Battery pack

Abstract

The present invention relates to the technical field of batteries, and discloses a battery pack, which comprises: a battery box, which is circumferentially provided with a plurality of frame members, the plurality of frame members define an accommodating cavity, and any frame member is provided with a first support structure extending towards the accommodating cavity; at least part of the water cooling plate is erected on the first supporting structure extending to the containing cavity; the plurality of battery cells are arranged on the water cooling plate, and the first supporting structure supports the battery cells through the water cooling plate, so that the load of the battery cells is dispersed to the plurality of frame pieces through the first supporting structure. According to the invention, the water-cooling plate is erected on the at least one first supporting structure, the plurality of battery cells are arranged on the water-cooling plate, and the load of the plurality of battery cells on the water-cooling plate is dispersed to the plurality of frame pieces of the battery box through the first supporting structure, so that the load borne by the bottom plate of the battery box below the water-cooling plate is reduced; and stress is prevented from being concentrated on the joint of the bottom plate and the frame piece of the battery box, so that the connection stability of the bottom plate and the frame piece is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery pack. Background Art

[0002] Battery packs are widely used in various electric vehicles as energy storage devices. At present, battery packs include battery boxes and battery modules, and the battery modules are arranged in the battery box. The battery module is composed of multiple battery cells, end plates and steel belts. During assembly, multiple battery cells need to be stacked to form a battery cell group, and then two end plates are set on both sides of the battery cell group to clamp the battery cell group through the end plates, and then the two groups of battery cell groups and end plates are bundled and fixed with steel belts to form a battery module, and then the battery module is placed in the battery box to form a battery pack.

[0003] Currently common battery packs, such as Fig.18 As shown, the bottom of the battery box d1 will be fully covered with a plate d2, and the battery module will be supported by the profile plate d2. In the above-mentioned battery pack setting scheme, the load of the battery cell is completely applied to the water cooling plate of the battery box d1 through the profile plate. After the whole vehicle is assembled, the bottom plate of the battery box d1 needs to be subjected to the load of the battery cell for a long time, so that the stress is concentrated on the connection between the bottom plate of the battery box d1 and the frame of the battery box d1, which easily leads to an unstable connection between the bottom plate and the frame, thereby damaging the battery pack. Summary of the invention

[0004] In view of this, the present invention provides a battery pack to solve the problem that stress in the current battery pack is concentrated at the connection between the bottom plate of the battery box and the frame of the battery box, which easily leads to an unstable connection between the bottom plate and the frame.

[0005] The present invention provides a battery pack, comprising: a battery box, which is circumferentially provided with a plurality of frame members, the plurality of frame members together enclose a accommodating cavity, and any of the frame members is provided with a first supporting structure extending toward the accommodating cavity; a water-cooling plate, at least partially mounted on the first supporting structure extending to the accommodating cavity; a plurality of battery cells, which are arranged on the water-cooling plate, the first supporting structure supporting the battery cells through the water-cooling plate, so that the load of the battery cells is dispersed to the plurality of frame members through the first supporting structure.

[0006] Beneficial effect: The present invention provides a battery pack, wherein a plurality of first supporting structures are arranged on a plurality of frame members, a water cooling plate is mounted on at least one of the first supporting structures and a plurality of battery cells are arranged on the water cooling plate, and the loads of the plurality of battery cells on the water cooling plate are dispersed to the plurality of frame members of the battery box through the first supporting structure, thereby reducing the load on the bottom plate of the battery box under the water cooling plate, avoiding stress concentration at the connection between the bottom plate and the frame member of the battery box, and improving the connection stability between the bottom plate and the frame member.

[0007] In an optional embodiment, the frame member is extended toward the accommodating cavity to form a mounting portion, and the side edge of the water cooling plate is extended toward the mounting portion to form an extension portion, and the extension portion is overlapped on the mounting portion.

[0008] Beneficial effect: The mounting part is jointly supported by the extension part on the side of the water-cooling plate, and the load of the battery cells on the water-cooling plate is dispersed to the mounting part through the extension part of the water-cooling plate, and then the load is dispersed to the frame member.

[0009] In an optional embodiment, the first supporting structure is integrally formed with the mounting portion.

[0010] Beneficial effect: The first supporting structure is integrally formed with the mounting portion, so that the first supporting structure and the frame member are integrally formed, thereby improving the force transmission efficiency. It can also facilitate demolding when producing parts, thereby improving production efficiency.

[0011] In an optional embodiment, the frame member includes two first frame members arranged opposite to each other, and a second frame member connected between the two first frame members; the first supporting structure includes a first supporting member and a second supporting member, the two first supporting members are arranged in the same direction as the first frame members, the second supporting member is located between the two first supporting members, and the first supporting member and the second supporting member are jointly supported on the bottom of the water-cooling plate; the mounting portion includes a first mounting portion and a second mounting portion, the first mounting portion is formed by extending the first frame member toward the accommodating cavity, and the second mounting portion is formed by extending the second frame member toward the accommodating cavity; the first support member is integrally formed with the first mounting portion, and the second support member is integrally formed with the second mounting portion.

