CN117712607A - Battery pack upper cover and battery pack - Google Patents

Abstract

The application discloses battery package upper cover and battery package, battery package upper cover includes: the top plate, the second week curb plate of connecting in top plate week side border and a plurality of islands that distribute on the surface of top plate and/or second week curb plate, the inside surface of top plate and second week curb plate is the depressed part corresponding to island's position. At least a portion of the islands extend from the top plate to the second peripheral side plate, and at least the islands extending to the second peripheral side plate are provided at each corner of the top plate. Wherein the top plate, the second peripheral side plate and the islands are formed by punching a metal body, or the top plate, the second peripheral side plate and the islands are plastic members formed by injection molding. The battery package upper cover protrusion of this application sets up a plurality of islands, and at least part island extends to the second week curb plate by the roof, has strengthened holistic structural strength, effectually reduced resonance and the noise of battery package upper cover, and roof, second week curb plate and each island pass through metal body punching press or plastics and mould plastics and form an organic whole, and structural strength is high, and manufacturing process is simple.

Description

Battery pack upper cover and battery pack

Technical Field

The invention relates to the technical field of battery packs, in particular to a battery pack upper cover and a battery pack.

Background

The battery pack in the prior art comprises a main shell, a battery module and an upper cover, wherein a cavity is formed in the main shell, and the battery module is arranged in the cavity. The upper cover includes the roof and connects in the second week curb plate at roof week side border, and roof and second week curb plate are the flat plate body in general, and its surface does not have concave-convex structure, and structural strength is very low, takes place to warp easily, and its natural frequency of vibration is lower, and at road walking in-process, the upper cover of battery package produces resonance easily, produces the noise, and the serious case probably makes the upper cover break away from inefficacy, can not play the effect of protecting battery module in the battery package, exists the potential safety hazard.

In view of this, the present invention has been made.

Disclosure of Invention

The invention provides a battery pack upper cover and a battery pack.

The invention adopts the following technical scheme:

a first object of the present application is to provide a battery pack upper cover, comprising:

the device comprises a top plate, a second peripheral side plate connected to the peripheral side edge of the top plate and a plurality of islands distributed on the outer surface of the top plate and/or the second peripheral side plate, wherein the parts of the inner surfaces of the top plate and the second peripheral side plate corresponding to the islands are concave parts;

at least a portion of the islands extend from the top plate to the second peripheral side plate, and at least the islands extending to the second peripheral side plate are provided at each corner of the top plate;

the top plate, the second peripheral side plate and the islands are formed by stamping a metal body, or the top plate, the second peripheral side plate and the islands are plastic pieces formed by injection molding.

Optionally, the side lines of each island include an arc line and/or a broken line.

Optionally, the battery pack upper cover includes a first island, and the first island includes a main island and a plurality of extending islands;

the main islands are positioned on the outer surface of the top plate, are closed annular, and are arranged close to the edges of the top plate;

each extending island is sequentially arranged at intervals along the circumferential direction of the main island, the uniform end of each extending island is connected with the main island, and the other end of each extending island extends to the edge of the top plate or extends to the second peripheral side plate.

Optionally, the top plate is located inside the main island to form a pit, and the pit is located at a middle position of the top plate.

Optionally, a plurality of second islands are arranged in the pit, and each second island is distributed at different positions of the pit;

each of the second islands has a smaller area than the first islands.

Optionally, the pit includes a main pit and a narrow pit extending from the main pit to the top plate edge.

Optionally, the width of at least a portion of the extended island is gradually reduced in a direction from the main island to the second peripheral side plate.

Optionally, each of the extending islands includes four first extending islands and a plurality of second extending islands, a plurality of second extending islands are disposed between adjacent first extending islands, and each of the second extending islands extends to an edge of the top plate or extends to the second peripheral side plate, respectively;

each first extending island extends to a corresponding corner on the top plate and two second peripheral side plates at two sides of the corner.

Optionally, the battery pack upper cover includes a plurality of independent third islands;

the third island extends from the second perimeter side panel to the top panel;

the third islands have a larger area on the second peripheral side panel than on the top panel.

A second object of the present application is to provide a battery pack including the battery pack upper cover as described above.

By adopting the technical scheme, the invention has the following beneficial effects:

the battery package upper cover protrusion of this application sets up a plurality of islands, and at least part island extends to the second week curb plate by the roof, has strengthened holistic structural strength, effectually reduced resonance and the noise of battery package upper cover, and roof, second week curb plate and each island pass through metal body punching press or plastics and mould plastics and form an organic whole, and structural strength is high, and manufacturing process is simple.

