Battery pack and electric equipment with same

Abstract

The utility model discloses a battery pack and electric equipment with the battery pack, the battery pack comprises an upper cover part and a lower cover part, the upper cover part and the lower cover part define an accommodating cavity, in a first direction, at least one side of the upper cover part is provided with a first connecting edge, and at least one side of the lower cover part is provided with a second connecting edge; the reinforcing plate is arranged on the side, opposite to the upper cover part, of the lower cover part, the reinforcing plate is provided with a third connecting edge, and the second connecting edge is clamped between the first connecting edge and the third connecting edge to form a connecting matching part; and the battery pack is arranged in the accommodating cavity, and a crumple space is formed between the battery pack and the connection matching part. According to the battery pack disclosed by the embodiment of the utility model, the upper cover part, the lower cover part and the reinforcing plate are used for jointly bearing the extrusion force borne by the battery pack so as to improve the maximum extrusion force which can be borne by the battery pack, and the collapse space is further reserved in the battery pack so as to reduce the possibility that a battery pack is damaged when the battery pack deforms, so that the service life of the battery pack is prolonged. And thus, the battery pack can be better protected.

Description

Technical Field

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

[0002] In a collision accident of an automobile, when the power battery in the automobile is impacted and squeezed, causing the battery cells to deform, the battery cells may undergo thermal runaway and catch fire. The occurrence of thermal runaway and fire will cause secondary harm to the passengers in the vehicle and will also affect the surrounding environment. Therefore, how to strengthen the protection of the battery cells so that they are not easily deformed or have a smaller degree of deformation during a collision has become a major pain point. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a battery pack. The battery pack utilizes the upper cover part, the lower cover part and the reinforcing plate to jointly bear the extrusion force received by the battery pack, so as to increase the maximum extrusion force that the battery pack can bear. Moreover, the battery pack also reserves a collapse space to reduce the possibility of the battery pack being damaged when the battery pack is deformed, thereby being able to better protect the battery pack and improve the safety of the battery pack.

[0004] The utility model also provides an electrical device having the battery pack.

[0005] The battery pack according to the first aspect embodiment of the utility model includes: an upper cover part and a lower cover part, the upper cover part and the lower cover part define an accommodation cavity. In a first direction, at least one side of the upper cover part has a first connection edge, and at least one side of the lower cover part has a second connection edge; a reinforcing plate, the reinforcing plate is arranged on a side of the lower cover part facing away from the upper cover part, the reinforcing plate is provided with a third connection edge, and the second connection edge is clamped between the first connection edge and the third connection edge to form a connection and cooperation part; a battery pack, the battery pack is arranged in the accommodation cavity and there is a collapse space between the battery pack and the connection and cooperation part.

[0006] The battery pack according to the embodiment of the utility model utilizes the upper cover part, the lower cover part and the reinforcing plate to jointly bear the extrusion force received by the battery pack, so as to increase the maximum extrusion force that the battery pack can bear. Moreover, the battery pack also reserves a collapse space to reduce the possibility of the battery pack being damaged when the battery pack is deformed, thereby being able to better protect the battery pack and improve the safety of the battery pack.

[0007] In addition, the battery pack according to the above embodiment of the utility model may further have the following additional technical features:

[0008] According to some embodiments of the present utility model, the lower cover portion is provided with a flow channel for circulating a heat exchange medium, and at least a part of the battery cells in the battery pack perform heat exchange with the lower cover portion.

[0009] According to some alternative embodiments of the present utility model, the lower cover portion includes a heat spreader and a flow channel plate. The flow channel plate is disposed between the heat spreader and the reinforcement plate, and the flow channel is defined between the heat spreader and the flow channel plate.

[0010] According to some embodiments of the present utility model, the crush space includes a first crush sub-space. The upper cover portion further includes a first side wall connected to the first connection edge, and the lower cover portion further includes a second side wall connected to the second connection edge. The first side wall, the second side wall, and the battery pack define the first crush sub-space.

[0011] According to some alternative embodiments of the present utility model, in the first direction, the first side wall extends obliquely away from the first connection edge and the second side wall, and the second side wall extends obliquely away from the second connection edge and the first side wall.

[0012] According to some alternative embodiments of the present utility model, the angle between the first side wall and the first direction is X, and the angle between the second side wall and the first direction is Y, where X > Y.

[0013] According to some alternative embodiments of the present utility model, the angle between the first side wall and the first direction is X, and the angle between the second side wall and the first direction is Y, where 60° ≤ X ≤ 80°; and / or, 20° ≤ Y ≤ 40°.

[0014] According to some specific embodiments of the present utility model, 65° ≤ X ≤ 75°; and / or, 25° ≤ Y ≤ 35°.

[0015] According to some alternative embodiments of the present utility model, the crush space further includes a second crush sub-space. The reinforcement plate further includes a third side wall connected to the third connection edge, and the second crush sub-space is defined between the third side wall and the second side wall.

[0016] According to some alternative embodiments of the present utility model, the third side wall extends obliquely away from the third connection edge and the second side wall in the first direction.

[0017] According to some alternative embodiments of the present utility model, the angle between the third side wall and the first direction is Z, and the angle between the second side wall and the first direction is Y, where Z = 2Y.

[0018] According to some alternative embodiments of the present utility model, the included angle between the third side wall and the first direction is Z, where 50° ≤ Z ≤ 70°.

[0019] According to some specific embodiments of the present utility model, 55° ≤ Z ≤ 65°.

[0020] According to some embodiments of the present utility model, each battery cell in the battery pack is provided with a pole column facing the connection and cooperation part. In the first direction, the pole column is located within the crush space and is spaced apart from the connection and cooperation part.

[0021] According to some embodiments of the present utility model, the battery pack includes a fixed connection hole penetrating through the first connection edge, the second connection edge, and the third connection edge. The battery pack further includes a fixed connection member, and the fixed connection member is installed in the fixed connection hole.

[0022] According to some alternative embodiments of the present utility model, in the first direction, the minimum distance between the central axis of the fixed connection member and the inner edge of the connection and cooperation part facing the pole column is A, the minimum distance between the inner edge of the connection and cooperation part facing the pole column and the pole column is B, and the minimum distance between the central axis of the fixed connection member and the first end of the battery cell provided with the pole column is C, where 1 / 3B ≤ A ≤ 1 / 2C.

[0023] According to some specific embodiments of the present utility model, it is characterized in that 40mm ≤ B ≤ 70mm, and / or, 90mm ≤ C ≤ 130mm.

[0024] According to some specific embodiments of the present utility model, it further includes a bottom guard plate. The reinforcing plate is an annular reinforcing plate. The bottom guard plate is provided on a side of the reinforcing plate facing away from the lower cover part and covers the middle part of the annular reinforcing plate.