[0012] Beneficial effect: The first support member and the second support member are jointly supported on the bottom of the water-cooled plate, and the load of the battery cells on the water-cooled plate is dispersed to the first support member and the second support member through the bottom of the water-cooled plate, and then the load is dispersed to the first frame and the second frame.

[0013] In an optional embodiment, the battery pack further includes a second supporting structure, which is arranged in the accommodating cavity in the same direction as the first frame and connected to the first supporting structure; the first supporting structure and the second supporting structure jointly support the water cooling plate.

[0014] Beneficial effect: The first supporting structure and the second supporting structure jointly support the water cooling plate, further dispersing the load on the bottom plate of the battery box, thereby further improving the connection stability between the bottom plate and the frame member.

[0015] In an optional embodiment, the second support structure includes one or more third support members arranged in the same direction as the first frame; an air avoidance area is formed between two adjacent third support members, and / or an air avoidance area is formed between one third support member and one first support member; when the plurality of battery cells are arranged on the water cooling plate, they fall in the air avoidance area, so that the third support member and / or the first support member support the ends of the battery cells.

[0016] Beneficial effect: The third support member is used to support the ends of the two groups of battery cells that are close to each other, and the two first support members are used to support the ends of the two groups of battery cells that are far away from each other, thereby achieving a stable support effect on the battery module formed by multiple battery cells.

[0017] In an optional embodiment, the water cooling plate is formed with a plurality of flow channels, a recessed air avoidance portion is formed between two adjacent flow channels, at least a portion of the structure of the third support member corresponds to the air avoidance portion to form a protruding mating portion, and the mating portion is embedded in the air avoidance portion.

[0018] Beneficial effect: The matching portion formed on the third support member corresponds to the avoidance portion formed between the two flow channels of the water-cooling plate, so that the corresponding position of the third support member and the water-cooling plate are completely fitted, and the supporting force of the third support member on the battery cell can be completely transmitted to the battery cell arranged on the water-cooling plate through the water-cooling plate, thereby improving the stability of the third support member in supporting the battery cell.

[0019] In an optional embodiment, the plurality of battery cells are arranged side by side in two groups, and the second supporting structure includes a third supporting member; the third supporting member is arranged between the two groups of battery cells, and is suitable for supporting the ends of the two groups of battery cells that are close to each other, and the two first supporting members are suitable for respectively supporting the ends of the two groups of battery cells that are far away from each other.

[0020] Beneficial effect: A third support member disposed between two groups of battery cells and located in the middle can ensure the structural strength of the battery pack near the middle of the battery box bottom plate, so that the battery pack has sufficient structural strength to cope with the bottom scraping condition test.

[0021] In an optional embodiment, the frame member also includes: a third frame, close to the front of the battery box and connected between the two first frames, the third frame including two inclined portions respectively connected to the two first frames, and a straight portion connected between the two inclined portions; an expansion beam, at least one end of which is connected to a converter, the inclined portion is provided with a mounting groove suitable for embedding the converter, and when the converter is embedded in the mounting groove, the converter is perpendicular to the inclined portion.

[0022] Beneficial effect: The expansion beam is connected to the third frame by using an adapter. When the battery cell expands for some reason and squeezes the expansion beam, the force on the expansion beam acting on the inclined portion of the third frame will form two components of force parallel and perpendicular to the adapter, thereby reducing the size of the expansion force directly acting on the connection between the expansion beam and the third frame, reducing the impact of the expansion force on the connection between the expansion beam and the third frame, and ensuring the stability of the connection between the expansion beam and the third frame.

[0023] In an optional embodiment, the first frame, the second frame and the third frame together form a frame member of the battery box; the frame member includes a connecting portion horizontally arranged and suitable for connecting to a vehicle body, a frame portion forming a side wall of the battery box, and an extending portion extending toward the battery cell and suitable for connecting to the support member and / or the water cooling plate, and the connecting portion, the frame portion and the extending portion are divided into multiple chambers by multiple plate bodies.

[0024] Beneficial effects: The connecting part, frame part and extension part of the frame member are arranged in the form of multiple chamber partitions. When the battery pack is hit from the side, the interaction between the chambers is used to reduce the impact of the impact force on the internal battery cells, thereby effectively protecting the battery cells. The frame member with multiple chambers effectively reduces the overall weight of the frame member. After the extension part is connected to the support member and the water-cooling plate, the profile section of the frame member can transfer the lateral impact force to the support member and the water-cooling plate at the bottom of the battery cell, thereby reducing the probability of damage to the battery cell under abuse conditions.

