Battery pack and electric device

Abstract

The invention provides a battery pack and a power utilization device, and relates to the technical field of batteries, the battery pack comprises a frame and a plurality of battery monomers, the frame comprises a first supporting plate and a second supporting plate which are oppositely arranged at intervals in the Z direction, and a heat exchange structure extending in the Z direction is arranged between the first supporting plate and the second supporting plate; the first supporting plate, the second supporting plate and the heat exchange structure are of an integrated structure, and the frame forms a containing area on at least one side of the heat exchange structure in the Y direction. And the plurality of single batteries are sequentially stacked in the accommodating area in a manner that the large surface sides face the first supporting plate or the second supporting plate. According to the battery pack, the framework is arranged in the Y direction, so that the accommodating area for stacking the large-surface sides of the battery monomers upwards or downwards is formed in the framework along the Y direction, the battery monomers can be accumulatively mounted in the height space in the Z direction, the space utilization rate in the Z direction is improved, meanwhile, a heat exchange structure is integrated on the framework, the integration degree of the framework is improved, and the mounting efficiency of the battery pack is improved.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a battery pack and an electrical device. Background Art

[0002] With the development of new energy vehicles, power batteries used in new energy vehicles have become particularly important. Battery packs are an important component of power batteries. Existing battery packs are box-type structures, that is, existing battery packs include a box and multiple battery cells. The battery cells are usually placed vertically in the box. However, if more battery cells need to be arranged, the box will be too large and occupy a large area, and the vertical space utilization of the battery pack is not high. Summary of the invention

[0003] The purpose of the present application is to provide a battery pack and an electrical device to solve the technical problem of low vertical space utilization of battery packs in the prior art.

[0004] To achieve the above purpose, the technical solution adopted in this application is:

[0005] In the first aspect, the present application provides a battery pack, comprising: a frame and a plurality of battery cells, the frame comprising a first support plate and a second support plate arranged relatively spaced apart along the Z direction, a heat exchange structure extending along the Z direction is provided between the first support plate and the second support plate, wherein the first support plate, the second support plate and the heat exchange structure are an integrated structure, and the frame forms a accommodating area on at least one side of the heat exchange structure along the Y direction; the Z direction is the vertical direction or height direction of the frame, and the Y direction is the width direction of the frame; a plurality of battery cells are stacked in sequence in the accommodating area with the large surface side facing the first support plate or the second support plate.

[0006] In one or more embodiments of the present application, the frame further includes a third support plate, which extends along the Z direction and is connected to the first support plate and the second support plate and is located outside the first support plate and the second support plate in the Y direction, and a plurality of third support plates are arranged at intervals along the X direction of the frame, and the third support plate, the first support plate, the second support plate and the heat exchange structure are an integrated structure; the X direction is the length direction of the frame;

[0007] When the battery cells are installed in the accommodating area, the third support plate is used to compress a row of battery cells stacked along the Z direction.

[0008] In one or more embodiments of the present application, the accommodating area is provided with multiple layers of accommodating cavities at intervals along the Z direction, and two adjacent layers of accommodating cavities are separated by a partition, and the partition is arranged parallel to the first support plate or the second support plate, and each layer of accommodating cavity is used to accommodate at least one battery cell, wherein the partition, the third support plate, the first support plate, the second support plate and the heat exchange structure are an integrated structure;

[0009] A connecting end extends from the outer sides of the first support plate, the second support plate and the partition along the Y direction, and the connecting end is connected to the side of the third support plate toward the accommodating cavity, so that there is a gap between the third support plate and the battery cell in the accommodating cavity, and a sealing member is provided in the gap, and the sealing member is provided on the upper side and / or the lower side of the connecting end along the Z direction and is stopped between the third support plate and the battery cell.

[0010] In one or more embodiments of the present application, heat exchange channels that allow heat exchange medium to flow are provided in the heat exchange structure and are spaced apart along the Z direction, and the battery cells in each layer of the accommodating cavity are in contact with at least one heat exchange channel for heat exchange.

[0011] In one or more embodiments of the present application, the thickness of the third support plate is a, the thickness of the second support plate is b, and the thickness of the first support plate and the partition plate are both c, satisfying: b>a>c, and b=(a+c) / 2, wherein 3mm≤a≤3.5mm, 2.5mm≤c≤3mm,

[0012] The thickness of the side wall of the heat exchange channel and the partition plate between two adjacent heat exchange channels is d, and d satisfies: a≤d≤1.1a.

[0013] In one or more embodiments of the present application, it also includes:

[0014] A thermal pad is provided between the side wall of the heat exchange channel and the battery cells in the accommodating cavity, and the length of the thermal pad can cover all the battery cells in each layer of the accommodating cavity;

[0015] A first insulating pad is provided on the large surface side of each battery cell, and the first insulating pad is a ring-shaped structure;

[0016] The second insulating pad is arranged between two battery cells adjacent to each other along the X direction.