The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention, without limitation to the invention. It is evident that the drawings in the following description are only examples, from which other drawings can be obtained by a person skilled in the art without the inventive effort. In the drawings:

fig. 1 is a schematic view of an external structure of a battery pack according to an embodiment of the present disclosure;

fig. 2 is a schematic view of a structure of a battery pack with an upper cover removed according to an embodiment of the present disclosure;

fig. 3 is a schematic structural view of a main case of a battery pack according to an embodiment of the present application;

fig. 4 is a schematic structural view of a pressing member of a battery pack according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a battery cell of the battery pack according to the embodiment of the present application;

fig. 6 is a schematic structural view of a battery assembly of a battery pack according to an embodiment of the present disclosure;

fig. 7 is a first view of a battery pack according to an embodiment of the present disclosure between two adjacent battery cells;

fig. 8 is a second view of a battery pack according to an embodiment of the present disclosure between two adjacent battery cells;

fig. 9 is a third view between two adjacent battery cells of a battery pack according to an embodiment of the present disclosure;

fig. 10 is a fourth view between two adjacent battery cells of a battery pack according to an embodiment of the present disclosure;

fig. 11 is a schematic structural view of a composite separator of a battery assembly of a battery pack according to an embodiment of the present application;

FIG. 12 is a graph of the amount of stress compression of materials used for the heat conductive and insulating components of the battery assembly of the battery pack provided by embodiments of the present application;

fig. 13 is a schematic structural view of a battery pack top cover according to an embodiment of the present disclosure;

fig. 14 is a schematic structural view of a top plate of a battery pack top cover according to an embodiment of the present disclosure;

fig. 15 is a first schematic structural view of a second peripheral side plate of the battery pack top cover according to the embodiment of the present application;

fig. 16 is a schematic view showing a second structure of a second peripheral side plate of the battery pack top cover according to the embodiment of the present application.

FIG. 17 is a cross-sectional view of the mating of the main housing, top cover and gasket of the battery pack provided in an embodiment of the present application;

fig. 18 is an enlarged view at a in fig. 17;

fig. 19 is a schematic structural view of an upper cover of a battery pack provided in an embodiment of the present application disposed on a main case;

fig. 20 is a schematic structural diagram of the upper cover and the sealing ring of the upper cover of the battery pack according to the embodiment of the present application;

fig. 21 is an enlarged view at B in fig. 20.

In the figure, a main case 1, a reinforcing case 11, a bonding plate 111, a through hole 1111, a protector 12, a baffle 121, a connection plate 122, a connection hole 13, a first peripheral side plate 14, a first annular side plate 141, a bottom plate 15, a battery core 2, an upper end surface 21, a tab 211, a relief valve 212, a bottom wall 22, a peripheral side wall 23, a main wall 231, a thickness wall 232, a pressing member 3, a main body 31, an upper pressure strip 311, a side pressure strip 312, a ventilation hole 3121, a flange 313, a fixing arm 32, a first connection hole 321, a signal acquisition cable 4, an upper cover 5, a top plate 51, a second peripheral side plate 52, an annular main plate 521, a second annular end surface 5211, a limit part 5211a, an annular sub-plate 522, an annular groove 523, a first island 53, a main island 531, an extended island 532, a first extended island 5321, a second extended island 5321, a pit 54, a main pit 541, a narrow strip pit 542, a second island 55, a third island 56, a second connection hole 57, a cooling plate 6, a cooling medium channel 61, a composite cooling medium channel 71, a heat-insulating member 72, and a sealing ring member 8 are illustrated.

It should be noted that these drawings and the written description are not intended to limit the scope of the inventive concept in any way, but to illustrate the inventive concept to those skilled in the art by referring to the specific embodiments.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention, and the following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Example 1

Referring to fig. 13 to 16, a first embodiment of the present application provides a battery pack top cover, including: the top plate 51, the second peripheral side plate 52 connected to the peripheral side edge of the top plate 51, and a plurality of islands distributed on the outer surface of the top plate 51 and/or the second peripheral side plate 52, wherein the parts of the inner surfaces of the top plate 51 and the second peripheral side plate 52 corresponding to the islands are concave parts. At least a portion of the islands extend from the top plate 51 to the second peripheral side plate 52, and at least the islands extending to the second peripheral side plate 52 are provided at the respective corners of the top plate 51. The top plate 51, the second peripheral side plate 52 and the islands are formed by punching a metal body, or the top plate 51, the second peripheral side plate 52 and the islands are plastic members formed by injection molding. The top plate 51, the second peripheral side plate 52 and each island may be made of plastic metal, and are formed by stamping a metal body in one step, and the stamping process of the metal body is simple, and the overall structural strength is high. The top plate 51, the second peripheral side plate 52 and each island can also be made of plastic materials, the cost of the plastic materials is low, the plastic parts are formed by one-time injection molding through an injection molding process, the injection molding process is simple, and the overall structural strength is high. The battery package upper cover protrusion of this application sets up a plurality of islands, and at least some islands extend to second week curb plate 52 by roof 51, have strengthened holistic structural strength, effectually reduced resonance and the noise of battery package upper cover, and roof 51, second week curb plate 52 and each island pass through metal body punching press or plastics and mould plastics and form an organic whole, and structural strength is high, and manufacturing process is simple.

