Battery module

Abstract

The invention relates to the technical field of batteries, in particular to a battery module which at least comprises a module body and further comprises an active heat dissipation system arranged below the module body, and the active heat dissipation system comprises a heat dissipation substrate fixed to the lower end face of the module body; the hinged grids are distributed on the lower end face of the heat dissipation substrate at equal intervals in the left-right direction, and the right end of each hinged grid is hinged to the heat dissipation substrate; the pull rod assembly is arranged on the lower squatting surface of the heat dissipation base plate in the left-right direction, and the pull rod assembly is located at the middle axis of the heat dissipation base plate in the front-back direction; the upper end of each hinge connecting rod is connected with the pull rod assembly, and the lower end of each hinge connecting rod is connected with the corresponding hinge grating. According to the battery module disclosed by the invention, the hinged grids of the active heat dissipation assembly are closed in a normal state to play a certain protection role on the module body, and when heat dissipation is needed, all the hinged grids are pulled by the pulling assembly to be synchronously opened, so that the heat dissipation effect of the module body is greatly improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery module. Background Art

[0002] The battery module is an important component of the lithium-ion battery system. It is mainly composed of multiple lithium-ion cells connected in series and parallel, and equipped with a single battery monitoring and management device. Its basic components include module control (usually called BMS slave board), battery cells, conductive connectors, plastic frames, cold plates, cooling pipes, pressure plates at both ends, and a set of fasteners that combine these components together. Battery modules have been widely used in the field of new energy vehicles, but since new energy vehicles frequently charge and discharge and generate a lot of heat, thermal management, i.e. heat dissipation, is required.

[0003] Existing heat dissipation methods include air cooling and even liquid cooling. The air cooling technology has a poor heat dissipation effect because the battery module is highly integrated on the electric vehicle chassis, resulting in a small area for contact with air. Therefore, it is necessary to consider designing a battery module that can increase the heat dissipation area. Summary of the invention

[0004] A battery module comprises at least a module body and an active heat dissipation system arranged below the module body, wherein the active heat dissipation system comprises:

[0005] A heat dissipation substrate is fixed to the lower end surface of the module body;

[0006] The hinged grilles are evenly spaced along the left-right direction and distributed on the lower end surface of the heat dissipation substrate, and the right end of each hinged grille is hinged to the heat dissipation substrate respectively;

[0007] A pull rod assembly is arranged on the lower surface of the heat dissipation substrate in the left-right direction, and the pull rod assembly is located at the center axis of the heat dissipation substrate in the front-back direction;

[0008] The articulated connecting rods correspond to the articulated grilles one by one, and the upper end of each articulated connecting rod is connected to the pull rod assembly and the lower end is connected to the corresponding articulated grille.

[0009] As a further implementation:

[0010] The articulated grille comprises a grille bottom plate, wherein a fixed side plate is respectively arranged at the front and rear ends of the upper end of the grille bottom plate, and each fixed side plate is rotatably provided with an articulated shaft assembly, and the articulated shaft assembly is connected to the lower end surface of the heat dissipation substrate.

[0011] As a further implementation:

[0012] The tie rod assembly comprises:

[0013] The rotating assembly comprises a right-mounted base column arranged on the right side of the lower end surface of the heat dissipation substrate, a built-in polished rod arranged on the left side of the lower end of the right-mounted base column, a limiting ring groove formed on the outer wall of the built-in polished rod, a left-mounted base column formed above the left side of the built-in polished rod and connected to the lower end surface of the heat dissipation substrate, an externally threaded tube rotatably arranged on the built-in polished rod, a limiting convex ring formed on the inner wall of the externally threaded tube and rotatably matched with the limiting ring groove, and a driven bevel gear formed on the right end of the externally threaded tube. The rotating assembly also comprises a driving motor arranged on the upper end surface of the heat dissipation substrate at the right side of the module body, and a driving bevel gear arranged below the output shaft of the driving motor and meshing with the driven bevel gear;

[0014] The pulling assembly comprises an internal threaded tube screwed on the outer wall of the external threaded tube, an upper hole formed on the upper part of the internal threaded tube and accommodating the left base column passing through, and a pull rod body arranged on the left side of the internal threaded tube, wherein the pull rod body passes through each hinged grille in sequence;

[0015] The upper end of the hinged connecting rod is hinged to the pull rod body.