[0017] In one or more embodiments of the present application, the pole of the battery cell is located on the side of the battery cell close to the third support plate, and the explosion-proof valve of the battery cell is located on the side of the battery cell close to the heat exchange structure; the battery pack further includes:

[0018] A circuit board is arranged on a side of the third support plate away from the battery cell;

[0019] The poles of two adjacent battery cells along the Z direction and / or along the X direction are connected via a bus bar, and a plurality of collecting plates connected to the bus bar are provided on both sides of the circuit board along the X direction.

[0020] In one or more embodiments of the present application, it also includes:

[0021] The insulating cover comprises a first insulating cover and a second insulating cover, the second insulating cover is arranged at both ends of the frame along the X direction, the second insulating cover is provided with an opening for avoiding the heat exchange structure, the first insulating cover is arranged between two adjacent third support plates and is arranged on the frame in an inverted U-shaped structure, and the sides of the first insulating cover and the second insulating cover are connected to the sides of the third support plates;

[0022] The first insulating protective cover and the second insulating protective cover are provided with avoidance holes for avoiding the collecting sheet.

[0023] In one or more embodiments of the present application, the heat exchange structure is connected to a liquid cooling heat exchange system and / or an air cooling heat exchange system to introduce a heat exchange medium into the heat exchange channel;

[0024] When the heat exchange structure is connected to the liquid cooling heat exchange system, the battery cells in each layer of the accommodating cavity are in contact with at least two heat exchange channels for heat exchange; an inlet and outlet liquid interface assembly is connected to at least one end of the heat exchange channel of the heat exchange structure, and the inlet and outlet liquid interface assembly is used to make the heat exchange medium form a circuitous flow in the heat exchange channel corresponding to each layer of the accommodating cavity; the inlet and outlet liquid interface assembly includes a diverter block, a connecting water nozzle and an inlet and outlet liquid pipe, wherein the diverter block is provided with a diverter port connected to each heat exchange channel, and a plurality of connecting ports for connecting the connecting water nozzles are spaced apart on one side of the diverter block away from the diverter port, and the inlet and outlet liquid pipes are connected to the connecting water nozzles;

[0025] and / or,

[0026] When the heat exchange structure is connected to the air-cooled heat exchange system, the battery cells in each layer of the accommodating cavity are in contact with at least one heat exchange channel for heat exchange; and a first exhaust hole is provided on the side wall of the heat exchange channel, and a second exhaust hole corresponding to the first exhaust hole is provided on the thermal conductive pad, and the first exhaust hole and the second exhaust hole both correspond to the explosion-proof valve setting of the battery cell.

[0027] In a second aspect, the present application further provides an electrical device, comprising the battery pack described in any one of the first aspects above.

[0028] Based on the above technical solution, a battery pack and an electric device provided by the present application have at least the following beneficial technical effects:

[0029] The battery pack provided in the embodiment of the present application includes a frame and a plurality of battery cells, wherein the frame includes a first support plate and a second support plate arranged at a relative interval along the Z direction, and a heat exchange structure extending along the Z direction is provided between the first support plate and the second support plate, wherein the first support plate, the second support plate and the heat exchange structure are an integrated structure, and the frame forms a receiving area on at least one side of the heat exchange structure along the Y direction; and a plurality of battery cells are stacked in the receiving area in sequence with the large surface side facing the first support plate or the second support plate. Then, the frame is formed along the Y direction with a receiving area in which the large surface side of the battery cells is stacked upward or downward, so that the battery cells can be cumulatively installed in the Z direction height space, thereby improving the space utilization in the Z direction, and at the same time, the heat exchange structure is integrated on the frame, thereby improving the integration of the frame and the installation efficiency of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0031] Figure 1 It is a schematic diagram of the three-dimensional structure of the battery pack provided in this application.

[0032] Figure 2 It is a schematic diagram of the explosion structure of the battery pack provided in this application.

[0033] Figure 3 yes Figure 2 Enlarged view of point A.

[0034] Figure 4 yes Figure 2 Enlarged view of point B.

[0035] Figure 5 It is a structural schematic diagram of the blocking member provided in this application.

[0036] Figure 6 It is a left-view structural diagram of the framework provided by this application.

[0037] Figure 7 It is a three-dimensional structural schematic diagram of the framework provided in this application.

[0038] Figure 8 It is a schematic diagram of the top view structure of a battery cell in the battery pack provided in this application.

[0039] Fig. 9 yes Figure 8 Enlarged view of point C.

[0040] Fig.10It is a structural schematic diagram of the connection between multiple battery cells and a thermal pad, a first insulating pad and a second insulating pad in the battery pack provided by the present application.

[0041] Fig.11 It is a structural schematic diagram of an inlet and outlet liquid interface assembly provided by an embodiment of the present application.

[0042] Fig.12 It is a schematic diagram of the exploded structure of the liquid inlet and outlet interface assembly provided in one embodiment of the present application.

[0043] Fig.13 It is a schematic longitudinal section diagram of a heat exchange structure provided in one embodiment of the present application.

[0044] Fig.14 yes Fig.13 A magnified view of the middle area.

[0045] Fig.15 It is a schematic diagram of the three-dimensional structure of the battery pack provided in this application.

