Battery module and battery pack

Abstract

The utility model relates to the technical field of power batteries, and discloses a battery module and a battery pack, the battery module comprises battery cells, a plurality of battery cells are arranged along the longitudinal direction to form a battery column, a plurality of battery columns are arranged along the transverse direction, and at least one side surface of each battery cell in the transverse direction is provided with an insulating film window; the heat-conducting structural adhesive is coated on the side surface, provided with the insulating film window, of the battery cell to form an adhesive coating area, and the adhesive coating area covers the insulating film window; the cold plate is arranged between the two battery columns and extends in the longitudinal direction, and the side face of the cold plate is bonded with at least one battery column through a heat conduction structural adhesive. According to the utility model, the cold plates are arranged between the adjacent battery columns, so that the cold plates are used for cooling the side surfaces of the battery cells, and the heat extraction performance of the battery is effectively improved; an insulating film window is formed in the side surface of the battery cell, so that the bonding strength of the battery cell and the cold plate is improved; and the gluing area is covered with the insulating film window, so that the insulation requirement and the structural strength requirement of the battery cell are met.

Description

Technical Field

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

[0002] With the continuous growth of global energy demand and the improvement of environmental awareness, the research and development and application of new energy battery packs, as core components of electric vehicles and other new energy vehicles, have received extensive attention. New energy vehicles use non-fossil energy such as electricity as power, which helps reduce greenhouse gas emissions and environmental pollution. Therefore, the research and development of new energy battery packs meets the requirements of energy structure transformation and sustainable development.

[0003] In order to improve the battery life of the battery pack, it is necessary to increase the power of the battery pack within the limited battery pack space, and the heat generated by the battery cells in the battery pack also needs to be discharged in time. The battery pack in the prior art has poor heat dissipation performance and low battery safety. Utility Model Content

[0004] In view of this, the utility model provides a battery module and a battery pack to solve the problems of poor heat dissipation performance and low battery safety.

[0005] In a first aspect, the utility model provides a battery module, comprising: a battery cell, wherein a plurality of the battery cells are arranged longitudinally to form a battery column, and a plurality of the battery columns are arranged transversely, and an insulating film window is provided on at least one transverse side of the battery cell; a thermally conductive structural adhesive is applied to the side of the battery cell having the insulating film window to form a glue coating area, and the glue coating area covers the insulating film window; a cold plate is arranged between two columns of the battery columns, the cold plate extends longitudinally, and the side of the cold plate is bonded to at least one column of the battery columns through the thermally conductive structural adhesive.

[0006] Beneficial effects: By setting a cold plate between adjacent battery columns, the cold plate is used to cool the side of the battery cell, effectively improving the heat dissipation performance of the battery; by opening an insulating film window on the side of the battery cell, the bonding strength between the battery cell and the cold plate is improved; and the insulating film window is covered with the glue coating area to meet the insulation requirements and structural strength requirements of the battery cell.

[0007] In an optional embodiment, the battery module further includes a glue blocking structure, wherein the glue blocking structure is disposed between the cold plate and the battery cell, and the glue blocking structure is disposed corresponding to at least one side edge of the glue coating area.

[0008] Beneficial effect: By setting up the glue blocking structure, the thermal conductive structural glue is prevented from overflowing between the large surfaces of adjacent battery cells, thereby ensuring the cycle life of the battery cells.

[0009] In an optional embodiment, the width of the glue blocking structure is W3, satisfying 5mm≤W3≤10mm; and / or, along the height direction of the battery cell, the height of the glue blocking structure is H3, and the height of the side of the battery cell with the insulating film window is H0, satisfying 0.84≤H3 / H0≤0.9.

[0010] Beneficial effects: By limiting the width of the glue blocking structure, while ensuring that the thermal conductive structural glue does not overflow, the influence of the glue blocking structure on the connection strength between the side of the battery cell and the cold plate is reduced; by limiting the height of the glue blocking structure, while improving the battery cell mode, the bus stress of the battery cell and the side beam stress of the battery pack body are prevented from exceeding the threshold.

