Battery pack and electric device

Abstract

The utility model relates to a battery pack and an electric device, and the battery pack comprises a tray which is provided with an accommodating cavity; the battery monomer group is provided with a plurality of battery monomers, the battery monomer group is mounted in the accommodating cavity, and a gap is formed between the battery monomer at at least one end part of the battery monomer group and the side wall of the accommodating cavity; the wedge-shaped block is provided with a wedge-shaped surface, and an inclined surface is formed on the side wall of the accommodating cavity; the wedge-shaped block is at least partially filled into the gap in an operable manner so as to be clamped between the inclined surface and the battery monomer, and the inclined surface is connected and matched with the wedge-shaped surface; a first limiting part is arranged on the wedge-shaped face, a second limiting part is arranged on the inclined face, and the first limiting part and the second limiting part are matched in a limiting mode to limit the wedge-shaped block to slide out of the gap. Compared with the prior art that a gap between the single battery and the inner wall of the tray cannot be completely filled with a supporting plate, the wedge-shaped block can provide large-area constraint and support for the single battery, can limit outward expansion of the single battery, and ensures the effect that the single battery is locked on the tray.

Description

Technical Field

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

[0002] With the rapid expansion and development of the new energy market, the market share of new energy vehicles has gradually increased. As a result, the development of power batteries, the core component of new energy vehicles, has become an increasingly critical factor.

[0003] When battery cells are placed in a tray, especially for module-free battery packs, a certain gap is left between the battery cells and the inner wall of the tray, and the support plate fills this gap. However, the support plate cannot provide sufficient restraint force, and thus cannot prevent the outermost battery cells from expanding outward, which affects the performance of the battery pack. Utility Model Content

[0004] Based on this, it is necessary to provide a battery pack and an electrical device that can provide a greater restraining force to limit the outward expansion of the battery cells in order to address the problem that the traditional support plate cannot provide a greater restraining force to limit the outward expansion of the battery cells.

[0005] A battery pack, comprising:

[0006] A tray having a receiving cavity;

[0007] A battery cell group having a plurality of battery cells, wherein the battery cell group is installed in the accommodating cavity, and a gap is formed between the battery cells at at least one end of the battery cell group and the side wall of the accommodating cavity;

[0008] A wedge-shaped block having a wedge-shaped surface, and an inclined surface is formed on the side wall of the accommodating cavity; the wedge-shaped block is operable to at least partially fill the gap to be sandwiched between the inclined surface and the battery cell, and the inclined surface is in contact with and adapted to the wedge-shaped surface;

[0009] A first limiting portion is provided on the wedge surface, and a second limiting portion is provided on the inclined surface. The first limiting portion cooperates with the second limiting portion to limit the wedge block from sliding out of the gap.

[0010] In one embodiment, the first limiting portion is a first rack protruding from the wedge surface, and the second limiting portion is a second rack protruding from the inclined surface. The teeth of the first rack and the second rack engage with each other to limit the wedge block from sliding out of the gap.

[0011] In one embodiment, the second teeth of the second rack extend toward the bottom wall of the accommodating cavity, and the extending direction of the first teeth of the first rack is opposite to the extending direction of the second teeth of the second rack;

[0012] or

[0013] The second teeth of the second rack extend toward the opening of the accommodating cavity, and the extending direction of the first teeth of the first rack is opposite to the extending direction of the second teeth of the second rack.

[0014] In one embodiment, there is a gap between the battery cells at both ends of the battery cell group and the sidewalls of the accommodating cavity, and the gap at each end is filled with the wedge-shaped block;

[0015] The second teeth of the second rack corresponding to the wedge block at at least one end extend toward the opening of the accommodating cavity, and the extending direction of the first teeth of the first rack is opposite to the extending direction of the second teeth of the second rack.

[0016] In one embodiment, the battery pack further includes a heat-insulating member, which is sandwiched between the wedge-shaped block and the battery cell and / or between the wedge-shaped block and the tray.

[0017] In one embodiment, the battery pack further includes a limiting member connected to the tray and configured to abut against the wedge-shaped block;

[0018] The position of the limiting member on the tray is adjustable, so that when the wedge-shaped block fills the gap to different filling depths, it can abut against the wedge-shaped block to limit the wedge-shaped block from sliding out of the gap.

