange medium to achieve cooling of the single cell 2. The following description uses water as the heat exchange medium.

[0028] The first thermally conductive body portion 31 is attached to the second surface 22 for cooling the individual battery cell 2. The first thermally conductive body portion 31 has a first end 311 and a second end 312 disposed opposite to each other in the second direction Y. The first end 311 protrudes from the individual battery cell 2. Specifically, the first end 311 protrudes from the individual battery cell 2 in the second direction Y. The first interface portion 32 is connected to a heat exchange channel, through which a heat exchange medium can flow into the heat exchange channel within the first thermally conductive body portion 31, and the heat exchange medium can also flow out through the first interface portion 32.

[0029] It should be noted that the second direction Y is parallel to the first surface 21 and intersects the first direction X. For example, the second direction Y is parallel to the first surface 21 and perpendicular to the first direction X.

[0030] In some exemplary embodiments of this disclosure, the second heat-conducting sheet 4 is attached to the third surface 23 for cooling the individual battery cell 2. The first heat-conducting sheet 3 and the second heat-conducting sheet 4 can simultaneously cool the individual battery cell 2, achieving a better cooling effect.

[0031] It should be noted that, referring to Figure 1 As shown, the first heat-conducting sheet 3 and the second heat-conducting sheet 4 can also be attached to the second surface 22 and the third surface 23 of two adjacent single-cell batteries 2, that is, the first heat-conducting sheet 3 is attached to the second surface 22 of one single-cell battery 2, and the second heat-conducting sheet 4 is attached to the third surface 23 of the other single-cell battery 2; see reference. Figure 2 As shown, the first heat-conducting sheet 3 and the second heat-conducting sheet 4 can also be attached to the second surface 22 and the third surface 23 of the same single cell 2.

[0032] The second heat-conducting plate 4 is provided with a heat exchange channel. When the single cell 2 needs to be heated, a heat exchange medium with a higher temperature can be introduced into the heat exchange channel, and the heat of the heat exchange medium is transferred to the single cell 2 to achieve heating. When the single cell 2 needs to be cooled, a heat exchange medium with a lower temperature can be introduced into the heat exchange channel, and the heat of the single cell 2 is transferred to the heat exchange medium to achieve cooling.

[0033] The first interface portion 32 is connected to the side of the first end 311 near the second heat-conducting plate 4, and the first interface portion 32 extends along the first direction X.

[0034] In some exemplary embodiments of this disclosure, reference is made to Figures 1-3 As shown, the first intermediate water pipe 51 is connected between the first interface portion 32 and the second heat-conducting plate 4, and the first intermediate water pipe 51 extends along the first direction X. Specifically, the first intermediate water pipe 51 and the second heat-conducting plate 4 can be an integral structure. For example, the first intermediate water pipe 51 and the second heat-conducting plate 4 can be a one-piece molded structure, or the first intermediate water pipe 51 and the second heat-conducting plate 4 can be fixedly connected by welding.

[0035] Reference Figure 3 As shown, the length of the first interface portion 32 inserted into the first intermediate water pipe 51 is L1, that is, the length of the overlapping part of the first interface portion 32 and the first intermediate water pipe 51 is L1; when the single cell 2 is in the 0% state of charge (SOC), the distance between the second surface 22 and the third surface 23 is b; when charged at a rate of 1C (representing the current value at which the battery completes charging in 1 hour), and fully charged to 100% state of charge, the distance between the second surface 22 and the third surface 23 when the single cell 2 is in the 100% state of charge is a; c is the difference between a and b, that is, c is the change in the distance between the second surface 22 and the third surface 23 when the single cell 2 is in the fully charged state and the zero-charge state; the larger the value of c, the more severe the compression of the heat-conducting sheet, and the greater the displacement of the heat-conducting sheet. The ratio of L1 to c is greater than or equal to 1.25 and less than or equal to 3000. For example, the ratio of L1 to c can be 1.5, 2, 50, 100, 200, 500, 700, 1000, 1300, 1500, 1800, 2000, 2200, 2500, 2700, etc.

