Battery cell module, battery pack and vehicle

Abstract

The invention discloses a battery cell module, a battery pack and a vehicle, the battery cell module comprises a battery cell and a cold plate, the battery cell comprises a pole, the pole comprises a connecting part and a protruding part, the protruding part is located at one end of the connecting part, and a containing groove is defined between the outer wall surface of the protruding part and the outer wall surface of the connecting part; and at least part of the cold plate in the width direction is matched in the accommodating groove and is in heat exchange contact with the surface of the accommodating groove. The battery cell module provided by the invention has the advantages that the heat dissipation effect of the pole is good, the fast charging capacity of the battery cell is high, and the assembly flexibility of the cold plate is good.

Description

Technical Field

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

[0002] As the market share of electric vehicles increases, users' demand for electric vehicle charging speed increases. The main measure to increase the charging speed is high-rate fast charging, which expands the charging rate boundary of the battery cell so that the peak charging current of the entire pack reaches 5C or higher. The increase in charging current will cause the Joule heat generated by the mechanical parts in the battery cell, the busbar in the battery pack and other overcurrent components to increase exponentially.

[0003] In the related art, a cold plate is used to dissipate heat from the top cover of the battery cell with a pole. The cold plate is usually in direct heat exchange contact with the pole, and in order to reduce the space occupied by the liquid cold plate in the height direction of the battery pack, a receiving groove for partially accommodating the cold plate is also provided on the pole. However, the receiving groove in the related art can only be matched with a cold plate that matches its width, and cannot be adapted to a cold plate with a larger width, and the assembly flexibility of the cold plate is poor. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention proposes a battery cell module, which has the advantages of good heat dissipation effect of the pole, high fast charging capability of the battery cell, and good flexibility in cold plate assembly.

[0006] An embodiment of the present invention further provides a battery pack.

[0007] An embodiment of the present invention further provides a vehicle.

[0008] The battery cell module of an embodiment of the present invention includes a battery cell and a cold plate, the battery cell includes a pole, the pole includes a connecting portion and a protrusion, the protrusion is located at one end of the connecting portion, and an accommodating groove is defined between the outer wall surface of the protrusion and the outer wall surface of the connecting portion, and at least a portion of the cold plate in the width direction is fitted in the accommodating groove and is in heat exchange contact with the surface of the accommodating groove.

[0009] According to the battery cell module of the embodiment of the present invention, the pole on the battery cell is provided with a receiving groove. At this time, by fitting at least part of the cold plate in each receiving groove, direct heat exchange contact between the cold plate and the pole on the battery cell is achieved, thereby achieving direct cooling of the pole, the heat dissipation efficiency of the pole is high, the probability of overheating of the battery cell in the area near the pole is low, and the fast charging capability of the battery cell is high. Moreover, the design of the receiving groove makes the volume of the part of the cold plate exposed outside the pole smaller, occupies less space in the battery pack, and has a high space utilization rate of the battery pack.

[0010] At the same time, the number of raised portions is set to one and is located at one end of the connecting portion, so that the defined accommodating groove is substantially an L-shaped groove. At this time, a cold plate of any width can be fitted in the accommodating groove, that is, the accommodating groove can match cold plates of different widths, and there is no need to independently design a cold plate with a width less than or equal to the width of the accommodating groove, and the assembly flexibility of the cold plate is good.

[0011] In some embodiments, the battery core further includes a body, the connecting portion is connected to the body and has a first surface opposite to the body, the protrusion is arranged on the first surface, and the accommodating groove is defined between the outer wall surface of the protrusion and the first surface.

[0012] In some embodiments, the battery cell module further includes a bus bar, wherein the bus bar is connected to the protrusion, and the bus bar is in heat exchange contact with a surface of the cold plate facing away from the first surface.

[0013] In some embodiments, a surface of the protrusion facing away from the first surface is provided with one of a positioning hole and a positioning protrusion, the bus is provided with the other of the positioning hole and the positioning protrusion, and the positioning protrusion is fitted in the positioning hole.