[0019] In one embodiment, the battery pack further includes a connecting plate, which is detachably connected to the tray. The limiting member is a limiting screw, which is installed on the connecting plate in an adjustable position. The limiting screw is used to abut against the wedge block to limit the wedge block from sliding out of the gap.

[0020] In one embodiment, the tray includes a tray body and a partition plate, the tray body has an inner cavity, the partition plate is connected to the tray body and divides the inner cavity to form a plurality of the accommodating cavities;

[0021] There is a gap between the battery cell located at at least one end of each accommodating cavity and the side wall of the accommodating cavity, and the wedge-shaped block is filled in the gap.

[0022] In one embodiment, the battery pack further includes a thin sheet pressure sensor, which is sandwiched between the battery cell and the tray and / or sandwiched between two adjacent battery cells.

[0023] An electrical device includes the battery pack as described above.

[0024] In the above-mentioned battery pack and electrical device, the wedge block can be operably filled into the gap between the battery cell and the side wall of the accommodating cavity. When the wedge block is filled into the gap, it can be clamped between the inclined surface and the battery cell. That is, the filling depth of the wedge block into the gap can ensure close contact with the large surface of the battery cell, providing the battery cell with an appropriate amount of support force. It can be seen that the wedge block can completely fill the gap between the battery cell and the inner wall of the tray. Compared with the situation in the technology where the support plate cannot completely fill the gap between the battery cell and the inner wall of the tray, the setting of the wedge block can provide large-surface constraint and support for the battery cell, which can limit the outward expansion of the battery cell and ensure the performance of the battery pack. At the same time, when the wedge block fills the gap to the appropriate depth, the first limiting portion and the second limiting portion cooperate to limit the wedge block from sliding out of the gap, ensuring that the wedge block can stably support the battery cell, ensuring the effect of locking the battery cell on the tray, and improving the performance of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A structural diagram of a battery pack provided in one embodiment of the present application;

[0026] Figure 2 A structural diagram showing the use of a pressing mechanism to press the wedge block downward along Z into the gap;

[0027] Figure 3 for Figure 1 The structure diagram of the battery pack from another perspective shown in FIG;

[0028] Figure 4 for Figure 3 An enlarged view of point A of the battery pack shown in FIG;

[0029] Figure 5 for Figure 1 A cross-sectional view of the battery pack shown in ;

[0030] Figure 6 for Figure 5 An enlarged view of point B of the battery pack shown in FIG;

[0031] Figure 7 A diagram illustrating the engagement between first teeth on wedge-shaped blocks at both ends of a battery cell group of a battery pack provided by another embodiment of the present application and second teeth on a tray;

[0032] Figure 8 for Figure 1 A structural diagram of a wedge-shaped block of a battery pack shown in ;

[0033] Figure 9 It is a structural diagram of a downward pressing mechanism;

[0034] Figure 10 for Figure 1The battery pack shown in the figure hides some of the battery cells.

[0035] Description of reference numerals:

[0036] 100. Battery pack; 10. Tray; 11. Receiving cavity; 111. Side wall; 112. Bottom wall; 113. Opening; 114. Inclined surface; 12. Disc; 13. Partition plate; 20. Battery cell; 30. Gap; 40. Wedge block; 41. Wedge surface; 50. First rack; 51. First tooth; 60. Second rack; 61. Second tooth; 611. Inner surface; 612. Outer surface; 70. Insulation component; 80. Limiting component; 90. Connecting plate; 110. Sheet pressure sensor; 200. Pressing mechanism; 201. Avoidance groove. DETAILED DESCRIPTION

[0037] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0040] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0041] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0042] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0043] As described in the background technology, in traditional technology, the support plate is difficult to provide a large restraining force, and thus cannot limit the outward expansion of the outermost battery cells, which affects the performance of the battery pack. When the support plate cannot limit the outward expansion of the outermost battery cells, it will at least lead to the following problems: affecting the charge and discharge cycle life of the battery cells. As the number of cycles increases, the expansion force of the battery cells becomes greater and greater, and the shear force on the upper and lower adhesive layers becomes greater and greater. After experiencing long-term harsh working conditions, once the adhesive fails and the battery cells lack restraint, the internal structure of the battery pack may be damaged, posing a safety risk.