[0025] In an optional embodiment, the connecting portion includes a horizontally arranged connecting plate; the frame portion includes a first main board and a second main board arranged vertically, and a first middle board and a second middle board connected between the first main board and the second main board, the first main board is connected to the connecting plate, and an angle θ1 between the first middle board and the first main board is 40°~45°, the second middle board is connected to the connection between the first middle board and the first main board, and an angle θ2 with the first main board is 58°~63°; the extending portion includes an extension plate connected to the second main board, and an angle θ3 between the extension plate and the second main board is 53°~58°; the ratio of a height L2 from the bottom of the extension plate to the bottom of the connecting portion to a height L1 of the connecting portion is 0.51~0.54.

[0026] Beneficial effect: The impact force of a lateral collision on the battery pack is transmitted to the first main board through the connecting plate of the connecting part, and the first intermediate plate and the second intermediate plate connected to the first main board decompose the impact force transmitted by the connecting plate in their own two directions, wherein the impact force of the first intermediate plate is transmitted to the lower part of the frame member, and the impact force of the second intermediate plate is transmitted to the relatively upper part of the frame member, and then transmitted to the lower part of the frame member through the extension plate of the extension part, thereby transmitting the impact force as a whole to the extension part, reducing the influence of the impact force on the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the present invention 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic diagram of the structure of a battery pack provided by the present invention;

[0029] Figure 2 An exploded diagram of a battery pack provided by the present invention;

[0030] Figure 3 A schematic diagram of the structure of the battery box and internal support provided by the present invention;

[0031] Figure 4 A top view of the internal structure of a battery pack provided by the present invention;

[0032] Figure 5 for Figure 4 Sectional view in the XX direction;

[0033] Figure 6 for Figure 5 A partial enlarged schematic diagram of point B in the middle;

[0034] Figure 7 for Fig.15 Partial cross-sectional view along the YY direction;

[0035] Figure 8 for Figure 7 A partial enlarged schematic diagram of point C in the middle;

[0036] Fig. 9 for Figure 5 A local enlarged schematic diagram of the middle A;

[0037] Fig.10 for Figure 7 A partial enlarged schematic diagram of point D in the middle;

[0038] Fig.11 for Figure 5 The third support member at A in the middle is a partially enlarged schematic diagram of a preferred embodiment;

[0039] Fig.12 A schematic structural diagram of a preferred embodiment of the third support member provided by the present invention;

[0040] Fig.13A schematic diagram of a first size specification of the third support member provided by the present invention;

[0041] Fig.14 A schematic diagram of a second size specification of the third support member provided by the present invention;

[0042] Fig.15 Another top view of the internal structure of a battery pack provided by the present invention;

[0043] Fig.16 for Fig.15 A partial enlarged schematic diagram of point E in the middle;

[0044] Fig.17 A schematic cross-sectional view of a frame member provided by the present invention;

[0045] Fig.18 The background technology of the present invention is a structural schematic diagram of related technologies.

[0046] Description of reference numerals:

[0047] Reference numerals of the present application:

[0048] 1. Battery box; 101. First frame; 1011. First mounting portion; 102. Second frame; 1021. Second mounting portion; 103. Third frame; 1031. Inclined portion; 1032. Straight portion; 104. Expansion beam; 1041. Adapter;

[0049] 2. battery cell; 201. first end; 202. second end;

[0050] 3. Support member; 30. Avoidance area; 301. Third support member; 3011. Matching portion; 302. First support member; 303. Second support member;

[0051] 4. Water cooling plate; 401. flow channel; 402. air avoidance portion; 403. support plate; 404. flow channel plate; 405. first extension portion; 406. second extension portion;

[0052] 5. Frame member; 501. Connecting portion; 5011. Connecting plate; 502. Frame portion; 5021. First main board; 5022. Second main board; 5023. First middle board; 5024. Second middle board; 503. Extending portion; 5031. Extending plate;

[0053] 6. Top water cooling plate;

[0054] 7. Glue and sealing gasket;

[0055] 8. Welding assembly;

[0056] 9. Mounting points and fasteners;

[0057] BACKGROUND ART Reference numerals related to related technologies:

[0058] d1. Battery box; d2. Profile plate. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0060] Combine the following Figure 1-Figure 17 , describing an embodiment of the present invention. The first direction is the length direction of the battery box 1, the second direction is the width direction of the battery box 1; and / or has three meanings: first, only A; second, only B; third, both A and B.

[0061] According to an embodiment of the present invention, a battery pack is provided. Figure 1 , Figure 2 , Figure 3 As shown, it includes: a battery box 1, a frame member 5, a first supporting structure, a water cooling plate 4 and a battery cell 2.