[0016] As a further implementation:

[0017] The active heat dissipation system also includes a self-locking assembly and a buffer joint;

[0018] The self-locking assembly corresponds to the articulated grille one by one and is used to lock the horizontal posture of the articulated grille. The self-locking assembly includes:

[0019] The self-locking lock head comprises a connecting portion arranged on the left side of the upper end surface of the grille bottom plate and a locking portion arranged on the left side of the upper end of the connecting portion;

[0020] The self-locking lock body comprises a lock body base arranged on the lower end surface of the heat dissipation substrate, a right opening arranged on the right side of the lock body base, and a rod-penetrating side hole arranged above the left side of the right opening and accommodating the pull rod body to pass through;

[0021] The self-locking lock cylinder comprises an active rack formed on the lower end surface of the pull rod body and located at the right opening, a transmission gear rotatably arranged in the right opening and meshing with the active rack, a guide cross bar arranged at the lower left side of the right opening, and a driven rack slidably sleeved on the guide cross bar and meshing with the transmission gear;

[0022] The buffer joint corresponds to the hinged connecting rod one by one, and is used to realize the connection between the upper end of the hinged connecting rod and the pull rod body. The buffer joint includes:

[0023] An axial annular groove is formed on the outer wall of the tie rod body;

[0024] A buffer compression spring is wound around the right side of the outer wall of the pull rod body;

[0025] A sliding base is slidably mounted on the pull rod body and abuts against the left side of the buffer compression spring;

[0026] The hinged circular hole is arranged below the sliding base and is hinged to the upper end of the hinged connecting rod.

[0027] Beneficial effects:

[0028] The battery module described in this case is arranged below the chassis frame of the electric vehicle so that the lower end surface of the battery module can be in contact with the air as a whole for heat dissipation.

[0029] In the battery module described in this case, the hinged grilles of the active heat dissipation assembly are normally closed, which provides a certain degree of protection for the module body. When heat dissipation is required, all the hinged grilles are opened synchronously by pulling the assembly, thereby greatly improving the heat dissipation effect of the module body.

[0030] The battery module described in this case can lock the closed state of the articulated grille through the self-locking assembly, increase the reliability of the closed state of the articulated grille, and reduce the mechanical loss of the tie rod assembly and the articulated connecting rod: when the self-locking assembly does not lock the closed state of the articulated grille, the closed state of the articulated grille is achieved by the tension of the tie rod assembly and the articulated connecting rod on the articulated grille, which generates continuous mechanical stress on the tie rod assembly and the articulated connecting rod. After the self-locking assembly locks the articulated grille, the closed state of the articulated grille can be effectively locked through the mechanical structure, and it will not loosen even on bumpy roads, thereby enhancing reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a top view of an embodiment of the battery module.

[0032] Figure 2 yes Figure 1 Section view of section A-A.

[0033] Figure 3 yes Figure 2 Partial schematic diagram.

[0034] Figure 4 yes Figure 3 Enlarged schematic diagram of part B in the middle.

[0035] Figure 5 It is a cross-sectional view of the closed state of the first embodiment of the active heat dissipation system.

[0036] Figure 6 It is a partial schematic diagram of the closed state of the first embodiment of the active heat dissipation system.

[0037] Figure 7 It is a partial schematic diagram of the open state of the first embodiment of the active heat dissipation system.

[0038] Figure 8 It is a partial schematic diagram of a state of the second embodiment of the active heat dissipation system.