[0044] The applicant's research found that the root cause of the above problems is that when the battery cells are placed in the tray, especially for module-free battery packs (CTP batteries, that is, battery cells are directly integrated into the battery pack, eliminating the intermediate module link), due to the battery cell size tolerance, battery cell stacking tolerance, the existence of the tray tolerance and the process limitations of the battery cell into the tray, a certain gap needs to be reserved between the battery cells and the inner wall of the tray when the battery cells are placed in the tray, so as to facilitate the smooth loading of the battery cells into the tray. However, due to the large actual gap tolerance, in order to avoid the problem of battery cells being unable to be loaded into the tray, the thickness of the support plate can only be designed according to the lower tolerance of the gap. As a result, in most cases, the installed support plate cannot completely fill the gap between the battery cell and the inner wall of the tray. The support for the large surface of the battery cell is insufficient, and the support plate is difficult to provide a large restraining force, which in turn cannot limit the outward expansion of the battery cell, affecting the performance of the battery pack.

[0045] For the above questions, see Figure 1 and Figure 2 An embodiment of the present application provides a battery pack 100, comprising a tray 10 and a battery cell group, wherein the battery cell group comprises a plurality of battery cells 20. The tray 10 has a receiving cavity 11, and the battery cell group is mounted in the receiving cavity 11. In one example, the tray 10, serving as a box for mounting the battery cells 20, is a flat structure. Of course, in other embodiments, the shape of the tray 10 is not limited.

[0046] Optionally, continue to Figure 1 and Figure 2 Each battery cell group includes multiple rows of battery cells 20 arranged along a first direction, and each row of battery cells 20 includes multiple battery cells 20 arranged along a second direction. Alternatively, each battery cell group includes a row of battery cells 20 arranged along the first direction, and the row of battery cells 20 includes multiple battery cells 20 arranged along the second direction. The multiple battery cells 20 in the battery cell group can be connected in series, in parallel, or in a mixed series. Figure 1 The Y direction is the first direction, and the X direction is the second direction.

[0047] In one example, the battery cell 20 includes a housing, an electrode assembly contained within the housing, and an electrolyte. The electrode assembly typically includes a positive electrode sheet, a negative electrode sheet, and a separator separating the positive and negative electrode sheets. The electrode assembly can be wound or laminated.

[0048] For further information, see Figure 3 and Figure 4A gap 30 is provided between the battery cell 20 at at least one end of the battery cell group and the side wall 111 of the accommodating cavity 11. Specifically, a gap 30 is provided between the battery cell 20 at at least one end of the battery cell group in the second direction and the side wall 111 of the accommodating cavity 11. By providing this gap 30, it is possible to facilitate the smooth loading of the battery cell group into the accommodating cavity 11 of the tray 10. Generally, the large surfaces of the battery cells 20 are located at the two ends of the battery cell 20 in the second direction. There is a gap 30 between the large surfaces of the battery cells 20 at the two ends of the battery cell group in the second direction and the side wall 111 of the accommodating cavity 11. By controlling the two ends, the tolerance range between the battery cell group and the side wall 111 is expanded, thereby avoiding interference between the two ends of the battery cell group and the tray 10, and facilitating the loading of the battery cell group into the tray 10.

[0049] The battery pack 100 also includes a wedge block 40, which has a wedge-shaped surface 41. An inclined surface 114 is formed on the side wall 111 of the accommodating cavity 11, and a wedge-shaped gap 30 is formed between the inclined surface 114 and the battery cell 20. The wedge block 40 is operable to fill the gap 30 along the Z direction in the figure. Optionally, the wedge block 40 can be partially filled into the gap 30, or can be completely filled into the gap 30 to ensure that the wedge block 40 is sandwiched between the inclined surface 114 and the battery cell 20. When the wedge block 40 is sandwiched between the inclined surface 114 and the battery cell 20, the wedge surface 41 is connected and adapted to the inclined surface 114. Specifically, the inclination angle of the inclined surface 114 is the same as the inclination angle of the wedge surface 41. In this way, when the wedge block 40 fills the gap 30, the inclined surface 114 and the wedge surface 41 can be connected. The wedge block 40 fills the gap 30 to a depth sufficient to ensure close contact between the wedge block 40 and the larger surface of the battery cell 20. When the wedge block 40 is in close contact with the larger surface of the battery cell 20, the inclined surface 114 abuts the wedge surface 41, allowing the wedge block 40 to squeeze the battery cell 20, providing large-surface restraint and support for the battery cell 20. This limits outward expansion of the battery cell 20 and ensures the performance of the battery pack 100.