[0025] In some embodiments, the reinforcing plate further includes a supporting part connected to the third connection edge. The supporting part is connected to a side of the lower cover part facing away from the upper cover part. In the first direction, the first end of the battery cell provided with the pole column is located between the outer end and the inner end of the supporting part.

[0026] In some examples, in the first direction, the minimum distance between the central axis of the fixed connection member and the first end is C, and the maximum distance between the first end of the battery cell and the inner end of the supporting part is D, where 1 / 2C ≥ D ≥ 1 / 3C.

[0027] Further, 90mm ≤ C ≤ 130mm.

[0028] According to a second aspect embodiment of the present utility model, an electrical device is provided, and the electrical device includes a battery pack according to the embodiment of the first aspect of the present utility model.

[0029] For the electrical device according to the embodiment of the present utility model, by using the battery pack according to the embodiment of the first aspect of the present utility model, the upper cover part, the lower cover part and the reinforcing plate are used together to bear the extrusion force received by the battery pack, so as to increase the maximum extrusion force that the battery pack can bear. Moreover, a collapse space is reserved in the battery pack to reduce the possibility of the battery pack being damaged when the battery pack is deformed, thereby being able to better protect the battery pack and improve the safety of the battery pack.

[0030] Some of the additional aspects and advantages of the present utility model will be given in the following description, some will become obvious from the following description, or will be understood through the practice of the present utility model. Brief Description of the Drawings

[0031] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0032] Figure 1 is a schematic structural diagram of a battery pack according to an embodiment of the present utility model;

[0033] Figure 2 is an exploded view of a battery pack according to an embodiment of the present utility model;

[0034] Figure 3 is a top view of a battery pack according to an embodiment of the present utility model;

[0035] Figure 4 is Figure 3 a cross-sectional view taken along line A-A in

[0036] Figure 5 is a cross-sectional view according to an embodiment of the present utility model;

[0037] Figure 6 is a cross-sectional view according to an embodiment of the present utility model;

[0038] Figure 7 is a schematic structural diagram of a heat pipe, a flow channel plate and a reinforcing plate according to an embodiment of the present utility model;

[0039] Figure 8 is a structural diagram when a constant extrusion force of 100 KN is applied to the connection and cooperation part according to an embodiment of the present utility model;

[0040] Figure 9 is a mathematical model of the extrusion time and the extrusion force received at the fixed connecting piece when a constant extrusion force of 100 KN is applied to the connection and cooperation part according to an embodiment of the present utility model;

[0041] Figure 10 It is a schematic structural view of the connection and cooperation part collapsing after being extruded for a preset time according to an embodiment of the present utility model;

[0042] Figure 11 They are the stress distributions when the battery pack has the first resonance and the stress distributions when the battery pack has the second resonance according to an embodiment of the present utility model;

[0043] Figure 12 They are the stress distributions on the upper cover part and the temperature equalizing plate when the battery pack has the first resonance according to an embodiment of the present utility model.

[0044] Reference numerals: battery pack 1, fixed connection hole 101,

[0045] upper cover part 10, first connection edge 11, first side wall 12,

[0046] reinforcing plate 201, bottom protection plate 202, third connection edge 21, third side wall 22, support part 23, connection and cooperation part 25,

[0047] lower cover part 3, temperature equalizing plate 30, second connection edge 31, second side wall 32, flow channel plate 40, flow channel 41,

[0048] collapse space 50, first collapse sub - space 501, second collapse sub - space 502, fixed connecting piece 63, buffer pad 64, battery pack 70, battery cell 701, pole column 71, adhesive layer 81, thermal conductive adhesive 82. Detailed Embodiment

[0049] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0050] The battery pack 1 according to an embodiment of the present utility model will be described below with reference to the drawings.

[0051] As Figures 1-7 shown, the battery pack 1 according to an embodiment of the present utility model includes an upper cover part 10, a lower cover part 3, a reinforcing plate 201, and a battery pack 70.

[0052] The upper cover part 10 and the lower cover part 3 define an accommodation cavity. The reinforcing plate 201 is arranged on one side of the lower cover part 3 facing away from the upper cover part 10. In the first direction, at least one side of the upper cover part 10 has a first connecting edge 11, and at least one side of the lower cover part 3 has a second connecting edge 31. The reinforcing plate 201 is provided with a third connecting edge 21. The second connecting edge 31 is clamped between the first connecting edge 11 and the third connecting edge 21 to form a connecting and mating part 25. The battery pack 70 is arranged in the accommodation cavity, and a crush space 50 is provided between the battery pack 70 and the connecting and mating part 25.

[0053] Among them, the crush space 50 is used to reserve space for the deformation of the connecting and mating part 25, the upper cover part 10, the lower cover part 3 and the reinforcing plate 201. When the connecting and mating part 25 is squeezed, the connecting and mating part 25 can deform to resist the squeezing force. When the connecting and mating part 25 is squeezed and deformed, setting the crush space 50 can prevent the connecting and mating part 25 from directly contacting the battery pack 70, thereby reducing the possibility of deformation of the battery pack 70 and avoiding safety accidents caused by battery deformation.

[0054] Specifically, the first connecting edge 11, the second connecting edge 31 and the third connecting edge 21 are arranged together. In this way, when the connecting and mating part 25 is subjected to a squeezing force in the first direction, the upper cover part 10, the lower cover part 3 and the reinforcing plate 201 can jointly bear the squeezing force, so that the connecting and mating part 25 can bear a large squeezing force without collapsing, enabling the battery pack 1 to bear a large bearing capacity. When the battery pack 1 is subjected to a squeezing force in the first direction, the squeezing force is not easily directly applied to the battery pack 70, thereby reducing the probability of deformation of the battery pack 70 and improving the safety of the battery pack 1.

[0055] In the battery pack 1 in the prior art, when the battery pack 1 is subjected to a squeezing force, usually the upper cover part 10 and the lower cover part 3 bear the squeezing force. In this application, by providing the third connecting edge 21 on the reinforcing plate 201, the first connecting edge 11, the second connecting edge 31 and the third connecting edge 21 jointly define the connecting and mating part 25, and the upper cover part 10, the lower cover part 3 and the reinforcing plate 201 jointly bear the squeezing force received by the battery pack 1. In this way, the maximum squeezing force that the battery pack 1 can bear can be improved, thereby better protecting the battery pack 70, reducing the probability of deformation of the battery pack 70, and improving the safety of the battery pack 1.

[0056] According to the battery pack 1 of the embodiment of the present invention, by jointly using the upper cover part 10, the lower cover part 3 and the reinforcing plate 201 to bear the squeezing force received by the battery pack 1, the maximum squeezing force that the battery pack 1 can bear is improved, and the battery pack also reserves a crush space 50 to reduce the possibility of damage to the battery pack 70 when the battery pack 1 is deformed, thereby better protecting the battery pack 70 and improving the safety of the battery pack 1.