[0036] If the ratio of L1 to c is too small, the length L1 of the first interface 32 inserted into the first intermediate water pipe 51 will be too small. The larger the value of c, the more severe the compression on the first heat-conducting plate 3 will be, and the greater the displacement of the first heat-conducting plate 3 will be. This will make the first intermediate water pipe 51 easy to fall off the first interface 32 and cause water leakage.

[0037] If the ratio of L1 to c is too small, the length L1 of the first interface 32 inserted into the first intermediate water pipe 51 will be too large, resulting in greater installation difficulty.

[0038] The above-mentioned numerical range not only makes the length L1 of the first interface 32 inserted into the first intermediate water pipe 51 suitable and easier to install, but also makes the compression of the first heat-conducting sheet 3 less even if the single battery 2 expands and contracts during charging and discharging, resulting in a smaller displacement of the first heat-conducting sheet 3, and the first intermediate water pipe 51 will not loosen or fall off from the first interface 32.

[0039] Optionally, the length L1 of the first interface portion 32 inserted into the first intermediate water pipe 51 is greater than or equal to 5 mm and less than or equal to 30 mm. For example, the length L1 of the first interface portion 32 inserted into the first intermediate water pipe 51 can be 7 mm, 10 mm, 13 mm, 15 mm, 18 mm, 20 mm, 22 mm, 25 mm, 27 mm, etc.

[0040] The value of c is greater than or equal to 0.01 mm and less than or equal to 4 mm, that is, the difference between a and b is greater than or equal to 0.01 mm and less than or equal to 4 mm. For example, the difference between a and b can be 0.1 mm, 0.3 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.7 mm, 2 mm, 2.3 mm, 2.5 mm, 2.8 mm, 3 mm, 3.2 mm, 3.5 mm, 3.7 mm, etc.

[0041] In some exemplary embodiments of this disclosure, in the first direction X, the length of the first intermediate water pipe 51 is L, and the ratio of L1 to L is greater than or equal to 0.1 and less than or equal to 0.6. For example, the ratio of L1 to L can be 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, etc.

[0042] If the ratio of L1 to L is too large, the length L1 of the first interface 32 inserted into the first intermediate water pipe 51 will be too large, making installation more difficult. Moreover, since the inner diameter of the first interface 32 is smaller than the inner diameter of the first intermediate water pipe 51, the water flow velocity in the first interface 32 is greater than the water flow velocity in the first intermediate water pipe 51, causing the water flow to change from fast to slow over a short distance, resulting in a more turbulent water flow and greater noise.

[0043] If the ratio of L1 to L is too small, the length L1 of the first interface 32 inserted into the first intermediate water pipe 51 will be too small, making it easy for the first intermediate water pipe 51 to fall off the first interface 32 and cause water leakage.

[0044] The above-mentioned numerical range not only makes the length L1 of the first interface 32 inserted into the first intermediate water pipe 51 appropriate and easier to install; but also prevents the first intermediate water pipe 51 from becoming loose or falling off from the first interface 32; and allows the water flow to be sufficiently slowed down within the first intermediate water pipe 51, reducing noise.

[0045] Alternatively, in the first direction X, the length L of the first intermediate water pipe 51 is greater than or equal to 50 mm and less than or equal to 260 mm. For example, the length L of the first intermediate water pipe 51 can be 70 mm, 100 mm, 130 mm, 150 mm, 180 mm, 200 mm, 220 mm, 150 mm, etc.

[0046] In some exemplary embodiments of this disclosure, in the first direction X, the length of the first interface portion 32 is L2, and 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.

[0047] If the ratio of L1 to L2 is too large, the length L1 of the first interface part 32 inserted into the first intermediate water pipe 51 will be too large, and the length L2 of the first interface part 32 will be too small, resulting in greater installation difficulty; and even if the first interface part 32 is fully inserted into the first intermediate water pipe 51, the first intermediate water pipe 51 may easily fall off the first interface part 32, causing water leakage.

[0048] If the ratio of L1 to L2 is too small, the length L1 of the first interface 32 inserted into the first intermediate water pipe 51 will be too small, making it easy for the first intermediate water pipe 51 to fall off the first interface 32 and cause leakage; if the length L2 of the first interface 32 is too large, the water flow will change from fast to slow in a short distance, resulting in a more turbulent water flow and greater noise.