[0046] Fig.16 It is a schematic diagram of the explosion structure of a battery pack provided in another embodiment of the present application.

[0047] Fig.17 It is a schematic diagram of the three-dimensional structure of a frame provided in another embodiment of the present application.

[0048] Fig.18 It is a structural schematic diagram of the connection between multiple battery cells, a circuit board and a bus in a battery pack provided by another embodiment of the present application.

[0049] Fig.19 It is a schematic diagram of the connection structure between the circuit board and the bus in the battery pack provided in this application.

[0050] Fig. 20 It is a longitudinal cross-sectional view of the battery pack provided in this application.

[0051] Fig.21 It is a schematic diagram of the exploded structure of the battery cell and the thermal pad in the battery pack provided by the present application.

[0052] Fig. 22 It is a three-dimensional structural schematic diagram from the perspective of a battery cell and a thermal pad in a battery pack provided by the present application.

[0053] Fig.23 It is a schematic diagram of the three-dimensional structure of a battery cell in the battery pack provided in this application.

[0054] Fig.24 It is a schematic diagram of the structure of the first insulating cover in the battery pack provided in this application.

[0055] Fig.25It is a schematic diagram of the structure of the second insulating cover in the battery pack provided in this application.

[0056] In the figure: 1-frame; 2-battery cell; 3-thermal pad; 4-circuit board; 5-bus; 6-insulating cover; 7-inlet and outlet liquid interface assembly; 11-first support plate; 12-second support plate; 13-heat exchange structure; 14-accommodating area; 15-third support plate; 16-connecting end; 17-blocking piece; 18-first exhaust hole; 21-first insulating pad; 22-second insulating pad; 23-explosion-proof valve; 24-pole; 31-second Exhaust hole; 41-collection plate; 51-vertical bus; 52-horizontal bus; 53-positive and negative bus; 61-first insulating cover; 62-second insulating cover; 63-avoidance hole; 71-diverter block; 72-connecting nozzle; 73-inlet and outlet liquid pipes; 131-heat exchange channel; 141-partition; 142-accommodating chamber; 170-main body; 171-insertion part; 621-opening; 711-diverter port; 712-connecting port. DETAILED DESCRIPTION

[0057] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0058] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0059] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0060] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0061] In the related art, the battery pack box usually requires the battery cells to be placed vertically in the box. If more battery cells need to be arranged, the box will be too large, occupying a large area, and the vertical space utilization of the battery pack is not high. In addition, the existing battery pack liquid cooling system is generally a separate component that needs to be installed separately, which affects the installation efficiency.

[0062] Based on the above considerations, in order to solve the technical problem of low vertical space utilization of battery packs in the prior art. The present application provides a battery pack, including a frame and a plurality of battery cells, the frame including a first support plate and a second support plate arranged relatively spaced along the Z direction, a heat exchange structure extending along the Z direction is provided between the first support plate and the second support plate, wherein the first support plate, the second support plate and the heat exchange structure are an integrated structure, and the frame forms a receiving area on at least one side of the heat exchange structure along the Y direction; a plurality of battery cells are stacked in sequence in the receiving area with the large surface side facing the first support plate or the second support plate. In the technical solution of the present application, the frame is formed along the Y direction to form a receiving area in which the large surface side of the battery cells is stacked upward or downward, so that the battery cells can be installed cumulatively in the height space in the Z direction, thereby improving the space utilization in the Z direction, and at the same time, the heat exchange structure is integrated on the frame, thereby improving the integration of the frame and the installation efficiency of the battery pack.

[0063] The battery pack of the present application refers to a physical module including one or more battery modules to provide higher voltage and capacity. The battery pack disclosed in the present application is suitable for various electrical devices using batteries, and the electrical devices may be but are not limited to mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, electric toys may include fixed or mobile electric toys, for example, game consoles, electric car toys, electric ship toys, electric airplane toys, etc., and spacecraft may include airplanes, rockets, space shuttles, spacecraft, etc.

[0064] The technical solution of the present application is described in detail below in conjunction with the accompanying drawings.

[0065] Please refer to Figures 1 to 7 The embodiment of the present application provides a battery pack, comprising: a frame 1 and a plurality of battery cells 2, the frame 1 comprising a first support plate 11 and a second support plate 12 arranged relatively spaced apart along the Z direction, a heat exchange structure 13 extending along the Z direction is provided between the first support plate 11 and the second support plate 12, wherein the first support plate 11, the second support plate 12 and the heat exchange structure 13 are an integrated structure, and the frame 1 forms a receiving area 14 on at least one side of the heat exchange structure 13 along the Y direction; the plurality of battery cells 2 are stacked in the receiving area 14 in sequence with the large surface side facing the first support plate 11 or the second support plate 12.

