Battery packs and vehicles

Abstract

Embodiments of the present application disclose a battery pack and a vehicle. The battery pack includes: a first heat conductor and a second heat conductor arranged at intervals along a first direction. The first heat conductor includes a plurality of first plates, the plurality of first plates are connected in sequence, and a first angle is formed between two adjacent first plates. The second heat conductor includes a plurality of second plates, the plurality of second plates are connected in sequence, and a second angle is formed between two adjacent second plates. Single cells are sandwiched between the first and second plates. According to the present application, the connection reliability of the single cells in the battery pack is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack and a vehicle. Background Art

[0002] The battery packs typically used in electric vehicles are assembled from individual cells into modules, which are then installed in a battery pack, forming a three-stage assembly model: cell-module-pack. CTP (Cell to Pack) technology, however, directly integrates individual cells into a battery pack, eliminating the intermediate module step.

[0003] At present, in battery packs using CTP, single cells are sandwiched between two parallel flat liquid-cooling plates. The single cells and the liquid-cooling plates are directly fixed by adhesive. As the battery pack is used for a longer time or is subjected to a strong impact, the adhesive will have a greater risk of failure. The single cells may move relative to the liquid-cooling plates, thereby causing the single cells in the battery pack to be squeezed against each other, bringing the risk of damage to the single cells, seriously affecting the reliability and safety of the battery pack. Summary of the Invention

[0004] In order to solve the above technical problems, the embodiments of the present application disclose the following technical solutions:

[0005] In one aspect, a battery pack is provided, comprising a plurality of single cells and a first heat conductor and a second heat conductor. The single cells have a first side surface and a second side surface disposed opposite each other. The first heat conductor and the second heat conductor are spaced apart along a first direction. The first heat conductor comprises a plurality of first plates, which are sequentially connected along a second direction. A first angle is formed between two adjacent first plates, and the radian of the first angle is α1 rad, satisfying the following: π / 2<α1<π. The second heat conductor comprises a plurality of second plates, which are sequentially connected along a second direction. A second angle is formed between two adjacent second plates, and the radian of the second angle is α2 rad, satisfying the following: π / 2<α2<π. The first direction intersects the second direction. In at least a portion of the first plates and at least a portion of the second plates, each first plate is disposed opposite to a second plate and forms a first storage space. At least one single cell is disposed within the first storage space, with the first side surface connected to the first plate and the second side surface connected to the second plate.

[0006] In addition to or as an alternative to one or more features disclosed above, the first angle is equal to the second angle, the distance between the first side surface and the second side surface is D mm, and the following relationship is satisfied: 3≤D / α1≤100.

[0007] In addition to or as an alternative to one or more of the features disclosed above, a single cell is provided in the first accommodation space, and the first side surface and the second side surface are parallel; the single cell further includes a third side surface and a fourth side surface arranged opposite to each other, the third side surface and the fourth side surface are parallel to each other, the first side surface, the third side surface, the second side surface and the fourth side surface are connected end to end in sequence, and the angle between the first side surface and the third side surface is 90°; between two adjacent single cells, a third angle is formed between the third side surface of one and the fourth side surface of the other, and a second accommodation space is enclosed between the third side surface of one and the fourth side surface of the other and the first heat conductor or the second heat conductor.

[0008] In addition to or as an alternative to one or more features disclosed above, the radian of the third angle is βrad, satisfying: β+α1=π.

[0009] In addition to one or more of the features disclosed above, or as an alternative, a single cell is provided in the first accommodating space, the first side surface and the second side surface are parallel, the single cell further includes a third side surface and a fourth side surface arranged opposite to each other, the first side surface, the third side surface, the second side surface and the fourth side surface are connected end to end in sequence, the third side surface of one of two adjacent single cells is parallel to the fourth side surface of the other, and a fourth angle is formed between the first side surface and the third side surface, the radian of the fourth angle is γrad, satisfying: 0<γ<π / 2, or π / 2<γ<π.

[0010] In addition to one or more features disclosed above, or as an alternative, a first arc-shaped transition section is provided between adjacent first plates, the first plates are tangentially connected to the first arc-shaped transition section, and a first tangent is formed, and the first side extends to connect with the first tangent; a second arc-shaped transition section is provided between adjacent second plates, the second plates are tangentially connected to the second arc-shaped transition section, and a second tangent is formed, and the second side extends to connect with the second tangent.

[0011] In addition to or as an alternative to one or more features disclosed above, the second accommodation space is filled with at least one of a buffer structure, a heat conducting structure, a heat insulating structure and an insulating structure.

[0012] In addition to or as an alternative to one or more of the features disclosed above, an adhesive structure is connected between the single battery and the first plate or the second plate.

[0013] In addition to one or more of the features disclosed above, or as an alternative, the number of first plates is at least three, the first plates have a first surface and a second surface arranged opposite to each other, and the first surface is connected to the first side surface; among the at least three first plates connected in sequence, the two adjacent first surfaces at one end along the second direction form a fifth angle, and the two adjacent second surfaces at the other end form a sixth angle, and the radians of the fifth angle and the sixth angle are equal.

[0014] In addition to one or more of the features disclosed above, or as an alternative, there are multiple first heat conductors and multiple second heat conductors, the first heat conductors and the second heat conductors are alternately arranged along the first direction, and multiple single batteries are sandwiched between adjacent first heat conductors and second heat conductors.

[0015] In addition to one or more of the features disclosed above, or as an alternative, a first flow channel is provided in the first heat conductor, and a second flow channel is provided in the second heat conductor; at least partially adjacent to the first heat conductor and the second heat conductor, at one end along the second direction, the first heat conductor and the second heat conductor are connected by a connecting member, and a third flow channel is provided in the connecting member, and the third flow channel connects the first flow channel and the second flow channel.

[0016] In addition to or as an alternative to one or more of the features disclosed above,

[0017] The first area of ​​the first side is S1 cm 2 , the first flow channel sequentially penetrates the plurality of first plates along the extension direction of the first heat conducting member, and the dimension of the first flow channel in the thickness direction of the first plate is K1 cm, satisfying: 6≤S1 / K1≤6500; and / or

[0018] The second area of ​​the second side is S2cm 2 The second flow channel passes through the plurality of second plates in sequence along the extension direction of the second heat conducting member, and the dimension of the second flow channel in the thickness direction of the second plate is K2 cm, satisfying: 6≤S2 / K2≤6500.