[0062] The battery box 1 is circumferentially provided with a plurality of frame members 5, which together form a receiving cavity, and any frame member 5 is provided with a first supporting structure extending toward the receiving cavity; the water-cooling plate 4 is at least partially mounted on the first supporting structure extending to the receiving cavity; a plurality of battery cells 2 are arranged on the water-cooling plate 4, and the first supporting structure supports the battery cells 2 through the water-cooling plate 4, so that the load of the battery cells 2 is dispersed to the plurality of frame members 5 through the first supporting structure.

[0063] In the above embodiment, multiple first supporting structures are arranged on multiple frame members 5, the water cooling plate 4 is mounted on at least one first supporting structure and multiple battery cells 2 are arranged on the water cooling plate 4, and the loads of the multiple battery cells 2 on the water cooling plate 4 are dispersed to the multiple frame members 5 of the battery box 1 through the first supporting structure, thereby reducing the load on the bottom plate of the battery box 1 under the water cooling plate 4, avoiding stress concentration on the connection between the bottom plate of the battery box 1 and the frame member 5, and improving the connection stability between the bottom plate and the frame member 5.

[0064] Specifically, the bottom plate of the conventional battery box 1 is directly connected to the frame member 5, the water-cooling plate 4 is placed on the bottom plate and the battery cell 2 is placed on the water-cooling plate 4; the first supporting structure extending toward the accommodating cavity is located on the bottom plate of the battery box 1 and supported by the bottom plate, so when the water-cooling plate 4 is placed on the bottom plate, the bottom plate can also support the bottom or side of the water-cooling plate 4 through the first supporting structure, thereby achieving the effect of dispersing the load of the battery cell 2 on the water-cooling plate 4.

[0065] Furthermore, this embodiment does not limit the molding form of the first support structure on the frame member 5. As an implementation, the first support structure is configured as a single structural member connected to the frame member 5; as another implementation, the first support structure is integrally formed on the frame member 5.

[0066] In one embodiment, Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 As shown, the frame member 5 is extended toward the accommodating cavity to form a mounting portion, and the side edge of the water-cooling plate 4 is extended toward the mounting portion to form an extension portion, and the extension portion is overlapped on the mounting portion.

[0067] In the above embodiment, the mounting parts are jointly supported by the extension parts of the side of the water cooling plate 4 , and the load of the battery cells 2 on the water cooling plate 4 is dispersed to the mounting parts through the extension parts of the water cooling plate 4 , and then dispersed to the frame member 5 .

[0068] Specifically, the water cooling plate 4 includes an upper and lower distribution support plate 403 and a flow channel plate 404. The connection between the support plate 403 and the flow channel plate 404 is located at the edge of the overall structure of the water cooling plate 4 and forms a thin plate structure. The mounting portion is used to support the thin plate structure of the water cooling plate 4.

[0069] In one embodiment, Figure 6 , Figure 8 As shown, the first supporting structure is integrally formed with the mounting portion.

[0070] In the above embodiment, the first supporting structure is integrally formed with the mounting portion, so that the first supporting structure and the frame member 5 are integrally formed, thereby improving the force transmission efficiency and facilitating demolding when producing parts, thereby improving production efficiency.

[0071] In one embodiment, Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8As shown, the frame member 5 includes two first frames 101 arranged opposite to each other, and a second frame 102 connected between the two first frames 101; the first supporting structure includes a first support member 302 and a second support member 303, the two first support members 302 are arranged in the same direction as the first frame 101, the second support member 303 is located between the two first support members 302, and the first support member 302 and the second support member 303 are jointly supported on the bottom of the water-cooled plate 4; the mounting portion includes a first mounting portion 1011 and a second mounting portion 1021, the first mounting portion 1011 is formed by extending the first frame 101 toward the accommodating cavity, and the second mounting portion 1021 is formed by extending the second frame 102 toward the accommodating cavity; the first support member 302 is integrally formed on the first mounting portion 1011, and the second support member 303 is integrally formed on the second mounting portion 1021.

[0072] In the above embodiment, the first support member 302 and the second support member 303 are jointly supported at the bottom of the water cooling plate 4, and the load of the battery cell 2 on the water cooling plate 4 is dispersed to the first support member 302 and the second support member 303 through the bottom of the water cooling plate 4, and then the load is dispersed to the first frame 101 and the second frame 102.

[0073] Specifically, the two relatively arranged first frames 101 are respectively arranged along the length direction of the battery box 1, that is, the first direction, and the second frame 102 is arranged along the width direction of the battery box 1, that is, the second direction. The two first frames 101 are respectively arranged as the two side frames of the battery box 1, and the second frame 102 is arranged as the rear frame of the battery box 1.

[0074] Furthermore, if Figure 6 , Figure 8 As shown, the extension portion of the water-cooling plate 4 includes a first extension portion 405 and a second extension portion 406. The first extension portion 405 is formed by a thin plate structure of the overall structure of the water-cooling plate 4 close to the edges of the two first frames 101, and the second extension portion 406 is formed by a thin plate structure of the overall structure of the water-cooling plate 4 close to the edges of the second frame 102. The first extension portion 405 is overlapped on the first mounting portion 1011, and the second extension portion 406 is overlapped on the second mounting portion 1021.