[0066] Wherein, the Z direction may be the vertical direction or the height direction of the frame 1. The Y direction may be the width direction of the frame 1. The first support plate 11 and the second support plate 12 may be the top plate and the bottom plate of the frame 1 in the Z direction, respectively. The frame 1 may be integrally extruded. The heat exchange structure 13 is used to perform heat exchange on the battery cell 2 to maintain a stable temperature of the battery cell 2. A plurality of battery cells 2 may be connected in series, in parallel, or in mixed connection, and mixed connection means that a plurality of battery cells 2 are both connected in series and in parallel. A plurality of battery cells 2 may be directly connected in series, in parallel, or in mixed connection. Wherein, each battery cell 2 may be a secondary battery. The battery cell 2 may be a flat body or a rectangular parallelepiped, etc. The large surface side of the battery cell 2 may be the two sides in the thickness direction of the battery cell 2.

[0067] In the technical solution of the embodiment of the present application, the frame 1 is formed along the Y direction to form a accommodating area 14 for stacking the battery cells 2 with the large surface side facing upward or downward, so that the battery cells 2 can be installed cumulatively in the height space in the Z direction, thereby improving the space utilization in the Z direction. At the same time, the heat exchange structure 13 is integrated on the frame 1, which improves the integration of the frame 1 and the installation efficiency of the battery pack.

[0068] Please refer to Figure 7 In some embodiments, the accommodating area 14 is formed on both sides of the frame 1 along the Y direction, so that the battery cells 2 can be accommodated on both sides of the frame 1. At the same time, the heat exchange structure 13 can also perform heat exchange on the battery cells 2 on both sides at the same time.

[0069] Please refer to Figure 6 and Figure 7 as well as Fig.16 and Fig.17 In some embodiments, the frame 1 further includes a third support plate 15, which extends along the Z direction and is connected to the first support plate 11 and the second support plate 12 and is located on the outside thereof along the Y direction, and a plurality of third support plates 15 are arranged at intervals along the X direction of the frame 1, and the third support plate 15, the first support plate 11, the second support plate 12 and the heat exchange structure 13 are an integrated structure; when the battery cell 2 is installed in the accommodating area 14, the third support plate 15 is used to press a row of battery cells 2 stacked along the Z direction.

[0070] The X direction may be the length direction of the frame 1. Figure 7The third support plate 15 is located on the outside of the frame 1 in the Y direction, and is a plate-shaped plate used to compress and fix a row of battery cells 2 stacked in the Z direction. Since multiple rows of battery cells 2 can be arranged along the X direction, that is, the length direction of the frame 1, for example, two rows, three rows, four rows, five rows or more, they can be arranged according to the required capacity of the battery pack. Therefore, the frame 1 can be provided with multiple third support plates 15 corresponding to each row of battery cells 2 along the X direction. The third support plate 15 can be formed by milling on both sides of the frame 1, milling off the side walls, and leaving the third support plate 15.

[0071] In the technical solution of the embodiment of the present application, a third support plate 15 is provided on the frame 1 so that the third support plate 15 can support and press the battery cell 2 to improve the stability of the battery cell 2 .

[0072] Please refer to Figure 2 , Figure 3 and Figure 6 as well as Fig.16 and Fig.17 In some embodiments, the accommodating area 14 is provided with multiple layers of accommodating cavities 142 spaced apart along the Z direction, and two adjacent layers of accommodating cavities 142 are spaced apart by a partition 141, and the partition 141 is arranged parallel to the first support plate 11 or the second support plate 12, and each layer of accommodating cavities 142 is used to accommodate at least one battery cell 2, wherein the partition 141, the third support plate 15, the first support plate 11, the second support plate 12 and the heat exchange structure 13 are an integrated structure. In some embodiments, a layer of battery cells 2 is accommodated between each layer of accommodating cavities 142.

[0073] In the technical solution of the embodiment of the present application, through the above-mentioned configuration, the partition 141 can play a role in supporting the battery cell 2, and at the same time can enhance the structural strength of the frame 1 to ensure the stability of the entire battery pack.

[0074] Please refer to Figure 3 and Figure 4 as well as Fig.17 In some embodiments, the first support plate 11, the second support plate 12 and the partition plate 141 extend the connection end 16 outward along the Y direction, and the third support plate 15 is connected to the connection end 16 on one side of the accommodating cavity 142, so that there is a gap between the third support plate 15 and the battery cell 2 in the accommodating cavity 142, please refer to Figure 4 , Figure 5 , Fig. 9 and Fig. 20 A blocking member 17 is provided in the gap. The blocking member 17 is provided on the upper side and / or the lower side of the connecting end 16 along the Z direction and is stopped between the third supporting plate 15 and the battery cell 2 .

[0075] It can be understood that the connection end 16 is a structural member that protrudes outward along the Y direction by the first support plate 11, the second support plate 12 and the partition plate 141. The position where the connection end 16 connects to the third support plate 15 avoids the pole 24 of the battery cell 2 to avoid obstructing the electrical connection of the pole 24. The blocking member 17 corresponds to the end of each battery cell 2 and is arranged at the connection end 16 on the upper and lower sides. The blocking member 17 can have good elastic properties and can be made of insulating rubber. In some embodiments, please refer to Figure 5 The sealing member 17 includes a main body 170 and an insertion portion 171. The insertion portion 171 is a structural member protruding outward from the side edge of the main body 170. The insertion portion 171 is inserted into the upper and lower sides of the battery cell 2 with the upper and lower sides of the large surface side of the battery cell 2. At this time, the main body 170 can be pressed tightly in the gap between the third support plate 15 and the battery cell 2.