It was monitored that the natural resonant frequency of the battery pack cover was 15hz when the islands were not provided with protrusions, and was raised to 30hz after the islands were provided. The battery pack upper cover is provided with the islands in a protruding mode, so that the natural frequency of the battery pack upper cover can be effectively reduced, and the resonance risk of the battery pack upper cover is reduced while the structural strength of the whole upper cover is improved.

The side lines of each island comprise an arc line and/or a broken line. Each island is irregularly shaped, so that the natural frequency of the island can be effectively reduced, and the resonance risk of the upper cover of the battery pack is reduced.

The battery pack cover includes a first island 53, and the first island 53 includes a main island 531 and a plurality of extended islands 532. The main islands 531 are located on the outer surface of the top plate 51, the main islands 531 are in a closed ring shape, and the main islands 531 are located near the edge of the top plate 51. Each of the extended islands 532 is disposed at intervals in the circumferential direction of the main island 531, and a uniform end of each of the extended islands 532 is connected to the main island 531, and the other end extends to the edge of the top plate 51 or to the second peripheral side plate 52. The uniform ends of the extended islands 532 are connected to the main islands 531, and the other ends thereof extend to the edge of the top plate 51 or to the second peripheral side plate 52. In this way, the peripheral edges of the main islands 531 are all extended to the second peripheral side plate 52 through the extending islands 532, and the whole top plate 51 and the second peripheral side plate 52 are integrally joined and reinforced by the extending islands 532, so that the structural strength is high.

The top plate 51 is located inside the main islands 531 to form pits 54, and the pits 54 are located at a central position of the top plate 51. The middle part of the top plate 51 is concave, and the part of the top plate 51 close to the edge is convex, so that the structure of concave-convex matching increases the structural strength of the top plate 51, and the top plate 51 is not easy to deform.

A plurality of second islands 55 are disposed in the pit 54, each second island 55 is distributed at a different position of the pit 54, and the area of each second island 55 is smaller than that of the first island 53. The larger the area of the islands, the higher the structural strength, and the weaker the structural strength of the edges and corners of the top plate 51, and the more likely the deformation will occur, so the larger the area of the first islands 53, and the smaller the area of the second islands 55, than the first islands 53.

In one possible embodiment, the pit 54 includes a main pit 541 and a narrow stripe pit 542 extending from the main pit 541 toward the edge of the top plate 51. The top plate 51 has a small structural strength at the edge, a large area of islands is arranged, narrow strip pits 542 are arranged between the islands, a large structural strength in the middle part is arranged, the area of islands is small, and the area of the main pit 541 is large.

The width of at least a portion of the extended islands 532 is gradually reduced in the direction from the main islands 531 to the second peripheral side plates 52. The island structure with the wide root and the narrow end meets the mechanical design principle and has high structural strength.

Each of the extended islands 532 includes four first extended islands 5321532 and a plurality of second extended islands 5321532, and a plurality of second extended islands 5321532 are disposed between adjacent first extended islands 5321532, and each of the second extended islands 5321532 extends to an edge of the top plate 51 or to the second peripheral side plate 52, respectively. Each of the first extending islands 5321532 extends to a corresponding corner on the top plate 51 and two second peripheral side plates 52 on both sides of the corner. The structural strength of each corner is increased.

The width of the first extended islands 5321532 is greater than the width of the second extended islands 5321532. Each corner has small structural strength and is easy to deform, the width of the first extending island 5321532 is larger than that of the second extending island 5321532, the area covered by the first extending island 5321532 is more, the structural strength of each corner is increased, and the four corners are reinforced and are not easy to deform.

In one possible embodiment, the battery pack cover includes a plurality of independent third islands 56, the third islands 56 extending from the second peripheral side plate 52 to the top plate 51, the third islands 56 being located on the second peripheral side plate 52 in an area larger than that on the top plate 51. The third islands 56 increase the structural strength of the second peripheral side panel 52 and extend partially to the top panel 51, strengthening the junction between the top panel 51 and the second peripheral side panel 52, and increasing the strength of the junction between the top panel 51 and the second peripheral side panel 52.