[0050] To ensure close contact between the wedge block 40 and the larger surface of the battery cell 20, the side of the wedge block 40 closest to the battery cell 20 is a flat surface parallel to the larger surface of the battery cell 20. The wedge block 40 can be hollow to reduce weight. Of course, the wedge block 40 can also be solid to increase strength.

[0051] It should be noted that when gaps 30 are present between the battery cells 20 at both ends of the battery cell group in the second direction and the sidewalls 111 of the accommodating cavity 11, the wedge block 40 may be filled in the gap 30 at one end, or in the gaps 30 at both ends. Furthermore, when each battery cell group includes multiple rows of battery cells 20 in the first direction, a wedge block 40 may be provided for each row of battery cells 20, with the wedge block 40 filling the gap 30 formed by the sidewalls 111 of the accommodating cavity 11 for that row of battery cells 20. Alternatively, multiple rows of battery cells 20 may share a single wedge block 40, with the wedge block 40 filling the gap 30 formed by the multiple rows of battery cells 20 and the sidewalls 111 of the accommodating cavity 11.

[0052] A first stopper is provided on the wedge block 40, and a second stopper is provided on the inclined surface 114. The first stopper and the second stopper cooperate to prevent the wedge block 40 from sliding out of the gap 30. Specifically, when the wedge block 40 fills the gap 30 to the appropriate depth, the first stopper and the second stopper cooperate to prevent the wedge block 40 from sliding out of the gap 30 under the action of the expansion force, thereby ensuring stable restraint and support for the battery cell 20.

[0053] In the battery pack 100 provided in the embodiment of the present application, the wedge block 40 is operable to fill the gap 30 between the battery cell 20 and the side wall 111 of the accommodating cavity 11. After the wedge block 40 is filled into the gap 30, it can be sandwiched between the inclined surface 114 and the battery cell 20. That is, the filling depth of the wedge block 40 into the gap 30 can ensure close contact with the large surface of the battery cell 20, providing the battery cell 20 with an appropriate amount of support force. It can be seen that the wedge block 40 can completely fill the gap 30 between the battery cell 20 and the inner wall of the tray 10. Compared with the situation in the prior art where the support plate cannot completely fill the gap 30 between the battery cell 20 and the inner wall of the tray 10, the provision of the wedge block 40 can provide large-surface constraint and support for the battery cell 20, can limit the outward expansion of the battery cell 20, and ensure the performance of the battery pack 100. At the same time, when the wedge block 40 fills the gap 30 to an appropriate depth, the first limiting portion and the second limiting portion cooperate to limit the wedge block 40 from sliding out of the gap 30, ensuring that the wedge block 40 can stably support the battery cell 20, ensuring the battery cell 20 is locked on the tray 10, and improving the performance of the battery pack 100.

[0054] In some embodiments, see Figure 3The tray 10 includes a tray body 12 and a partition plate 13. The tray body 12 has an inner cavity. The partition plate 13 is connected to the tray body 12 and divides the inner cavity to form a plurality of accommodating chambers 11. In each accommodating chamber 11, a gap 30 is defined between the battery cell 20 located at at least one end thereof and the sidewall 111 of the accommodating chamber 11. The gap 30 is filled with a wedge-shaped block 40. That is, in this embodiment, the tray 10 has a plurality of accommodating chambers 11, each of which is provided with a battery cell group. In this way, the number of battery cells 20 in each accommodating chamber 11 is not too large, and the battery cells 20 can be stably fixed to the tray 10.

[0055] It is conceivable that in other embodiments, the number of the accommodating cavities 11 of the tray 10 is not limited. For example, the tray 10 may be provided with one accommodating cavity 11 .

[0056] In some embodiments, see Figure 5 and Figure 6 The first limiting portion is a first rack 50 protruding from the wedge surface 41, and the second limiting portion is a second rack 60 protruding from the inclined surface 114. The teeth of the first rack 50 and the second rack 60 engage with each other to prevent the wedge block 40 from sliding out of the gap 30. With this arrangement, during the process of filling the wedge block 40 into the gap 30, a force is applied to the wedge block 40 to overcome the resistance of the teeth of the second rack 60 against the teeth of the first rack 50, ultimately filling the wedge block 40 into the gap 30 to the appropriate depth. When the wedge block 40 has been filled into the gap 30 to the appropriate depth, the teeth of the first rack 50 and the second rack 60 engage with each other, preventing the wedge block 40 from sliding out of the gap 30, thereby ensuring that the wedge block 40 stably supports the battery cell 20. At the same time, since the teeth of the first rack 50 and the second rack 60 are engaged with each other, the contact area between the wedge block 40 and the side wall 111 of the accommodating cavity 11 is increased, thereby avoiding the situation where the contact area between the wedge block 40 and the side wall 111 of the accommodating cavity 11 is too small and the battery cell 20 is unstable.