[0076] In the technical solution of the embodiment of the present application, through the above arrangement, the blocking member 17 is inserted into the gap between the third support plate 15 and the battery cell 2 , so that the battery cell 2 is firmly stuck in the accommodating cavity 142 .

[0077] Please refer to Figure 6 and Figure 7 as well as Fig.16 and Fig.17 The heat exchange structure 13 is provided with heat exchange channels 131 spaced along the Z direction to allow the heat exchange medium to flow, and the battery cells 2 in each layer of the accommodating cavity 142 are in contact with at least one heat exchange channel 131 for heat exchange.

[0078] In the technical solution of the embodiment of the present application, the above arrangement is adopted so that the battery cell 2 can directly contact the heat exchange channel 131 , and perform heat exchange with the battery cell 2 through the heat exchange medium in the heat exchange channel 131 , thereby improving the heat exchange efficiency.

[0079] Please refer to Figure 6 In some embodiments, the thickness of the third support plate 15 is a, the thickness of the second support plate 12 is b, and the thickness of the first support plate 11 and the partition plate 141 are both c, satisfying: b>a>c, and b=(a+c) / 2, wherein 3mm≤a≤3.5mm, a can be 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm. 2.5mm≤c≤3mm, c can be 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm. The thickness of the side wall of the heat exchange channel 131 and the partition plate of two adjacent heat exchange channels 131 are both d, and d satisfies: a≤d≤1.1a.

[0080] In the technical solution of the embodiment of the present application, the above arrangement is adopted to ensure the structural strength of the frame 1, so that the frame 1 is mainly loaded by the third support plate 15 and the heat exchange channel 131. The partition plate between two adjacent heat exchange channels 131 can also act as a reinforcing rib for the frame 1, thereby improving the structural strength of the frame 1.

[0081] Please refer to Figure 8 , Fig. 9 and Fig.10 as well as Fig.21 In some embodiments, the battery pack further includes: a thermal pad 3 , which is disposed between the side wall of the heat exchange channel 131 and the battery cells 2 in the accommodating cavity 142 , and the length of the thermal pad 3 can cover all the battery cells 2 in each layer of the accommodating cavity 142 .

[0082] It can be understood that the length of the thermal pad 3 is not less than the length of all the battery cells 2 in each layer of the accommodating cavity 142 .

[0083] In the technical solution of the embodiment of the present application, a thermal pad 3 is provided between the side wall of the heat exchange channel 131 and the battery cell 2. On the one hand, the thermal pad 3 can improve the heat exchange effect between the heat exchange medium in the heat exchange channel 131 and the battery cell 2. On the other hand, the thermal pad 3 plays a buffering role, which can protect the battery cell 2 and prevent the battery cell 2 from directly contacting the side wall of the heat exchange channel 131 and puncturing the insulating film of the battery cell 2 to cause damage.

[0084] Please refer to Fig. 9 In some embodiments, the battery pack further includes: a first insulating pad 21 and a second insulating pad 22, wherein the first insulating pad 21 is disposed on the large surface side of each battery cell 2, and the first insulating pad 21 is a ring-shaped structure; the second insulating pad 22 is disposed between two adjacent battery cells 2 along the X direction.

[0085] The first insulating pad 21 may be a silicone pad, and the second insulating pad 22 may be a silicone pad.

[0086] In the technical solution of the embodiment of the present application, the first insulating pad 21 is bonded to the large surface side of the battery cell 2, and the second insulating pad 22 is bonded between the side surfaces of the adjacent battery cells 2 along the X direction. Thus, the first insulating pad 21 and the second insulating pad 22 are used to insulate the space between two adjacent battery cells 2 and between the battery cell 2 and the partition 141.

[0087] Please refer to Fig. 20 In some embodiments, the thickness of the insertion portion 171 of the sealing member 17 is consistent with the thickness of the first insulating pad 21, so that after the sealing member 17 is inserted into the battery cell 2, the sealing member 17, the first insulating pad 21 and the battery cell 2 can be pressed tightly into the accommodating cavity 142.

[0088] Please refer to Fig. 9 and Fig.10 In some embodiments, the pole 24 of the battery cell 2 is located on a side of the battery cell 2 close to the third support plate 15 , and the explosion-proof valve 23 of the battery cell 2 is located on a side of the battery cell 2 close to the heat exchange structure 13 .

[0089] In the technical solution of the embodiment of the present application, the above-mentioned arrangement is used to facilitate the electrical connection of the pole 24 of the battery cell 2 located on the outside, and the explosion-proof valve 23 of the battery cell 2 is arranged toward the side of the heat exchange structure 13. When a battery cell 2 has thermal runaway, the heat exchange medium of the heat exchange structure 13 can be used to cool the thermal runaway gas to avoid heat spread.

