Battery pack and electric equipment

Abstract

The utility model relates to the technical field of power batteries, and discloses a battery pack and electric equipment, the battery pack comprises a box body which is enclosed to form an accommodating space, and the box body is provided with a hollow first exhaust channel; the battery modules are arranged in the accommodating space, cold plate structures are correspondingly arranged on the upper side surface and the lower side surface of each layer of battery module, and a plurality of battery cells of each layer of battery module are transversely arranged to form a battery row; the cross beam is arranged in the accommodating space, the cross beam is provided with a hollow second exhaust channel and is communicated with the first explosion-proof valves of the plurality of battery cells in the battery row, and the second exhaust channel is communicated with the first exhaust channel. According to the utility model, the cold plate structures are correspondingly arranged on the upper side surface and the lower side surface of each layer of battery module, so that heat among the multiple layers of battery modules can be quickly cooled; and the first exhaust channel is communicated with the second exhaust channel, so that gas in the battery can be quickly exhausted outwards, and the safety performance of the battery pack is improved.

Description

Technical Field

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

[0002] Power batteries are the power source for tools, and they mainly serve electric vehicles, electric trains, electric bicycles and other transportation tools. With the rapid growth of the hybrid vehicle market, especially in plug-in hybrid electric (PHEV) models, the demand for hybrid battery packs is also increasing.

[0003] In the prior art, hybrid battery packs are mostly arranged in a multi-layer structure. However, the cooling capacity of such battery packs is poor. When the multi-layer battery cell structure is discharged, heat is easily accumulated between the multi-layer battery cells, thereby affecting the safety performance of the battery pack. Utility Model Content

[0004] In view of this, the utility model provides a battery pack and an electrical device to solve the problem that the battery pack has poor cooling capacity and heat is easily accumulated, thereby affecting the safety performance of the battery pack.

[0005] In the first aspect, the utility model provides a battery pack, comprising: a box body, which is enclosed to form a accommodating space, and the box body has a first hollow exhaust channel; a battery module, which is arranged in the accommodating space, and the battery module is arranged in a plurality of layers in the vertical direction, and the upper side and the lower side of each layer of the battery module are correspondingly provided with a cold plate structure, and each layer of the battery module includes a plurality of battery cells, and the plurality of battery cells are arranged in the transverse direction to form a battery row, and at least one row of the battery rows is arranged in the longitudinal direction; a crossbeam, which is arranged in the accommodating space, and the crossbeam is arranged in the transverse direction corresponding to a row of the battery rows, and the crossbeam has a second hollow exhaust channel and is connected to the first explosion-proof valves of a plurality of the battery cells in the row of the battery rows, and the second exhaust channel is connected to the first exhaust channel.

[0006] Beneficial effects: By providing cold plate structures on the upper and lower sides of each layer of battery modules, the heat between the multiple layers of battery modules can be quickly cooled to ensure the safety performance of the battery pack; by connecting the first exhaust channel with the second exhaust channel, the gas inside the battery can be quickly discharged to the outside, thereby improving the safety performance of the battery pack.

[0007] In an optional embodiment, a plurality of cross beams are provided along the vertical direction, the plurality of cross beams are provided in one-to-one correspondence with the plurality of layers of battery modules, two adjacent cross beams are connected, a first through hole is provided on the cross beam, and the second exhaust channels of two adjacent cross beams are interconnected through the first through hole.

[0008] Beneficial effect: By setting a plurality of cross beams, the exhaust rate and exhaust capacity of the battery pack are further improved.

[0009] In an optional embodiment, the battery pack further includes a fastener, and two adjacent beams are connected in the vertical direction by the fastener.

[0010] In an optional embodiment, each layer of the battery modules includes a row of battery rows arranged along the longitudinal direction, and the cross beams are correspondingly arranged on one side or both sides of the battery rows along the longitudinal direction; or, each layer of the battery modules includes a plurality of rows of battery rows arranged along the longitudinal direction, and a plurality of cross beams are arranged, and the cross beams are correspondingly arranged on at least one side of each row of battery rows along the longitudinal direction.