[0014] In some embodiments, the number of the battery cells is multiple, and the multiple battery cells are arranged in an array, and the multiple battery cells form multiple battery cell groups arranged in the column direction of the array, and all the battery cells form at least one pair of pole groups arranged and adjacent in the column direction, and each pole group includes a plurality of poles concentrically arranged in the row direction of the array, and in each pair of pole groups, the opening of the receiving groove on one pole group in the column direction is opposite to the opening of the receiving groove on the other pole group in the column direction;

[0015] The receiving groove extends along the row direction;

[0016] The number of the cold plates is equal to the number of pairs of the pole groups and corresponds one to one. The cold plates are matched in all the receiving slots of a corresponding pair of the pole groups, and any two adjacent cold plates are connected in series.

[0017] In some embodiments, there are at least one pair of battery cells, each pair of battery cells is arranged in the column direction and disposed adjacently, and in each pair of battery cells, an opening of the receiving groove on one of the battery cells in the column direction is opposite to an opening of the receiving groove on the other battery cell in the column direction;

[0018] The number of the cold plates is equal to the number of pairs of the battery cells and corresponds one to one, and the cold plates are fitted in all the receiving slots in a corresponding pair of the battery cells.

[0019] In some embodiments, the body includes a first end face and a second end face opposite to a height direction, the height direction is perpendicular to each of the column direction and the row direction, and the battery cell includes two poles, both of which are arranged on the first end face, or the two poles are respectively arranged on the first end face and the second end face.

[0020] In some embodiments, the two paired pole groups are respectively arranged on different battery cell groups, and the two battery cell groups corresponding to the two paired pole groups are arranged at intervals along the row direction, and the cold plate includes a horizontal portion and a vertical portion, the horizontal portion is fitted in all the receiving grooves of the corresponding pair of pole groups, and the vertical portion is located between the two battery cell groups and is in heat exchange contact with the two battery cell groups.

[0021] In some embodiments, the dimension of the vertical portion in the height direction is d1, where d1 ≥ 5 mm;

[0022] The vertical portion is provided with a collapse cavity.

[0023] In some embodiments, the cold plate includes a harmonica tube, and the harmonica tube is formed with a plurality of single flow channel holes arranged at intervals along the width direction of the harmonica tube, the width of the harmonica tube is b1, the outer wall thickness is t1, the inner rib thickness is t2, the size of the single flow channel hole in the width direction of the harmonica tube is b2, and the size in the thickness direction of the harmonica tube is k1, wherein b1>10mm, t1<3mm, t2<3mm, b2>3mm, k1<3mm.

[0024] In some embodiments, the battery core module further includes a heat-conducting layer coated on the surface of the cold plate, the cold plate is in heat exchange contact with the surface of the receiving slot through the heat-conducting layer, and the heat-conducting layer is at least one of a heat-conducting glue and a heat-conducting pad; wherein,

[0025] The thickness of the heat-conducting layer is d2, wherein d2<2 mm, and / or the heat transfer coefficient of the heat-conducting layer is greater than 0.1 W / mK.

[0026] In some embodiments, an insulating layer is disposed on the outer surface of the cold plate, and the thickness of the insulating layer is d3, wherein 0.1 mm≤d3≤1 mm.

[0027] In some embodiments, the connecting portion and the protruding portion are integrally formed, or the connecting portion and the protruding portion are riveted.

[0028] In some embodiments, the battery cell further includes an explosion-proof valve, and the explosion-proof valve and the pole are respectively arranged on different surfaces of the body.

[0029] A battery pack according to an embodiment of the present invention includes a battery cell module as described in any of the above embodiments.

[0030] The technical advantages of the battery pack according to the embodiment of the present invention are the same as the technical advantages of the battery cell module of the above-mentioned embodiment, which will not be repeated here.

[0031] A vehicle according to an embodiment of the present invention includes a battery pack as described in the above embodiment.

[0032] The technical advantages of the vehicle according to the embodiment of the present invention are the same as the technical advantages of the battery pack in the above-mentioned embodiment, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Schematic diagram of a battery cell in a battery cell module according to an embodiment of the present invention.