[0090] Please refer to Figure 4 , Fig.15 , Fig.18 and Fig.19 In some embodiments, the battery pack further comprises: a circuit board 4, which is arranged on the side of the third support plate 15 away from the battery cell 2; the poles 24 of two adjacent battery cells 2 along the Z direction and / or along the X direction are connected by a bus 5, and a plurality of collection sheets 41 connected to the bus 5 are arranged on both sides of the circuit board 4 along the X direction. In some embodiments, please refer to Fig.19 The busbar 5 includes a vertical busbar 51, a transverse busbar 52 and a positive and negative busbar 53. The vertical busbar 51 is used to electrically connect the poles 24 of two adjacent battery cells 2 in the Z direction to realize the series electrical connection of each column of battery cells 2. The transverse busbar 52 is used to connect the poles 24 of two battery cells 2 in the X direction in two adjacent columns of battery cells 2 after each column of battery cells 2 is electrically connected through the vertical busbar 51. The positive and negative busbar 53 is used to connect the poles 24 of the battery cells 2 at the head end and the tail end to the outside to realize the series electrical connection of all battery cells 2. The circuit board 4 is a circuit board with a built-in sampling circuit. The circuit board 4 is fixed on the third support plate 15, can extend along the length direction of the third support plate 15, and is connected to each busbar 5 through the collection sheet 41. In order to collect the sampling signal of each battery cell 2 and transmit the sampling signal to the battery management system. The sampling signal may be an electrical signal representing the working parameters of the battery cell 2 , such as a voltage signal, a temperature signal, an internal resistance signal, etc.

[0091] Please refer to Figure 2 , Fig.15 , Fig.16 , Fig.24 and Fig.25In some embodiments, the battery pack further includes: an insulating cover 6, the insulating cover 6 includes a first insulating cover 61 and a second insulating cover 62, the second insulating cover 62 is covered at both ends of the frame 1 along the X direction, the second insulating cover 62 is provided with an opening 621 for avoiding the heat exchange structure 13, the first insulating cover 61 is provided between two adjacent third support plates 15 and is covered on the frame 1 in an inverted U-shaped structure, the sides of the first insulating cover 61 and the second insulating cover 62 are connected to the sides of the third support plate 15; the first insulating cover 61 and the second insulating cover 62 are provided with avoidance holes 63 for avoiding the collection sheet 41.

[0092] The collecting sheet 41 is bent so that one end is connected to the pole 24 and the other end is connected to the circuit board 4 through the avoidance hole 63. The first insulating cover 61 and the second insulating cover 62 are bonded to the contact edge of the third supporting plate 15.

[0093] In the technical solution of the embodiment of the present application, through the above-mentioned configuration, the internal battery cell 2 is protected by the cooperation of the insulating cover 6 and the third support plate 15, thereby playing a protective role, while saving space and avoiding excessive space.

[0094] In some embodiments, the heat exchange structure 13 of the present application is connected to a liquid cooling heat exchange system and / or an air cooling heat exchange system to introduce a heat exchange medium into the heat exchange channel 131 to achieve the purpose of heat exchange between the heat exchange medium in the heat exchange channel 131 and the battery cell.

[0095] Please refer to Figure 6 as well as Figures 11 to 14 In some embodiments, the heat exchange structure 13 is connected to a liquid cooling heat exchange system. When the heat exchange structure 13 is connected to the liquid cooling heat exchange system, the battery cells 2 in each layer of the accommodating cavity 142 are in contact with at least two heat exchange channels 131 for heat exchange. At least one end of the heat exchange channel 131 of the heat exchange structure 13 is connected with an inlet and outlet liquid interface component 7, and the inlet and outlet liquid interface component 7 is used to allow the heat exchange medium to form a circuitous flow in the heat exchange channel 131 corresponding to each layer of the accommodating cavity 142.

[0096] In the technical solution of the embodiment of the present application, when connected to a liquid cooling heat exchange system, in order to perform effective heat exchange, the battery cells 2 in each layer of the accommodating cavity 142 are brought into contact with at least two heat exchange channels 131 for heat exchange, and the heat exchange medium is caused to flow in a circuitous manner in the heat exchange channels 131 corresponding to each layer of the accommodating cavity 142 through the liquid inlet and outlet interface assembly 7, so as to prevent the heat exchange medium from flowing directly from one side of the battery cell 2 to the other side, resulting in a large temperature difference between the battery cells 2 on both sides along the X direction.

[0097] Please refer to Figures 11 to 14In some embodiments, the inlet and outlet liquid interface assembly 7 includes a diverter block 71, a connecting water nozzle 72 and an inlet and outlet liquid pipe 73, wherein the diverter block 71 is provided with a diverter port 711 connected to each heat exchange channel 131, and a plurality of connecting ports 712 for connecting the connecting water nozzle 72 are provided at intervals on the side of the diverter block 71 away from the diverter port 711, and the inlet and outlet liquid pipe 73 is connected to the connecting water nozzle 72.