[0049] The above-mentioned numerical range not only makes the length L1 of the first interface 32 inserted into the first intermediate water pipe 51 appropriate, and the length L2 of the first interface 32 appropriate, making it easier to install; but also prevents the first intermediate water pipe 51 from becoming loose or falling off the first interface 32; and allows the water flow to be sufficiently slowed down within the first intermediate water pipe 51, reducing noise.

[0050] Alternatively, the length L2 of the first interface portion 32 is greater than or equal to 15 mm and less than or equal to 30 mm. For example, the length L2 of the first interface portion 32 can be 18 mm, 20 mm, 22 mm, 25 mm, 27 mm, etc.

[0051] In some exemplary embodiments of this disclosure, at least a portion of the outer sidewall of the first interface portion 32 is fitted with the inner sidewall of the first intermediate water pipe 51. For example, a portion of the outer sidewall of the first interface portion 32 may be fitted with the inner sidewall of the first intermediate water pipe 51, or all the outer sidewalls of the first interface portion 32 may be fitted with the inner sidewall of the first intermediate water pipe 51.

[0052] Specifically, refer to Figure 3 As shown, the portion of the outer wall of the first interface portion 32 that fits against the first intermediate water pipe 51 is called the fitting portion 511. The fitting portions 511 are continuously arranged. For example, when the first interface portion 32 is cylindrical, the outer wall of the portion of the first interface portion 32 that is inserted into the first intermediate water pipe 51 is fitted against the first intermediate water pipe 51, forming a continuous fitting portion 511. This arrangement facilitates the installation of the first intermediate water pipe 51.

[0053] Of course, in some other exemplary embodiments of this disclosure, reference is made to Figure 4 As shown, the two fitting portions 511 can be arranged alternately, meaning that the two fitting portions 511 that fit between the outer wall of the first interface portion 32 and the first intermediate water pipe 51 are not continuous. For example, if a boss is provided on the outer wall of the first interface portion 32, due to the supporting effect of the boss on the first intermediate water pipe 51, the portion where the outer wall of the first interface portion 32 fits with the first intermediate water pipe 51 consists of two fitting portions 511. These two fitting portions 511 are located on both sides of the boss and are not continuous, thus forming a discontinuous structure of fitting portions 511. This arrangement prevents the first intermediate water pipe 51 from detaching from the first interface portion 32 and causing water leakage.

[0054] In some exemplary embodiments of this disclosure, reference is made to Figure 4 As shown, the end face of the first intermediate water pipe 51 near the first heat-conducting body part 31 is attached to the first heat-conducting body part 31, that is, the first intermediate water pipe 51 is inserted all the way to the first heat-conducting body part 31, so that the first interface part 32 is completely located inside the first intermediate water pipe 51, preventing the first intermediate water pipe 51 from falling off the first interface part 32 and causing water leakage.

[0055] Of course, in some other exemplary embodiments of this disclosure, reference is made to Figure 3 As shown, a gap may be provided between the end face of the first intermediate water pipe 51 near the first heat-conducting body part 31 and the first heat-conducting body part 31. Specifically, the width of the gap is greater than or equal to 1 mm and less than or equal to 3 mm. For example, the width of the gap may be 1.2 mm, 1.5 mm, 1.7 mm, 2 mm, 2.3 mm, 2.5 mm, 2.8 mm, etc.

[0056] If the gap is too small, the length of the first interface 32 inserted into the first intermediate water pipe 51 will be too long, making installation difficult.

[0057] If the gap is too wide, the length of the first interface 32 inserted into the first intermediate water pipe 51 will be too short, making it easy for the first intermediate water pipe 51 to fall off the first interface 32 and cause leakage.

[0058] The above-mentioned numerical range ensures that the length of the first interface 32 inserted into the first intermediate water pipe 51 is appropriate, preventing the first intermediate water pipe 51 from falling off the first interface 32 and causing water leakage, and also makes installation easy.

[0059] In some exemplary embodiments of this disclosure, reference is made to Figures 1-3 As shown, the single cell 2 can be configured as a cuboid structure, giving it two large, oppositely arranged surfaces and four side surfaces connected end-to-end. The two large surfaces are connected to opposite sides of the four side surfaces. The large surfaces are the surfaces with the largest area of ​​the single cell 2.