[0011] In an optional embodiment, the cold plate includes a main body and a supporting portion, the upper surface of the supporting portion is connected to the bottoms of two adjacent columns of the battery columns, the main body is connected to the supporting portion and is located between the two adjacent columns of the battery columns, and a flow channel is formed inside the main body.

[0012] Beneficial effect: When the battery module is arranged in the battery pack box, the support part is provided to support the battery cell and reduce the force on the bottom of the battery cell.

[0013] In an optional embodiment, the battery module further includes a transfer structure, the transfer structure is connected to the cold plate, the transfer structure is communicated with the flow channel of the cold plate, and the transfer structure is suitable for connection to a battery pack box.

[0014] In an optional implementation, the area of ​​the side of the battery cell where the insulating film window is opened is S0, and the area of ​​the insulating film window is S1, satisfying 0.2≤S1 / S0≤0.4.

[0015] Beneficial effect: By limiting the size of the openings in the insulating film, the bonding strength between the battery cell and other adjacent structures is improved while ensuring the insulation requirements of the battery cell.

[0016] In an optional implementation, the area of ​​the side of the battery cell where the insulating film window is opened is S0, and the area of ​​the glue-coated area is S2, satisfying 0.7≤S2 / S0≤0.8.

[0017] Beneficial effect: By limiting the area size of the glue coating area, the busbar stress of the battery cell and the side beam stress of the battery pack body are prevented from exceeding the threshold while improving the battery cell mode.

[0018] In an optional implementation, the height of the side of the battery cell with the insulating film window is H0, the height of the insulating film window is H1, and the height of the glue coating area is H2, satisfying H1≤H2≤0.84H0.

[0019] In an optional embodiment, the width of the side of the battery cell with the insulating film window is W0, the width of the insulating film window is W1, and the width of the glue coating area is W2, satisfying W1≤W2≤0.81W0.

[0020] In a second aspect, the utility model also provides a battery pack, comprising the above-mentioned battery module. 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 structure of a battery module according to an embodiment of the utility model;

[0023] Figure 2 It is a schematic diagram of the three-dimensional structure of the battery cell and the cold plate of an embodiment of the utility model;

[0024] Figure 3 It is a schematic diagram of the planar structure of the battery cell and the cold plate of an embodiment of the utility model;

[0025] Figure 4 This is a schematic diagram of the planar structure of two adjacent battery cells and a glue blocking structure according to an embodiment of the utility model;

[0026] Figure 5 It is a partial structural schematic diagram of a battery pack according to an embodiment of the utility model.

[0027] Description of reference numerals:

[0028] 10. Battery cell; 11. Insulation film window; 21. Glue coating area; 30. Cold plate; 31. Main body; 32. Support part; 40. Glue blocking structure; 50. Transfer structure; 60. Battery pack body. DETAILED DESCRIPTION

[0029] 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.

[0030] Combine the following Figures 1 to 5 , describing an embodiment of the utility model.

[0031] According to an embodiment of the utility model, on the one hand, a battery module is provided, including a battery cell 10, a thermally conductive structural adhesive and a cold plate 30. A plurality of battery cells 10 are provided, and a plurality of battery cells 10 are arranged in a longitudinal direction to form a battery column, and a plurality of battery columns are arranged in a transverse direction, and an insulating film window 11 is provided on at least one side of the battery cell 10 in the transverse direction; the thermally conductive structural adhesive is applied to the side of the battery cell 10 with the insulating film window 11 to form a glue coating area 21, and the glue coating area 21 covers the insulating film window 11; the cold plate 30 is provided between two battery columns, and the cold plate 30 is extended in the longitudinal direction, and the side of the cold plate 30 is bonded to at least one battery column by the thermally conductive structural adhesive.

[0032] The battery module of this embodiment is applied, by arranging a cold plate 30 between adjacent battery columns, so that the cold plate 30 is used to cool the side of the battery cell 10, thereby effectively improving the heat dissipation performance of the battery; by opening an insulating film window 11 on the side of the battery cell 10, the bonding strength between the battery cell 10 and the cold plate 30 is improved; and the glue coating area 21 covers the insulating film window 11, thereby meeting the insulation requirements and structural strength requirements of the battery cell 10.