[0098] In order to achieve uniform heat exchange, each layer of the accommodating cavity 142 corresponds to three heat exchange channels 131, for example Figure 6 After each heat exchange channel 131 is connected to the diversion port 711 of the diversion block 71, the three heat exchange channels 131 corresponding to each layer of the accommodating cavity 142 are connected to a connecting nozzle 72 through a connecting port 712, so that the three heat exchange channels 131 can be connected in a circuitous manner and form an S shape, thereby achieving uniform heat exchange of the battery cells 2 in each layer of the accommodating cavity 142.

[0099] In some embodiments, the heat exchange channel 131 of the heat exchange structure 13 is connected to the inlet and outlet liquid interface components 7 at both ends along the X direction, wherein the inlet and outlet liquid pipes 73 of one inlet and outlet liquid interface component 7 serve as the liquid inlet, and the inlet and outlet liquid pipes 73 of the inlet and outlet liquid interface component 7 at the other end serve as the liquid outlet, so as to better achieve uniformity of heat exchange.

[0100] In other embodiments, the heat exchange structure 13 may also be connected to an air-cooled heat exchange system for heat exchange.

[0101] Please refer to Fig.16 , Fig.17 , Fig.21 and Fig. 22 When the heat exchange structure 13 is connected to the air-cooled heat exchange system, the battery cells 2 in each layer of the accommodating cavity 142 are in contact with at least one heat exchange channel 131 for heat exchange; and a first exhaust hole 18 is provided on the side wall of the heat exchange channel 131, and a second exhaust hole 31 corresponding to the first exhaust hole 18 is provided on the thermal pad 3, and the first exhaust hole 18 and the second exhaust hole 31 are both set corresponding to the explosion-proof valve 23 of the battery cell 2.

[0102] In some embodiments, for example Fig.16 and Fig.17 Each layer of accommodating cavity 142 corresponds to a heat exchange channel 131, so that each layer of battery cells 2 in each layer of accommodating cavity 142 corresponds to a heat exchange channel 131 for contact heat exchange. In some embodiments, the air-cooled heat exchange system may include an air-cooled heat exchanger and a pipeline connected to the heat exchange channel 131, and the air-cooled heat exchanger is used to circulate a heat exchange medium into the heat exchange channel 131 through the pipeline to perform heat exchange on the battery cells 2.

[0103] In the technical solution of the embodiment of the present application, through the above arrangement, on the one hand, a heat exchange medium can be introduced into the heat exchange channel 131 through the air-cooled heat exchange system to perform heat exchange on the battery cell 2. At the same time, when thermal runaway occurs in the battery cell 2, the high-temperature gas ejected from the explosion-proof valve 23 can enter the heat exchange channel 131 through the second exhaust hole 31 and the first exhaust hole 18, and perform heat exchange with the heat exchange medium in the heat exchange channel 131. The heat exchange channel 131 can also serve as an exhaust channel for the high-temperature gas.

[0104] In some embodiments, please refer to Fig.23 The explosion-proof valve 23 of the battery cell 2 is set away from the center of the battery cell 2. At this time, the second exhaust hole 31 and the first exhaust hole 18 are set corresponding to the explosion-proof valve 23. This arrangement allows the explosion-proof valves 23 of the two rows of battery cells 2 arranged along the Y direction to be staggered with each other, preventing one of the battery cells 2 from affecting other battery cells 2 when thermal runaway occurs, thereby avoiding heat spread.

[0105] On the other hand, the present application also provides an electrical device, comprising the battery pack described above.

[0106] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A battery pack, characterized in that: include: A frame (1), the frame (1) comprising a first support plate (11) and a second support plate (12) arranged relatively spaced apart along a Z direction, a heat exchange structure (13) extending along the Z direction being provided between the first support plate (11) and the second support plate (12), wherein the first support plate (11), the second support plate (12) and the heat exchange structure (13) are an integrated structure, and the frame (1) forms a receiving area (14) on at least one side of the heat exchange structure (13) along a Y direction; the Z direction is a vertical direction or a height direction of the frame (1), and the Y direction is a width direction of the frame (1); A plurality of battery cells (2) are stacked in sequence in the accommodation area (14) with their large surfaces facing the first support plate (11) or the second support plate (12).

2. The battery pack according to claim 1, characterized in that: The frame (1) further comprises a third support plate (15), the third support plate (15) extending along the Z direction and connected to the first support plate (11) and the second support plate (12) and located on the outer sides thereof along the Y direction, and a plurality of the third support plates (15) are arranged at intervals along the X direction of the frame (1), the third support plate (15), the first support plate (11), the second support plate (12) and the heat exchange structure (13) are an integrated structure; the X direction is the length direction of the frame (1); When the battery cells (2) are installed in the accommodating area (14), the third support plate (15) is used to press a row of the battery cells (2) stacked along the Z direction.