[0011] Beneficial effect: By setting a plurality of cross beams, the exhaust rate and exhaust capacity of the battery pack are further improved.

[0012] In an optional embodiment, a second explosion-proof valve is provided on the box body, one end of the first exhaust channel is connected to the second exhaust channel, and the other end of the first exhaust channel is connected to the second explosion-proof valve.

[0013] Beneficial effect: By providing a second explosion-proof valve, the ability of the battery pack to exhaust gases outward is further improved, thereby improving the safety performance of the battery pack.

[0014] In an optional embodiment, the box body includes a main body, an upper cover and a lower cover, the main body is provided with openings at both ends, the upper cover and the lower cover are respectively provided corresponding to the openings at both ends and connected to the main body, the upper cover forms the cold plate structure on the upper side of the battery module located at the uppermost layer, and the lower cover includes the cold plate structure on the lower side of the battery module located at the lowermost layer.

[0015] Beneficial effect: The upper cover forms the cold plate structure on the upper side of the uppermost battery module, which is equivalent to the cold plate structure replacing the original upper shell structure, thus achieving a lightweight design.

[0016] In an optional embodiment, the lower cover includes a lower cold plate and a bottom guard plate, the lower cold plate is connected to the main body, the bottom guard plate is located below the lower cold plate and is spaced apart from the lower cold plate, the lower cold plate forms the cold plate structure located on the lower side of the battery module at the lower layer, the first exhaust channel includes a first sub-exhaust channel and a second sub-exhaust channel, the first sub-exhaust channel is formed between the lower cold plate and the bottom guard plate, the main body has a hollow structure to form the second sub-exhaust channel, one end of the first sub-exhaust channel is connected to the second exhaust channel, the other end of the first sub-exhaust channel is connected to one end of the second sub-exhaust channel, the other end of the second sub-exhaust channel is connected to the second explosion-proof valve, and the second explosion-proof valve is arranged on the main body.

[0017] Beneficial effects: By dividing the first exhaust channel between the structures, the coverage area of ​​the first exhaust channel is expanded, thereby improving the exhaust efficiency and exhaust capacity of the first exhaust channel; the lower cold plate and the bottom guard plate are integrated to reduce costs and achieve lightweight design.

[0018] In an optional embodiment, the lower cover includes a lower cold plate and a bottom protective plate, the lower cold plate is connected to the main body, the bottom protective plate is located below the lower cold plate and is spaced apart from the lower cold plate, the lower cold plate forms the cold plate structure located on the lower side of the battery module at the bottom, the first exhaust channel is formed between the lower cold plate and the bottom protective plate, and the second explosion-proof valve is arranged on the bottom protective plate.

[0019] In an optional embodiment, the battery pack further includes an intermediate cold plate, and the intermediate cold plate forms the cold plate structure between two adjacent layers of the battery modules.

[0020] In a second aspect, the utility model further provides an electrical device, comprising the above-mentioned battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a schematic diagram of the overall exploded structure of a battery pack according to an embodiment of the utility model (the first cold plate is not shown);

[0023] Figure 2A schematic diagram of an overall structural assembly of a battery pack according to an embodiment of the utility model (the first cold plate is not shown);

[0024] Figure 3 It is a structural schematic diagram of a battery module, a second cold plate and a cold plate assembly according to an embodiment of the utility model;

[0025] Figure 4 This is a schematic diagram of the structure of a battery module according to an embodiment of the utility model;

[0026] Figure 5 This is a schematic diagram of the structure of the crossbeam in an embodiment of the utility model;

[0027] Figure 6 This is a schematic diagram of the coordination of the double-layer crossbeams in an embodiment of the utility model;

[0028] Figure 7 This is a schematic diagram of a cross-sectional structure of a double-layer crossbeam according to an embodiment of the utility model;

[0029] Figure 8 This is another schematic diagram of the overall structural assembly of a battery pack according to an embodiment of the present invention (the first cold plate is not shown).