[0033] Specifically, the two lateral sides of the battery cell 10 are provided with insulating film windows 11 , and the two opposite sides of the cold plate 30 are respectively bonded to two adjacent battery columns by heat-conductive structural adhesive.

[0034] Of course, in other alternative embodiments, according to the design requirements of the battery module, the insulating film window 11 may be opened only on one lateral side of the battery cell 10, and accordingly, the side of the cold plate 30 is only bonded to the corresponding battery column.

[0035] Specifically, in the present embodiment, the height of the battery cell 10 is 102 mm, the width of the battery cell 10 in the longitudinal direction is 52 mm, and the insulating film opening 11 is opened corresponding to the side surface of the battery cell 10 formed by the height direction and the longitudinal direction.

[0036] It should be noted that if there is a partial area of ​​the insulating film window 11 opened on the battery cell 10 that is not coated with the thermal conductive structural adhesive, the insulation performance of the battery cell 10 will be affected, and the connection strength between the battery cell 10 and the cold plate 30 in this area will also be affected.

[0037] It should be noted that the coating thickness of the thermal conductive structural adhesive is 0.5mm-2.5mm.

[0038] It should be noted that when the coating thickness of the thermally conductive structural adhesive is less than 0.5 mm, the connection strength between the battery cell 10 and the cold plate 30 is low, affecting the structural strength of the battery module; when the coating thickness of the thermally conductive structural adhesive is greater than 2.5 mm, the thermally conductive structural adhesive is too thick, and after the battery cell 10 is bonded to the cold plate 30, the thermally conductive structural adhesive is squeezed and easily overflows from the coating area 21 into between two adjacent battery cells 10, thereby affecting the cycle life of the battery cell 10.

[0039] In one embodiment, Figure 3 As shown, the battery module further includes a glue blocking structure 40, which is disposed between the cold plate 30 and the battery cell 10, and the glue blocking structure 40 is disposed corresponding to at least one side edge of the glue coating area 21. By providing the glue blocking structure 40, the heat conductive structural glue is prevented from overflowing between the large surfaces of adjacent battery cells 10, thereby ensuring the cycle life of the battery cell 10.

[0040] In this embodiment, the adhesive blocking structure 40 is foam.

[0041] Specifically, the adhesive blocking structure 40 is disposed on the cold plate 30 . When the cold plate 30 is bonded to the battery cell 10 by means of the thermally conductive structural adhesive, the adhesive blocking structure 40 abuts against the side of the battery cell 10 and is squeezed and compressed between the side of the battery cell 10 and the cold plate 30 .

[0042] For details, please refer to Figure 1 , Figure 3 and Figure 4 In this embodiment, three glue blocking structures 40 are provided on each battery cell 10, which are respectively arranged above, on the left side and on the right side of the glue coating area 21, wherein the glue blocking structure 40 located above the glue coating area 21 is extended longitudinally so as to be simultaneously arranged corresponding to several battery cells 10 in a battery column.

[0043] Of course, according to the actual needs of the battery module, the glue blocking structure 40 located above the glue coating area 21 can also be arranged in sections, and each section is arranged corresponding to a battery cell 10 in a battery column.

[0044] It should be noted that the number of the glue blocking structures 40 can be one, two, etc. according to actual needs.

[0045] In one embodiment, Figure 3 As shown, the width of the adhesive blocking structure 40 is W3, which satisfies 5mm≤W3≤10mm. By limiting the width of the adhesive blocking structure 40, the effect of the adhesive blocking structure 40 on the connection strength between the side of the battery cell 10 and the cold plate 30 is reduced while ensuring that the thermal conductive structure adhesive does not overflow.

[0046] It should be noted that when W3 is less than 5 mm, the width of the glue blocking structure 40 is relatively small, and the thermal conductive structural glue is easy to overflow the glue blocking structure 40 and enter between adjacent battery cells 10, thereby affecting the cycle life of the battery cells 10; when W3 is greater than 10 mm, the width of the glue blocking structure 40 is too wide, and the area occupied by the side of the battery cell 10 is too large, thereby affecting the area of ​​the glue coating area 21 and affecting the connection strength between the side of the battery cell 10 and the cold plate 30.