The upper surface of each island is a flat plane. The flat surface has good structural strength. The flat surface is conveniently manufactured by using a metal body stamping process or an injection molding process.

Example two

Referring to fig. 1 to 21, the embodiment of the present application also provides a battery pack, including the battery pack upper cover described above. The battery pack is provided with a main shell 1, a plurality of battery cells 2, a pressing piece 3 and a battery pack upper cover 5. The main casing 1 has a cavity and an upper opening communicating with the cavity, and each of the battery cells 2 is fitted into the cavity through the upper opening. The pressing piece 3 is located at one side of the upper opening, the pressing pieces 3 are sequentially arranged along the arrangement direction of the battery cells 2, two ends of each pressing piece 3 are respectively connected to the inner wall of the main casing 1, each battery cell 2 is pressed and fixed at one side of the upper opening by the pressing piece 3, the upper cover 5 is connected to the main casing 1, and the upper cover 5 seals the upper opening. The battery cells 2 do not pass through the form of the module, and each battery cell 2 is directly arranged in the main shell 1 through the upper opening, so that the component cost and the labor hour cost of the module group are saved. And compress tightly through compressing tightly piece 3 and fix each electric core 2 in upper shed one side to increase the frictional force between the electric core 2, compressing tightly piece 3 has restricted the displacement of each electric core 2 along the direction of height, has saved the process of extrusion. The battery pack is simple in structure, low in production cost and suitable for power supply with low power requirements.

As shown in fig. 2 and 3, the main casing 1 is internally provided with a protecting piece 12, the protecting piece 12 is located between the battery cell 2 and the inner wall of the main casing 1, a protecting cavity is formed between the protecting piece 12 and the inner wall of the main casing 1, and one end of a fastener sequentially penetrates through the upper cover 5 and the main casing 1 to extend into the protecting cavity. The fastener can be a screw, and the body of the screw runs through in proper order upper cover 5 with main casing 1, the cap body limit is located the lid deviates from the one side in protection chamber.

As shown in fig. 2 and 3, the protection member 12 includes a baffle 121 and a connection plate 122, the baffle 121 and the inner wall of the main casing 1 are disposed at intervals, the connection plate 122 is respectively connected with the baffle 121 and the main casing 1, a protection cavity is formed between the baffle 121, the connection plate 122 and the inner wall of the main casing 1, a connection hole 13 for communicating the protection cavity is formed in the main casing 1, and a fastener extends into the protection cavity through the connection hole 13. The upper cover 5 is provided with a second connecting hole 57, the rod body of the fastener sequentially penetrates through the second connecting hole 57 and the connecting hole 13, the end part of the rod body is positioned in the protection cavity, the fastener cannot touch the battery cell 2 in the main shell 1 due to the limitation of the baffle 121, and the fastener cannot puncture the battery cell 2, so that the function of protecting the battery cell 2 is achieved.

As shown in fig. 2 and 3, the main casing 1 is provided with a plurality of protection pieces 12, each protection piece 12 is sequentially disposed at intervals along an opening edge of the main casing 1, and corresponding connection holes 13 are respectively disposed on the main casing 1 corresponding to each protection piece 12. The protection piece 12 is arranged on the periphery of the main shell 1, so that the battery cells 2 are protected in an omnibearing manner.

In one possible embodiment, as shown in fig. 2 and 3, a plurality of reinforcing shells 11 are disposed on the inner wall of the main shell 1, the reinforcing shells 11 have a flat attaching plate 111, through holes 1111 are disposed on the attaching plate 111, the through holes 1111 reduce the weight of the attaching plate 111, so that the battery pack is lighter in weight, and the through holes 1111 are beneficial to heat dissipation of the battery cells 2, so that the heat dissipation effect is good. The attaching plate 111 is attached to the outer surface of the battery cell 2 in a state where the battery cell 2 is mounted in the cavity. The lamination plate 111 presses the battery cells 2, so that the arrangement stability of each battery cell 2 is good.

As shown in fig. 3, the main casing 1 includes a bottom plate 15 and four first peripheral side plates 14. Four first week curb plates 14 are connected respectively in bottom plate 15, and each first week curb plate 14 sets gradually along the week of bottom plate 15, and two adjacent first week curb plates 14 are connected perpendicularly, and four first week curb plates 14 enclose and close and form the cavity. The inner wall surface of each first peripheral side plate 14 is provided with a plurality of reinforcing shells 11, and each reinforcing shell 11 on each first peripheral side plate 14 is sequentially arranged at intervals along the direction perpendicular to the bottom plate 15. The reinforcing shell 11 has a bending edge connected with the attaching plate 111, the attaching plate 111 is parallel to the corresponding first peripheral side plate 14, and the bending edge is connected with the first peripheral side plate 14. Each of the reinforcement shells 11 increases the structural strength of the main shell 1, and each of the battery cells 2 is in indirect contact with the main shell 1, the reinforcement shells 11 protecting the main shell 1 from the extrusion of the battery cells 2.