[0057] The battery pack 1 according to specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0058] In some specific embodiments of the present invention, as Figures 1-8 shown, the battery pack 1 includes an upper cover portion 10, a lower cover portion 3, a reinforcing plate 201, and a battery pack 70.

[0059] In some embodiments of the present invention, as Figure 5 shown, the lower cover portion 3 is provided with a flow channel 41 for circulating a heat exchange medium. At least a part of the battery cells 701 in the battery pack 70 perform heat exchange with the lower cover portion 3. When the heat exchange medium flows in the flow channel 41, it can take away at least a part of the heat on the battery cells 701, and thus absorb the heat generated by the battery cells 701.

[0060] In some embodiments, the lower cover portion 3 is disposed between the battery pack 70 and the reinforcing plate 201 to support the battery pack 70. In this way, under the action of gravity, it is convenient for the battery pack 70 to better contact the lower cover portion 3, so as to utilize the lower cover portion 3 to better dissipate heat from at least a part of the battery cells 701.

[0061] In some embodiments, a part of the reinforcing plate 201 is attached to the bottom of the lower cover portion 3 to support the battery pack 70 jointly by the reinforcing plate 201 and the lower cover portion 3, and provide a stable supporting force for the battery pack 70.

[0062] In some embodiments, as Figure 2 shown, an adhesive layer 81 is provided between the battery pack 70 and the upper cover portion 10 to fix the battery pack 70 and the upper cover portion 10 together and limit the position of the battery pack 70 in the accommodation cavity.

[0063] In other embodiments, as Figure 2 shown, a thermal conductive adhesive 82 is provided between the battery pack 70 and the lower cover portion 3 to fix the battery pack 70 and the lower cover portion 3 together, and at the same time, heat exchange can be performed through the thermal conductive adhesive 82.

[0064] In some alternative embodiments of the present invention, as Figure 2 、 Figure 5 and Figure 7 shown, the lower cover portion 3 includes a heat dissipation plate 30 and a flow channel plate 40. The flow channel plate 40 is disposed between the heat dissipation plate 30 and the reinforcing plate 201. A flow channel 41 is defined between the heat dissipation plate 30 and the flow channel plate 40. When the heat exchange medium flows in the flow channel 41, it can take away at least a part of the heat on the battery cells 701, and thus absorb the heat generated by the battery cells 701.

[0065] The heat exchange medium exchanges heat with the temperature averaging plate 30 , and the temperature averaging plate 30 can be used to achieve uniform heat exchange for the battery pack 70 , thereby keeping the battery pack 70 at a suitable temperature, thereby improving the working performance of the battery pack 70 .

[0066] Specifically, the heat exchange medium exchanges heat with the temperature averaging plate 30 when flowing in the flow channel 41. When the temperature of the environment in which the battery pack 1 is located is too low and the battery group 70 needs to be heated, the heat exchange medium can heat the temperature averaging plate 30, and the temperature averaging plate 30 can transfer heat evenly to the battery cells 701 in contact with it, so as to evenly heat the battery cells 701. When the temperature of the environment in which the battery pack 1 is located is too high and the battery group 70 needs to be cooled, the heat generated by the battery cells 701 in contact with it will be evenly transferred to the temperature averaging plate 30, and the heat exchange medium can take away the heat on the temperature averaging plate 30 when flowing, so as to evenly cool the battery cells 701.

[0067] In some embodiments of the present invention, Figure 5 As shown, the collapse space 50 includes a first collapse sub-space 501, the upper cover portion 10 also includes a first side wall 12 connected to the first connecting edge 11, and the lower cover portion 3 also includes a second side wall 32 connected to the second connecting edge 31. The first side wall 12, the second side wall 32 and the battery pack 70 define the first collapse sub-space 501.

[0068] Specifically, the first side wall 12 defines the inner wall of the first collapse sub-space 501, and the second side wall 32 defines the inner wall of the first collapse sub-space 501, so that the lower cover part 3 and the upper cover part 10 together define the first collapse sub-space 501, which can improve the structural strength of the upper cover part 10 and the lower cover part 3, and thereby enable the upper cover part 10 and the lower cover part 3 to bear a greater extrusion force.

[0069] At the same time, the first collapse sub-space 501 reserves space for the deformation of the upper cover part 10, the lower cover part 3 and the reinforcing plate 201, so that when the upper cover part 10, the lower cover part 3 and the reinforcing plate 201 are deformed by the extrusion force, they can produce a certain deformation to resist the extrusion force, thereby increasing the extrusion force that the upper cover part 10, the lower cover part 3 and the reinforcing plate 201 can bear.

[0070] In some embodiments, Figure 5 , Figure 6 As shown, in the first direction, the first side wall 12 extends obliquely in the direction away from the first connecting edge 11 and the second side wall 32, which facilitates the molding of the upper cover portion 10. In addition, the first side wall 12 can support the first connecting edge 11 in an extension direction different from that of the first connecting edge 11, thereby supporting the connecting mating portion 25.

[0071] Specifically, when the connection and cooperation part 25 is extruded in the first direction and deforms towards the inside of the first collapse subspace 501 in the first direction, since the extending directions of the first side wall 12 and the first connection edge 11 are different, during the process that the first connection edge 11 is extruded and deforms in the first direction, the first side wall 12 is not easily crushed and can support the first connection edge 11 when the first connection edge 11 deforms, thereby improving the support effect on the connection and cooperation part 25.

[0072] In some embodiments, in the first direction, the second side wall 32 extends obliquely away from the second connection edge 31 and the first side wall 12, which is convenient for the forming of the lower cover part 3. In addition, the second side wall 32 can support the second connection edge 31 in an extending direction different from that of the second connection edge 31, thereby supporting the connection and cooperation part 25.

[0073] Specifically, when the connection and cooperation part 25 is extruded in the first direction and deforms towards the inside of the first collapse subspace 501 in the first direction, since the extending directions of the second side wall 32 and the second connection edge 31 are different, during the process that the second connection edge 31 is extruded and deforms in the first direction, the second side wall 32 is not easily crushed and can support the second connection edge 31 when the second connection edge 31 deforms, thereby improving the support effect on the connection and cooperation part 25.

[0074] In some specific embodiments, in the first direction, the first side wall 12 extends obliquely away from the first connection edge 11 and the second side wall 32, and the second side wall 32 extends obliquely away from the second connection edge 31 and the first side wall 12. It can be understood that the extending directions of the first side wall 12, the second side wall 32, and the connection and cooperation part 25 are all different, so as to support the connection and cooperation part 25 from different directions by using the first side wall 12 and the second side wall 32. In other words, when the connection and cooperation part 25 is subjected to an extrusion force, the connection and cooperation part 25 can disperse the extrusion force it receives along the directions of the first side wall 12 and the second side wall 32, avoiding the concentration of the extrusion force at one place, thereby facilitating the improvement of the pressure bearing effect of the connection and cooperation part 25, enabling the connection and cooperation part 25 to bear a greater pressure, enabling the battery pack 1 to bear a greater extrusion force, and improving the safety of the battery pack 1.