[0057] It is worth noting that in other embodiments, the first limiting portion and the second limiting portion may be arranged in other ways to achieve cooperation between the two to prevent the wedge block 40 from sliding out of the gap 30. For example, in some embodiments, the first limiting portion and the second limiting portion each include a plurality of snap portions. When the wedge block 40 is filled into the gap 30, the first limiting portion engages with the corresponding snap portions of the second limiting portion, thereby preventing the wedge block 40 from sliding out of the gap 30.

[0058] In some embodiments, see Figure 1 The accommodating chamber 11 has a bottom wall 112 connected to the side wall 111 , and an opening 113 is formed at a portion of the accommodating chamber 11 facing the bottom wall 112 . The battery cell group is loaded into the accommodating chamber 11 through the opening 113 .

[0059] See Figure 7 , the second teeth 61 of the second rack 60 extend toward the bottom wall 112 of the accommodating chamber 11. That is, the second rack 60 has a tooth root and a tooth top, the tooth root is connected to the inclined surface 114, the tooth top is connected to the tooth root, and the tooth top extends relative to the tooth root toward the bottom wall 112 of the accommodating chamber 11. The extension direction of the first teeth 51 of the first rack 50 is opposite to the extension direction of the second teeth 61 of the second rack 60. Figure 8 , Figure 8 The extension direction of the second tooth 51 is Figure 7 The second teeth 61 on the left side extend in the opposite direction. In this way, when the first teeth 51 and the second teeth 61 are engaged, a large force is required to separate the first teeth 51 and the second teeth 61, which can achieve the effect of better limiting the wedge block 40 from sliding out of the gap 30.

[0060] Further, see Figure 7 The second tooth 61 has an inner surface 611 and an outer surface 612 connected to each other. The outer surface 612 is located near the opening 113 of the accommodating cavity 11, while the inner surface 611 is located away from the opening 113 of the accommodating cavity 11. Of two adjacent second teeth 61, the inner surface 611 of the outer second tooth 61 is connected to the outer surface 612 of the inner second tooth 61. A receiving groove is formed between the inner surface 611 of the outer second tooth 61 and the outer surface 612 of the inner second tooth 61. When the wedge block 40 fills the gap 30 to a predetermined depth, the first tooth 51 slides into the receiving groove. The inner surface 611 of the second tooth 61 forms a blocking surface for preventing the wedge block 40 from sliding out of the gap 30.

[0061] like Figure 7 As shown in the structure on the left side of the center, the inner surface 611 extends horizontally. This configuration facilitates the first tooth 51 to slide into the receiving groove, while the direction in which the wedge block 40 slides out of the gap 30 is perpendicular to the inner surface 611, thereby improving the blocking effect of the wedge block 40 from sliding out of the gap 30. Of course, in other embodiments, the configuration of the inner surface 611 is not limited, and for example, the inner surface 611 can be configured to be inclined at a certain angle relative to the horizontal plane.

[0062] The angle formed between the outer surface 612 and the inner surface 611 is an acute angle. When the wedge block 40 is filled into the gap 30, the outer surface 612 can serve as a guide surface for guiding the wedge block 40. Under the guiding action of the outer surface 612, the wedge block 40 is guided into the gap 30.

[0063] In other embodiments, Figure 7As shown in the structure on the right side of the middle, the second teeth 61 of the second rack 60 extend toward the opening 113 of the accommodating cavity 11, that is, the top of the second teeth 61 extends toward the opening 113 of the accommodating cavity 11 relative to the root of the tooth. The extension direction of the first teeth 51 of the first rack 50 is opposite to the extension direction of the second teeth 61 of the second rack 60. In this way, after the first teeth 51 and the second teeth 61 are engaged, the force separating the first teeth 51 and the second teeth 61 is small, and when the battery cell 20 expands, the wedge block 40 can move along the Figure 7 The wedge block 40 slides upward in the Z direction to adjust the support force provided to the battery cell 20. This method is more suitable for after-sales adjustment. It should be noted that in this embodiment, the engagement of the first teeth 51 and the second teeth 61 can also achieve the effect of limiting the wedge block 40 from sliding out of the gap 30.