[0030] Description of reference numerals:

[0031] 10. Box body; 11. Main body; 13. Lower cover; 131. Lower cold plate; 132. Bottom guard plate; 20. Battery module; 21. Battery cell; 211. First explosion-proof valve; 30. Crossbeam; 31. First through hole; 32. Air vent; 40. Fastener; 50. Second explosion-proof valve; 60. Middle cold plate; 70. First sub-exhaust channel. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0033] Combine the following Figures 1 to 8 , describing an embodiment of the utility model.

[0034] According to an embodiment of the utility model, in the first aspect, a battery pack is provided, including a box body 10, a battery module 20 and a crossbeam 30. The box body 10 is enclosed to form a containing space, and the box body 10 has a first hollow exhaust channel; the battery module 20 is arranged in the containing space, and the battery module 20 is arranged in a plurality of layers in the vertical direction, and the upper side and the lower side of each layer of the battery module 20 are correspondingly provided with a cold plate structure, and each layer of the battery module 20 includes a plurality of battery cells 21, and the plurality of battery cells 21 are arranged in the horizontal direction to form a battery row, and at least one row of battery rows is arranged in the longitudinal direction; the crossbeam 30 is arranged in the containing space, and the crossbeam 30 is arranged in the horizontal direction corresponding to a row of battery rows, and the crossbeam 30 has a second hollow exhaust channel and is connected with the first explosion-proof valve 211 of a plurality of battery cells 21 in a row of battery rows, and the second exhaust channel is connected with the first exhaust channel.

[0035] The battery pack using this embodiment has cold plate structures correspondingly disposed on the upper and lower sides of each layer of battery modules 20 so as to quickly cool the heat between the multiple layers of battery modules 20 and ensure the safety performance of the battery pack; the first exhaust channel is connected to the second exhaust channel so that the gas inside the battery can be quickly discharged to the outside, thereby improving the safety performance of the battery pack.

[0036] In this embodiment, the battery cell 21 is a blade battery cell 21 , the battery module 20 is provided with two layers along the vertical direction, and the battery cell 21 is arranged in a double-layer flat arrangement.

[0037] Specifically, the gas in the battery cell 21 is discharged to the second exhaust channel in the beam 30 through the first explosion-proof valve 211 of the battery cell 21, then discharged from the second exhaust channel to the first exhaust channel, and finally discharged to the outside of the battery pack through the first exhaust channel.

[0038] In one embodiment, Figures 1 to 5 As shown, along the vertical direction, there are a plurality of cross beams 30, and the plurality of cross beams 30 are arranged one by one corresponding to the plurality of layers of battery modules 20, and two adjacent cross beams 30 are connected, and the cross beams 30 are provided with first through holes 31, and the second exhaust channels of the two adjacent cross beams 30 are connected to each other through the first through holes 31. By providing a plurality of cross beams 30, the exhaust rate and exhaust capacity of the battery pack are further improved.

[0039] For details, please refer to Figure 5 The crossbeam 30 is also provided with a plurality of air holes 32 , and the plurality of air holes 32 correspond to the explosion-proof valves of the plurality of battery cells 21 . The gas in the battery cells 21 enters the second exhaust channel of the crossbeam 30 through the air holes 32 .

[0040] Specifically, along the vertical direction, the gas is discharged from the upper beam 30 to the lower beam 30, see Figure 5 and Figure 6 A first through hole 31 is provided on the crossbeam 30 , and the first through hole 31 penetrates the crossbeam 30 . The first through hole 31 on the lower surface of the upper crossbeam 30 is correspondingly connected with the first through hole 31 on the upper surface of the lower crossbeam 30 , so as to facilitate the discharge and transfer of gas from top to bottom.

[0041] In one embodiment, Figures 6 to 8 As shown, the battery pack further includes a fastener 40 , and two adjacent beams 30 are connected in the vertical direction by the fastener 40 .