[0075] In some examples, such as Figure 5 、 Figure 6As shown, the first direction extends in the left - right direction. The upper cover portion 10 is provided above the lower cover portion 3. The first connecting edge 11 and the second connecting edge 31 extend in the left - right direction (it should be understood that the above - mentioned direction definition is only for facilitating the description of the drawings and will not limit the actual installation position and direction of the battery pack 1). The first connecting edge 11 is located outside the first side wall 12, and the first side wall 12 extends upward from the outside to the inside. The second connecting edge 31 is located outside the second side wall 32, and the second side wall 32 extends downward from the outside to the inside, so that the first side wall 12 and the second side wall 32 extend in different directions. When the connecting and mating portion 25 is subjected to a squeezing force, the connecting and mating portion 25 can disperse the squeezing force it receives along the directions of the first side wall 12 and the second side wall 32, avoiding the concentration of the squeezing force on the upper cover portion 10 or the lower cover portion 3. Furthermore, it is convenient to improve the pressure - bearing effect of the connecting and mating portion 25 on the pressure, enabling the connecting and mating portion 25 to withstand a greater squeezing force, enabling the battery panel to bear a greater squeezing force, and improving the safety of the battery pack 1.

[0076] Here, it needs to be explained that the above - mentioned inside and outside are relative to the central axis of the accommodating cavity. The direction on the side of the first side wall 12 close to the central axis of the accommodating cavity is the inside, and the direction on the side of the first side wall 12 far from the central axis of the accommodating cavity is the outside.

[0077] In some specific embodiments of the present utility model, the included angle between the first side wall 12 and the first direction is X, and the included angle between the second side wall 32 and the first direction is Y, and X > Y.

[0078] Among them, the first connecting edge 11 and the third connecting edge 21 extend in the first direction, so that the included angle between the first side wall 12 and the first direction is larger, and the included angle between the second side wall 32 and the first direction is smaller. In this way, the lower cover portion 3 can bear a greater pressure, and the upper cover portion 10 bears a smaller pressure.

[0079] In some embodiments, the basic material of the upper cover portion 10 is a metal flat plate. By stamping a part of the basic material of the upper cover portion 10 upward, a part of the first crush - resistant sub - space 501 is defined. The basic material of the lower cover portion 3 is also a metal flat plate. By stamping a part of the basic material of the lower cover portion 3 downward, another part of the first crush - resistant sub - space 501 is defined.

[0080] Among them, the thickness of the upper cover portion 10 is smaller, so that the upper cover portion 10 has better deformation ability. Furthermore, the basic material of the upper cover portion 10 can be stamped to a greater extent to define a larger accommodating cavity, facilitating the accommodation of more battery groups 70. The thickness of the lower cover portion 3 is smaller, so that the lower cover portion 3 has stronger thermal conductivity, and can thus balance the temperatures of multiple battery groups 70.

[0081] Therefore, make X > Y, that is, the angle between the first side wall 12 and the first connecting edge 11 is larger. In this way, when the connecting and fitting part 25 is subjected to a squeezing force, the squeezing force transmitted to the first side wall 12 is less, so that the upper cover part 10 with a smaller thickness bears less pressure. The angle between the second side wall 32 and the second connecting edge 31 is smaller. In this way, when the connecting and fitting part 25 is subjected to a squeezing force, the squeezing force transmitted to the second side wall 32 is larger, so that the lower cover part 3 with a larger thickness can bear more pressure. Furthermore, it is convenient to reasonably distribute the squeezing force, so that the lower cover part 3 with a larger strength bears a larger pressure, and the upper cover part 10 with a smaller strength bears a smaller pressure. Furthermore, it is convenient to improve the comprehensive compressive capacity of the battery pack 1.

[0082] In some embodiments, the included angle between the first side wall 12 and the first direction is X, and the included angle between the second side wall 32 and the first direction is Y, 60° ≤ X ≤ 80°. Make X within this range so that the upper cover part 10 can define a part of a larger accommodation cavity, and then it is convenient to accommodate more battery packs 70 in the accommodation cavity. At the same time, when the connecting and fitting part 25 is subjected to a squeezing force, part of the squeezing force at the connecting and fitting part 25 can be smoothly dispersed to the upper cover part 10, and the upper cover part 10 is used to bear the squeezing force together.

[0083] Among them, X can be 60°, 65°, 70°, 75°, 80°, etc.

[0084] In some examples, 65° ≤ X ≤ 75°. Through experiments, when the value of X is within this range, part of the squeezing force can be dispersed to the upper cover part 10 when the connecting and fitting part 25 is subjected to a squeezing force, and the upper cover part 10 can bear this part of the squeezing force without being crushed, so as to achieve a better compressive effect.

[0085] Specifically, X can be 65°, 67°, 69°, 70°, 72°, 74°, 75°, etc.

[0086] In some embodiments, the included angle between the first side wall 12 and the first direction is X, and the included angle between the second side wall 32 and the first direction is Y, 20° ≤ Y ≤ 40°. Make Y within this range so that the lower cover part 3 can define another part of the first crushable sub-space 501. At the same time, when the connecting and fitting part 25 is subjected to a squeezing force, part of the squeezing force at the connecting and fitting part 25 can be smoothly dispersed to the lower cover part 3, and the lower cover part 3 is used to bear the squeezing force together.

[0087] Among them, Y can be 20°, 25°, 30°, 35°, 40°, etc.

[0088] In some examples, 25° ≤ Y ≤ 35°. Through experiments, when the value of Y is within this range, part of the extrusion force can be dispersed to the lower cover part 3 when the connecting and mating part 25 is subjected to the extrusion force, and the lower cover part 3 can withstand this part of the extrusion force without being crushed, so as to achieve a better compressive effect.

[0089] Specifically, X can be 25°, 27°, 29°, 30°, 32°, 34° or 35°, etc.

[0090] In some alternative embodiments of the present utility model, as Figure 5 shown, the collapse space 50 further includes a second collapse sub - space 502. The reinforcing plate 201 further includes a third side wall 22 connected to the third connecting edge 21. The second collapse sub - space 502 is defined between the third side wall 22 and the second side wall 32.

[0091] Among them, the third side wall 22 defines the inner wall of the second collapse sub - space 502, and the second side wall 32 defines the inner wall of the second collapse sub - space 502. The lower cover part 3 and the reinforcing plate 201 together define the second collapse sub - space 502, which can improve the structural strength of the lower cover part 3 and the reinforcing plate 201, and further enable the lower cover part 3 and the reinforcing plate 201 to bear a greater extrusion force.