[0034] Figure 2 is a schematic diagram of a battery cell module according to an embodiment of the present invention.

[0035] Figure 3 is a cross-sectional view of a battery cell module according to an embodiment of the present invention.

[0036] Figure 4 It is a schematic diagram of an arrangement of multiple battery cells in an array of a battery cell module according to an embodiment of the present invention.

[0037] Figure 5 yes Figure 4 A magnified image of.

[0038] Figure 6 yes Figure 4 Schematic diagram of the battery cell series connection path and cooling channel direction.

[0039] Reference numerals:

[0040] 1. Battery cell; 11. Pole; 111. Raised portion; 112. Connecting portion; 1121. First surface; 114. Accommodating groove; 12. Main body; 121. First end surface; 2. Cold plate; 21. Horizontal portion; 22. Vertical portion; 3. Bus; 4. Heat conducting layer; X, column direction; Y, row direction; Z, height direction. DETAILED DESCRIPTION

[0041] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0042] The applicant found that in previous power battery products, the temperature of the battery cells at low-rate charging (<3C) was relatively low, and the temperature rise of current-carrying components such as poles and busbars was not high, so there was no need for particularly high-intensity cooling of the battery. Therefore, pole cooling is not necessary, and conventional thermal management solutions of general strength such as bottom cooling can meet the cooling needs of the battery cells. However, under the demand for ultra-high-speed charging of electric vehicles (such as charging 500km in 10 minutes, 5C to 6C), the temperature rise of current-carrying components such as busbars is obvious, and the uneven temperature distribution is more obvious. Therefore, a solution for direct cooling of current-carrying components such as busbars is required, namely pole cooling.

[0043] The pole cooling scheme for hollow poles designed by the applicant to address the above defects is the result of close cooperation among multiple disciplines. The scheme involves many parts, including: battery cells, busbars, cold plates and thermal conductive adhesives. The involved disciplines include battery cells, PACK systems, general layout, thermal management, PACK processes, etc.; the application difficulties that need to be noted are: whole package insulation, battery cell flatness, thermal management efficiency, grouping methods, etc. Therefore, the birth of this scheme requires the demand for high-rate fast charging and close cooperation among various disciplines to conceive such a thermal management scheme with high cooling intensity and high space utilization.

[0044] Specifically, the following Figure 1-Figure 6 A battery cell module according to an embodiment of the present invention is described.

[0045] The battery cell module of the embodiment of the present invention includes a battery cell 1 and a cold plate 2, the battery cell 1 includes a pole 11, the pole 11 includes a connecting portion 112 and a protrusion 111, the protrusion 111 is located at one end of the connecting portion 112, and an accommodating groove 114 is defined between the outer wall surface of the protrusion 111 and the outer wall surface of the connecting portion 112, and at least a portion of the cold plate 2 in the width direction is fitted in the accommodating groove 114 and is in heat exchange contact with the surface of the accommodating groove 114.

[0046] According to the battery cell module of the embodiment of the present invention, the pole 11 on the battery cell 1 is provided with a receiving groove 114. At this time, by fitting at least part of the cold plate 2 in each receiving groove 114, direct heat exchange contact between the cold plate 2 and the pole 11 on the battery cell 1 is achieved, thereby achieving direct cooling of the pole 11, the heat dissipation efficiency of the pole 11 is high, the probability of overheating of the battery cell 1 in the area near the pole 11 is low, and the fast charging capability of the battery cell 1 is high. Moreover, the design of the receiving groove 114 makes the volume of the part of the cold plate 2 exposed outside the pole 11 smaller, occupies less space in the battery pack, and has a high space utilization rate of the battery pack.

[0047] At the same time, the number of raised portions 111 is set to one and is located at one end of the connecting portion 112, so that the defined receiving groove 114 is substantially an L-shaped groove. At this time, any width of the cold plate 2 can be fitted into the receiving groove 114, that is, the receiving groove 114 can match the cold plates 2 of different widths, and there is no need to independently design a cold plate 2 with a width less than or equal to the width of the receiving groove 114, and the assembly flexibility of the cold plate 2 is good.