In one possible embodiment, as shown in fig. 4, the pressing member 3 includes a main body 31 and two fixing arms 32, the main body 31 is pressed against each of the electric cells 2, the two fixing arms 32 are respectively disposed at two ends of the main body 31 along the length direction, the fixing arms 32 and the main body 31 have an included angle, and the two fixing arms 32 are respectively and fixedly connected to the bent edges of the reinforcing shells 11 on the two opposite first peripheral side plates 14. The main shell 1 is not provided with holes, the installation of the upper cover 5 of the module-free battery pack is not affected, and the sealing of the battery pack is facilitated. The ends of the two fixing arms 32 facing away from the main body 31 are provided with first connecting holes 321, and fasteners penetrate through the first connecting holes 321 to connect to the main casing 1, so as to fix the pressing member 3 on the bending edge of the reinforcing casing 11 in a connecting manner, so as to press each of the electric cores 2. The fastener may be a screw.

As shown in fig. 2 and 5, an end of the battery cell 2 facing away from the bottom plate 15 of the main casing 1 has an upper end surface 21, two tabs 211 are disposed on the upper end surface 21, and the two tabs 211 are respectively located at two sides of the upper end surface 21 along the thickness direction of the battery cell 2. The main body 31 is pressed against the upper end surface 21 of the battery cell 2, and the main body 31 is located between two tabs 211 of the battery cell 2. The main body 31 avoids the two tabs 211 on the battery cell 2, and does not affect the electrical connection between the tabs 211.

As shown in fig. 2 and 4, the main body 31 has an upper pressing bar 311 and two side pressing bars 312, the two side pressing bars 312 are separately disposed on two sides of the upper pressing bar 311 along the width direction, the side pressing bars 312 and the upper pressing bar 311 have an included angle, which may be 90 degrees, so that the upper pressing bar 311 and the side pressing bars 312 are vertically connected. The two side pressure strips 312 are pressed on the upper end face 21 of the battery cell 2, the pressing piece 3 forms a frame structure, the structural strength is higher, and the stability is better. The upper molding 311 is connected to the fixed arm 32.

As shown in fig. 2 and 4, a flange 313 is disposed at an end of the side pressure bar 312 facing away from the upper pressure bar 311, and the flange 313 is attached to the upper end surface 21. The structure of the flange 313 makes the structural stability of the pressing member 3 better, and the lower surface of the flange 313 is attached to the upper end surface 21, so that the surface-to-surface attachment makes the structural stability of the pressing member 3 pressing each of the battery cells 2 better.

In one possible embodiment, as shown in fig. 2 and 5, the cell 2 has a pressure release valve 212, the pressure release valve 212 is disposed on an upper end surface 21 of the cell 2, and two side pressure bars 312 are respectively located on two sides of the pressure release valve 212. The pressure release valve 212 is arranged at the middle position of the upper end face 21 of the battery cell 2, when the battery cell 2 is charged and discharged, the internal material reaction can enable the battery cell 2 to expand, and the battery cell 2 is subjected to air exhaust and pressure release through the pressure release valve 212 so as to reduce the pressure in the battery cell 2 and prevent the battery cell 2 from expanding and cracking due to large internal pressure.

A cavity is formed between the side pressure strip 312 and the upper pressure strip 311, so that a gap is formed between the upper pressure strip 311 and the upper end face 21 of the battery cell 2, and the upper pressure strip 311 does not affect the pressure release and the exhaust of the pressure release valve 212. The side pressure strip 312 and/or the upper pressure strip 311 are provided with ventilation holes 3121 communicated with the cavity. The gas discharged by the exhaust of the battery cell 2 will pass through the cavity and then be discharged through the air holes 3121, so that the pressure and the exhaust of the battery cell 2 are not affected.

As shown in fig. 2, the battery pack includes a signal acquisition cable 4, and the signal acquisition cable is connected in series with the tabs 211 of each of the electric cells 2, and is used for measuring the voltage signal of each of the electric cells 2. The signal acquisition cable 4 extends along the upper pressing bar 311, and only the air holes 3121 are provided on the side pressing bar 312. The upper pressing strip 311 is not provided with the ventilation holes 3121, and the pressure release and the exhaust from the ventilation holes 3121 do not affect the wiring of the signal acquisition cable 4.