[0092] At the same time, the second collapse sub - space 502 reserves space for the deformation of the upper cover part 10, the lower cover part 3 and the reinforcing plate 201. In this way, when the upper cover part 10, the lower cover part 3 and the reinforcing plate 201 are subjected to extrusion force and deform, they can produce a certain amount of deformation to resist the extrusion force, improving the extrusion force that the upper cover part 10, the lower cover part 3 and the reinforcing plate 201 can bear.

[0093] In some embodiments, the third side wall 22 extends obliquely away from the third connecting edge 21 and the second side wall 32 in the first direction. This is convenient for the forming of the reinforcing plate 201. In addition, the third side wall 22 can support the third connecting edge 21 and the connecting and mating part 25 in a direction different from that of the third connecting edge 21.

[0094] Specifically, when the connecting and mating part 25 is extruded in the first direction and deforms inwardly into the second collapse sub - space 502 along the first direction, since the extending direction of the third side wall 22 is different from that of the third connecting edge 21, during the process that the third connecting edge 21 is extruded and deforms along the first direction, the third side wall 22 is not easily crushed and can also support the third connecting edge 21 when the third connecting edge 21 deforms, thereby improving the supporting effect on the connecting and mating part 25.

[0095] In some alternative embodiments of the present utility model, as Figure 6As shown, the included angle between the third side wall 22 and the first direction is Z, and Z = 2Y, so that the third side wall 22 of the reinforcing plate 201 and the second side wall 32 of the lower cover portion 3 can define a second crush sub-space 502 with a certain volume.

[0096] Among them, the extending directions of the first side wall 12, the second side wall 32, and the third side wall 22 are different, and the first side wall 12, the second side wall 32, and the third side wall 22 all have an included angle with the first direction. In this way, when the connecting and fitting portion 25 is subjected to a squeezing force, the connecting and fitting portion 25 can disperse the squeezing force it receives along the directions of the first side wall 12, the second side wall 32, and the third side wall 22. By limiting the values of X, Y, and Z, the squeezing force can be appropriately distributed to the upper cover portion 10, the lower cover portion 3, and the reinforcing plate 201.

[0097] In some alternative embodiments of the present utility model, as Figure 6 shown, the included angle between the third side wall 22 and the first direction is Z, 50° ≤ Z ≤ 70°, so that Z is within this range to be able to define a second crush sub-space 502 with a relatively large volume. At the same time, when the connecting and fitting portion 25 is subjected to a squeezing force, a part of the squeezing force at the connecting and fitting portion 25 can be smoothly dispersed to the reinforcing plate 201, and the reinforcing plate 201 is utilized to bear the squeezing force together.

[0098] In some examples, 55° ≤ Z ≤ 65°. Through experiments, when Z is within this range, when the connecting and fitting portion 25 is subjected to a squeezing force, a part of the squeezing force can be dispersed to the reinforcing plate 201, and the reinforcing plate 201 can withstand this part of the squeezing force without being crushed, so as to achieve a better compressive effect.

[0099] Specifically, Z can be 55°, 57°, 59°, 60°, 62°, 64°, or 65°, etc.

[0100] In some specific embodiments of the present utility model, as Figure 5 shown, the first direction extends in the left-right direction. In the up-down direction, there are successively the upper cover portion 10, the lower cover portion 3, and the reinforcing plate 201. The first side wall 12 extends upward from the outside to the inside, the included angle between the first side wall 12 and the first direction is X, the second side wall 32 extends downward from the outside to the inside, the included angle between the second side wall 32 and the first direction is Y, the third side wall 22 extends downward from the outside to the inside, and the included angle between the third side wall 22 and the first direction is Z.

[0101] The first side wall 12 of the upper cover portion 10 extends upward from the outside to the inside, and the second side wall 32 of the lower cover portion 3 extends downward from the outside to the inside, so that the upper cover portion 10 and the lower cover portion 3 define a first crush sub-space 501 with a relatively large volume. A part of the plurality of battery packs 70 is disposed in the first crush sub-space 501 and supported on the lower cover portion 3.

[0102] The third side wall 22 of the reinforcing plate 201 extends downward from the outside to the inside, and the second side wall 32 of the lower cover portion 3 extends downward from the outside to the inside. Wherein, the lower cover portion 3 further includes a second plate portion located inside the second side wall 32, and the reinforcing plate 201 further includes a support portion 23 located inside the third side wall 22. The second plate portion is in contact with the support portion 23, and at least a part of the battery pack 70 is supported by the second plate portion and the support portion 23, so as to support a plurality of battery packs 70 together with the lower cover portion 3 and the reinforcing plate 201.

[0103] The third side wall 22 of the reinforcing plate 201 and the second side wall 32 of the lower cover portion 3 define a second collapse subspace 502. Since the reinforcing plate 201 is provided below the lower cover portion 3, ∠Y is within ∠Z, and Z > Y.

[0104] Wherein, the extending directions of the first side wall 12, the second side wall 32, and the third side wall 22 are different, and the first side wall 12, the second side wall 32, and the third side wall 22 all have an included angle with the first direction. In this way, when the connecting and fitting portion 25 is subjected to a squeezing force, the connecting and fitting portion 25 can disperse the squeezing force it receives along the directions of the first side wall 12, the second side wall 32, and the third side wall 22. By limiting the values of X, Y, and Z, the squeezing force can be appropriately distributed to the upper cover portion 10, the lower cover portion 3, and the reinforcing plate 201.

[0105] Specifically, 60° ≤ X ≤ 80°, 20° ≤ Y ≤ 40°, 50° ≤ Z ≤ 70°, so as to appropriately distribute the squeezing force received by the connecting and fitting portion 25 to the upper cover portion 10, the lower cover portion 3, and the reinforcing plate 201, so that it can withstand a part of the squeezing force while being not easily crushed.

[0106] Wherein, X > Z. Since the thickness of the upper cover portion 10 is smaller and the thickness of the reinforcing plate 201 is larger, X > Z. When the connecting and fitting portion 25 is subjected to a squeezing force, the squeezing force transmitted to the first side wall 12 is less, and the squeezing force transmitted to the third side wall 22 is larger, so that the reinforcing plate 201 with greater strength bears a larger squeezing force, and the upper cover portion 10 with smaller strength bears a smaller pressure, thereby facilitating the improvement of the comprehensive compressive capacity of the battery pack 1.

[0107] In some examples, 20° ≥ X - Z ≥ 10°, so as to avoid the squeezing force borne by the reinforcing plate 201 from being too large when more squeezing force is distributed to the reinforcing plate 201.

[0108] In some embodiments, such as Figure 1 、 Figure 5As shown, the battery pack 1 includes a fixed connection hole 101 that penetrates through the first connection edge 11, the second connection edge 31, and the third connection edge 21. The fixed connection hole 101 is adapted to install a fixed connection member 63 to connect the first connection edge 11, the second connection edge 31, and the third connection edge 21 together to form a connection and cooperation portion 25, and at the same time, the battery pack 1 can be fixed to a specified position from the connection and cooperation portion 25.