[0048] It should be noted that Figure 1 As shown, when the cross-sectional outer contour of the pole 11 is rectangular, the cross section is a surface parallel to the first surface 1121. The protrusion 111 is preferably arranged at one end of the connecting portion 112 in the width direction, and the cross-sectional area of ​​the protrusion 111 is substantially equal to half of the cross-sectional area of ​​the connecting portion 112.

[0049] In some embodiments, the battery cell 1 also includes a body 12 , the connecting portion 112 is connected to the body 12 and has a first surface 1121 opposite to the body 12 , the protrusion 111 is arranged on the first surface 1121 , and an accommodating groove 114 is defined between the outer wall surface of the protrusion 111 and the first surface 1121 .

[0050] Taking the example that the connection portion 112 is disposed above the body 12, the protrusion 111 extends along the height direction Z of the body 12, and the receiving groove 114 defined between the outer wall surface of the protrusion 111 and the first surface 1121 has at least an upward opening. When multiple battery cells 1 are arranged in an array, the cold plate 2 is convenient to fit in the receiving groove 114 through the upper end opening, and the cold plate 2 and the battery cell 1 are convenient to assemble. Or taking the example that the body 12 is a rectangular parallelepiped and the pole 11 is located on the side wall in the width direction of the body 12, the receiving groove 114 formed at this time is also opened in the direction away from the rectangular parallelepiped, and the cold plate 2 is convenient to fit in the receiving groove 114 through the opening, and the cold plate 2 and the battery cell 1 are convenient to assemble.

[0051] Specifically, Figure 1 As shown, the area of ​​the first surface 1121 is larger than the cross-sectional area of ​​the protrusion 111, and the cross-sectional area is parallel to the first surface 1121. The body 12 includes a shell, a winding core installed in the shell, and a top cover connected to the upper end opening of the shell. The connecting portion 112 of the pole 11 is arranged on the top cover and welded to the pole lug on the winding core. When the battery cell 1 is charged and discharged, the mechanical parts near the pole lug of the winding core generate a large amount of heat, which is transferred to the cold plate 2 through the pole 11 to achieve rapid cooling of the area.

[0052] Alternatively, the receiving groove 114 can also be provided on the side wall surface of the pole 11, that is, the receiving groove 114 is a U-shaped groove that is only opened on the side wall surface of the pole 11. In this case, the end surface of the pole 11 is not provided with an opening, so as to ensure that it has a sufficiently large welding area and current carrying capacity with the busbar 3. For example, the protrusion 111 and the connecting portion 112 are arranged in a direction perpendicular to the height direction of the battery cell 1, and the protrusion 111 is spaced apart from the first end surface 121 of the body 12, and the surface of the protrusion 111 facing the first end surface 121, the first end surface 121, and the side wall surface of the connecting portion 112 jointly define the receiving groove 114.

[0053] It should be noted that the body 12 of the battery cell 1 can be in a rectangular parallelepiped shape or a cylindrical shape.

[0054] In some embodiments, Figure 2 and Figure 3 As shown, the battery module further includes a bus bar 3 , which is connected to the protrusion 111 , and the bus bar 3 is in heat exchange contact with a surface of the cold plate 2 that is away from the first surface 1121 .

[0055] That is, the cold plate 2 also realizes direct cooling of the bus 3, so that the heat generated by the mechanical parts such as the pole ears of the winding core in the battery cell 1 can be quickly taken away through the pole 11 and the bus 3, further avoiding local overheating of the battery cell module and causing the power of the battery cell 1 to be limited, and the fast charging capability of the battery cell 1 is higher.

[0056] Specifically, the cold plate 2 is located between the connecting portion 112 of the pole 11 and the bus 3. While the cold plate 2 is in direct contact with the pole 11 and the bus 3, it also substantially does not affect the electrical connection between the raised portion 111 of the pole 11 and the bus 3. At this time, the cold plate 2 is substantially completely hidden in the receiving groove 114 in the height direction Z. The cold plate 2 occupies less space in the height direction Z of the battery pack, and the height space utilization rate of the battery pack is higher.