[0075] In one embodiment, Figure 3 , Figure 4 , Figure 5 , Fig. 9 As shown, the battery pack also includes a second support structure, which is arranged in the accommodating cavity in the same direction as the first frame 101 and is connected to the first support structure; the first support structure and the second support structure jointly support the water cooling plate 4.

[0076] In the above embodiment, the first supporting structure and the second supporting structure jointly support the water cooling plate 4 , further dispersing the load on the bottom plate of the battery box 1 , thereby further improving the connection stability between the bottom plate and the frame member 5 .

[0077] Specifically, the second support structure is configured as a support rod and spans the accommodating cavity of the battery box 1 along the first direction or the second direction. As an embodiment, the second support structure is configured along the first direction, that is, spanning the second frame 102 and the third frame 103; as another embodiment, the second support structure is configured along the second direction, that is, spanning the two first frames 101.

[0078] Furthermore, if Figure 6 , Figure 8 , Fig.10 The side of the water-cooling plate 4 is friction-stir welded to the first mounting portion 1011, the rear of the water-cooling plate 4 is friction-stir welded to the second mounting portion 1021, and the second support member 303 is friction-stir welded to the third support member 301. The use of friction-stir welding instead of bolt connection can avoid stress concentration on the connection surface, improve the overall rigidity of the battery pack, and reduce the probability of damage to the connection position of the components after the battery pack is hit.

[0079] In one embodiment, Figure 3 , Figure 4 , Figure 5 , Fig. 9 As shown, the second support structure includes one or more third support members 301 arranged in the same direction as the first frame 101; an air avoidance area 30 is formed between two adjacent third support members 301, and / or an air avoidance area 30 is formed between a third support member 301 and a first support member 302; when multiple battery cells 2 are arranged on the water-cooled plate 4, they fall in the air avoidance area 30, so that the third support member 301 and / or the first support member 302 support the ends of the battery cells 2.

[0080] In the above embodiment, the third support member 301 is used to support the ends of the two groups of battery cells 2 that are close to each other, and the two first support members 302 are used to support the ends of the two groups of battery cells 2 that are far away from each other, thereby achieving a stable support effect on the battery module formed by multiple battery cells 2.

[0081] Specifically, the third support member 301, the first support member 302 and the second support member 303 together constitute the support member 3, and the multiple support members 3 are distributed on the inner periphery of the frame member 5 to jointly support the water-cooling plate 4. In this embodiment, a third support member 301 is provided and located in the middle of the battery box 1, and two air-avoiding areas 30 are formed between the third support member 301 and the two first support members 302 on both sides. The third support member 301, the first support member 302 and the second support member 303 together constitute the support member 3 to replace the conventional profile plate, so that the laying range of the support device at the bottom of the battery box 1 can be reduced and the weight of the support device can be reduced.

[0082] In one embodiment, Fig. 9 , Fig.10 , Fig.11 , Fig.12 As shown, the water cooling plate 4 is formed with a plurality of flow channels 401 , a recessed avoidance portion 402 is formed between two adjacent flow channels 401 , at least a portion of the structure of the third support member 301 corresponds to the avoidance portion 402 to form a protruding matching portion 3011 , and the matching portion 3011 is embedded in the avoidance portion 402 .

[0083] In the above embodiment, the matching portion 3011 formed on the third support member 301 is arranged to correspond to the avoidance portion 402 formed between the two flow channels 401 of the water-cooling plate 4, so that the corresponding position of the third support member 301 and the water-cooling plate 4 are completely fitted together, and the supporting force of the third support member 301 on the battery cell 2 can be completely transmitted to the battery cell 2 set on the water-cooling plate 4 through the water-cooling plate 4, thereby improving the supporting stability of the third support member 301 on the battery cell 2.

[0084] Specifically, the support member 3 arranged along the first direction supports the first ends 201 and the second ends 202 of the plurality of battery cells 2, and supports the end positions on both sides of each battery cell 2. The length of the third support member 301 is equivalent to the length of the first frame 101 of the battery box 1. When laid on the bottom of the battery box 1, the water cooling plate 4 forms a stable support for the first ends 201 of the plurality of battery cells 2 arranged along the first direction and arranged opposite to each other.

[0085] Furthermore, the third support member 301, the water-cooling plate 4 and the longitudinal beam are sequentially connected from bottom to top through a screw connection process, thereby improving the connection stability of the internal structure of the battery pack.