[0039] Fig. 9 It is a partial schematic diagram of another state of the second embodiment of the active heat dissipation system.

[0040] Fig.10 It is a partial schematic diagram of yet another state of the second embodiment of the active heat dissipation system.

[0041] Fig.11 yes Figure 8 Enlarged schematic diagram of part C in the middle.

[0042] Fig.12 yes Fig. 9 Enlarged schematic diagram of part D in the middle.

[0043] Fig.13 1 is a top view of an embodiment of an articulated grille.

[0044] Fig.14 is a cross-sectional view of an embodiment of an articulated grille.

[0045] In the figure:

[0046] 1. Heat dissipation substrate, 11. Thermal conductive pad;

[0047] 2. Articulated grille, 21. Grille bottom plate, 22. Fixed side plate, 23. Articulated shaft assembly, 24. Heat dissipation middle plate;

[0048] 3. Tie rod assembly;

[0049] 31. Rotating assembly, 311. Right-mounted base column, 312. Internal polished rod, 313. Limiting ring groove, 314. Left-mounted base column, 315. Externally threaded tube, 316. Limiting convex ring, 317. Driven bevel gear, 318. Driving motor, 319. Active bevel gear;

[0050] 32. Pulling assembly, 321. Internally threaded tube, 322. Accommodating upper hole, 323. Pull rod body;

[0051] 4. Articulated connecting rod;

[0052] 5. Self-locking assembly;

[0053] 51. Self-locking lock head, 511. Connecting part, 512. Locking part;

[0054] 52. Self-locking lock body, 521. Lock body base, 522. Right opening, 523. Side hole for penetrating rod;

[0055] 53. self-locking lock core, 531. driving rack, 532. transmission gear, 533. guide cross bar, 534. driven rack, 535. longitudinal through hole, 536. limit connecting rod;

[0056] 6. Buffer joint, 61. Axial ring groove, 62. Buffer compression spring, 63. Sliding base, 64. Articulated circular hole;

[0057] 8. Active heat dissipation assembly;

[0058] 9. Module body. DETAILED DESCRIPTION

[0059] A battery module is arranged below a chassis frame of an electric vehicle so that the lower end surface of the battery module can be in contact with air as a whole for heat dissipation.

[0060] The battery module at least includes a module body 9, and also includes an active heat dissipation system 8 arranged below the module body 9, and the active heat dissipation system 8 includes:

[0061] The heat dissipation substrate 1 is fixed to the lower end surface of the module body 9;

[0062] The hinged grilles 2 are evenly spaced along the left-right direction and distributed on the lower end surface of the heat dissipation substrate 1, and the right end of each hinged grille 2 is hinged to the heat dissipation substrate 1 respectively;

[0063] The pull rod assembly 3 is arranged on the lower surface of the heat dissipation substrate 1 along the left-right direction, and the pull rod assembly 3 is located at the central axis of the heat dissipation substrate 1 in the front-back direction;

[0064] The articulated connecting rods 4 correspond to the articulated grilles 2 one by one, and the upper end of each articulated connecting rod 4 is connected to the pull rod assembly 3 and the lower end is connected to the corresponding articulated grille 2.

[0065] As a further implementation:

[0066] The articulated grille 2 comprises a grille bottom plate 21 , and a fixed side plate 22 is respectively provided at the front and rear ends of the upper end of the grille bottom plate 21 , and a hinge shaft assembly 23 is rotatably provided on each fixed side plate 22 , and the hinge shaft assembly 23 is connected to the lower end surface of the heat dissipation substrate 1 .