[0064] Specifically, in this embodiment, the inner surface 611 and the outer surface 612 both extend toward the opening 113 relative to the inclined surface 114. In this way, while facilitating the first tooth 51 to slide into the accommodating groove, the direction in which the wedge block 40 slides out of the gap 30 is set at an acute angle to the inner surface 611, so as to facilitate adjusting the filling depth of the wedge block 40 in the gap 30 when installing the wedge block 40.

[0065] It should be understood that in other embodiments, the extension direction of the first teeth 51 and the second teeth 61 is not limited. The first teeth 51 and the second teeth 61 can be arranged in any manner as long as they can ensure that they can engage with each other to prevent the wedge block 40 from sliding out of the gap 30. For example, in some embodiments, the second teeth 61 and the first teeth 51 can both extend horizontally, that is, the extension direction of the second teeth 61 is parallel to the plane of the bottom wall 112.

[0066] In some embodiments, see Figure 7 Gaps 30 are defined between the battery cells 20 at both ends of the battery cell pack and the sidewalls 111 of the accommodating cavity 11. Wedge blocks 40 are filled in the gaps 30 at each end. The second teeth 61 of the second rack 60 corresponding to the wedge blocks 40 at at least one end extend toward the opening 113 of the accommodating cavity 11, and the first teeth 51 of the first rack 50 extend in the opposite direction to the second teeth 61 of the second rack 60. This facilitates adjusting the filling depth of the wedge blocks 40 in the gaps 30 when installing the wedge blocks 40 at at least one end, preventing the wedge blocks 40 from exerting excessive preload on the battery cells 20 and adversely affecting the battery cells 20.

[0067] It is understandable that in other embodiments, when there is a gap 30 between the battery cells 20 at both ends of the battery cell group and the side wall 111 of the accommodating cavity 11, and the gap 30 at each end is filled with a wedge block 40, the second teeth 61 of the second rack 60 corresponding to the wedge blocks 40 at both ends can also be set to extend toward the bottom wall 112, which is not limited here.

[0068] In some embodiments, see Figure 4 The battery pack 100 also includes a limiting member 80, which is connected to the tray 10 and is used to abut against the wedge block 40. The position of the limiting member 80 on the tray 10 is adjustable, so that when the wedge block 40 fills the gap 30 to different filling depths, the limiting member 80 can abut against the wedge block 40 to limit the wedge block 40 from sliding out of the gap 30. After the wedge block 40 is filled into the gap 30, the first limiting portion and the second limiting portion cooperate to limit the wedge block 40 from sliding out of the gap 30. At the same time, the limiting member 80 can also limit the wedge block 40. Under the dual limiting action, the wedge block 40 is limited from sliding out of the gap 30. In addition, the limiting member 80 abuts against the end face of the wedge block 40 away from the bottom wall 112 to prevent the wedge block 40 from being squeezed and deformed.

[0069] It is worth noting that, since the position between the stopper 80 and the tray 10 is adjustable, when the wedge block 40 needs to be installed in the gap 30, the stopper 80 is controlled to abut against the wedge block 40 to apply force to the wedge block 40 to press the wedge block 40 downward. After the wedge block 40 fills the gap 30 to a predetermined depth, the stopper 80 is connected to the tray 10. In this case, the stopper 80 not only has the function of limiting the position of the wedge block 40, but also can press the wedge block 40 downward during installation, thereby facilitating the installation of the wedge block 40.

[0070] Further, see Figure 4 , the battery pack 100 also includes a connecting plate 90, which is detachably connected to the tray 10. Specifically, the connecting plate 90 is mounted on the tray 10 by screws. The limiting member 80 is a limiting screw, and is mounted on the connecting plate 90 in an adjustable position. The limiting screw is used to abut against the wedge block 40 to limit the wedge block 40 from sliding out of the gap 30. In this way, when the connecting plate 90 is connected to the tray 10 and the limiting screw is installed on the connecting plate 90, the limiting screw can abut against the end face of the wedge block 40 away from the bottom wall 112 to limit the wedge block 40 from sliding out of the gap 30. In addition, when installing the wedge block 40, the adjusting screw can also press down the end face of the wedge block 40 to install the wedge block 40 into the gap 30.

[0071] It should be understood that in some other embodiments, the limiting member 80 can also be set in other ways, such as setting the limiting member 80 as a limiting plate, which abuts against the end face of the wedge block 40 to limit the wedge block 40 from sliding out of the gap 30.