[0109] In some examples, in the experiment of extruding the connection and cooperation portion 25 with an extrusion force of 100 KN for a preset time, X = 70°, Y = 30°, Z = 60°, as Figures 8-9 shown, Figure 8 is a structural diagram when extruding the connection and cooperation portion 25 with a constant extrusion force of 100 KN. Figure 9 is a mathematical model of the extrusion time and the extrusion force received at the fixed connection member 63.

[0110] Among them, when extruding the connection and cooperation portion 25 with a constant extrusion force of 100 KN for a preset time, supported by the first side wall 12, the second side wall 32, and the third side wall 22, the connection and cooperation portion 25 will deform, but always has the compressive ability against the external extrusion force and is not defeated. That is to say, when X = 70°, Y = 30°, Z = 60°, the battery pack 1 also has good compressive ability against an extrusion force of 100 KN.

[0111] It should be noted here that the values corresponding to different colors in the figure are used to represent different stresses in different regions, rather than the specific stress values in that region. Figure 9 The ordinate in is the extrusion force received at the connection and cooperation portion 25, 1E+005 means 1×10 5 = 100000 N, 1.5E+005 means 1.5×10 5 = 150000 N.

[0112] In some embodiments of the present invention, as Figure 5 、 Figure 6 shown, each battery cell 701 in the battery pack 70 is provided with a pole column 71 facing the connection and cooperation portion 25. In the first direction, the pole column 71 is located in the collapse space 50 and is spaced apart from the connection and cooperation portion 25 to reserve space for the deformation of the connection and cooperation portion 25. In this way, when the connection and cooperation portion 25 is extruded and deformed into the collapse space 50, the possibility of direct contact between the connection and cooperation portion 25 and the pole column 71 can be reduced, thereby reducing the possibility of damage to the battery cell 701 and improving the use safety of the battery pack 1.

[0113] In some alternative embodiments of the present invention, as Figure 1As shown, the battery pack 1 includes a fixed connection hole 101 that penetrates through the first connection edge 11, the second connection edge 31, and the third connection edge 21. The battery pack 1 further includes a fixed connection member 63, and the fixed connection member 63 is installed in the fixed connection hole 101 to connect the first connection edge 11, the second connection edge 31, and the third connection edge 21 together by means of the fixed connection member 63 to form a connection and cooperation portion 25. At the same time, the battery pack 1 can be fixed to a specified position from the connection and cooperation portion 25.

[0114] In some embodiments, as Figure 1 shown, the width direction of the first connection edge 11, the second connection edge 31, and the third connection edge 21 extends along the first direction, and the length direction extends along the second direction. The second direction is perpendicular to the first direction. A plurality of fixed connection members 63 are arranged at intervals along the second direction to connect and fix the first connection edge 11, the second connection edge 31, and the third connection edge 21 together at different positions.

[0115] In some alternative embodiments of the present utility model, as Figure 5 、 Figure 6 shown, in the first direction, the minimum distance between the central axis of the fixed connection member 63 and the inner edge of the connection and cooperation portion 25 facing the pole column 71 is A, the minimum distance between the inner edge of the connection and cooperation portion 25 facing the pole column 71 and the pole column 71 is B, and the minimum distance between the central axis of the fixed connection member 63 and the first end of the battery cell 701 provided with the pole column 71 is C.

[0116] It can be understood that the collapse space 50 is located between the fixed connection member 63 and the first end of the battery cell 701, and the first end of the battery cell 701 is located at the edge of the collapse space 50. In other words, by setting the collapse space 50, a space is reserved for the deformation of the fixed connection member 63, avoiding that when the fixed connection member 63 collapses into the accommodation cavity, it will squeeze the pole column 71 of the battery cell 701, avoiding the deformation of the battery pack 70 due to extrusion, and avoiding the thermal runaway and fire of the battery pack 70 due to deformation.

[0117] Among them, 1 / 3B ≤ A ≤ 1 / 2C. When the battery pack 1 is squeezed in the first direction, making 1 / 3B ≤ A can limit the distance between the fixed connection member 63 and the inner edge of the connection and cooperation portion 25 facing the pole column 71, avoiding the distance between the fixed connection member 63 and the inner edge of the connection and cooperation portion 25 facing the pole column 71 from being too small, so that there is a certain distance between the fixed connection member 63 and the inner edge of the connection and cooperation portion 25 facing the pole column 71 to ensure the strength and deformability of the connection and cooperation portion 25, and further enabling the connection and cooperation portion 25 to bear a certain extrusion force.

[0118] Make A ≤ 1 / 2C to limit the distance between the fixed connecting piece 63 and the inner edge of the connecting and mating part 25 facing the pole column 71, and avoid the distance between the fixed connecting piece 63 and the inner edge of the connecting and mating part 25 facing the pole column 71 from being too large. In this way, when the connecting and mating part 25 is extruded in the first direction and collapses into the collapse space 50, even if the fixed connecting piece 63 is completely deformed into the collapse space 50, at most it will only occupy half of the collapse space 50, so as to fully avoid the fixed connecting piece 63 from squeezing the first end of the battery cell 701.

[0119] In some specific embodiments of the present invention, 40mm ≤ B ≤ 70mm. Make 40mm ≤ B to keep the inner edge of the connecting and mating part 25 facing the pole column 71 and the pole column 71 within a safe distance, and avoid the inner edge of the connecting and mating part 25 facing the pole column 71 from contacting the pole column 71 when deforming into the collapse space 50 and causing damage to the pole column 71. Make B ≤ 70mm to avoid the distance between the fixed connecting piece 63 and the battery pack 70 from being too large. Among them, the battery pack 70 has pressure on the bottom wall of the accommodation cavity. If the distance between the fixed connecting piece 63 and the battery pack 70 is too large, the torque transmitted to the fixed connecting piece 63 will be too large.

[0120] In some embodiments, B = 40mm, 45mm, 50mm, 55mm, 60mm, 65mm or 70mm.

[0121] In some specific embodiments of the present invention, 90mm ≤ C ≤ 130mm. Make 90mm ≤ C to keep the inner edge of the connecting and mating part 25 facing the pole column 71 and the first end of the battery cell 701 within a safe distance, and avoid the inner edge of the connecting and mating part 25 facing the pole column 71 from contacting the first end of the battery cell 701 when deforming into the collapse space 50 and causing damage to the battery cell 701. Make C ≤ 130mm to avoid the distance between the fixed connecting piece 63 and the first end of the battery cell 701 from being too large. Among them, the battery pack 70 has pressure on the bottom wall of the accommodation cavity. If the distance between the fixed connecting piece 63 and the battery pack 70 is too large, the torque transmitted to the fixed connecting piece 63 will be too large.