[0047] In one embodiment, Figure 3 As shown, along the height direction of the battery cell 10, the height of the glue blocking structure 40 is H3, and the height of the side of the battery cell 10 with the insulating film window 11 is H0, which satisfies 0.84≤H3 / H0≤0.9. By limiting the height of the glue blocking structure 40, the busbar stress of the battery cell 10 and the side beam stress of the battery pack box 60 are prevented from exceeding the threshold while improving the mode of the battery cell 10.

[0048] It should be noted that along the height direction of the battery cell 10, the height of the glue-coated area 21 should be lower than the height of the glue-blocking structure 40 to prevent overflow of the thermal conductive structural glue. When H3 / H0<0.84, the height of the glue-blocking structure 40 is relatively small, and the height of the glue-coated area 21 is also affected, affecting the area of ​​the glue-coated area 21, and further affecting the mode of the battery cell 10; when H3 / H0>0.9, the height of the glue-blocking structure 40 is relatively high, and the contact area between the glue-blocking structure 40 and the battery cell 10 is increased, thereby increasing the bus stress of the battery cell 10 and the side beam stress of the battery pack body 60, which exceed the required range.

[0049] It should be noted that the length of the glue blocking structure 40 disposed above the glue coating area 21 can be selected according to the longitudinal length of the battery column.

[0050] In one embodiment, Figure 2 As shown, the cold plate 30 includes a main body 31 and a support portion 32. The upper surface of the support portion 32 is connected to the bottom of two adjacent battery columns. The main body 31 is connected to the support portion 32 and is located between the two adjacent battery columns. A flow channel is formed inside the main body 31.

[0051] Specifically, two opposite side surfaces of the main body 31 are bonded to the two battery columns by means of a heat-conducting structural adhesive.

[0052] Specifically, in this embodiment, the main body portion 31 and the support portion 32 are integrally formed and form a T-shaped structure.

[0053] Of course, in other alternative embodiments, the main body 31 and the support portion 32 may also be provided separately and connected via structures such as connectors.

[0054] In one embodiment, Figure 1As shown, the battery module further includes a transfer structure 50 , which is connected to the cold plate 30 , and the flow channels of the transfer structure 50 and the cold plate 30 are connected, and the transfer structure 50 is suitable for connecting to the battery pack box 60 .

[0055] Specifically, a flow channel is also provided inside the adapter structure 50 , and the flow channel of the adapter structure 50 is connected to the flow channel of the cold plate 30 ; specifically, the adapter structure 50 is connected to the battery pack box 60 by bolts.

[0056] In one embodiment, the area of ​​the side of the battery cell 10 with the insulating film window 11 is S0, and the area of ​​the insulating film window 11 is S1, which satisfies 0.2≤S1 / S0≤0.4. By limiting the size of the insulating film window 11, the bonding strength between the battery cell 10 and the cold plate 30 is improved while ensuring the insulation requirements of the battery cell 10.

[0057] It should be noted that when S1 / S0 is less than 0.2, the size of the insulating film window 11 is too small, and the bonding strength between the battery cell 10 and other adjacent structures is slightly improved, which does not meet the requirements; when S1 / S0 is greater than 0.4, the size of the insulating film window 11 is too large, and the insulation performance of the battery cell 10 is affected, which does not meet the requirements. Therefore, 0.2≤S1 / S0≤0.4 is defined to ensure the insulation requirements of the battery cell 10 while improving the bonding strength between the battery cell 10 and other adjacent structures.

[0058] In one embodiment, the area of ​​the side of the battery cell 10 with the insulating film window 11 is S0, and the area of ​​the glue coating area 21 is S2, which satisfies 0.7≤S2 / S0≤0.8. By limiting the area size of the glue coating area 21, the busbar stress of the battery cell 10 and the side beam stress of the battery pack box 60 are prevented from exceeding the threshold while improving the mode of the battery cell 10.