[0019] In addition to or as an alternative to one or more of the features disclosed above,

[0020] The bonding structure includes a first bonding layer, the first side is bonded to the first plate through the first bonding layer, and the first area of ​​the first side is S1cm 2 , the elastic modulus of the first adhesive layer is E1 MPa, satisfying: 0.02 ≤ S1 / E1 ≤ 13; and / or

[0021] The bonding structure includes a second bonding layer, the second side is bonded to the second plate through the second bonding layer, and the second area of ​​the second side is S2cm 2 The elastic modulus of the second adhesive layer is E2MPa, satisfying: 0.02≤S2 / E2≤13.

[0022] In addition to or as an alternative to one or more of the features disclosed above, the first side surface and the second side surface are the sides with the largest surface area of ​​the single battery cell.

[0023] On the other hand, a vehicle is provided, comprising the above-mentioned battery pack.

[0024] One of the above technical solutions has the following advantages or beneficial effects:

[0025] In the present technical solution, single cells are accommodated in a plurality of first accommodating spaces formed by a plurality of first plates and a plurality of second plates. Since the first plates and the second plates are connected in sequence along the second direction, there is an angle between adjacent first plates and adjacent second plates. In this way, there is an angle between the first plate and both the first direction and the second direction, and there is an angle between the second plate and both the first direction and the second direction. Therefore, in the first direction and the second direction, the first plate and the second plate can limit the single cells. This limiting effect is more reliable than gluing and will not fail over time. This can greatly improve the connection stability of the single cells in the battery pack and avoid the safety risks caused by the mutual squeezing of the single cells in the second direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings will make the technical solutions and other beneficial effects of the present application apparent.

[0027] Figure 1 It is a schematic diagram of the structure of a battery pack in the prior art (the housing is omitted);

[0028] Figure 2 yes Figure 1 HH section view in;

[0029] Figure 3 This is a schematic structural diagram of an embodiment of a battery pack of the present application;

[0030] Figure 4 yes Figure 3 A schematic structural diagram of a single cell in the battery pack embodiment shown;

[0031] Figure 5 yes Figure 3 A schematic diagram of a battery pack embodiment in which a single battery is restrained;

[0032] Figure 6 is an exploded schematic diagram of another embodiment of the battery pack of the present application;

[0033] Figure 7 yes Figure 6 A schematic structural diagram of a single cell in the battery pack embodiment shown;

[0034] Figure 8 yes Figure 6 A schematic diagram of a battery pack in which a single battery is restrained is shown;

[0035] Figure 9 This is a structural diagram of another embodiment of the battery pack of the present application;

[0036] Figure 10 yes Figure 3 An enlarged view of a partial view in FIG;

[0037] Figure 11 This is a schematic structural diagram of the first heat-conducting member in an embodiment of the battery pack of the present application.

[0038] In the figure, 1 first heat conducting member, 2 second heat conducting member, 3 single battery, 4 first plate, 41 first surface, 42 second surface, 5 second plate, 6 first accommodating space, 7 first side surface, 8 second side surface, 9 top surface, 10 third side surface, 11 fourth side surface, 12 first arcuate transition section, 13 first tangent line, 14 second arcuate transition section, 15 second tangent line, 16 liquid inlet, 17 liquid outlet, 18 connecting member, 19 second accommodating space, A first angle, B second angle, C third angle, G fourth angle, E fifth angle, F sixth angle, X first direction, Y second direction, F1 first predetermined direction, F2 second predetermined direction. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and beneficial effects of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for the purpose of explaining this application and are not intended to limit this application.

[0040] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0041] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, direct connections, or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0042] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or diagonally above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly above or diagonally above the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0043] In the embodiments, "parallel" refers to the state where the angle formed by two lines, a line and a plane, or two planes is between -1° and 1°. Furthermore, "perpendicular" refers to the state where the angle formed by two lines, a line and a plane, or two planes is between 89° and 91°. Equal distances or equal angles refer to the state where the tolerance range is between -1% and 1%.

[0044] As the energy source of new energy vehicles, improving the energy density and safety performance of battery packs has become a new trend in the development of power batteries.

[0045] Current technology for cooling individual cells in a battery pack often requires the use of a colloid to secure the cells to the liquid cooling plate while simultaneously cooling the cells. However, relying solely on the colloid's connection limits its effectiveness, limited by its strength and lifespan.

[0046] See also Figure 1 and Figure 2 , Figure 1 is a schematic diagram of the structure of a battery pack in the prior art (housing 21 is omitted). Figure 2 yes Figure 1 HH section view in.

[0047] In the prior art, a battery pack includes a shell 21, a plurality of liquid cooling plates 22, and a plurality of single cells 23. The plurality of liquid cooling plates 22 are flat plates, fixed in the shell 21, and spaced apart along the first direction X. An accommodating space extending in the second direction Y is formed between two adjacent liquid cooling plates 22. A plurality of single cells 23 are sandwiched between the two liquid cooling plates 22 and stacked along the second direction Y. The side surfaces of each single cell 23 are in contact with the liquid cooling plate 22 for heat transfer. The single cell 23 is bonded to the liquid cooling plate 22 and / or the shell 21 by colloid to fix its position. In the first direction X, the single cell 23 is restricted by the liquid cooling plate 22 and its position is fixed. In the third direction Z, the single cell 23 is restricted by the shell 21 and its position is fixed. In the second direction Y, due to the connection strength and life of the colloid, when subjected to a strong impact, or when the second direction Y is parallel to the vehicle's travel direction, the single battery 23 has an acceleration along the second direction Y during the vehicle's acceleration and deceleration. As the battery pack is used for a longer time, the colloid will have a greater risk of failure. The single battery 23 may move relative to the liquid cooling plate 22 in the second direction Y, causing adjacent single batteries 23 in the second direction Y to squeeze each other, which may cause damage to the single battery and even cause the battery pack to catch fire.

[0048] This embodiment provides a vehicle including a battery pack.

[0049] A battery pack is also provided, in which the shapes of the first heat conducting member 1 and the second heat conducting member 2 (liquid cooling plate 22) are improved so as to limit the single battery 3 in two directions through the first heat conducting member 1 and the second heat conducting member 2.

[0050] See also Figure 3 , Figure 3 It is a structural diagram of an embodiment of the battery pack of the present application.