[0042] For details, please refer to Figures 6 to 8 The fastener 40 passes through the upper cross beam 30 and is fastened in the lower cross beam 30 to achieve the connection between the upper and lower cross beams 30 .

[0043] Specifically, the fastener 40 is a bolt and a nut. The rod of the fastener 40 passes through the upper beam 30 and the lower beam 30 through the first through hole 31 and is fastened to the lower beam 30 through the nut.

[0044] It should be noted that the rod diameter of the fastener 40 is smaller than the diameter of the first through hole 31, and the diameter of the bolt head and the diameter of the nut of the fastener 40 are larger than the diameter of the first through hole 31, so as to ensure the connection and exhaust function of the first through hole 31 on the basis of achieving the connection and fastening of the upper and lower layers of beams 30.

[0045] Of course, in other alternative embodiments, a separate mounting hole may be provided on the cross beam 30 to facilitate the penetration of the fastener 40 and prevent the fastener 40 from obstructing the gas exhaust flow.

[0046] It should be noted that the number of fasteners 40 can be selected according to actual conditions.

[0047] In one embodiment, Figures 1 to 4 As shown, each layer of battery module 20 includes several rows of battery rows arranged in the longitudinal direction, and several cross beams 30 are provided, and at least one side of each row of battery rows in the longitudinal direction is correspondingly provided with a cross beam 30. By providing several cross beams 30, the exhaust rate and exhaust capacity of the battery pack are further improved.

[0048] Specifically, two rows of battery rows are arranged in the longitudinal direction, and three cross beams 30 are arranged. The three cross beams 30 are respectively arranged on the left side of the first row of battery rows, on the right side of the second row of battery rows, and between the two rows of battery rows.

[0049] In other alternative embodiments, each layer of battery modules 20 includes a row of battery rows arranged along the longitudinal direction, and cross beams 30 are correspondingly arranged on one side or both sides of the battery rows along the longitudinal direction.

[0050] It should be noted that the first explosion-proof valve 211 of the battery cell 21 can be arranged on one side of the battery cell 21 or on both sides of the battery cell 21 in the longitudinal direction, so the crossbeam 30 can be arranged on one side or both sides of the battery cell 21 according to actual conditions.

[0051] In one embodiment, Figure 8 As shown, a second explosion-proof valve 50 is provided on the box body 10, one end of the first exhaust channel is connected to the second exhaust channel, and the other end of the first exhaust channel is connected to the second explosion-proof valve 50. By providing the second explosion-proof valve 50, the ability of the battery pack to exhaust gas to the outside is further improved, and the safety performance of the battery pack is improved.

[0052] It should be noted that a plurality of second explosion-proof valves 50 may be provided to enhance the exhaust capacity of the battery pack.

[0053] In one embodiment, Figure 1 and Figure 2 As shown, the box body 10 includes a main body 11, an upper cover and a lower cover 13. The main body 11 is provided with openings at both ends. The upper cover and the lower cover 13 are respectively provided corresponding to the openings at both ends and connected to the main body 11. The upper cover forms a cold plate structure on the upper side of the battery module 20 located at the uppermost layer, and the lower cover 13 includes a cold plate structure on the lower side of the battery module 20 located at the lowermost layer.

[0054] It should be noted that in the related art, a cold plate structure is often provided between the upper cover and the lower cover 13 on the basis of the upper cover. Therefore, the upper cover forms the cold plate structure on the upper side of the uppermost battery module 20, which is equivalent to the cold plate structure replacing the original upper shell structure, thus achieving a lightweight design.

[0055] It should be noted that the cold plate structure in the battery pack is bonded to one side of the battery cell 21 using a thermally conductive structural adhesive.

[0056] In one embodiment, Figure 8 As shown, the lower cover 13 includes a lower cold plate 131 and a bottom guard plate 132. The lower cold plate 131 is connected to the main body 11. The bottom guard plate 132 is located below the lower cold plate 131 and is spaced apart from the lower cold plate 131. The lower cold plate 131 forms a cold plate structure located on the lower side of the battery module 20 at the lowermost layer. A first exhaust channel is formed between the lower cold plate 131 and the bottom guard plate 132, and a second explosion-proof valve 50 is arranged on the bottom guard plate 132.