[0072] In other embodiments, see Figure 2 and Figure 9 , the wedge block 40 can also be pressed down by the pressing mechanism 200 to install the wedge block 40 in the gap 30. Figure 2 The pressing mechanism 200 can apply downward pressure to the wedge blocks 40 at both ends of the X direction under the action of a driving member, wherein the driving member can be a motor or a cylinder.

[0073] When pressing down the wedge block 40, the pressing mechanism 200 can avoid the connection plate 90 and the stopper 80. When the wedge block 40 moves down a certain distance and stops, the stop screw is tightened to prevent the wedge block 40 from moving upward. Generally, the stop screw abuts the middle position of the end surface of the wedge block 40. That is, the stop screw is set to the middle position of the wedge block 40, and accordingly, the avoidance portion of the pressing mechanism 200 (such as the avoidance groove 201) is set to the middle position of the wedge block 40.

[0074] In some embodiments, see Figure 10 The battery pack 100 further includes a thermal insulation member 70, which is sandwiched between the wedge block 40 and the battery cell 20 and / or between the wedge block 40 and the tray 10. In some specific embodiments, the thermal insulation member 70 is sandwiched between the wedge block 40 and the battery cell 20. In other specific embodiments, the thermal insulation member 70 is sandwiched between the wedge block 40 and the tray 10. In still other specific embodiments, a thermal insulation member 70 is provided between the wedge block 40 and the battery cell 20, and at the same time, a thermal insulation member 70 is provided between the wedge block 40 and the tray 10. By providing the thermal insulation member 70, the heat exchange between the battery cell 20 and the outside world is reduced, so that the temperature of the battery cell 20 can be controlled.

[0075] Optionally, the heat-insulating member 70 is formed by heat-insulating foam, and the foam is made of polyurethane. Of course, in other embodiments, the type of material used for the heat-insulating member 70 is not limited, as long as the heat-insulating effect can be achieved.

[0076] In some embodiments, see Figure 10 The battery pack 100 also includes a thin-film pressure sensor 110, which is sandwiched between the battery cell 20 and the tray 10, or between two adjacent battery cells 20. Specifically, the thin-film pressure sensor 110 is sandwiched between the larger surface of the battery cell 20 and the tray 10, or between the larger surfaces of two adjacent battery cells 20. The thin-film pressure sensor 110 can detect the pressure value of the battery cell 20 and convert the pressure signal into a resistance signal, which is transmitted to the BMS. This can provide an early warning before any safety risk occurs in the battery pack 100, thereby ensuring the safety and reliability of the battery pack 100.

[0077] Optionally, a thin-sheet pressure sensor 110 is provided between the large surface of a battery cell 20 and the tray 10, and also between the large surfaces of two adjacent battery cells 20. The pressure of the battery pack 100 is detected and evaluated by taking the average or limit value of the pressure detected by multiple thin-sheet pressure sensors 110. It is conceivable that in other embodiments, a thin-sheet pressure sensor 110 may be provided only between the large surfaces of two adjacent battery cells 20, or only between the large surface of a battery cell 20 and the tray 10, without limitation herein.

[0078] In some specific embodiments, the wedge block 40 is provided with a notch, and the sheet pressure sensor 110 is disposed at the notch of the wedge block 40. It is understood that in other embodiments, the placement of the sheet pressure sensor 110 is not limited, as long as it can achieve the effect of detecting the pressure of the battery cell 20.

[0079] Optionally, the sheet pressure sensor 110 is a sheet temperature and pressure sensor. In addition to detecting the pressure of the battery cell 20 , the sheet temperature and pressure sensor can also detect the temperature of the battery cell 20 to prevent the battery cell 20 from overheating.

[0080] Another embodiment of the present application further provides an electrical device including the aforementioned battery pack 100. Since the battery pack 100 has beneficial effects, the electrical device including the aforementioned battery pack 100 has the same beneficial effects, which will not be described in detail here.

[0081] Optionally, the electrical device is a vehicle, which may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.

[0082] It is worth noting that, for pure electric vehicles, the battery pack 100 can be used as a driving power source, thereby replacing fossil fuels to provide driving power.