[0051] The battery pack includes a box (not shown), a plurality of single batteries 3 , a first heat conducting member 1 , and a second heat conducting member 2 .

[0052] The first heat conducting member 1 and the second heat conducting member 2 are spaced apart and fixedly disposed in the box along the first direction X. The fixing method is, for example, bolt fastening or gluing, which is not limited here.

[0053] Multiple single cells 3 are housed within the housing, supported on the bottom of the housing, and arranged sequentially along a second direction Y, sandwiched between the first heat conducting member 1 and the second heat conducting member 2. The first direction X intersects the second direction Y. Specifically, in the illustrated embodiment, the first direction X and the second direction Y are perpendicular. In this embodiment, the first direction X is parallel to the width of the housing, and the second direction Y is parallel to the length of the housing. In other embodiments, the first direction X may form an angle with the width of the housing, and the second direction Y may form an angle with the length of the housing.

[0054] The shape of the box is not limited. The box is not necessary. In some embodiments, when the battery pack is installed in a vehicle, the first heat conductor 1, the second heat conductor 2, and the single battery 3 can also be directly installed on the body of the vehicle. In this embodiment, the box is used to be installed on the body of the vehicle, and the length or width direction of the box is parallel to the length or width direction of the vehicle body, wherein the length direction of the vehicle body is the direction of travel. It is understandable that in other embodiments, the length direction of the box may intersect with the length or width direction of the vehicle body, which is not limited here.

[0055] The first thermal conductor 1 is a good conductor of heat. The first thermal conductor 1 can transfer heat from the single cell 3 to reduce the temperature of the single cell 3. The first thermal conductor 1 can also transfer heat to the single cell 3 to increase the temperature of the single cell 3. The first thermal conductor 1 includes multiple (six in the figure) first plates 4. Each first plate 4 is generally flat and is a good conductor of heat. The multiple first plates 4 are connected in sequence along the second direction Y, generally forming a broken line. It can be understood that the length extension of the first plates 4 is not parallel to the second direction Y, but rather the multiple first plates 4 are arranged along the second direction Y as a whole. That is, in this embodiment, the first plates 4 have an angle with the second direction Y. A first angle A is formed between two adjacent first plates 4. Multiple first plates 4 can be manufactured in one piece, for example, by bending a flat plate. This can greatly simplify the manufacturing process of the first heat-conducting member 1 and reduce manufacturing costs. In addition, the first heat-conducting member 1 is a broken line type, which uses less material than the S-shaped (surrounding three or four sides of the battery cell) liquid cooling plate and has a more obvious cost advantage.

[0056] The second heat-conducting member 2 is a good conductor of heat. The second heat-conducting member 2 can transfer heat from the single battery 3 to reduce the temperature of the single battery 3. The second heat-conducting member 2 can also transfer heat to the single battery 3 to increase the temperature of the single battery 3. The second heat-conducting member 2 includes a plurality of second plates 5 (six in the figure). The second plates 5 are generally flat. The plurality of second plates 5 are connected in sequence along the second direction Y, generally forming a broken line. A second angle B is formed between two adjacent second plates 5. The plurality of second plates 5 can be manufactured as a whole, for example, by bending a flat plate, which can also reduce manufacturing costs.

[0057] In some embodiments, the radian of the first angle A is α1rad, and the radian of the second angle B is α2rad, satisfying: π / 2<α1<π, more preferably, 3π / 5<α1<4π / 5. It should be noted that the intersection of two adjacent first plates 4 will form an angle with a larger angle and an angle with a smaller angle. The first angle A in this embodiment refers to the angle with a smaller angle; similarly, the second angle B also refers to the angle with a smaller angle enclosed by two adjacent second plates 5. In addition, along the second direction Y, the first angle A is alternately distributed on both sides of the first heat conductor 1 along the first direction X; along the second direction Y, the second angle B is alternately distributed on both sides of the second heat conductor 2 along the first direction X. Specifically, see Figure 11 In this embodiment, there are at least three first plates 4 , each having a first surface 41 and a second surface 42 oppositely disposed. The first surface 41 is connected to the first side surface 7 . In the at least three sequentially connected first plates 4 , two adjacent first surfaces 41 at one end along the second direction Y form a fifth angle E, and two adjacent second surfaces 42 at the other end form a sixth angle F. The fifth angle E and the sixth angle F have equal radians. The fifth angle E and the sixth angle F correspond to the first angle A. In other embodiments, the fifth angle E and the sixth angle F may be unequal to accommodate different box shapes.

[0058] In at least a portion of the first plate 4 and at least a portion of the second plate 5, one first plate 4 and one second plate 5 are disposed opposite each other to form a first receiving space 6. It should be noted that in this embodiment, the opposing first and second plates 4 and 5 are parallel. Specifically, in the illustrated embodiment, six first receiving spaces 6 are formed between the first heat conducting member 1 and the second heat conducting member 2.

[0059] At least one single battery cell 3 is disposed within the first storage space 6. In the illustrated embodiment, one single battery cell 3 is disposed within each first storage space 6. To illustrate the first storage space 6, the single battery cell 3 in the upper first storage space 6 is omitted. In other embodiments, two or more single batteries 3 may be accommodated within the first storage space 6, which is not a limitation here.

[0060] In some embodiments, two adjacent first plates 4 are symmetrically arranged along the first direction X. The line L1 connecting the centers of gravity Q1 of the plurality of first plates 4 is parallel to the second direction Y, and the line L2 connecting the centers of gravity Q2 of the plurality of second plates 5 is parallel to the second direction Y. It will be understood that in this embodiment, the first plates 4 are rectangular parallelepipeds with uniform density, with their centers of gravity located at the intersection of the diagonals. In other words, the entire length of the first and second thermally conductive members 1 and 2 extends along the second direction Y. This facilitates the uniform layout of the single cells 3 and the first and second thermally conductive members 1 and 2 within the battery pack, thereby improving the overall energy density of the battery pack. It should be noted that in other embodiments, the first plates 4 are not symmetrically arranged along the first direction X, but are modified accordingly to the shape of the housing to accommodate various housings or other structures within the battery pack.

[0061] Please also refer to Figure 4 , Figure 4 yes Figure 3 The structure diagram of the single battery 3 in the battery pack embodiment is shown.