[0060] Reference Figure 1 As shown, the second surface 22 and the third surface 23 are the surfaces with the largest area of ​​the single cell 2, that is, the second surface 22 and the third surface 23 are two large surfaces of the single cell 2 arranged opposite each other. The first heat-conducting sheet 3 cools one large surface of the single cell 2, and the second heat-conducting sheet 4 cools the other large surface of the single cell 2. The cooling area is the largest, which can achieve a better cooling effect on the single cell 2 and is more conducive to realizing fast charging. As a result, the bulging of the large surface of the single cell 2 is smaller. That is, when the single cell 2 is at 100% state of charge (SOC), the distance 'a' between the second surface 22 and the third surface 23 is smaller, which makes the maximum value of 'c' smaller. Therefore, the minimum value of the ratio of L1 to c increases, that is, the ratio of L1 to c is greater than or equal to 2.5 and less than or equal to 3000.

[0061] Specifically, in this case, the value of c is greater than or equal to 0.01 mm and less than or equal to 2 mm, that is, the difference between a and b is greater than or equal to 0.01 mm and less than or equal to 2 mm. For example, the difference between a and b can be 0.1 mm, 0.3 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.7 mm, etc. The length L1 of the first interface portion 32 inserted into the first intermediate water pipe 51 is greater than or equal to 5 mm and less than or equal to 30 mm.

[0062] In some exemplary embodiments of this disclosure, reference is made to Figure 2 As shown, multiple individual cells 2 are arranged in a row along the second direction Y. Each individual cell 2 has a large surface perpendicular to the second direction Y, such that the large surfaces of adjacent individual cells 2 are positioned close to each other. The second surface 22 and the third surface 23 are the smaller side surfaces of the individual cells 2. The second surfaces 22 of the multiple individual cells 2 are all in contact with the first heat-conducting sheet 3, and the third surfaces 23 of the multiple individual cells 2 are all in contact with the second heat-conducting sheet 4. The first heat-conducting sheet 3 and the second heat-conducting sheet 4 can simultaneously cool multiple individual cells 2, reducing the space occupied inside the housing 1 and improving energy density.

[0063] Optionally, the cell 2 closest to the first intermediate water pipe 51 among the multiple individual cells 2 is designated as the first individual cell 2a. The c value of the first individual cell 2a is greater than or equal to 0.01 mm and less than or equal to 2 mm. For example, the c value of the first individual cell 2a can be 0.1 mm, 0.3 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.7 mm, etc. The length L1 of the first interface portion 32 inserted into the first intermediate water pipe 51 is greater than or equal to 5 mm and less than or equal to 30 mm. For the first individual cell 2a, the ratio of L1 to c is greater than or equal to 2.5 and less than or equal to 3000. For example, the ratio of L1 to c for the first individual cell 2a can be 3, 50, 100, 200, 500, 700, 1000, 1300, 1500, 1800, 2000, 2200, 2500, 2700, etc.

[0064] Since the first single cell 2a is located close to the first intermediate water pipe 51, the expansion and contraction of the first single cell 2a during charging and discharging has a significant impact on the connection stability between the first intermediate water pipe 51 and the first interface 32. Therefore, it is necessary to limit the c value of the first single cell 2a. For example, the c value of the first single cell 2a can be appropriately reduced during the design process, thereby increasing the minimum value of the ratio of L1 to c, that is, the ratio of L1 to c is greater than or equal to 2.5 and less than or equal to 3000.

[0065] Optionally, the middle cell 2 among the multiple individual cells 2 is designated as the second individual cell 2b. The c value of the second individual cell 2b is greater than or equal to 0.01 mm and less than or equal to 3 mm. For example, the c value of the second individual cell 2b can be 0.1 mm, 0.3 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.7 mm, 2 mm, 2.3 mm, 2.5 mm, 2.8 mm, etc. The length L1 of the first interface portion 32 inserted into the first intermediate water pipe 51 is greater than or equal to 5 mm and less than or equal to 30 mm. For the second individual cell 2b, the ratio of L1 to c is greater than or equal to 1.67 and less than or equal to 3000. For example, the ratio of L1 to c for the second individual cell 2b can be 2, 50, 100, 200, 500, 700, 1000, 1300, 1500, 1800, 2000, 2200, 2500, 2700, etc.