[0083] In other embodiments, there is no limitation on the type of electrical devices, such as electrical devices may also be ships, spacecraft, electric toys, electric tools, energy storage equipment, amusement equipment, elevators and lifting equipment, etc. Spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys or electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.; energy storage equipment may be energy storage walls, base station energy storage, container energy storage, etc.; amusement equipment may be carousels, bungee jumping machines, etc. This application does not impose any special restrictions on the above-mentioned electrical devices.

[0084] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0085] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A battery pack, characterized in that: include: A tray (10) having a receiving cavity (11); A battery cell group comprises a plurality of battery cells (20), the battery cell group being installed in the accommodating cavity (11), and a gap (30) being formed between the battery cells (20) at at least one end of the battery cell group and a side wall (111) of the accommodating cavity (11); A wedge block (40) has a wedge surface (41), and an inclined surface (114) is formed on the side wall (111) of the accommodating cavity (11); the wedge block (40) is operable to at least partially fill the gap (30) to be sandwiched between the inclined surface (114) and the battery cell (20), and the inclined surface (114) is in contact with and adapted to the wedge surface (41); A first limiting portion is provided on the wedge surface (41), and a second limiting portion is provided on the inclined surface (114). The first limiting portion and the second limiting portion cooperate to limit the wedge block (40) from sliding out of the gap (30).

2. The battery pack according to claim 1, wherein: The first limiting portion is a first rack (50) protruding from the wedge surface (41), and the second limiting portion is a second rack (60) protruding from the inclined surface (114). The teeth of the first rack (50) and the second rack (60) are engaged with each other to limit the wedge block (40) from sliding out of the gap (30).

3. The battery pack according to claim 2, wherein: The second teeth (61) of the second rack (60) extend toward the bottom wall (112) of the accommodating cavity (11), and the extending direction of the first teeth (51) of the first rack (50) is opposite to the extending direction of the second teeth (61) of the second rack (60); or The second teeth (61) of the second rack (60) extend in the direction of the opening (113) of the accommodating cavity (11), and the extension direction of the first teeth (51) of the first rack (50) is opposite to the extension direction of the second teeth (61) of the second rack (60).

4. The battery pack according to claim 3, wherein: There are gaps (30) between the battery cells (20) at both ends of the battery cell group and the side walls (111) of the accommodating cavity (11), and the gaps (30) at each end are filled with the wedge-shaped blocks (40); The second tooth (61) of the second rack (60) corresponding to the wedge block (40) at at least one end extends toward the opening (113) of the accommodating cavity (11), and the extension direction of the first tooth (51) of the first rack (50) is opposite to the extension direction of the second tooth (61) of the second rack (60).

5. The battery pack according to claim 1, wherein: The battery pack further includes a heat-insulating component (70), wherein the heat-insulating component (70) is sandwiched between the wedge-shaped block (40) and the battery cell (20) and / or the heat-insulating component (70) is sandwiched between the wedge-shaped block (40) and the tray (10).

6. The battery pack according to claim 1, wherein: The battery pack further includes a limiting member (80), the limiting member (80) being connected to the tray (10) and being used to abut against the wedge block (40); The position of the limiting member (80) on the tray (10) is adjustable, so that when the wedge block (40) fills the gap (30) to different filling depths, it can abut against the wedge block (40), thereby limiting the wedge block (40) from sliding out of the gap (30).

7. The battery pack according to claim 6, characterized in that: The battery pack further comprises a connecting plate (90), wherein the connecting plate (90) is detachably connected to the tray (10), and the limiting member (80) is a limiting screw, which is installed on the connecting plate (90) in an adjustable position, and the limiting screw is used to abut against the wedge block (40) to limit the wedge block (40) from sliding out of the gap (30).

8. The battery pack according to claim 1, wherein: The tray (10) comprises a tray body (12) and a partition plate (13), wherein the tray body (12) has an inner cavity, and the partition plate (13) is connected to the tray body (12) and divides the inner cavity to form a plurality of the accommodating cavities (11); A gap (30) is provided between the battery cell (20) located at at least one end of each accommodating cavity (11) and the side wall (111) of the accommodating cavity (11), and the wedge-shaped block (40) is filled in the gap (30).

9. The battery pack according to claim 1, wherein: The battery pack further comprises a thin sheet pressure sensor (110), wherein the thin sheet pressure sensor (110) is sandwiched between the battery cell (20) and the tray (10) and / or is sandwiched between two adjacent battery cells (20).

10. An electrical device, characterized in that: Comprising a battery pack as described in any one of claims 1 to 9.

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