[0062] The cell 3 has a first side surface 7 and a second side surface 8 that are oppositely disposed. Specifically, in the illustrated embodiment, the cell 3 is a conventional prismatic battery. In this embodiment, the dimensions of two adjacent cells 3 along the second direction Y are identical. In other embodiments, the dimensions of two adjacent cells 3 may be different. Prismatic batteries are a common battery structure on the market and are widely used. The cell 3 has an oppositely disposed top surface 9 and a bottom surface (not shown), as well as a first side surface 7, a second side surface 8, a third side surface 10, and a fourth side surface 11 connected between the top and bottom surfaces. The cell 3's terminal (not shown) is disposed on the top surface 9. The third side surface 10 and the fourth side surface 11 are oppositely disposed. The first side surface 7, the third side surface 10, the second side surface 8, and the fourth side surface 11 are connected end to end in sequence. The first side surface 7 and the second side surface 8 form a pair of parallel planes. In this embodiment, the third side surface 10 and the fourth side surface 11 form a pair of parallel planes. The angle between the first side surface 7 and the third side surface 10 is 90°.

[0063] The first side 7 of the single cell 3 is connected to the first plate 4. The second side 8 of the single cell 3 is connected to the second plate 5. "Connected" here includes direct bonding or bonding via other structures. In one embodiment, because the single cell 3 needs to be fixedly connected to the first plate 4, the first side 7 and the bonding surface of the first plate 4 are connected via a colloid, which forms the adhesive structure described below. In this embodiment, the first side 7 and the first plate 4 are considered to be bonded.

[0064] In this embodiment, the first side surface 7 and the second side surface 8 are the surfaces with the largest surface area of ​​the single cell 3, that is, the first side surface 7 and the second side surface 8 are the two opposite side surfaces of the single cell 3 along the thickness direction, and the areas of the first side surface 7 and the second side surface 8 are both larger than the third side surface 10, the fourth side surface 11, the top surface 9 and the bottom surface.

[0065] In the illustrated embodiment, the first side surface 7 has a larger area than the third side surface 10. The first side surface 7 is connected to the first heat conductor 1. Compared with the connection between the third side surface 10 and the first heat conductor 1, the heat transfer area is larger and heat can be transferred more effectively. The second side surface 8 is connected to the second plate body 5, which can also increase the heat dissipation area and improve the heat dissipation efficiency.

[0066] In some embodiments, an adhesive structure (not visible in the figure) is connected between the single battery 3 and the first plate 4 and / or the second plate 5 .

[0067] In one embodiment, the assembly process includes the following steps: arranging a plurality of single cells 3 in a predetermined posture; applying colloid on adjacent surfaces of the first heat-conducting member 1 and the second heat-conducting member 2, so that the first heat-conducting member 1 and the second heat-conducting member 2 are respectively located on either side of the plurality of single cells 3, and the sides of the first heat-conducting member 1 and the second heat-conducting member 2 coated with the colloid are close to the single cells 3 to clamp the plurality of single cells 3, and the single cells 3 are fixedly connected to the first heat-conducting member 1 and the second heat-conducting member 2 via the colloid, and then the first heat-conducting member 1 and the second heat-conducting member 2 are fixed to the box.

[0068] In one embodiment, the assembly process includes the following steps: fixing the first heat-conducting member 1 to the housing; applying colloid on one side of the single battery 3 or the first heat-conducting member 1, and sequentially arranging multiple single batteries on one side of the first heat-conducting member 1; placing the second heat-conducting member 2 on the other side of the single battery 3 and applying colloid on one side of the second heat-conducting member 2 or the single battery 3 so that the two are bonded together, and then fixing the second heat-conducting member 2 to the housing so that the first heat-conducting member 1 and the second heat-conducting member 2 are sandwiched between the two sides of the multiple single batteries 3; and fixing the single batteries 3 to the first heat-conducting member 1 and the second heat-conducting member 2 via the colloid.

[0069] The above two assembly process embodiments are only examples, and this application does not limit the assembly process.

[0070] Refer to the following Figure 5 The principle of the first heat conducting member 1 and the second heat conducting member 2 limiting the position of the single battery 3 is described below. Figure 5 yes Figure 3 The diagram shows a single battery 3 being restricted in position in the battery pack embodiment.

[0071] For ease of description, the figure shows a first predetermined direction F1 and a second predetermined direction F2. The first predetermined direction F1 is perpendicular to the first plate 4 attached to the single battery 3. The second predetermined direction F2 is parallel to the first plate 4 attached to the single battery 3.

[0072] First, when the cells 3 tend to move in the second direction Y, for example, during vehicle acceleration or deceleration, the cells 3 experience acceleration in the second direction Y. Because the first and second plates 4 and 5 are arranged at an angle relative to the second direction Y, the second plates 5 block the cells 3 in the second direction Y. Consequently, the blocking action of the first and second plates 4 and 5 prevents the cells 3 from moving in the second direction Y or in its opposite direction, thereby reducing the risk of adjacent cells 3 being squeezed in the second direction Y. In this section, the first and second plates 4 and 5 refer to the cells 3 connected to them.

[0073] Second, when a battery pack is subjected to a severe impact, the individual cells 3 may move parallel to the bonding surface. In this case, the adhesive securing the individual cells 3 may fail (the individual cells 3 may become debonded, i.e., the adhesive may crack) or may not fail (the adhesive is elastic and deforms within a certain range). Specifically, due to the obstruction of the first and second plates 4 and 5, the individual cells 3 cannot move in the first predetermined direction F1. However, the individual cells 3 may move relative to the first and second plates 4 and 5 in the second predetermined direction F2 or its opposite direction.

[0074] If the single battery 3 moves along the second predetermined direction F2, it will be hindered by the first connection points P1 of the two adjacent first plates 4. If the single battery 3 moves in the opposite direction of the second predetermined direction F2, it will be hindered by the second connection points P2 of the two adjacent second plates 5. In other words, in the second predetermined direction F2, the single battery 3 is confined between the first connection point P1 and the second connection point P2. This reduces the space for the single battery 3 to move relative to the first heat conducting member 1 or the second heat conducting member 2 in a direction parallel to the bonding surface.

[0075] If the single battery 3 has room to move relative to the first heat conducting member 1 or the second heat conducting member 2 in a direction parallel to the bonding surface, there is a risk of the single battery 3 becoming debonded. To eliminate this risk, the single battery 3 is further prevented from moving relative to the first heat conducting member 1 or the second heat conducting member 2 in a direction parallel to the bonding surface. To this end, the single battery 3 can also be kept in contact with the first connection point P1 and the second connection point P2.