[0066] Since the second cell 2b is located in the middle of multiple cells 2, it is not easy to dissipate heat, which leads to more severe thermal expansion of the second cell 2b. Therefore, it is necessary to limit the c value of the second cell 2b. For example, the c value of the second cell 2b can be appropriately reduced during the design. This will increase the minimum value of the ratio of L1 to c, that is, the ratio of L1 to c is greater than or equal to 1.67 and less than or equal to 3000.

[0067] It should be noted that the two individual cells 2 that are not located at both ends of the second direction Y are all second individual cells 2b, that is, the individual cells 2 that are provided on both sides of the second direction Y are all second individual cells 2b.

[0068] In some exemplary embodiments of this disclosure, reference is made to Figure 1 and Figure 2 As shown, the second end 312 protrudes from the single cell 2. Specifically, the second end 312 protrudes from the single cell 2 in the second direction Y. The first heat-conducting plate 3 may also include a second interface portion 33, which extends along the first direction X. The second interface portion 33 is connected to the side of the second end 312 near the second heat-conducting plate 4 and communicates with the heat exchange channel. The heat exchange medium can flow into the heat exchange channel in the first heat-conducting body portion 31 through the first interface portion 32, and the heat exchange medium can also flow out through the second interface portion 33. Of course, it can also be arranged in reverse. The specific structure of the second interface portion 33 can be the same as the specific structure of the first interface portion 32, so it will not be described again here.

[0069] The battery pack may also include a second intermediate water pipe 52, which connects the second interface portion 33 and the second heat-conducting plate 4. The second intermediate water pipe 52 extends along the first direction X. Specifically, the second intermediate water pipe 52 and the second heat-conducting plate 4 can be an integral structure. For example, the second intermediate water pipe 52 and the second heat-conducting plate 4 can be a single molded structure, or they can be fixedly connected by welding. The specific structure of the second intermediate water pipe 52 can be the same as that of the first intermediate water pipe 51, therefore, it will not be described in detail here.

[0070] The relationship between the second intermediate water pipe 52 and the second interface 33 can be the same as the relationship between the first intermediate water pipe 51 and the first interface 32, so it will not be described again here.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] A battery pack is formed by connecting multiple battery cells with similar capacity and internal resistance in series or parallel.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] A battery pack typically consists of a battery box and battery modules. The battery box includes a lower casing and a top cover.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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 invention. However, those skilled in the art will recognize that the technical solutions of the 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 invention.

[0084] 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.

[0085] 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: Box (1); At least one single battery cell (2) is disposed inside the housing (1). The single battery cell (2) has a first surface (21), a second surface (22) and a third surface (23). The first surface (21) is provided with a terminal post (24) and / or an explosion-proof valve. The second surface (22) and the third surface (23) are disposed opposite to each other in a first direction, which is parallel to the first surface (21). The first heat-conducting sheet (3) includes a first heat-conducting body part (31) and a first interface part (32) connected to each other. The first heat-conducting body part (31) is attached to the second surface (22). A heat exchange channel is provided in the first heat-conducting body part (31). The first heat-conducting body part (31) has a first end (311) and a second end (312) arranged opposite to each other in a second direction. The first end (311) protrudes from the single cell (2). The first interface part (32) is connected to the heat exchange channel. The second direction is parallel to the first surface (21) and intersects with the first direction. The second heat-conducting sheet (4) is attached to the third surface (23). A heat exchange channel is provided inside the second heat-conducting sheet (4). The first interface part (32) is connected to the side of the first end (311) near the second heat-conducting sheet (4). The first intermediate water pipe (51) is connected between the first interface part (32) and the second heat-conducting plate (4), and the length of the first interface part (32) inserted into the first intermediate water pipe (51) is L1; when the single cell (2) is in a 100% state of charge, the distance between the second surface (22) and the third surface (23) is a; when the single cell (2) is in a 0% state of charge, the distance between the second surface (22) and the third surface (23) is b; c is the difference between a and b, and the ratio of L1 to c is greater than or equal to 1.25 and less than or equal to 3000.