As shown in fig. 6 to 12, the battery pack further includes a battery assembly including a cooling plate 6, a plurality of battery cells 2, and a heat conductive member 71. The cooling plate 6 has a cooling medium channel 61. Each of the battery cells 2 is supported by the cooling plate 6, and the battery cells 2 extend in a direction perpendicular to the cooling plate 6. The heat conductive members 71 are disposed in contact with the cooling plate 6 and the battery cells 2, respectively. The heat conduction member 71 is supported by the cooling plate 6, the heat conduction member 71 extends in a direction perpendicular to the cooling plate 6, and the heat conduction member 71 is bonded to the battery cell 2. The heat conduction component 71 of the battery assembly is attached to the battery cell 2 and extends along the height direction of the battery cell 2, the heat conduction area is increased, the heat conduction component 71 can conduct the temperature of the cooling plate 6 to the heat conduction component 71, the heat transfer efficiency is increased, the temperature difference gradient of the battery cell 2 along the height direction is reduced, the heat conduction coefficient is high, the battery cell 2 can be cooled rapidly, and the service life and the available capacity of the battery cell 2 are prolonged.

The battery cells 2 are arranged at intervals, and gaps are reserved among the battery cells 2. The heat conducting component 71 is in a sheet shape, the sheet-shaped body is conveniently attached to the battery cell 2, the heat conducting component 71 is positioned in the gap, the thickness end face of the heat conducting component 71 is attached to the cooling plate 6, and the surface of the heat conducting component 71 perpendicular to the thickness direction is attached to the battery cell 2. The bonding area is large, and the heat conduction effect is good.

The battery cell 2 has a bottom wall 22 and a peripheral side wall 23 disposed around the bottom wall 22, the bottom wall 22 is attached to the cooling plate 6, and the heat conductive member 71 is attached to at least a part of the peripheral side wall 23 of the battery cell 2. The area of the peripheral side wall 23 is large, the heat conduction area is increased, and the radiating effect is better.

The peripheral wall 23 includes two main walls 231 arranged in parallel at a distance from each other and a thickness wall 232 connecting the two main walls 231, and the heat conductive member 71 is attached to at least the main walls 231. The main wall 231 has a large area, increases the heat conduction area, and has a better heat dissipation effect.

The thermally conductive member comprises a graphite sheet. The heat conducting piece can be a graphite sheet, and when the thickness of the graphite sheet is 2mm, the heat conducting coefficient 800 is w/(m.k), the heat conductivity is good, and the heat conducting speed is high.

The battery assembly further comprises a heat insulating member 72, the heat insulating member 72 being disposed in the gap, adjacent cells 2 being separated by the heat insulating member 72. The heat insulation member 72 is directly attached to the battery cell 2, and the heat dissipation effect is good in a direct attaching mode. Alternatively, the heat insulating member 72 may be spaced apart from the battery cell 2. When a certain cell 2 is out of control, the heat insulation component 72 can also play a role of heat insulation, so that potential safety hazards caused by heat diffusion are prevented.

The heat insulating member 72 is in a sheet shape, heat conducting members 71 are respectively arranged on two sides of the heat insulating member 72 in the thickness direction, and the heat conducting members 71 on two sides of the heat insulating member 72 are respectively attached to different electric cores 2. Thus, the heat insulation member 72 and the heat conduction member 71 are conveniently arranged, each cell 2 not only can uniformly transfer heat on the cell 2 along the height direction through the heat conduction member 71, but also adjacent cells 2 are separated through the heat insulation member 72, and when a certain cell 2 is out of control, the heat insulation member 72 can also play a role in heat insulation.

The thickness end face of the heat insulating member 72 is supported by the cooling plate 6. The battery assembly may include a heat-conducting pad, the heat-conducting pad is laid on the cooling plate 6, the thickness end face of the heat-conducting component 71 and the thickness end face of the heat-insulating component 72 on the composite separator 7 are located in the same plane, and the thickness end face of the heat-conducting component 71 and the thickness end face of the heat-insulating component 72 are both attached to the heat-conducting pad. The heat conducting pads are connected with the heat conducting components 71 so as to quickly transfer the heat to the heat conducting pads, and fully exchange heat with the cooling plate 6, so that the effect of quickly cooling the battery cells is achieved. The heat conduction pad has the effect of heat conduction is fast, the heat conduction pad is a component commonly used in the field of battery packs, and is not the invention point of the application, and the principle of the application is not repeated.

The insulating member 72 comprises a aerogel sheet. The heat insulating member 72 may be a gel sheet, and the gel sheet has a thermal conductivity of 0.05 w/(m.k) at a thickness of 2mm, and has a good heat insulating effect.