[0076] The following takes two different shapes of single cells 3 as an example to specifically describe how the single cells 3 always abut against the first connection point P1 and the second connection point P2 in a battery pack using the two shapes of single cells 3 .

[0077] Please continue reading Figure 5 In some embodiments, a first arcuate transition section 12 is provided between adjacent first plates 4. The first plates 4 are tangentially connected to the first arcuate transition section 12, forming a first tangent line 13. The first side surface 7 extends to meet the first tangent line 13. The dotted line in the figure indicates the range of the first arcuate transition section 12.

[0078] Similarly, a second arcuate transition section 14 is provided between adjacent second plates 5. The second plates 5 are tangentially connected to the second arcuate transition section 14 to form a second tangent line 15. The second side surface 8 extends to meet the second tangent line 15. The dotted line in the figure indicates the range of the second arcuate transition section 14.

[0079] like Figure 4 As shown, there are process fillets between the first side 7 and the third side 10, and between the second side 8 and the fourth side 11 of the single battery 3. Figure 5 In the figure, the process fillet is not drawn to clearly illustrate the connection between the first side surface 7 and the first tangent line 13 and the connection between the second side surface 8 and the second tangent line 15. If a process fillet exists, the tangent line between the first side surface 7 and the process fillet should connect to the first tangent line 13, and the tangent line between the second side surface 8 and the process fillet should connect to the second tangent line 15.

[0080] The first arcuate transition section 12 and the second arcuate transition section 14 respectively abut against the single battery 3 from both sides of the second predetermined direction F2. Therefore, the single battery 3 has no space to move relative to the first heat conducting member 1 or the second heat conducting member 2 in a direction parallel to the bonding surface.

[0081] In addition, by providing the first arc-shaped transition section 12 and the second arc-shaped transition section 14, it is also convenient to better manufacture the first heat-conducting member 1 and the second heat-conducting member 2, that is, the first heat-conducting member 1 is directly formed by bending an integral plate, and the first arc-shaped transition section 12 is formed at the bending point, and the second heat-conducting member 2 is directly formed by bending another integral plate, and the second arc-shaped transition section 14 is formed at the bending point, thereby reducing manufacturing costs.

[0082] See also Figures 6 to 8 , Figure 6 This is an exploded diagram of another embodiment of the battery pack of the present application. Figure 7 yes Figure 6 The schematic diagram of the structure of the single cell 3 in the battery pack embodiment shown is as follows, Figure 8 yes Figure 6 Schematic diagram showing a single battery 3 in a battery pack being restricted.

[0083] In some embodiments, the battery cell 3 includes a first side surface 7 and a second side surface 8 disposed opposite each other, as well as a third side surface 10 and a fourth side surface 11 disposed opposite each other. The first side surface 7, the third side surface 10, the second side surface 8, and the fourth side surface 11 are sequentially connected end to end. The first side surface 7 and the second side surface 8 are a pair of parallel planes. The third side surface 10 and the fourth side surface 11 are a pair of parallel planes. The third side surface 10 is inclined relative to the first side surface 7. A fourth angle G is formed between the third side surface 10 and the first side surface 7. In some embodiments, D is half of the first angle A.

[0084] A single battery cell 3 is housed within the first storage space 6. For two adjacent single batteries 3, the third side surface 10 of one is parallel to the fourth side surface 11 of the other. A fourth angle G is formed between the first side surface 7 and the third side surface 10. The radian of the fourth angle G is γrad, satisfying the following conditions: 0 < γ < π / 2, or π / 2 < γ < π. In this embodiment, the third side surface 10 is tightly aligned with the fourth side surface 11 of the other. In other embodiments, the third side surface 10 and the fourth side surface 11 of the other may be spaced apart or connected by other structures. In this embodiment, the projection of the single battery cell 3 in the height direction is a parallelogram.

[0085] Figure 6 The battery pack of another embodiment shown is Figure 3 The battery pack shown can improve the space utilization of the battery pack.

[0086] There is no arc-shaped transition section between two adjacent first plates 4, and the two first plates 4 form a first intersection line at the first connection point P1. In this embodiment, the first side surface 7 extends to connect with the first intersection line.

[0087] Similarly, there is no curved transition section between two adjacent second plates 5 , and the two second plates 5 form a second intersection line at the second connection point P2. The second side surface 8 extends to meet the second intersection line. This embodiment also ensures that the single battery cells 3 have no space to move relative to the first and second heat-conducting members 1 and 2 in a direction parallel to the bonding surface.

[0088] The radians of the first angle A and the second angle B determine the arrangement of the single cells 3. When the radian is smaller, the misalignment effect of the arrangement of the single cells 3 is more obvious. The first connection point P1 and the second connection point P2 can better limit the position of the single cell 3 located therebetween, thereby achieving a clamping and fixing effect on the single cell 3. This can reduce the amount of structural parts or colloids used to fix the single cell 3, thereby reducing the generation of such costs.

[0089] See also Figure 9 , Figure 9 It is a structural diagram of another embodiment of the battery pack of the present application.

[0090] In some embodiments, there are multiple first heat conducting members 1 and multiple second heat conducting members 2 , which are alternately arranged along the first direction X, and multiple single batteries 3 are sandwiched between adjacent first heat conducting members 1 and second heat conducting members 2 .

[0091] Figure 9 In the illustrated battery pack embodiment, fluid, such as coolant, is contained inside the first heat conducting member 1 and the second heat conducting member 2 to transfer heat more quickly.

[0092] Specifically, the first heat-conducting member 1 is provided with a first flow channel (not visible in the figure), and the second heat-conducting member 2 is provided with a second flow channel (not visible in the figure). Adjacent first and second heat-conducting members 1 and 2 are connected at one end along the second direction Y by a connector 18. The other ends of the first and second heat-conducting members are provided with a liquid inlet 16 and a liquid outlet 17, respectively. A third flow channel is provided within the connector 18, connecting the first and second flow channels. In other embodiments, two adjacent first heat-conducting members 1 and a second heat-conducting member 2 therebetween are connected by two connecting members 18, and the two connecting members 18 are respectively located at both ends of the second direction Y, respectively connecting the adjacent first heat-conducting members 1 and the second heat-conducting members 2, and the free ends of the two first heat-conducting members 1 are respectively provided with a liquid inlet 16 and a liquid outlet 17, so that the two first heat-conducting members 1 and the one second heat-conducting member 2 form a complete liquid-cooling channel; of course, other numbers of first heat-conducting members 1 and second heat-conducting members 2 can be connected together by connecting members 18 as needed to form a complete liquid-cooling channel, so as to reduce the setting of the liquid inlet 16 and the liquid outlet 17, thereby reducing costs, and examples will not be given one by one here.