[0067] As a further implementation:

[0068] The tie rod assembly 3 comprises:

[0069] The rotating assembly 31 comprises a right-mounted base column 311 arranged on the right side of the lower end surface of the heat dissipation substrate 1, a built-in polished rod 312 arranged on the left side of the lower end of the right-mounted base column 311, a limiting ring groove 313 formed on the outer wall of the built-in polished rod 312, a left-mounted base column 314 formed on the upper left side of the built-in polished rod 312 and connected to the lower end surface of the heat dissipation substrate 1, an externally threaded tube 315 rotatably arranged on the built-in polished rod 312, a limiting convex ring 316 formed on the inner wall of the externally threaded tube 315 and rotatably matched with the limiting ring groove 313, and a driven bevel gear 317 formed on the right end of the externally threaded tube 315. The rotating assembly 31 also comprises a driving motor 318 arranged on the upper end surface of the heat dissipation substrate 1 at the right side of the module body 9, and a driving bevel gear 319 arranged below the output shaft of the driving motor 318 and meshing with the driven bevel gear 317;

[0070] The pulling assembly 32 includes an internal threaded tube 321 screwed to the outer wall of the external threaded tube 315, an upper receiving hole 322 formed above the internal threaded tube 321 and accommodating the left base column 314 to pass through, and a pull rod body 323 arranged on the left side of the internal threaded tube 321. The pull rod body 323 passes through each hinged grille 2 in sequence.

[0071] The upper end of the hinged connecting rod 4 is hinged to the pull rod body 323 .

[0072] As a further implementation:

[0073] The active heat dissipation system 8 also includes a self-locking assembly 5 and a buffer joint 6;

[0074] The self-locking assembly 5 corresponds to the hinged grille 2 one by one, and is used to lock the horizontal posture of the hinged grille 2. The self-locking assembly 5 includes:

[0075] The self-locking lock head 51 includes a connecting portion 511 disposed on the left side of the upper end surface of the grille bottom plate 21 and a locking portion 512 disposed on the left side of the upper end of the connecting portion 511;

[0076] The self-locking lock body 52 comprises a lock body base 521 disposed on the lower end surface of the heat dissipation substrate 1, a right opening 522 disposed on the right side of the lock body base 521, and a rod-penetrating side hole 523 disposed on the upper left side of the right opening 522 and accommodating the pull rod body 323 to pass through;

[0077] The self-locking lock cylinder 53 includes an active rack 531 formed on the lower end surface of the pull rod body 323 and located at the right opening 522, a transmission gear 532 rotatably disposed in the right opening 522 and meshing with the active rack 531, a guide cross bar 533 disposed at the lower left side of the right opening 522, and a driven rack 534 slidably sleeved on the guide cross bar 533 and meshing with the transmission gear 532;

[0078] The buffer joint 6 corresponds to the hinged connecting rod 4 one by one, and is used to realize the connection between the upper end of the hinged connecting rod 4 and the pull rod body 323. The buffer joint 6 includes:

[0079] An axial annular groove 61 is formed on the outer wall of the pull rod body 323;

[0080] The buffer compression spring 62 is wound around the right side of the outer wall of the pull rod body 323;

[0081] A sliding base 63 is slidably mounted on the pull rod body 323 and abuts against the left side of the buffer compression spring 62;

[0082] The hinged circular hole 64 is arranged below the sliding base 63 and is hinged to the upper end of the hinged connecting rod 4 .

[0083] As a further implementation:

[0084] A heat-conducting pad 11 is further provided between the heat dissipation substrate 1 and the module body 9 .

[0085] As a further implementation:

[0086] The hinge point P between the hinge connecting rod 4 and the hinge grille is lower than the center position Q of the hinge circular hole 64 .

[0087] As a further implementation:

[0088] The upper end surface of the grille bottom plate 21 is provided with heat dissipation middle plates 24 at equal intervals in the front-to-back direction.

[0089] As a further implementation:

[0090] The heat dissipation middle plate 24 is disposed on the upper end surface of the grille bottom plate 21 along the left-right direction.

[0091] As a further implementation:

[0092] The self-locking lock core 53 further includes a longitudinal through hole 535 provided in the guide cross bar 533 , and a limiting connecting rod 536 formed inside the driven rack 534 and plugged into and matched with the longitudinal through hole 535 .