[0057] For example, Figure 2 and Figure 3 As shown, the receiving groove 114 is an L-shaped groove, a part of the busbar 3 is located above the pole 11 and welded to the protrusion 111, and another part of the busbar 3 is located above the pole 11 of the adjacent battery cell 1 and welded to the protrusion 111, thereby realizing the series connection of two adjacent battery cells 1. The busbar 3 spans the two L-shaped grooves of the two poles 11 connected thereto.

[0058] In some embodiments, a surface of the protrusion 111 facing away from the first surface 1121 is provided with one of a positioning hole and a positioning protrusion, and the bus bar 3 is provided with the other of the positioning hole and the positioning protrusion, and the positioning protrusion fits in the positioning hole.

[0059] Through the plug-in cooperation of the positioning protrusion and the positioning hole, the busbar 3 and the protrusion 111 are connected simply and accurately, and the connection between the busbar 3 and the protrusion 111 is convenient and reliable.

[0060] For example, a positioning protrusion is provided on the upper surface of the protrusion 111 , and a positioning hole is provided on the busbar 3 .

[0061] In some embodiments, there are multiple battery cells 1, and the multiple battery cells 1 are arranged in an array. The multiple battery cells 1 form multiple battery cell groups arranged along the column direction X of the array. All battery cells 1 form at least one pair of pole groups arranged and adjacent in the column direction X. Each pole group includes multiple poles 11 concentrically arranged along the row direction Y of the array. In each pair of pole groups, the opening of the receiving slot 114 on one pole group in the column direction X is opposite to the opening of the receiving slot 114 on the other pole group in the column direction X. The receiving slot 114 extends along the row direction Y. The number of cold plates 2 is equal to the number of pairs of pole groups and corresponds one to one. The cold plates 2 are matched in all the receiving slots 114 of the corresponding pair of pole groups, and any two adjacent cold plates 2 are connected in series.

[0062] That is, the two pole groups of each pair of pole groups are arranged in mirror symmetry, the receiving slots 114 on one pole group are arranged in the column direction X and are arranged oppositely and adjacently with the receiving slots 114 on the other pole group, and all the receiving slots 114 in each pair of pole groups jointly define a second heat dissipation channel with a U-shaped cross section extending in the row direction Y, and the cold plate 2 is fitted in the second heat dissipation channel to achieve heat exchange contact with all poles 11 in each pair of pole groups. In this case, the number of cold plates 2 required is less, and the assembly efficiency of the battery module is higher.

[0063] It should be noted that the above-mentioned row direction Y only refers to the extension direction of the receiving groove 114, and does not specifically refer to a certain direction of the battery cell 1. For example, the battery cell 1 is a rectangular parallelepiped. Figure 2 , Figure 3 and Figure 5 As shown, when the extension direction of the receiving groove 114 is consistent with the length direction of the battery cell 1, the row direction Y is the length direction of the battery cell 1, and the column direction X is the width direction of the battery cell 1. Similarly, when the extension direction of the receiving groove 114 is consistent with the width direction of the battery cell 1, the row direction Y is the width direction of the battery cell 1, and the column direction X is the length direction of the battery cell 1.

[0064] In some embodiments, Figure 2As shown, there is at least one pair of battery cells 1, and each pair of battery cells 1 is arranged in the column direction X and adjacent to each other. In each pair of battery cells 1, the opening of the receiving groove 114 on one battery cell 1 in the column direction X is opposite to the opening of the receiving groove 114 on the other battery cell 1 in the column direction X. The number of cold plates 2 is equal to the number of pairs of battery cells 1 and corresponds one to one, and the cold plates 2 are matched in all the receiving grooves 114 in the corresponding pair of battery cells 1. At this time, the number of cold plates 2 is at least half of the number of battery cells 1, so that a smaller number of cold plates 2 can achieve cooling of all poles 11, and the assembly efficiency of the cold plates 2 is high.