[0093] The first heat conducting member 1 , the second heat conducting member 2 and the connecting member 18 may be manufactured in one piece.

[0094] The inventors discovered in their research that, given the same power demand, the corresponding battery pack envelope dimensions vary depending on the vehicle body space requirements. Traditional battery pack designs have a relatively regular internal layout, making it difficult to adapt to different customer needs. In the above-described embodiment, the envelope dimensions can be adapted to different requirements by adjusting the first angle A and the second angle B. Specifically, assuming the number of battery cells 3 and power demand remain unchanged, as the first angle A increases, the battery pack's first dimension (X) decreases and its second dimension (Y) increases. Conversely, as the first angle A decreases, the battery pack's first dimension (X) increases and its second dimension (Y) decreases.

[0095] The above details how the shapes of the first and second heat-conducting members 1 and 2 (liquid cooling plates) are modified to achieve triple positioning of the individual cells 3. This reduces the probability of the individual cells 3 moving relative to the first and second heat-conducting members 1 and 2 within the first accommodation space 6. This physical structure and colloid connection secure the individual cells 3 throughout the battery pack's lifecycle, minimizing the risk of failure and potential safety hazards, thereby enhancing the safety and reliability of the battery pack.

[0096] The following introduces Figure 3 Another aspect of the battery pack embodiment shown is to facilitate the removal of the single battery cells 3 .

[0097] In the existing technology, battery packs using CTP technology are often difficult to disassemble and repair, resulting in very expensive repair costs when problems occur in the single cell battery 3. The battery pack often needs to be directly replaced, and in the later stage of the battery pack's life, it is impossible to achieve effective cascade utilization, which has a very adverse impact on resource utilization and the environment.

[0098] Figure 3 The battery pack shown can also facilitate the removal of the single battery cells 3 to facilitate the repair of the battery pack or the recycling of the battery pack.

[0099] See also Figure 3 and Figure 10 , Figure 10 yes Figure 3 An enlarged view of a detail view in .

[0100] In some embodiments, a single battery cell 3 is provided within the first storage space 6. Specifically, each first storage space 6 contains only one single battery cell 3. Two adjacent single batteries 3 abut each other. The single batteries 3 also include a third side surface 10 and a fourth side surface 11 disposed opposite each other. A third angle C is defined between the third side surface 10 of one adjacent single battery cell 3 and the fourth side surface 11 of the other adjacent single battery cell 3. Furthermore, a second storage space 19 is defined between the third side surface 10 of one adjacent single battery cell 3 and the fourth side surface 11 of the other adjacent single battery cell 3, and the first heat conducting member 1 or the second heat conducting member 2. In this embodiment, the openings of the two adjacent third angles C face opposite directions.

[0101] In this embodiment, the radian of the third angle C is βrad, which satisfies: β+α1=π.

[0102] The second storage space 19 allows for the removal and installation of individual batteries 3. In one application scenario, if a single battery 3 is damaged, it can be removed through the adjacent second storage space 19. In another application scenario, if the battery pack has aged and is no longer functioning properly after a long period of use, the individual batteries 3 can be disassembled through the second storage space 19 for recycling. The disassembled batteries 3 can then be used in less demanding charging and discharging applications.

[0103] In some embodiments, the second accommodation space 19 is filled with a filler, and the filler may be at least one of a buffer structure, a heat-conducting structure, a heat-insulating structure, and an insulating structure.

[0104] Specifically, the buffer structure may be foam, which plays a buffering and protective role for two adjacent single batteries 3 .

[0105] Specifically, the heat-conducting structure enables better heat exchange between the single battery 3 and the first heat-conducting member 1 and the second heat-conducting member 2. In one application scenario, the heat-conducting structure cools the third side 10 and the fourth side 11 of the single battery 3, further increasing the heat dissipation area of ​​the single battery 3 and enhancing the heat dissipation effect.

[0106] Specifically, the thermal insulation structure can be thermal insulation cotton. When high-energy-density single cells 3 experience thermal runaway, their heat is transferred to surrounding single cells 3, leading to a chain reaction of thermal runaway. To prevent this heat spread, adding a thermal insulation structure between the single cells 3 can hinder heat transfer. During this period, more heat is removed by the first and second thermal conductors 1 and 2, thereby controlling the heat spread.

[0107] Specifically, the insulating structure plays the role of insulating and protecting between the single battery and the first heat conducting member 1 and the second heat conducting member 2 , thereby increasing safety.

[0108] In the case where the second receiving space 19 is filled with a filler, the filler can be removed by chemical degradation or physical destruction.

[0109] In some embodiments, the distance between the first side surface 7 and the second side surface 8 is D mm, the first angle A is equal to the second angle B, the radian of the first angle A is α1rad, and the following relationship is satisfied: 3≤D / α1≤100, in other embodiments, 12≤D / α1≤85; preferably, 25≤D / α1≤70; or, more preferably, 40≤D / α1≤60.

[0110] If D / α1 is less than 3, the second accommodating space 19 is too small to effectively handle the filler within. Furthermore, due to the tilt angle between the single cell 3 and the first and second thermally conductive members 1 and 2, the stress on the single cell 3 cannot be effectively resolved, requiring a higher level of colloid between the single cell 3 and the first and second thermally conductive members 1 and 2. If D / α1 is greater than 100, the second accommodating space 19 is too large, reducing the energy density and volume utilization of the battery pack. Within the range of 3 to 100, the size of the second accommodating space 19 meets operational requirements while allowing the first and second thermally conductive members 1 and 2 to bear some of the stress on the conduction of the single cell 3. This helps to clamp and secure the single cell 3 while reducing the requirements and amount of colloid, thereby reducing the risk of colloid failure.

[0111] See also Figure 1 and Figure 4 .