The heat insulating member 72 and the heat conducting member 71 are bonded to each other. The heat conducting member 71 and the heat insulating member 72 are connected to form a composite separator 7, and each of the cells 2 and each of the composite separators 7 are alternately arranged in order along a straight line. The heat conducting member 71 and the heat insulating member 72 are both sheet-shaped, and may be bonded or otherwise attached to each other to form the composite separator 7, where the composite separator 7 may be cut according to a desired size, and then separately disposed between two adjacent electric cores 2, so that the installation process is simpler.

Each of the cells 2 is pressed and fixed during the grouping process, the heat conducting member and the heat insulating member 72 are also pressed correspondingly, and under the normal module pressing force, the deformation of the materials of the heat conducting member and the heat insulating member 72 is extremely small, and the stress and the compression thereof need to satisfy the curve relationship as shown in fig. 12, so that the heat conducting member and the heat insulating member 72 are not damaged. However, when the cell 2 expands, the heat conductive member and the heat insulating member 72 are pressed to be more than a critical value, the compression amount is rapidly increased with the increase of stress, and the heat conductive member and the heat insulating member 72 are deformed, so that the expansion space of the cell 2 can be absorbed, and the generation of a huge expansion force by the module is prevented.

As shown in fig. 17 to 21, the battery pack further includes a sealing ring 8, the main case 1 includes a bottom plate 15 and a first peripheral side plate 14 disposed at a periphery of a rim of the bottom plate 15, and the first peripheral side plate 14 is perpendicular to the bottom plate 15. The upper cover 5 comprises a top plate 51 and a second peripheral side plate 52 arranged on the periphery of the top plate 51, and the second peripheral side plate 52 is perpendicular to the top plate 51. In a state where the upper cover 5 and the main casing 1 are connected, the first peripheral side plate 14 and the second peripheral side plate 52 are sequentially arranged in the thickness direction of the first peripheral side plate 14, and the seal ring 8 is disposed between the first peripheral side plate 14 and the second peripheral side plate 52 and closes a gap between the first peripheral side plate 14 and the second peripheral side plate 52. The sealing ring 8 is small in size, sealing failure is not caused by deformation of upper and lower contact surfaces in a radial extrusion mode, the sealing effect is increased along with the increase of internal and external pressure differences, the pressure of the sealing surface is increased along with the increase of internal and external pressure differences, the sealing effect is ensured to be met under larger pressure differences, and the sealing effect is good.

As shown in fig. 17 and 18, the end of the first peripheral side plate 14 facing away from the bottom plate 15 is provided with a first annular end surface 141. The second peripheral side plate 52 includes an annular main plate 521 and an annular sub plate 522, the annular main plate 521 is connected to the top plate 51, and a second annular end surface 5211 is disposed at an end of the annular main plate 521 facing away from the top plate 51. The annular auxiliary plate 522 has a smaller thickness than the annular main plate 521, and the annular auxiliary plate 522 is connected to the inner side surface of the second annular end surface 5211. In the state that the main casing 1 and the upper cover 5 are connected, the first annular end surface 141 is attached to the second annular end surface 5211, the first peripheral side plate 14 and the annular auxiliary plate 522 are sequentially arranged along the thickness direction of the first peripheral side plate 14, and the sealing ring 8 is disposed between the first peripheral side plate 14 and the annular auxiliary plate 522 to seal a gap between the first peripheral side plate 14 and the annular auxiliary plate 522. The sealing ring 8 is not in failure in sealing due to deformation of the upper contact surface and the lower contact surface in a radial extrusion mode.

As shown in fig. 17 and 18, in a state where the main casing 1 and the upper cover 5 are connected, the seal ring 8 also closes the gap between the first annular end face 141 and the second annular end face 5211. In this way, the sealing roll also has a sealing effect in a direction perpendicular to the first annular end surface 141 and the second annular end surface 5211, and the sealing effect of double insurance is better in sealing performance.

The sealing ring 8 is disposed at an included angle between the second annular end surface 5211 and the outer side surface of the annular sub-plate 522. The included angle between the second annular end surface 5211 and the outer side surface of the annular auxiliary plate 522 can achieve sealing effects in both radial and axial directions.

In one possible embodiment, as shown in fig. 18, an annular groove 523 is provided on the second peripheral side plate 52, the annular groove 523 is located at least on the annular sub-plate 522, and the seal ring 8 is limited to the annular groove 523. The sealing ring 8 is conveniently fixed to the annular groove 523 in a partially limited manner, so that the sealing ring 8 is fixed and cannot easily shift.

The annular groove 523 is partially located on the outer side surface of the annular sub-plate 522 and partially located on the second annular end surface 5211. The seal ring 8 is partially embedded in the annular groove 523, and partially extends out of the annular groove 523. Thus, the sealing rings 8 are distributed in the radial direction and the axial direction, and the bidirectional sealing effect is achieved.