[0065] Specifically, Figure 2 As shown, there are two pairs of battery cells 1 , and four battery cells 1 are arranged along a column direction X, and the four battery cells 1 correspond to two cold plates 2 .

[0066] In some embodiments, the body 12 includes a first end face 131 and a second end face opposite to the height direction Z, the height direction Z is perpendicular to each of the column direction X and the row direction Y, and the battery cell 1 includes two poles 11, both of which are arranged on the first end face 131, or the two poles 11 are respectively arranged on the first end face 131 and the second end face.

[0067] For example, Figure 1 As shown, the battery cell 1 includes two poles 11, both of which are arranged on the first end surface 131 and arranged at intervals along the row direction Y, and each battery cell group forms a pole group. The receiving grooves 114 on the two poles 11 on the battery cell 1 are L-shaped grooves, and multiple battery cell groups form multiple pairs of pole groups, and the number of pairs of pole groups is half the number of battery cell groups. In each pair of pole groups, the openings of all the receiving grooves 114 on one pole group in the column direction X are opposite to the openings of all the receiving grooves 114 on the other pole group in the column direction X. At this time, each pair of pole groups, or every two battery cell groups, corresponds to a cold plate 2, and the cold plate 2 is matched in all the receiving grooves 114 in the corresponding pair of pole groups to simultaneously achieve heat dissipation of all poles 11 on the two battery cell groups. Among them, the battery cell 1 is a rectangular parallelepiped, the column direction X of the battery cell 1 is the width direction of the battery cell 1, and the row direction Y is the length direction of the battery cell 1.

[0068] For example, the battery cell 1 includes two poles 11, both of which are arranged on the first end surface 131 and arranged at intervals along the column direction X, and each battery cell group forms two pole groups, and the receiving grooves 114 on the two poles 11 on the battery cell 1 are L-shaped grooves, and the opening of one receiving groove 114 in the column direction X is opposite to the opening of the other receiving groove 114 in the column direction X. Each battery cell group corresponds to a cold plate 2, and a cold plate 2 is simultaneously matched in the two receiving grooves 114 on the same battery cell 1 to heat exchange contact with the two poles 11 on the same battery cell 1. Among them, the battery cell 1 is a rectangular parallelepiped, the column direction X of the battery cell 1 is the length direction of the battery cell 1, and the row direction Y is the width direction of the battery cell 1.

[0069] For example, Figure 4-Figure 6 As shown, the multiple battery cells arranged in the array also form multiple battery cell rows arranged along the row direction Y (the arrangement direction of the battery cells in the battery cell row is perpendicular to the arrangement direction of the battery cells in the battery cell group), multiple battery cells 1 in the same battery cell row are connected in series through the bus 3, multiple battery cell rows are connected in series through the bus 3, and multiple cold plates 2 are connected in series along the arrangement direction of the multiple battery cells 1 in the battery cell row.

[0070] It should be noted that the battery cell 1 can also be cylindrical, and the height direction of the battery cell 1 is consistent with the axial direction of the battery cell 1. In this case, the column direction X and the row direction Y of the battery cell 1 are both radial directions of the battery cell 1. When multiple battery cells 1 are arranged in an array, it is only necessary to ensure that all the receiving slots 114 in each pole group in the corresponding battery cell group are concentrically arranged along their extension direction. Among them, the concentric arrangement refers to the center line of the receiving slot 114 along its extension direction being collinear with the center lines of other receiving slots 114 in the same pole group.

[0071] In some embodiments, Figure 3 and Figure 4 As shown, two paired pole groups are respectively arranged on different battery cell groups, and two battery cell groups corresponding to the two paired pole groups are arranged at intervals along the row direction Y. The cold plate 2 includes a horizontal portion 21 and a vertical portion 22. The horizontal portion 21 is matched in all the receiving slots 114 of the corresponding pair of pole groups, and the vertical portion 22 is located between the two battery cell groups and is in heat exchange contact with the two battery cell groups.