3. The battery pack according to claim 2, characterized in that: The accommodating area (14) is provided with multiple layers of accommodating cavities (142) at intervals along the Z direction, two adjacent layers of the accommodating cavities (142) are separated by a partition (141), the partition (141) is arranged parallel to the first support plate (11) or the second support plate (12), and each layer of the accommodating cavity (142) is used to accommodate at least one of the battery cells (2), wherein the partition (141), the third support plate (15), the first support plate (11), the second support plate (12) and the heat exchange structure (13) are an integrated structure; A connection end (16) extends from the first support plate (11), the second support plate (12) and the partition plate (141) on the outer sides along the Y direction, and the third support plate (15) is connected to the connection end (16) on one side of the accommodating cavity (142), so that a gap exists between the third support plate (15) and the battery cell (2) in the accommodating cavity (142), and a blocking member (17) is provided in the gap, and the blocking member (17) is provided on the upper side and / or the lower side of the connection end (16) along the Z direction and stops between the third support plate (15) and the battery cell (2).

4. The battery pack according to claim 3, characterized in that: The heat exchange structure (13) is provided with heat exchange channels (131) arranged at intervals along the Z direction and allowing the heat exchange medium to flow, and the battery cells (2) in each layer of the accommodating cavity (142) are in contact with at least one of the heat exchange channels (131) for heat exchange.

5. The battery pack according to claim 4, characterized in that: The thickness of the third support plate (15) is a, the thickness of the second support plate (12) is b, and the thickness of the first support plate (11) and the partition plate (141) are both c, satisfying: b>a>c, and b=(a+c) / 2, wherein 3mm≤a≤3.5mm, 2.5mm≤c≤3mm, The thickness of the side wall of the heat exchange channel (131) and the spacer plates between two adjacent heat exchange channels (131) are both d, and d satisfies: a≤d≤1.1a.

6. The battery pack according to claim 4, characterized in that: Also includes: A thermal pad (3) is provided between the side wall of the heat exchange channel (131) and the battery cells (2) in the accommodating cavity (142), the length of the thermal pad (3) being able to cover all the battery cells (2) in each layer of the accommodating cavity (142); A first insulating pad (21) is arranged on the large surface side of each battery cell (2), and the first insulating pad (21) is a ring-shaped structure; The second insulating pad (22) is arranged between two battery cells (2) adjacent to each other along the X direction.

7. The battery pack according to claim 2, characterized in that: The pole (24) of the battery cell (2) is located on a side of the battery cell (2) close to the third support plate (15), and the explosion-proof valve (23) of the battery cell (2) is located on a side of the battery cell (2) close to the heat exchange structure (13); the battery pack further comprises: A circuit board (4) is arranged on a side of the third support plate (15) away from the battery cell (2); the poles (24) of two adjacent battery cells (2) along the Z direction and / or along the X direction are connected via a bus bar (5), and a plurality of collection sheets (41) connected to the bus bar (5) are provided on both sides of the circuit board (4) along the X direction.

8. The battery pack according to claim 7, characterized in that: Also includes: An insulating protective cover (6), the insulating protective cover (6) comprising a first insulating protective cover (61) and a second insulating protective cover (62), the second insulating protective cover (62) being arranged at both ends of the frame (1) along the X direction, the second insulating protective cover (62) being provided with an opening (621) for avoiding the heat exchange structure (13), the first insulating protective cover (61) being arranged between two adjacent third support plates (15) and being arranged on the frame (1) in an inverted U-shaped structure, the sides of the first insulating protective cover (61) and the second insulating protective cover (62) being connected to the sides of the third support plate (15); The first insulating protective cover (61) and the second insulating protective cover (62) are provided with avoidance holes (63) for avoiding the collection sheet (41).

9. The battery pack according to claim 6, characterized in that: The heat exchange structure (13) is connected to a liquid cooling heat exchange system and / or an air cooling heat exchange system so as to allow heat exchange medium to flow into the heat exchange channel (131); When the heat exchange structure (13) is connected to the liquid cooling heat exchange system, the battery cells (2) in each layer of the accommodating cavity (142) are in contact with at least two of the heat exchange channels (131) for heat exchange; at least one end of the heat exchange channel (131) of the heat exchange structure (13) is connected to an inlet and outlet liquid interface component (7), and the inlet and outlet liquid interface component (7) is used to allow the heat exchange medium to form a circuitous flow in the heat exchange channel (131) corresponding to each layer of the accommodating cavity (142). reflux; the inlet and outlet liquid interface assembly (7) comprises a diverter block (71), a connecting water nozzle (72) and an inlet and outlet liquid pipe (73), wherein the diverter block (71) is provided with a diverter port (711) connected to each of the heat exchange channels (131), a plurality of connecting ports (712) for connecting the connecting water nozzle (72) are provided at intervals on a side of the diverter block (71) away from the diverter port (711), and the inlet and outlet liquid pipe (73) is connected to the connecting water nozzle (72); and / or, When the heat exchange structure (13) is connected to the air-cooled heat exchange system, the battery cells (2) in each layer of the accommodating cavity (142) are in contact with at least one of the heat exchange channels (131) for heat exchange; and a first exhaust hole (18) is provided on the side wall of the heat exchange channel (131), and a second exhaust hole (31) corresponding to the first exhaust hole (18) is provided on the thermal pad (3), and the first exhaust hole (18) and the second exhaust hole (31) are both arranged corresponding to the explosion-proof valve (23) of the battery cell (2).

10. An electrical device, characterized in that: A battery pack comprising any one of claims 1 to 9.

Images