[0057] Specifically, after the gas enters between the lower cold plate 131 and the bottom protective plate 132 , it is directly discharged into the second explosion-proof valve 50 through the first exhaust channel and finally discharged from the battery pack.

[0058] In other alternative embodiments, the lower cover 13 includes a lower cold plate 131 and a bottom guard plate 132, the lower cold plate 131 is connected to the main body 11, the bottom guard plate 132 is located below the lower cold plate 131 and is spaced apart from the lower cold plate 131, the lower cold plate 131 forms a cold plate structure located on the lower side of the battery module 20 at the lowermost layer, the first exhaust channel includes a first sub-exhaust channel 70 and a second sub-exhaust channel, a first sub-exhaust channel 70 is formed between the lower cold plate 131 and the bottom guard plate 132, the main body 11 has a hollow structure to form a second sub-exhaust channel, one end of the first sub-exhaust channel 70 is connected to the second exhaust channel, the other end of the first sub-exhaust channel 70 is connected to one end of the second sub-exhaust channel, the other end of the second sub-exhaust channel is connected to the second explosion-proof valve 50, and the second explosion-proof valve 50 is arranged on the main body 11. The first exhaust channel is divided between the structures to expand the coverage area of ​​the first exhaust channel, thereby improving the exhaust efficiency and exhaust capacity of the first exhaust channel; the lower cold plate 131 and the bottom guard plate 132 are integrated to reduce costs and achieve lightweight design.

[0059] Specifically, the main body 11 includes an inner baffle and an outer baffle, the inner baffle is connected to the outer baffle, and a second sub-exhaust channel is formed between the inner baffle and the outer baffle.

[0060] Specifically, the gas is discharged from the second exhaust channel into the first sub-exhaust channel 70 between the lower cold plate 131 and the bottom protective plate 132, then discharged from the first sub-exhaust channel 70 into the second sub-exhaust channel, and finally discharged from the second sub-exhaust channel to the second explosion-proof valve 50 and discharged outside the battery pack.

[0061] In one embodiment, Figures 1 to 3 As shown, the battery pack further includes an intermediate cold plate 60 , which forms a cold plate structure between two adjacent layers of battery modules 20 .

[0062] Specifically, in this embodiment, the battery modules 20 are arranged in two layers in the vertical direction, and in each layer of the battery modules 20, two rows of batteries are arranged in the longitudinal direction.

[0063] Furthermore, for the battery module 20 of this embodiment, two layers of cross beams 30 are provided in the vertical direction, and three cross beams 30 are provided in the longitudinal direction on each layer; one intermediate cold plate 60 is provided, and the intermediate cold plate 60 is provided between the two layers of battery modules 20; six fasteners 40 are provided, and the fasteners 40 pass through the upper cross beam 30 and are fastened in the lower cross beam 30 to realize the connection between the upper and lower cross beams 30.

[0064] When the battery pack of this embodiment is used, the gas generated by the battery cell 21 is first discharged from the first explosion-proof valve 211 through the air hole 32 into the second exhaust channel of the beam 30; then, the gas is discharged and transferred from the upper beam 30 to the lower beam 30, and discharged from the second exhaust channel of the lowest beam 30 to the lower cold plate 131; the gas enters the upper plate of the lower cold plate 131, and then the gas is discharged to the first sub-exhaust channel 70 between the lower cold plate 131 and the bottom guard plate 132 through the lower plate of the lower cold plate 131; the gas is discharged to the second sub-exhaust channel in the main body 11 through the first sub-exhaust channel 70, and finally discharged to the outside of the battery pack by the second explosion-proof valve 50.

[0065] In a second aspect, the utility model further provides an electrical device, comprising the above-mentioned battery pack.