[0122] In some specific embodiments of the present invention, such as Figure 1 , Figure 5 and Figure 7 shown, the battery pack further includes a bottom guard plate 202, and the reinforcing plate 201 is an annular reinforcing plate 201. The bottom guard plate 202 is arranged on the side of the reinforcing plate 201 facing away from the lower cover part 3 and covers the middle part of the annular reinforcing plate 201. By separately arranging the bottom guard plate 202 and the reinforcing plate 201, it is convenient to improve the flexibility of material and size selection.

[0123] For example, the thickness of the reinforcing plate 201 bearing a larger extrusion force can be set to be larger, and the thickness of the lower supporting plate can be set to be smaller, thereby saving materials and costs.

[0124] In some embodiments, Figure 7 As shown, the battery pack 1 also includes a flow channel plate 40, which is arranged above the reinforcing plate 201, and a lower support plate is arranged below the reinforcing plate 201, the inner part of the reinforcing plate 201 supports the outer periphery of the flow channel plate 40, and the lower support plate supports the interior of the flow channel plate 40.

[0125] In some examples, such as Figure 2 , Figure 5 As shown, a buffer pad 64 is provided between the lower support plate and the flow channel plate 40 , so that when the battery pack 1 vibrates, the vibration transmitted to the flow channel plate 40 can be reduced, thereby reducing the vibration frequency of the flow channel plate 40 .

[0126] In some embodiments of the present invention, Figure 5 As shown, the reinforcing plate 201 also includes a supporting portion 23 connected to the third connecting edge 21, and the supporting portion 23 is located on the side of the lower cover portion 3 facing away from the upper cover portion 10. In the first direction, the battery cell 701 is provided with a first end of a pole 71 located between the outer end and the inner end of the supporting portion 23, so as to use the reinforcing plate 201 to support multiple battery cells 701.

[0127] In some embodiments, Figure 1 As shown, the plurality of battery cells 701 are arranged along the second direction, the length direction of the reinforcing plate 201 extends along the second direction, the width direction extends along the first direction, and a portion of the plurality of battery cells 701 is supported on the inner side of the support portion 23 .

[0128] In some optional embodiments of the present invention, Figure 6 As shown, in the first direction, the minimum distance between the central axis of the fixed connection member 63 and the first end of the battery cell 701 provided with the pole 71 is C, and the maximum distance between the first end of the battery cell 701 and the inner end of the support portion 23 is D, wherein 1 / 2C≥D≥1 / 3C, so that the support portion 23 supports the battery cell 701 and a part of the lower cover portion 3, and then can stably support the battery group 70 and the lower cover portion 3, thereby improving the overall structural strength of the battery pack 1, and at the same time facilitating the improvement of the natural frequency of the battery pack 1 when it resonates, so that when the battery pack 1 resonates for the first time, the stress on the upper cover portion 10 and the cold plate at the two end regions in the first direction is relatively small.

[0129] In some embodiments, 90 mm ≤ C ≤ 130 mm. Making 90 mm ≤ C ensures that the inner edge of the connection and mating part 25 facing the pole 71 and the first end of the battery cell 701 are kept within a safe distance, preventing the inner edge of the connection and mating part 25 facing the pole 71 from contacting the first end of the battery cell 701 when deforming into the collapse space 50 and damaging the pole 71 of the battery cell 701. Making C ≤ 130 mm avoids an excessive distance between the fixed connection member 63 and the battery pack 70. Among them, the battery pack 70 exerts pressure on the bottom wall of the accommodation cavity. If the distance between the fixed connection member 63 and the battery pack 70 is too large, the torque transmitted to the fixed connection member 63 will be too large.

[0130] Among them, C can be 90 mm, 95 mm, 100 mm, 105 mm, 110 mm, 115 mm, 120 mm, 125 mm, 130 mm.

[0131] In some embodiments, a vibration simulation experiment is carried out on the battery pack 1, and C = 110 mm. Figure 11 are the stress distributions when the battery pack 1 has the first resonance and the stress distribution when the battery pack 1 has the second resonance. When the battery pack 1 has the first resonance, the natural frequency is 64.08 Hz. When the battery pack 1 has the second resonance, the natural frequency is 66.29 Hz, so as to achieve a relatively large natural frequency, increasing the difficulty of the battery pack 1 resonating, and thus improving the safety of the battery pack 1.

[0132] It should be explained here that when the battery pack 1 resonates, it will cause excessive local stress in the battery pack 1. At this time, the structure of the battery pack 1 is very fragile and easy to be damaged. Therefore, by increasing the difficulty of the battery pack 1 resonating, that is, increasing the value of the natural frequency, the possibility of the battery pack 1 resonating can be reduced, and thus the safety of the battery pack 1 is improved.

[0133] It should be noted here that the values corresponding to different colors in the figure are used to represent different stresses in different regions, rather than the stress values in that region.

[0134] As Figure 12 shown, this is the stress distribution at the upper cover part 10 and the flow channel plate 40 when the battery pack 1 has the first resonance. It can be known from the experiment that the stress on the upper cover part 10 and the cold plate at both ends of the first direction is relatively small. At this time, when the connection and mating part 25 is subjected to the extrusion force in the first direction, the upper cover part 10 and the cold plate are not easily crushed.

[0135] It should be noted here that the values corresponding to different colors in the figure are used to represent different stresses in different regions, rather than the stress values in that region.

[0136] As Figure 10As shown, in the experiment of squeezing the connection and mating part 25 twice with a squeezing force of 100 KN for a preset time, X = 70°, Y = 30°, Z = 60°, and C = 110 mm. Figure 10 Figure 10 is a schematic structural view of the connection and mating part 25 after being squeezed for a preset time and collapsing. At this time, the degree of deformation of the connection and mating part 25 is 11.5%. The dimensions of the connection and mating part 25 that have collapsed are 36.1 mm and 43.1 mm respectively. Compared with the dimension of C = 110 mm, there is still a large distance between the collapsed connection and mating part 25 and the first end of the battery cell 701. That is to say, the experiment can prove that it is very difficult for the collapsed connection and mating part 25 to come into contact with the first end of the battery cell 701, that is, it will not squeeze the first end of the battery cell 701, so as to prove that the battery pack 1 has good safety.

[0137] The electrical equipment according to an embodiment of the present invention will be described below. The electrical equipment according to an embodiment of the present invention includes the battery pack 1 according to the above embodiment of the present invention.

[0138] Among them, the electrical equipment can be the electrical equipment in a vehicle or the electrical equipment in household appliances, and there is no excessive limitation here.

[0139] When the electrical equipment is the electrical equipment in a vehicle, the first direction extends in the left - right direction. Specifically, when a collision occurs in the left - right direction of the vehicle during driving, it is easy to squeeze the battery pack 1 in the vehicle. By using the upper cover part 10, the lower cover part 3 and the reinforcing plate 201 to jointly bear the squeezing force in the first direction received by the battery pack 1, the battery pack 70 can be better protected to avoid the deformation of the battery pack 70 or reduce the probability of the deformation of the battery pack 70, thereby improving the safety of the vehicle.