[0059] It should be noted that the larger the area of ​​the glue-coated region 21 is, the higher the mode of the battery cell 10 is.

[0060] Specifically, as shown in Table 1, the modal capacity, busbar stress and side beam stress of the battery pack body 60 of the battery cells 10 with different areas of the glue coating area 21 are tested.

[0061] Table 1 Test results of modal capacity, busbar stress and edge beam stress

[0062]

[0063] Specifically, in this embodiment, the modal requirement is greater than 45 Hz, the side beam stress of the battery pack body 60 is required to be no more than 32 MPa, and the busbar stress of the battery cell 10 is required to be no more than 20 MPa.

[0064] Please note that Figure 5When the battery module is arranged in the battery pack case 60, the two ends of the cold plate 30 are connected to the front beam and the rear beam of the battery pack case 60 through the transition structure 50, and the front beam and the rear beam are connected to the side beam of the battery pack case 60. The side beam of the battery pack case 60 is subjected to stress. When the stress of the side beam is too large, the overall structural strength of the battery pack will be affected, so the stress of the side beam is limited.

[0065] It should be noted that when the ratio of S2 / S0 increases, the modal capacity of the battery cell 10 will also increase, but at the same time, the busbar stress of the battery cell 10 and the side beam stress of the battery pack box 60 will also change accordingly. Therefore, the ratio of S2 / S0 needs to be limited.

[0066] Specifically, as shown in Table 1, when S2 / S0<0.7, the bus stress of the battery cell 10 exceeds 20Mpa, which does not meet the requirements. When S2 / S0>0.8, the bus stress of the battery cell 10 and the side beam stress of the battery pack case 60 both exceed the corresponding requirements. Therefore, 0.7≤S2 / S0≤0.8 is limited to prevent the bus stress of the battery cell 10 and the side beam stress of the battery pack case 60 from exceeding the threshold while improving the mode of the battery cell 10.

[0067] In one embodiment, Figure 3 As shown, the height of the side surface of the battery cell 10 with the insulating film window 11 is H0, the height of the insulating film window 11 is H1, and the height of the glue coating area 21 is H2, satisfying H1≤H2≤0.84H0.

[0068] It should be noted that the glue-coated area 21 covers the insulating film window 11 , so the height H2 of the glue-coated area 21 should be greater than the height H1 of the insulating film window 11 .

[0069] In one embodiment, the width of the side of the battery cell 10 with the insulating film window 11 is W0, the width of the insulating film window 11 is W1, and the width of the glue coating area 21 is W2, satisfying W1≤W2≤0.81W0.

[0070] Specifically, in this embodiment, S0=H0×W0, S2=H2×W2.

[0071] Specifically, for a battery cell 10 with a height of 102 mm and a width of 52 mm in the longitudinal direction, the height of the glue coating area 21 may be 85 mm, the width of the glue coating area 21 may be 42 mm, and the height of the cold plate 30 may be 96 mm.

[0072] It should be noted that the glue-coated area 21 covers the insulating film window 11 , so the width W2 of the glue-coated area 21 should be greater than the width W1 of the insulating film window 11 .

[0073] Specifically, as shown in Table 2, the modal capacity, busbar stress, and side beam stress of the battery pack box 60 of the battery cells 10 with the same width and different heights of the glue coating area 21 were tested.

[0074] Table 2 Test results of modal capacity, busbar stress and edge beam stress

[0075]

[0076]

[0077] Specifically, the modal requirement is greater than 45 Hz, the side beam stress requirement of the battery pack body 60 is not more than 32 MPa, and the busbar stress requirement of the battery cell 10 is not more than 20 MPa.

[0078] Specifically, as shown in Table 2, when the width of the glue coating area 21 is constant, the higher the height of the glue coating area 21, the larger the area of ​​the glue coating area 21, and the higher the battery mode. However, if the height of the glue coating area 21 continues to increase, the bus stress of the battery cell 10 and the side beam stress of the battery pack body 60 will exceed the threshold.