[0112] In some embodiments, the first area of ​​the first side 7 is S1 cm 2 , the first flow channel sequentially passes through multiple first plates 4, and the dimension in the thickness direction of the first plate 4 is K1 cm, satisfying: 6≤S1 / K1≤6500, in some embodiments, 18≤S1 / K1≤6000; in other embodiments, 60≤S1 / K1≤5500; preferably, 100≤S1 / K1≤4500. In some embodiments, 20≤S1≤1300. In other embodiments, 30≤S1≤700, preferably, 50≤S1≤500. The dimension of the first flow channel in the thickness direction of the first plate 4 can be understood as the maximum cavity diameter in the thickness direction of the first plate 4. In some embodiments, if the cross-section of the first flow channel is circular, the diameter of the circle is K1 cm.

[0113] If S1 / K1 is less than 6, S1 is small and K1 is large. During the charging and discharging process, the single battery 3 generates a lot of heat. At this time, the first side surface 7 of the single battery 3 is small, limiting the contact area between the first side surface 7 and the first plate 4, thus affecting the heat exchange performance with the first plate 4.

[0114] If S1 / K1 is greater than 6500, S1 is large and K1 is small. Although the area available for heat exchange is large, the relatively small space within the first plate 4 for the medium used for heat management circulation increases the flow resistance of the medium. In this case, the heat exchange capacity of the first plate 4 is limited and cannot meet the heat exchange requirements of the single battery 3.

[0115] In some embodiments of the present application, the second area of ​​the second side 8 is S2cm 2The second flow channel sequentially passes through the plurality of second plates 5 , and has a dimension K2 cm in the thickness direction of the second plate 5 , satisfying the following: 6 ≤ S2 / K2 ≤ 6500. In some embodiments, 18 ≤ S2 / K2 ≤ 6000; in other embodiments, 60 ≤ S2 / K2 ≤ 5500; preferably, 100 ≤ S2 / K2 ≤ 4500. In some embodiments, 20 ≤ S2 ≤ 1300. In other embodiments, 30 ≤ S2 ≤ 700; preferably, 50 ≤ S2 ≤ 500.

[0116] The reason for limiting the range of S2 / K2 in this way is the same as the reason for limiting the range of S1 / K1, and will not be repeated here.

[0117] In some embodiments, the bonding structure includes a first bonding layer. The first side surface 7 is bonded to the first plate 4 via the first bonding layer (not visible in the figure). The first area of ​​the first side surface 7 is S1 cm 2 The elastic modulus of the first adhesive layer is E1 MPa, satisfying the following: 0.02 ≤ S1 / E1 ≤ 13. In some embodiments, 0.06 ≤ S1 / E1 ≤ 10. In other embodiments, 0.1 ≤ S1 / E1 ≤ 8, preferably 0.15 ≤ S1 / E1 ≤ 6. In some embodiments, 100 ≤ E1 ≤ 1000. In other embodiments, 140 ≤ E1 ≤ 830, preferably 200 ≤ E1 ≤ 650.

[0118] If S1 / E1 < 0.02, then S1 is small and E1 is large. When a cell 3 expands due to its own charge and discharge processes or is subjected to external forces, the small S1 limits the deformation capacity of the cell 3 due to its area. The large E1 further restricts the deformation of the first side surface 7 of the cell 3. In this case, the deformation of the first side surface 7 is limited, resulting in a large reaction force within the cell 3, damaging the internal structure of the cell 3 and affecting its subsequent performance.

[0119] If S1 / E1>13, then S1 is larger and E1 is smaller. When the single cell 3 expands or is disturbed by external forces, due to the larger S1, the first side surface 7 of the single cell 3 is easily deformed, and the height difference between the middle area and the edge area of ​​the first side surface 7 is larger. However, due to the smaller E1, the first adhesive layer cannot effectively limit the deformation of the first side surface 7 of the single cell 3, resulting in an excessively large height difference between the middle area and the edge area of ​​the first side surface 7. The portion where the first adhesive layer contacts the edge area of ​​the first side surface 7 is more susceptible to stretching. During the stretching process, the first adhesive layer can easily separate from the connection portion of the single cell 3 or even the entire first side surface 7, thereby causing the risk of the single cell 3 separating from the first plate 4.

[0120] In some embodiments, the bonding structure includes a second bonding layer. The second side surface 8 is bonded to the second plate 5 via the second bonding layer, and the second area of ​​the second side surface 8 is S2 cm 2 The elastic modulus of the second adhesive layer is E2 MPa, satisfying: 0.02 ≤ S2 / E2 ≤ 13. In some embodiments, 0.06 ≤ S2 / E2 ≤ 10. In other embodiments, 0.1 ≤ S2 / E2 ≤ 8, preferably 0.15 ≤ S2 / E2 ≤ 6. In some embodiments, 100 ≤ E2 ≤ 1000. In other embodiments, 140 ≤ E2 ≤ 830, preferably 200 ≤ E2 ≤ 650.

[0121] The reasons for limiting the scope of S2 / E2 are the same as those for limiting the scope of S1 / E1, and will not be repeated here.

[0122] In summary, the battery pack of the present application improves the connection reliability of the single cells in the battery pack.

[0123] The battery pack of the present application reduces the space for the single battery to move relative to the first heat conductive member or the second heat conductive member in a direction parallel to the bonding surface, and even avoids the single battery from moving relative to the first heat conductive member or the second heat conductive member in a direction parallel to the bonding surface.

[0124] The first heat conducting member 1 and the second heat conducting member 2 of the wave configuration cannot move the single battery at the corners, thereby fixing the single battery and reducing the loss of other components and materials required for fixing the single battery.

[0125] The first heat conductor 1 and the second heat conductor 2 can replace the beam structure in the battery pack to guide and support the single battery cells, reduce the types and number of components in the battery pack, realize functional integration, reduce the cost of the battery pack, and achieve the effect of lightweighting the battery pack.

[0126] The first heat conducting member 1 and the second heat conducting member 2 have an excellent cooling effect on the single battery. Cooling over a large area can improve the heat dissipation effect of the single battery, further enhance the temperature control effect, and play a control role when the single battery is thermally runaway, reducing or even avoiding the occurrence of heat spread.

[0127] The second storage space of the traditional square battery can be effectively utilized to place the corresponding thermal insulation parts to improve the thermal safety of the battery pack; in addition, the second storage space can become a detachable breakthrough point for the battery pack, and the heat dissipation material, heat insulation material or insulating material controlled and filled here can all be destroyed from here, thereby realizing the disassembly of the single battery and the first heat conductive part 1 and the second heat conductive part 2 in the battery pack, avoiding damage to the single battery, causing safety hazards, and improving the recovery rate of the single battery.