[0140] For the electrical equipment according to an embodiment of the present invention, by using the battery pack 1 according to the above embodiment of the present invention, and by using the upper cover part 10, the lower cover part 3 and the reinforcing plate 201 to jointly bear the squeezing force received by the battery pack 1, the maximum squeezing force that the battery pack 1 can bear is increased. Moreover, the battery pack also reserves a collapse space 50 to reduce the possibility of the battery pack 70 being damaged when the battery pack 1 is deformed, and thus the battery pack 70 can be better protected and the safety of the battery pack 1 is improved.

[0141] The other components and operations of the electrical equipment according to an embodiment of the present invention are known to those of ordinary skill in the art and will not be described in detail here.

[0142] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise stated, the meaning of "a plurality" is two or more. In the description of the present utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may also include the first and second features not being in direct contact but being in contact through additional features therebetween.

[0143] In the description of the present utility model, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature has a higher horizontal height than the second feature.

[0144] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection" and "coupling" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0145] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0146] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: include: An upper cover portion (10) and a lower cover portion (3), wherein the upper cover portion (10) and the lower cover portion (3) define a receiving cavity, and in a first direction, at least one side of the upper cover portion (10) has a first connecting edge (11), and at least one side of the lower cover portion (3) has a second connecting edge (31); a reinforcing plate (201), the reinforcing plate (201) being arranged on a side of the lower cover portion (3) facing away from the upper cover portion (10), the reinforcing plate (201) being provided with a third connecting edge (21), the second connecting edge (31) being clamped on the first connecting edge (11) and the third connecting edge (21) to form a connecting fitting portion (25); A battery pack (70), wherein the battery pack (70) is disposed in the accommodating cavity and a collapse space (50) is provided between the battery pack and the connecting and matching portion (25).

2. The battery pack according to claim 1, characterized in that: The lower cover portion (3) is provided with a flow channel (41), the flow channel (41) is used to circulate a heat exchange medium, and at least a portion of the battery cells (701) in the battery pack (70) exchange heat with the lower cover portion (3).

3. The battery pack according to claim 2, characterized in that: The lower cover (3) comprises a temperature averaging plate (30) and a flow channel plate (40); the flow channel plate (40) is arranged between the temperature averaging plate (30) and the reinforcing plate (201); and the flow channel (41) is defined between the temperature averaging plate (30) and the flow channel plate (40).

4. The battery pack according to claim 1, characterized in that: The collapse space (50) includes a first collapse sub-space (501), the upper cover portion (10) also includes a first side wall (12) connected to the first connecting edge (11), the lower cover portion (3) also includes a second side wall (32) connected to the second connecting edge (31), and the first collapse sub-space (501) is defined between the first side wall (12), the second side wall (32) and the battery pack (70).

5. The battery pack according to claim 4, characterized in that: In the first direction, the first side wall (12) extends obliquely in a direction away from the first connecting edge (11) and the second side wall (32), and the second side wall (32) extends obliquely in a direction away from the second connecting edge (31) and the first side wall (12).

6. The battery pack according to claim 5, characterized in that: The angle between the first side wall (12) and the first direction is X, the angle between the second side wall (32) and the first direction is Y, and X>Y.

7. The battery pack according to claim 5, characterized in that: The angle between the first side wall (12) and the first direction is X, the angle between the second side wall (32) and the first direction is Y, 60°≤X≤80°; and\or, 20°≤Y≤40°.

8. The battery pack according to claim 7, characterized in that: 65°≤X≤75°; and\or, 25°≤Y≤35°.

9. The battery pack according to claim 5, characterized in that: The collapse space (50) further includes a second collapse sub-space (502), and the reinforcing plate (201) further includes a third side wall (22) connected to the third connecting edge (21), and the second collapse sub-space (502) is defined between the third side wall (22) and the second side wall (32).

10. The battery pack according to claim 9, characterized in that: The third side wall (22) extends obliquely along a first direction in a direction away from the third connecting edge (21) and the second side wall (32).

11. The battery pack according to claim 10, characterized in that: The included angle between the third side wall (22) and the first direction is Z, the included angle between the second side wall (32) and the first direction is Y, and Z=2Y.

12. The battery pack according to claim 10, characterized in that: The included angle between the third side wall (22) and the first direction is Z, 50°≤Z≤70°.

13. The battery pack according to claim 12, characterized in that: 55°≤Z≤65°。 14. The battery pack according to any one of claims 1 to 13, characterized in that: Each battery cell (701) in the battery pack (70) is provided with a pole (71) arranged toward the connecting fitting portion (25); in the first direction, the pole (71) is located in the collapse space (50) and is spaced apart from the connecting fitting portion (25).

15. The battery pack according to claim 14, characterized in that: The battery pack comprises a fixed connection hole (101) that passes through the first connection edge (11), the second connection edge (31) and the third connection edge (21), and the battery pack further comprises a fixed connection member (63), wherein the fixed connection member (63) is installed in the fixed connection hole (101).

16. The battery pack according to claim 15, characterized in that: In the first direction, the minimum distance between the central axis of the fixed connection member (63) and the inner edge of the connection matching portion (25) facing the pole (71) is A, the minimum distance between the inner edge of the connection matching portion (25) facing the pole (71) and the pole (71) is B, and the minimum distance between the central axis of the fixed connection member (63) and the first end of the battery cell (701) provided with the pole (71) is C. Among them, 1 / 3B≤A≤1 / 2C.

17. The battery pack according to claim 16, characterized in that: 40mm≤B≤70mm, and\or, 90mm≤C≤130mm.

18. The battery pack according to claim 14, characterized in that: It also includes a bottom guard plate (202), the reinforcing plate (201) is an annular reinforcing plate (201), and the bottom guard plate (202) is arranged on a side of the reinforcing plate (201) facing away from the lower cover (3) and covers the middle part of the annular reinforcing plate (201).

19. The battery pack according to claim 15, characterized in that: The reinforcing plate (201) further comprises a supporting portion (23) connected to the third connecting edge (21); the supporting portion (23) is located on a side of the lower cover portion (3) facing away from the upper cover portion (10); and in the first direction, the first end of the battery cell (701) provided with the pole (71) is located between the outer end and the inner end of the supporting portion (23).

20. The battery pack according to claim 19, characterized in that: In the first direction, the minimum distance between the central axis of the fixed connection member (63) and the first end is C, and the maximum distance between the first end and the inner end of the support portion (23) is D. Among them, 1 / 2C≥D≥1 / 3C.

21. The battery pack according to claim 20, characterized in that: 90mm≤C≤130mm.

22. An electrical equipment, characterized in that: Comprising a battery pack according to any one of claims 1-21.

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