[0079] Specifically, as shown in Table 3, the modal capacity, busbar stress and side beam stress of the battery pack box 60 of the battery cells 10 with the same height and different widths of the glue coating area 21 were tested.

[0080] Table 3 Test results of modal capacity, busbar stress and edge beam stress

[0081]

[0082] Specifically, as shown in Table 3, when the height of the glue coating area 21 is constant, the wider the width of the glue coating area 21, the larger the area of ​​the glue coating area 21, and the higher the battery mode. However, the continuous increase in the width of the glue coating area 21 will cause the bus stress of the battery cell 10 and the side beam stress of the battery pack body 60 to exceed the threshold value.

[0083] It should be noted that when the area of ​​the glue-coated area 21 is constant, only the width of the glue-coated area 21 is limited to obtain the height dimension of the glue-coated area 21; similarly, when the area of ​​the glue-coated area 21 is constant, only the height of the glue-coated area 21 is limited to obtain the width dimension of the glue-coated area 21.

[0084] In summary, when the area of ​​the glue coating area 21 is certain, the width or height of the glue coating area 21 needs to be limited to prevent the bus stress of the battery cell 10 and the side beam stress of the battery pack body 60 from exceeding the threshold while improving the mode of the battery cell 10.

[0085] According to an embodiment of the present utility model, in a second aspect, a battery pack is also provided, comprising the above-mentioned battery module.

[0086] Specifically, in this embodiment, the battery pack adopts a CTP (Cell To Pack) structure design.

[0087] 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 module, characterized in that: include: A battery cell, wherein a plurality of the battery cells are arranged in a longitudinal direction to form a battery row, and a plurality of the battery rows are arranged in a transverse direction, and an insulating film window is provided on at least one side of the battery cell in the transverse direction; Thermally conductive structural adhesive is applied to the side of the battery core where the insulating film window is opened to form an adhesive coating area, and the adhesive coating area covers the insulating film window; A cold plate is arranged between two columns of battery columns. The cold plate is extended in the longitudinal direction. The side surface of the cold plate is bonded to at least one column of battery columns through the heat conductive structural adhesive.

2. The battery module according to claim 1, characterized in that: The battery module further includes a glue blocking structure, which is disposed between the cold plate and the battery cell, and the glue blocking structure is disposed corresponding to at least one side edge of the glue coating area.

3. The battery module according to claim 2, characterized in that: The width of the glue blocking structure is W3, satisfying 5mm≤W3≤10mm; and / or, Along the height direction of the battery cell, the height of the glue blocking structure is H3, and the height of the side of the battery cell where the insulating film window is opened is H0, satisfying 0.84≤H3 / H0≤0.

9.

4. The battery module according to any one of claims 1 to 3, characterized in that: The cold plate includes a main body and a support part. The upper surface of the support part is connected to the bottom of two adjacent battery columns. The main body is connected to the support part and is located between the two adjacent battery columns. A flow channel is formed inside the main body.

5. The battery module according to any one of claims 1 to 3, characterized in that: The battery module further includes a transfer structure, the transfer structure is connected to the cold plate, the transfer structure is communicated with the flow channel of the cold plate, and the transfer structure is suitable for being connected to a battery pack box.

6. The battery module according to any one of claims 1 to 3, characterized in that: The area of ​​the side of the battery cell where the insulating film window is opened is S0, and the area of ​​the insulating film window is S1, which satisfies 0.2≤S1 / S0≤0.

4.

7. The battery module according to any one of claims 1 to 3, characterized in that: The area of ​​the side of the battery cell where the insulating film window is opened is S0, and the area of ​​the glue-coated area is S2, which satisfies 0.7≤S2 / S0≤0.

8.

8. The battery module according to claim 7, characterized in that: The height of the side of the battery cell with the insulating film window is H0, the height of the insulating film window is H1, and the height of the glue coating area is H2, satisfying H1≤H2≤0.84H0.

9. The battery module according to claim 7, characterized in that: The width of the side of the battery cell with the insulating film window is W0, the width of the insulating film window is W1, and the width of the glue coating area is W2, satisfying W1≤W2≤0.81W0.

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

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