[0086] Furthermore, regarding the matching relationship between the two first support members 302 and the two flow channels 401 of the water cooling plate 4 to form the avoidance portion 402, according to actual application requirements, a contour matching form of forming the avoidance portion 402 between the third support member 301 and the two flow channels 401 of the water cooling plate 4 can also be adopted.

[0087] Furthermore, the third support member 301, the two first support members 302 and the water cooling plate 4 are connected by double-sided adhesive.

[0088] Furthermore, the third support member 301 is configured as a profile member having a cavity, and its size specifications are as follows: Fig.13 , Fig.14 As shown, the overall width of the third support member 301 is 4.5mm~6mm; the vertical dimension of the cross section of the third support member 301 must meet the following requirements: the upper wall thickness L3 of the third support member 301 is 1.4mm~2.5mm, the lower wall thickness L5 of the third support member 301 is 1.4mm~2.5mm, the ratio of the upper wall thickness L3 to the lower wall thickness L5 is 0.9~1.1, and the cavity height L4 of the third support member 301 is 1.4mm~2.5mm; the transverse dimension of the cross section of the third support member 301 must meet the following requirements: the side wall thickness L6 of the third support member 301 is 2mm~3mm, the cavity width L7 of the non-matching portion 3011 of the third support member 301 is 10mm~50mm, the cavity width L9 of the matching portion 3011 of the third support member 301 is 10mm~50mm, and the distance between the two cavities in the third support member 301 is 2mm~12mm.

[0089] Furthermore, the water cooling plate 4 is composed of a support plate 403 in contact with the battery cell 2 and a flow channel plate 404 in contact with the support member 3. The flow channel plate 404 has an "S"-shaped structure. The flow channel plate 404 is close to the support plate 403 and is surrounded by the support plate 403 to form a flow channel 401, and the flow channel plate 404 is away from the support plate 403 to form a gap 402.

[0090] Furthermore, if Figure 2 As shown, the battery pack is arranged from top to bottom in sequence as a top water-cooling plate 6, glue and sealing gasket 7, battery cells 2, water-cooling plate 4, battery box 1, weld assembly 8 and mounting points and fasteners 9.

[0091] In one embodiment, Figure 3 , Figure 4 , Figure 6 , Fig. 9 As shown, two groups of multiple battery cells 2 are arranged side by side, and the second supporting structure includes a third supporting member 301; the third supporting member 301 is arranged between the two groups of battery cells 2, and is suitable for supporting the ends of the two groups of battery cells 2 that are close to each other, and the two first supporting members 302 are suitable for respectively supporting the ends of the two groups of battery cells 2 that are far away from each other.

[0092] In the above embodiment, a third support member 301 disposed between the two groups of battery cells 2 and located in the middle can ensure the structural strength of the battery pack near the middle position of the bottom plate of the battery box 1, so that the battery pack has sufficient structural strength to cope with the bottom scraping working condition test.

[0093] In one embodiment, Fig.15 , Fig.16 As shown, the frame member 5 further includes: a third frame 103 and an expansion beam 104 .

[0094] The third frame 103 is close to the front of the battery box 1 and connected between the two first frames 101. The third frame 103 includes two inclined portions 1031 respectively connected to the two first frames 101, and a straight portion 1032 connected between the two inclined portions 1031. The expansion beam 104 is connected to an adapter 1041 at least at one end. The inclined portion 1031 is provided with an installation groove suitable for embedding the adapter 1041. When the adapter 1041 is embedded in the installation groove, the adapter 1041 is perpendicular to the inclined portion 1031.

[0095] In the above embodiment, the expansion beam 104 is connected to the third frame 103 by using the adapter 1041. When the battery cell 2 expands for some reason and squeezes the expansion beam 104, the expansion beam 104 is subjected to force on the inclined portion 1031 of the third frame 103 to form two components of force parallel and perpendicular to the adapter 1041, thereby reducing the size of the expansion force directly acting on the connection between the expansion beam 104 and the third frame 103, reducing the influence of the expansion force on the connection between the expansion beam 104 and the third frame 103, and ensuring the connection stability between the expansion beam 104 and the third frame 103.

[0096] Specifically, Fig.16 As shown, when the adapter 1041 is embedded in the installation groove of the third frame 103 on the upper inclined portion 1031 of the third frame 103, the adapter 1041 is welded to the two side walls of the installation groove.

[0097] Furthermore, if Fig.16 As shown, when the battery cell 2 expands for some reason and squeezes the expansion beam 104 so that the expansion beam 104 is subjected to force, the weld connecting the adapter 1041 and the inclined portion 1031 of the third frame 103 is subjected to the action of the first force component and the second force component. The direction of the first force component is perpendicular to the setting direction of the adapter 1041, and a positive tearing tendency is generated on the weld. Appropriately reducing the first force component is helpful to protect the structural stability of the weld; the direction of the second force component is parallel to the setting direction of the adapter 1041, and a lateral tearing tendency is generated on the weld. The second force component has little effect on the structural stability of the weld.