[0093] This case also discloses an active heat dissipation method for a battery module, comprising the following steps:

[0094] Step 1, unlock the hinged grille 2 flipping degrees of freedom:

[0095] As the instruction manual Figure 4 As shown:

[0096] The driving motor 318 drives the active bevel gear 319 to rotate, thereby driving the driven bevel gear 317 and the external threaded tube 315 to rotate;

[0097] The external threaded tube 315 rotates to drive the internal threaded tube 321 and the pull rod body 323 to move rightward;

[0098] As the instruction manual Figure 8 , 9 , 11, 12 as shown:

[0099] The pull rod body 323 and the axial ring groove 61 move rightward relative to the sliding base 63, and the buffer compression spring 62 is continuously expanded until the axial ring groove 61 abuts against the left side of the sliding base 63;

[0100] The pull rod body 323 drives the active rack 531 to move rightward, and then drives the driven rack 534 to move leftward through the transmission gear 532, until the right side of the driven rack 534 is offset from the locking portion 512, thereby unlocking the freedom of the hinged grille 2 to flip downward;

[0101] Step 2, hinged grille 2 opens:

[0102] As the instruction manual Fig.10 As shown:

[0103] The driving motor 318 continues to rotate and drives the pull rod body 323 to continue to move rightward;

[0104] The axial annular groove 61 and the sliding base 63 move rightward, thereby driving the hinged connecting rod 4 and the hinged grille 2 to open downward.

[0105] Step 3, reset:

[0106] Step 3.1, hinged grille 2 closed:

[0107] The driving motor 318 rotates in a direction opposite to that in step 1 and step 2, and the pull rod body 323 moves to the left;

[0108] The buffer compression spring 62 drives the sliding base 63 and the hinged circular hole 64 to move leftward, thereby driving the left side of the hinged connecting rod 4 to move leftward so that its posture gradually approaches horizontal, and drives the hinged grille 2 to gradually close;

[0109] Step 3.2, locking the flipping freedom of the hinged grille 2:

[0110] The pull rod body 323 continues to move to the left and compresses the buffer spring 62. At the same time, the active rack 531 moves to the left and drives the driven rack 534 to move to the right through the transmission gear 523. The driven rack 534 is blocked under the locking portion 512 to lock the hinged grille 2.

Claims

1. A battery module, comprising at least a module body (9), characterized in that: It also includes an active heat dissipation system (8) arranged below the module body (9), and the active heat dissipation system (8) includes: A heat dissipation substrate (1) is fixed to the lower end surface of the module body (9); The hinged grilles (2) are evenly spaced and distributed on the lower end surface of the heat dissipation substrate (1) in the left-right direction, and the right end of each hinged grille (2) is hinged to the heat dissipation substrate (1) respectively; A pull rod assembly (3) is arranged on the lower surface of the heat dissipation substrate (1) along the left-right direction, and the pull rod assembly (3) is located at the center axis of the heat dissipation substrate (1) in the front-back direction; The hinged connecting rods (4) correspond one to one with the hinged grilles (2); the upper end of each hinged connecting rod (4) is connected to the pull rod assembly (3) and the lower end is connected to the corresponding hinged grille (2).

2. A battery module according to claim 1, characterized in that: The hinged grille (2) comprises a grille bottom plate (21), and a fixed side plate (22) is respectively provided at the front and rear ends of the upper end of the grille bottom plate (21). A hinge shaft assembly (23) is rotatably provided on each fixed side plate (22), and the hinge shaft assembly (23) is connected to the lower end surface of the heat dissipation substrate (1).