[0128] Due to the inclined structure of the single battery cell, the length and width of the entire battery module can be adjusted according to the size changes of the first angle and the second angle to achieve compatibility with different battery pack sizes, and the corresponding first heat conductive member 1 and the second heat conductive member 2 only need to be adjusted to the corresponding fitting angle to achieve the effect of meeting the requirements of different envelope sizes.

[0129] The above steps are merely provided to help understand the method, structure, and core concept of the present application. A person skilled in the art may make several improvements and modifications to the present application without departing from the principles of the present application, and such improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A battery pack, characterized in that: include: a plurality of battery cells, each battery cell having a first side surface and a second side surface disposed opposite to each other; and A first heat conducting member and a second heat conducting member, wherein the first heat conducting member and the second heat conducting member are spaced apart along a first direction; the first heat conducting member comprises a plurality of first plates, the plurality of first plates are sequentially connected along a second direction, a first angle is formed between two adjacent first plates, the radian of the first angle is α1rad, and the following conditions are met: π / 2<α1<π; the second heat conducting member comprises a plurality of second plates, the plurality of second plates are sequentially connected along the second direction, a second angle is formed between two adjacent second plates, the radian of the second angle is α2rad, and the following conditions are met: π / 2<α2<π; wherein the first direction intersects the second direction; in at least part of the first plates and at least part of the second plates, each first plate and a second plate are arranged opposite to each other and form a first accommodation space; the first heat conducting member and the second heat conducting member are of a broken line type; At least one single battery is arranged in the first accommodation space, and the first side surface is connected to the first plate body, and the second side surface is connected to the second plate body; the first side surface and the second side surface are the surfaces with the largest surface area of ​​the single battery.

2. The battery pack according to claim 1, wherein: The first angle is equal to the second angle, and the distance between the first side surface and the second side surface is D mm, satisfying the following relationship: 3≤D / α1≤100.

3. The battery pack according to claim 1, wherein: A single cell is provided in the first accommodating space, and the first side surface and the second side surface are parallel to each other; the single cell further includes a third side surface and a fourth side surface that are arranged opposite to each other, the third side surface and the fourth side surface being parallel to each other, the first side surface, the third side surface, the second side surface and the fourth side surface being connected end to end in sequence, and the angle between the first side surface and the third side surface is 90°; for two adjacent single cells, a third angle is formed between the third side surface of one and the fourth side surface of the other, and a second accommodating space is enclosed between the third side surface of one and the fourth side surface of the other and the first heat conductive member or the second heat conductive member.

4. The battery pack according to claim 3, wherein: The radian of the third angle is βrad, which satisfies: β+α1=π.

5. The battery pack according to claim 1, wherein: A single battery is provided in the first accommodating space, the first side surface and the second side surface are parallel, the single battery further includes a third side surface and a fourth side surface arranged opposite to each other, the first side surface, the third side surface, the second side surface and the fourth side surface are connected end to end in sequence, the third side surface of one of two adjacent single batteries is parallel to the fourth side surface of the other, a fourth angle is formed between the first side surface and the third side surface, the radian of the fourth angle is γrad, and satisfies: 0<γ<π / 2, or π / 2<γ<π.

6. The battery pack according to claim 1, wherein: A first arc-shaped transition section is provided between adjacent first plates, the first plates are tangentially connected to the first arc-shaped transition section to form a first tangent line, and the first side surface extends to connect with the first tangent line; A second arc-shaped transition section is provided between adjacent second plates. The second plates are tangentially connected to the second arc-shaped transition section to form a second tangent line. The second side surface extends to connect with the second tangent line.

7. The battery pack according to claim 3, wherein: The second accommodation space is filled with at least one of a buffer structure, a heat conducting structure, a heat insulating structure and an insulating structure.

8. The battery pack according to claim 1, wherein: An adhesive structure is connected between the single battery and the first plate and / or the second plate.

9. The battery pack according to claim 1, wherein: The number of the first plates is at least three, and the first plates have a first surface and a second surface arranged opposite to each other, and the first surface is connected to the first side surface; among the at least three first plates connected in sequence, the two adjacent first surfaces at one end along the second direction form a fifth angle, and the two adjacent second surfaces at the other end form a sixth angle, and the radian of the fifth angle is equal to that of the sixth angle.

10. The battery pack according to claim 1, wherein: There are plural first heat conducting members and plural second heat conducting members, which are alternately arranged along a first direction, and plural single cells are sandwiched between adjacent first heat conducting members and adjacent second heat conducting members.

11. The battery pack according to claim 10, wherein: A first flow channel is provided in the first heat conducting member, and a second flow channel is provided in the second heat conducting member; At least partially adjacent to the first heat conducting member and the second heat conducting member, at one end along the second direction, the first heat conducting member and the second heat conducting member are connected by a connecting member, a third flow channel is provided in the connecting member, and the third flow channel connects the first flow channel and the second flow channel.

12. The battery pack according to claim 11, wherein: The first area of ​​the first side is S1 cm 2 , the first flow channel sequentially penetrates the plurality of first plates along the extension direction of the first heat conducting member, and the dimension of the first flow channel in the thickness direction of the first plate is K1 cm, satisfying: 6≤S1 / K1≤6500; and / or, The second area of ​​the second side is S2cm 2 The second flow channel passes through the plurality of second plates in sequence along the extension direction of the second heat conducting member, and the dimension of the second flow channel in the thickness direction of the second plate is K2 cm, satisfying: 6≤S2 / K2≤6500.

13. The battery pack according to claim 8, wherein: The bonding structure includes a first bonding layer, the first side is bonded to the first plate through the first bonding layer, and the first area of ​​the first side is S1cm 2 , the elastic modulus of the first adhesive layer is E1 MPa, satisfying: 0.02≤S1 / E1≤13; and / or, The bonding structure includes a second bonding layer, the second side is bonded to the second plate through the second bonding layer, and the second area of ​​the second side is S2cm 2 , the elastic modulus of the second adhesive layer is E2 MPa, satisfying: 0.02≤S2 / E2≤13.

14. A vehicle, characterized in that: A battery pack comprising any one of claims 1 to 13.

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