[0098] Furthermore, the above arrangement solves the problem of excessive stress at the weld of the expansion beam 104 caused by the expansion of the battery cell, so that the stress at the weld is reduced by about 30%.

[0099] Furthermore, if Fig.15 , Fig.16 As shown, the included angle θ4 between the expansion beam 104 and the inclined portion 1031 is 45°.

[0100] In one embodiment, Fig.17 As shown, the first frame 101, the second frame 102 and the third frame 103 together form a frame member 5 of the battery box 1; the frame member 5 includes a connecting portion 501 arranged horizontally and suitable for connecting to the vehicle body, a frame portion 502 forming a side periphery of the battery box 1, and an extending portion 503 extending toward the battery cell 2 and suitable for connecting to the support member 3 and / or the water cooling plate 4, and the connecting portion 501, the frame portion 502 and the extending portion 503 are divided into a plurality of chambers by a plurality of plates.

[0101] In the above embodiment, the connecting portion 501, the frame portion 502 and the extension portion 503 of the frame member 5 are arranged in the form of multiple chamber partitions. When the battery pack is hit from the side, the interaction between the chambers is used to reduce the impact of the impact force on the internal battery cell 2, thereby effectively protecting the battery cell 2. The frame member 5 with multiple chambers effectively reduces the overall weight of the frame member 5. After the extension portion 503 is connected to the support member 3 and the water-cooling plate 4, the profile cross-section of the frame member 5 can transfer the lateral impact force to the support member 3 and the water-cooling plate 4 at the bottom of the battery cell 2, thereby reducing the probability of damage to the battery cell 2 under abuse conditions.

[0102] Specifically, Fig.17 As shown, the multiple chambers formed in the frame member 5 can interact with each other to absorb energy when the battery pack is hit from the side, so as to reduce the transmission of the impact force toward the battery cells 2 inside the frame member 5; at the same time, after the extension portion 503 is connected with the support member 3 and the water-cooling plate 4, the impact force of the frame member 5 hit from the side is finally transmitted to the support member 3 and the water-cooling plate 4, so as to prevent the impact force from finally acting on the battery cells 2 arranged above the support member 3 and the water-cooling plate 4.

[0103] Furthermore, after measurement, the battery pack of the new structure adopted in this embodiment has a 21% reduction in overall weight and a 55% reduction in cost through the material-reducing design of the support member 3 and the frame member 5 .

[0104] In one embodiment, Fig.17As shown, the connecting portion 501 includes a horizontally arranged connecting plate 5011; the frame portion 502 includes a vertically arranged first main board 5021, a second main board 5022, and a first intermediate board 5023 and a second intermediate board 5024 connected between the first main board 5021 and the second main board 5022. The first main board 5021 is connected to the connecting plate 5011, and the angle θ1 between the first intermediate board 5023 and the first main board 5021 is 40° to 45°. The second intermediate board 50 24 is connected to the connection between the first intermediate plate 5023 and the first main plate 5021, and the angle θ2 between the first main plate 5021 and the first main plate 5021 is 58°~63°; the extension portion 503 includes an extension plate 5031 connected to the second main plate 5022, and the angle θ3 between the extension plate 5031 and the second main plate 5022 is 53°~58°; the ratio of the height L2 from the bottom of the extension plate 5031 to the bottom of the connecting portion 501 to the height L1 of the connecting portion 501 is 0.51~0.54.

[0105] In the above embodiment, the impact force of the battery pack subjected to a lateral impact is transmitted to the first main board 5021 through the connecting plate 5011 of the connecting portion 501, and the first intermediate plate 5023 and the second intermediate plate 5024 connected to the first main board 5021 decompose the impact force transmitted by the connecting plate 5011 into two directions of their own, wherein the impact force of the first intermediate plate 5023 is transmitted to the lower part of the frame member 5, and the impact force of the second intermediate plate 5024 is transmitted to the relatively upper part of the frame member 5, and then transmitted to the lower part of the frame member 5 through the extension plate 5031 of the extension portion 503, thereby transmitting the impact force as a whole to the extension portion 503, thereby reducing the influence of the impact force on the battery cell 2.

[0106] Specifically, the connection plate 5011 , the first middle plate 5023 , and the second middle plate 5024 meet at one point when connected to the first main plate 5021 .

[0107] Although the embodiments of the present invention have been 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 battery box (1) is provided with a plurality of frame members (5) in a circumferential direction, the plurality of frame members (5) are combined to form a receiving cavity, and any of the frame members (5) is provided with a first supporting structure extending toward the receiving cavity; A water cooling plate (4) at least partially mounted on the first supporting structure extending to the accommodating cavity; A plurality of battery cells (2) are arranged on the water-cooling plate (4), and the first supporting structure supports the battery cells (2) via the water-cooling plate (4), so that the load of the battery cells (2) is dispersed to the plurality of frame members (5) via the first supporting structure.