[0072] That is, the cold plate 2 is also in heat exchange contact with the large surfaces (surfaces opposite to the row direction Y) of all the battery cells 1 in the two battery cell groups through the vertical portion 22, thereby further increasing the heat exchange area between the cold plate 2 and the battery cells 1, and further increasing the heat dissipation efficiency of the cold plate 2 to the battery cells 1.

[0073] Specifically, the height of the vertical portion 22 between the two battery cell groups in the cold plate 2 is less than or equal to the height of the battery cell 1 , and the portion can be in heat exchange contact with the battery cell 1 through a thermally conductive adhesive or a thermally conductive pad.

[0074] In some embodiments, the dimension of the vertical portion 22 in the height direction Z is d1, wherein d1 ≥ 5 mm. The vertical portion 22 is provided with a collapse cavity.

[0075] That is, when the height of the vertical portion 22 located between the two battery cell groups in the cold plate 2 exceeds 5 mm, a collapse cavity is provided inside the vertical portion 22 to ensure that the collapse cavity can be crushed when the battery cell 1 expands, so that the vertical portion is compressed and deformed synchronously, thereby avoiding the vertical portion affecting the expansion of the battery cell 1 and causing a reduction in the service life and safety of the battery cell 1.

[0076] In some embodiments, the cold plate 2 includes a harmonica tube, which is formed with a plurality of single flow channel holes arranged at intervals along the width direction of the harmonica tube, the width of the harmonica tube is b1, the outer wall thickness is t1, the inner rib thickness is t2, the size of the single flow channel hole in the width direction of the harmonica tube is b2, and the size in the thickness direction of the harmonica tube is k1, wherein b1>10mm, t1<3mm, t2<3mm, b2>3mm, and k1<3mm.

[0077] The size design of t1 ensures that the cold plate 2 has a lower thermal resistance to improve the heat dissipation efficiency of the pole 11. The size design of b1, t2, b2 and k1 ensures that the total cross-sectional area of ​​the single hole of the flow channel formed by the harmonica tube is large enough, and thus has a large enough flow rate to further improve the heat dissipation efficiency of the pole 11.

[0078] Specifically, b1 can be 11mm, 15mm and 20mm, t1, t2 and k1 can be 2mm, 2.5mm and 2.9mm, b2 can be 3.1mm, 3.5mm and 4mm, etc. The dimensions b2 and k1 of the single hole of the flow channel correspond to the other dimensions b1, t1 and t2 of the harmonica tube. For example, on the basis of a certain size of b1, in order to have a larger flow rate, that is, in order to make the dimensions b2 and k1 of the single hole of the flow channel larger, t1 and t2 are set to 2mm, so that b2 and k1 are 4mm and 2.9mm respectively. Alternatively, t1 and t2 can also be set to 2.9mm, so that b2 and k1 are 3.1mm and 2mm respectively.

[0079] In some embodiments, Figure 3 As shown, the battery module further includes a heat-conducting layer 4 coated on the surface of the cold plate 2. The cold plate 2 is in heat exchange contact with the surface of the receiving groove 114 through the heat-conducting layer 4. The heat-conducting layer 4 is at least one of a heat-conducting glue and a heat-conducting pad.

[0080] Using at least one of thermally conductive glue and thermally conductive pad as the thermally conductive layer 4 can achieve a close fit between the cold plate 2 and the thermally conductive layer 4, and a close fit between the surface of the receiving groove 114 and the thermally conductive layer 4, thereby making the heat exchange area between the cold plate 2 and the surface of the receiving groove 114 larger, and the heat dissipation efficiency of the cold plate 2 to the pole 11 is higher.

[0081] It should be noted that the thermal conductive layer 4 separates the cold plate 2 from the surface of the receiving groove 114, and the thermal conductive layer 4 is also coated on the upper surface of the cold plate 2, so that the upper surface of the cold plate 2 is in heat exchange contact with the bus 3 through the thermal conductive layer 4, thereby improving the heat dissipation efficiency of the cold plate 2 to the bus 3.