2. The battery pack according to claim 1, characterized in that, In the first direction, the length of the first intermediate water pipe (51) is L, and the ratio of L1 to L is greater than or equal to 0.1 and less than or equal to 0.

6.

3. The battery pack according to claim 2, characterized in that, In the first direction, the length L of the first intermediate water pipe (51) is greater than or equal to 50 mm and less than or equal to 260 mm.

4. The battery pack according to claim 1, characterized in that, In the first direction, the length of the first interface portion (32) is L2, and the ratio of L1 to L2 is greater than or equal to 0.2 and less than or equal to 1.

5. The battery pack according to claim 4, characterized in that, In the first direction, the length L2 of the first interface portion (32) 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, At least a portion of the outer sidewall of the first interface portion (32) is in contact with the inner sidewall of the first intermediate water pipe (51).

7. The battery pack according to claim 6, characterized in that, The portion of the outer wall of the first interface portion (32) that is in contact with the first intermediate water pipe (51) is called the fitting portion (511). The fitting portions (511) are continuously arranged, or the fitting portions (511) are set as two, and the two fitting portions (511) are arranged at intervals.

8. The battery pack according to claim 1, characterized in that, The end face of the first intermediate water pipe (51) near the first heat-conducting body part (31) is in contact with the first heat-conducting body part (31), or a gap is provided between the end face of the first intermediate water pipe (51) near the first heat-conducting body part (31) and the first heat-conducting body part (31).

9. The battery pack according to claim 8, characterized in that, The width of the gap is greater than or equal to 1 mm and less than or equal to 3 mm.

10. The battery pack according to claim 1, characterized in that, The second surface (22) and the third surface (23) are the surfaces with the largest area of ​​the single cell (2), and the ratio of L1 to c is greater than or equal to 2.5 and less than or equal to 3000.

11. The battery pack according to claim 10, characterized in that, The length L1 of the first interface part (32) inserted into the first intermediate water pipe (51) is greater than or equal to 5 mm and less than or equal to 30 mm, and / or the value of c is greater than or equal to 0.01 mm and less than or equal to 2 mm.

12. The battery pack according to claim 1, characterized in that, The single cell (2) is configured as a plurality of cells, and the plurality of single cells (2) are arranged in a row along the second direction. The single cell (2) has a large surface, which is perpendicular to the second direction. The second surface (22) of the plurality of single cells (2) is in contact with the first heat-conducting sheet (3), and the third surface (23) of the plurality of single cells (2) is in contact with the second heat-conducting sheet (4).

13. The battery pack according to claim 12, characterized in that, Among the multiple individual cells (2), the individual cell (2) closest to the first intermediate water pipe (51) is the first individual cell (2a). The c value of the first individual cell (2a) is greater than or equal to 0.01 mm and less than or equal to 2 mm. For the first individual cell (2a), the ratio of L1 to c is greater than or equal to 2.5 and less than or equal to 3000.

14. The battery pack according to claim 12, characterized in that, The middle cell (2) among the plurality of individual cells (2) is the second cell (2b). The c value of the second cell (2b) is greater than or equal to 0.01 mm and less than or equal to 3 mm. For the second cell (2b), the ratio of L1 to c is greater than or equal to 1.67 and less than or equal to 3000.

15. The battery pack according to claim 13 or 14, characterized in that, The length L1 of the first interface part (32) inserted into the first intermediate water pipe (51) is greater than or equal to 5 mm and less than or equal to 30 mm.

16. The battery pack according to claim 1, characterized in that, The second end (312) protrudes from the single cell (2), and the first heat-conducting sheet (3) further includes a second interface portion (33), which is connected to the side of the second end (312) near the second heat-conducting sheet (4); The battery pack also includes: The second intermediate water pipe (52) is connected between the second interface part (33) and the second heat-conducting plate (4).

17. The battery pack according to claim 1, characterized in that, The length L1 of the first interface part (32) inserted into the first intermediate water pipe (51) is greater than or equal to 5 mm and less than or equal to 30 mm, and / or the value of c is greater than or equal to 0.01 mm and less than or equal to 4 mm.

18. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1 to 17.

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