[0066] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery pack, characterized in that: include: A box body is enclosed to form a containing space, and the box body has a first exhaust passage arranged in a hollow manner; A battery module is arranged in the accommodation space, wherein the battery module is arranged in a plurality of layers in the vertical direction, and the upper side and the lower side of each layer of the battery module are respectively provided with a cold plate structure, and each layer of the battery module includes a plurality of battery cells, and the plurality of battery cells are arranged in a transverse direction to form a battery row, and at least one row of the battery row is arranged in a longitudinal direction; A crossbeam is arranged in the accommodating space, and the crossbeam is arranged corresponding to a row of the battery rows in the horizontal direction. The crossbeam has a hollow second exhaust channel and is connected to the first explosion-proof valves of several battery cells in the row of the battery rows, and the second exhaust channel is connected to the first exhaust channel.

2. The battery pack according to claim 1, characterized in that: Along the vertical direction, there are a plurality of cross beams, and the plurality of cross beams are arranged one-to-one corresponding to the plurality of layers of battery modules, and two adjacent cross beams are connected, and a first through hole is opened on the cross beam, and the second exhaust channels of the two adjacent cross beams are interconnected through the first through hole.

3. The battery pack according to claim 2, characterized in that: The battery pack further includes a fastener, and along the vertical direction, two adjacent beams are connected by the fastener.

4. The battery pack according to any one of claims 1 to 3, characterized in that: Each layer of the battery module comprises a row of the battery rows arranged in the longitudinal direction, and the cross beams are correspondingly arranged on one side or both sides of the battery row in the longitudinal direction; or, Each layer of the battery module includes a plurality of rows of battery rows arranged in the longitudinal direction, and a plurality of cross beams are provided. The cross beam is correspondingly arranged on at least one side of each row of battery rows in the longitudinal direction.

5. The battery pack according to any one of claims 1 to 3, characterized in that: The box body is provided with a second explosion-proof valve, one end of the first exhaust channel is communicated with the second exhaust channel, and the other end of the first exhaust channel is communicated with the second explosion-proof valve.

6. The battery pack according to claim 5, characterized in that: The box body includes a main body, an upper cover and a lower cover, the main body is provided with openings at both ends, the upper cover and the lower cover are respectively provided corresponding to the openings at both ends and connected to the main body, the upper cover forms the cold plate structure on the upper side of the battery module located at the uppermost layer, and the lower cover includes the cold plate structure on the lower side of the battery module located at the lowermost layer.

7. The battery pack according to claim 6, characterized in that: The lower cover includes a lower cold plate and a bottom guard plate, the lower cold plate is connected to the main body, the bottom guard plate is located below the lower cold plate and is spaced apart from the lower cold plate, the lower cold plate forms the cold plate structure located on the lower side of the battery module at the lowermost layer, the first exhaust channel includes a first sub-exhaust channel and a second sub-exhaust channel, the first sub-exhaust channel is formed between the lower cold plate and the bottom guard plate, the main body has a hollow structure to form the second sub-exhaust channel, one end of the first sub-exhaust channel is connected to the second exhaust channel, the other end of the first sub-exhaust channel is connected to one end of the second sub-exhaust channel, the other end of the second sub-exhaust channel is connected to the second explosion-proof valve, and the second explosion-proof valve is arranged on the main body.

8. The battery pack according to claim 6, characterized in that: The lower cover includes a lower cold plate and a bottom guard plate, the lower cold plate is connected to the main body, the bottom guard plate is located below the lower cold plate and is spaced apart from the lower cold plate, the lower cold plate forms the cold plate structure located on the lower side of the battery module at the lowermost layer, the first exhaust channel is formed between the lower cold plate and the bottom guard plate, and the second explosion-proof valve is arranged on the bottom guard plate.

9. The battery pack according to any one of claims 1 to 3, characterized in that: The battery pack further includes an intermediate cold plate, which forms the cold plate structure between two adjacent layers of the battery modules.

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

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