As shown in fig. 18, the first annular end surface 141 and the inner side surface of the first peripheral side plate 14 are smoothly transited by an arc surface. The cambered surface is smooth, no sharp angle exists, the sealing ring 8 is not scratched, and the sealing ring 8 is convenient to limit and cooperate. If the transition is right angle, the direct corner is sharp and easy to crush the sealing ring 8, so that the service life of the sealing ring 8 is affected.

As shown in fig. 20 and 21, a limiting portion 5211a is disposed on a side of the second annular end face 5211 away from the annular auxiliary plate 522, and the limiting portion 5211a is limited on a side of the sealing ring 8 away from the annular auxiliary plate 522. When the limit part 5211a prevents the sealing ring 8 from being seriously deformed, the sealing ring 8 is too much extruded, part of the sealing ring 8 moves to a too large position, even part of the sealing ring 8 moves out of the gap, the sealing effect is affected, and the proper compression amount of the sealing ring 8 is ensured.

In one possible embodiment, the limiting portion 5211a is provided on a partial end surface section of the second annular end surface 5211. The limiting portion 5211a is disposed to extend along a longitudinal direction of the second annular end surface 5211. The length direction is provided to ensure that the limit length of the limit part 5211a is longer, and the sealing ring 8 is ensured not to shift.

As shown in fig. 21, the limiting portion 5211a is provided with a smooth arc surface toward one side of the seal ring 8. The cambered surface can not scratch the sealing ring 8, if the transition is right-angle, the direct corner is sharp and easy to crush the sealing ring 8, so that the service life of the sealing ring 8 is influenced.

The main shell 1 and the upper cover 5 can be made of plastic materials, the cost of the plastic materials is low, the sealing ring 8 can be integrally formed with the upper cover 5 or the main shell 1, and the sealing ring can also be independently installed at a later stage.

The foregoing description is only illustrative of the preferred embodiment of the present invention, and is not to be construed as limiting the invention, but is to be construed as limiting the invention to any simple modification, equivalent variation and variation of the above embodiments according to the technical matter of the present invention without departing from the scope of the invention.

Claims (10)

1. A battery pack cover, comprising: the device comprises a top plate, a second peripheral side plate connected to the peripheral side edge of the top plate and a plurality of islands distributed on the outer surface of the top plate and/or the second peripheral side plate, wherein the parts of the inner surfaces of the top plate and the second peripheral side plate corresponding to the islands are concave parts;

at least a portion of the islands extend from the top plate to the second peripheral side plate, and at least the islands extending to the second peripheral side plate are provided at each corner of the top plate;

the top plate, the second peripheral side plate and the islands are formed by stamping a metal body, or the top plate, the second peripheral side plate and the islands are plastic pieces formed by injection molding.

2. The battery pack cover of claim 1, wherein the border of each island comprises an arc and/or fold line.

3. The battery pack cover of claim 1, comprising a first island comprising a main island and a plurality of extended islands;

the main islands are positioned on the outer surface of the top plate, are closed annular, and are arranged close to the edges of the top plate;

each extending island is sequentially arranged at intervals along the circumferential direction of the main island, the uniform end of each extending island is connected with the main island, and the other end of each extending island extends to the edge of the top plate or extends to the second peripheral side plate.

4. The battery pack cover of claim 3, wherein the top plate is located inside the main island to form a pit, and the pit is located at a middle position of the top plate.

5. The battery pack cover according to claim 4, wherein a plurality of second islands are provided in the recess, each second island being distributed at a different position of the recess;

each of the second islands has a smaller area than the first islands.

6. The battery pack top cover of claim 4 wherein the depressions comprise a main depression and a narrow stripe depression extending from the main depression to the top plate rim.

7. The battery pack cover as claimed in claim 2, wherein the width of at least part of the extended islands gradually decreases in a direction from the main islands to the second peripheral side plate.

8. The battery pack cover according to claim 3, wherein each of the extended islands comprises four first extended islands and a plurality of second extended islands, the plurality of second extended islands being disposed between adjacent first extended islands, each of the second extended islands extending to an edge of the top plate or to the second peripheral side plate, respectively;

each first extending island extends to a corresponding corner on the top plate and two second peripheral side plates at two sides of the corner.

9. The battery pack cover of any one of claims 1-8, comprising a plurality of independent third islands;

the third island extends from the second perimeter side panel to the top panel;

the third islands have a larger area on the second peripheral side panel than on the top panel.

10. A battery pack comprising a battery pack cover according to any one of claims 1 to 9.