3. A battery module according to claim 2, characterized in that: The tie rod assembly (3) comprises: The rotating assembly (31) comprises a right-positioned base column (311) arranged on the right side of the lower end surface of the heat dissipation substrate (1), an internal polished rod (312) arranged on the left side of the lower end of the right-positioned base column (311), a limiting ring groove (313) formed on the outer wall of the internal polished rod (312), a left-positioned base column (314) formed on the upper left side of the internal polished rod (312) and connected to the lower end surface of the heat dissipation substrate (1), an externally threaded tube (315) rotatably arranged on the internal polished rod (312), A limiting convex ring (316) formed on the inner wall of the external threaded tube (315) and rotatably matched with the limiting ring groove (313), and a driven bevel gear (317) formed on the right end of the external threaded tube (315), the rotating assembly (31) further comprising a driving motor (318) arranged on the upper end surface of the heat dissipation substrate (1) at the right side of the module body (9), and a driving bevel gear (319) arranged below the output shaft of the driving motor (318) and meshing with the driven bevel gear (317); The pulling assembly (32) comprises an internally threaded tube (321) screwed onto the outer wall of the externally threaded tube (315), an upper receiving hole (322) formed above the internally threaded tube (321) and accommodating the left-positioned base column (314) passing therethrough, and a pulling rod body (323) arranged on the left side of the internally threaded tube (321), wherein the pulling rod body (323) passes through each of the hinged grilles (2) in sequence; The upper end of the hinged connecting rod (4) is hinged to the pull rod body (323).

4. A battery module according to claim 3, characterized in that: The active heat dissipation system (8) further comprises a self-locking assembly (5) and a buffer joint (6); The self-locking assembly (5) corresponds to the hinged grille (2) one by one and is used to lock the horizontal posture of the hinged grille (2). The self-locking assembly (5) includes: The self-locking lock head (51) comprises a connecting portion (511) provided on the left side of the upper end surface of the grille bottom plate (21) and a locking portion (512) provided on the left side of the upper end of the connecting portion (511); The self-locking lock body (52) comprises a lock body base (521) arranged on the lower end surface of the heat dissipation substrate (1), a right opening (522) arranged on the right side of the lock body base (521), and a rod-penetrating side hole (523) arranged above the left side of the right opening (522) and accommodating the pull rod body (323) to pass through; The self-locking lock core (53) comprises an active rack (531) formed on the lower end surface of the pull rod body (323) and located at the right opening (522), a transmission gear (532) rotatably disposed in the right opening (522) and meshing with the active rack (531), a guide cross bar (533) disposed at the lower left side of the right opening (522), and a driven rack (534) slidably sleeved on the guide cross bar (533) and meshing with the transmission gear (532); The buffer joint (6) corresponds to the hinged connecting rod (4) one by one, and is used to realize the connection between the upper end of the hinged connecting rod (4) and the pull rod body (323). The buffer joint (6) comprises: An axial annular groove (61) formed on the outer wall of the pull rod body (323); A buffer compression spring (62) is wound around the right side of the outer wall of the pull rod body (323); A sliding base (63) is slidably mounted on the pull rod body (323) and abuts against the left side of the buffer compression spring (62); The hinged circular hole (64) is arranged below the sliding base (63) and is hinged to the upper end of the hinged connecting rod (4).

5. A battery module according to claim 4, characterized in that: A heat-conducting pad (11) is also provided between the heat dissipation substrate (1) and the module body (9).

6. A battery module according to claim 5, characterized in that: The position of the hinge point P between the hinge connecting rod (4) and the hinge grille is lower than the hole center position Q of the hinge circular hole (64).

7. A battery module according to claim 5 or 6, characterized in that: The upper end surface of the grille bottom plate (21) is provided with heat dissipation middle plates (24) distributed at equal intervals in the front-to-back direction.

8. A battery module according to claim 7, characterized in that: The heat dissipation middle plate (24) is arranged on the upper end surface of the grille bottom plate (21) along the left-right direction.

9. A battery module according to claim 8, characterized in that: The self-locking lock core (53) further comprises a longitudinal through hole (535) provided in the guide cross bar (533), and a limiting connecting rod (536) formed inside the driven rack (534) and plug-fitted with the longitudinal through hole (535).

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