2. The battery pack according to claim 1, characterized in that: The frame member (5) is extended toward the accommodating cavity to form a mounting portion, and the side edge of the water cooling plate (4) is extended toward the mounting portion to form an extension portion, and the extension portion is overlapped on the mounting portion.

3. The battery pack according to claim 2, characterized in that: The first supporting structure is integrally formed on the mounting portion.

4. The battery pack according to claim 3, characterized in that: The frame member (5) comprises two first frame members (101) arranged opposite to each other, and a second frame member (102) connected between the two first frame members (101); The first supporting structure comprises a first supporting member (302) and a second supporting member (303), the two first supporting members (302) are arranged in the same direction as the first frame (101), the second supporting member (303) is located between the two first supporting members (302), and the first supporting member (302) and the second supporting member (303) are jointly supported on the bottom of the water-cooling plate (4); The mounting portion comprises a first mounting portion (1011) and a second mounting portion (1021), the first mounting portion (1011) being formed by the first frame (101) extending toward the accommodating cavity, and the second mounting portion (1021) being formed by the second frame (102) extending toward the accommodating cavity; The first support member (302) is integrally formed on the first mounting portion (1011), and the second support member (303) is integrally formed on the second mounting portion (1021).

5. The battery pack according to claim 4, characterized in that: It also includes a second supporting structure, which is arranged in the accommodating cavity in the same direction as the first frame (101) and is connected to the first supporting structure; The first supporting structure and the second supporting structure jointly support the water cooling plate (4).

6. The battery pack according to claim 5, characterized in that: The second supporting structure comprises one or more third supporting members (301) arranged in the same direction as the first frame (101); A clearance area (30) is formed between two adjacent third support members (301), and / or a clearance area (30) is formed between one third support member (301) and one first support member (302); When the plurality of battery cells (2) are arranged on the water-cooling plate (4), they fall into the air-avoiding area (30), so that the third support member (301) and / or the first support member (302) support the ends of the battery cells (2).

7. The battery pack according to claim 6, characterized in that: The water cooling plate (4) is formed with a plurality of flow channels (401), a recessed avoidance portion (402) is formed between two adjacent flow channels (401), at least a portion of the structure of the third support member (301) corresponds to the avoidance portion (402) to form a protruding matching portion (3011), and the matching portion (3011) is embedded in the avoidance portion (402).

8. The battery pack according to claim 6 or 7, characterized in that: The plurality of battery cells (2) are arranged side by side in two groups, and the second supporting structure comprises a third supporting member (301); The third support member (301) is arranged between the two groups of battery cells (2) and is suitable for supporting the ends of the two groups of battery cells (2) that are close to each other, and the two first support members (302) are suitable for respectively supporting the ends of the two groups of battery cells (2) that are far away from each other.

9. The battery pack according to claim 4, characterized in that: The frame member (5) further comprises: A third frame (103) connected between the two first frames (101), the third frame (103) comprising two inclined portions (1031) respectively connected to the two first frames (101), and a straight portion (1032) connected between the two inclined portions (1031); The expansion beam (104) has at least one end connected to a transfer piece (1041), the inclined portion (1031) is provided with a mounting groove suitable for embedding the transfer piece (1041), and when the transfer piece (1041) is embedded in the mounting groove, the transfer piece (1041) is perpendicular to the inclined portion (1031).

10. The battery pack according to claim 1, characterized in that: The frame member (5) comprises a connecting portion (501) arranged horizontally and suitable for connecting to a vehicle body, a frame portion (502) forming a side periphery of the battery box (1), and an extending portion (503) extending toward the battery cell (2); the connecting portion (501), the frame portion (502) and the extending portion (503) are divided into a plurality of chambers by a plurality of plates.

11. The battery pack according to claim 10, characterized in that: The connecting portion (501) comprises a horizontally arranged connecting plate (5011); The frame portion (502) comprises a first main board (5021) and a second main board (5022) which are vertically arranged, and a first intermediate board (5023) and a second intermediate board (5024) which are connected between the first main board (5021) and the second main board (5022); the first main board (5021) is connected to the connecting board (5011); an angle θ1 between the first intermediate board (5023) and the first main board (5021) is 40° to 45°; the second intermediate board (5024) is connected to the connection between the first intermediate board (5023) and the first main board (5021); an angle θ2 between the second intermediate board (5024) and the first main board (5021) is 58° to 63°; The extension portion (503) comprises an extension plate (5031) connected to the second main plate (5022), and an included angle θ3 between the extension plate (5031) and the second main plate (5022) is 53° to 58°; The ratio of the height L2 from the bottom of the extension plate (5031) to the bottom of the connection portion (501) to the height L1 of the connection portion (501) is 0.51 to 0.54.

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