[0082] The thickness of the heat conducting layer 4 is d2, wherein d2 is less than 2 mm, and / or the heat transfer coefficient of the heat conducting layer 4 is greater than 0.1 W / mK, thereby effectively reducing the thermal resistance of the heat conducting layer 4 and effectively improving the heat dissipation efficiency of the cold plate 2 to the poles 11 and the busbars 3.

[0083] Specifically, the thickness d2 of the heat conducting layer 4 is less than 1 mm.

[0084] In some embodiments, the heat transfer coefficient of the heat conducting layer 4 is greater than 0.1 W / mK, thereby further reducing the thermal resistance of the heat conducting layer 4 and further improving the heat dissipation efficiency of the cold plate 2 to the poles 11 and the busbars 3 .

[0085] Specifically, the heat transfer coefficient of the heat conducting layer 4 is greater than 1 W / mK.

[0086] In some embodiments, an insulating layer is provided on the outer surface of the cold plate 2 to effectively prevent the cold plate 2 from being in conductive contact with the pole 11 and causing a short circuit in the battery cell 1. Specifically, the thickness of the insulating layer is between 0.1 mm and 1 mm.

[0087] Illustratively, the thickness of the insulating layer is 0.1 mm, 0.4 mm, 0.7 mm or 1 mm.

[0088] In some embodiments, the connection portion 112 and the protrusion 111 are integrally formed, thereby facilitating the forming of the pole 11 and providing high positional accuracy between the connection portion 112 and the protrusion 111 .

[0089] Alternatively, the connection portion 112 is riveted to the protruding portion 111 , thereby ensuring the connection strength between the connection portion 112 and the protruding portion 111 , and facilitating the processing of the protruding portion 111 in a specific shape, and facilitating the forming of the receiving groove 114 matching the cold plate 2 .

[0090] In some embodiments, the battery cell 1 further includes an explosion-proof valve, and the explosion-proof valve and the pole 11 are respectively arranged on different surfaces of the body 12. As a result, the pole 11 of the first end surface 131 has a larger design area, so that the protrusion 111 and the bus bar 3 have better welding reliability and current capacity, and the surface area of ​​the receiving groove 114 is large enough, and the heat exchange efficiency between the cold plate 2 is higher.

[0091] For example, the two poles 11 on the battery cell 1 are both arranged on the first end surface 131, and the explosion-proof valve is arranged on the second end surface of the battery cell 1. Therefore, when multiple battery cells 1 are arranged in an array, the explosion-proof valve will not be blocked by the remaining battery cells 1, which facilitates the normal opening of the explosion-proof valve.

[0092] For example, the two poles 11 on the battery cell 1 are respectively arranged on the first end face 131 and the second end face, and the explosion-proof valve is arranged on the side wall surface of the battery cell 1, specifically on the small surface of the side wall surface (the surface where the wide side and the high side are located), thereby not affecting the adjacent battery cells 1 arranged through the large surface to form a battery cell group, and the adjacent battery cell groups can also be arranged at intervals to form a smoke channel connected to the explosion-proof valve between the two adjacent battery cell groups.

[0093] In some embodiments, the distance between the two opposite side surfaces of the portion of the connecting portion 112 protruding from the first surface 1121 along the depth direction of the receiving groove 114 is H1, and the depth of the receiving groove 114 is H2, wherein 0≤H1≤3mm, 0≤H2≤8mm. Among them, by setting H1 not more than 3mm, on the basis of ensuring the overall structural strength of the pole 11, the receiving groove 114 can be designed to be deep enough to ensure that the surface area of ​​the receiving groove 114 is larger, thereby making the heat exchange area between the cold plate 2 and the pole 11 larger and the heat exchange efficiency higher. By setting H2 not more than 8mm, it is effectively avoided that the height of the protruding portion 111 is too large to cause low bending strength.

[0094] Specifically, the height of the connection portion 112 can be 1 mm, 2 mm, and 3 mm, and the depth of the receiving groove 114 can be 2 mm, 4 mm, 6 mm, and 8 mm. For example, the height of the connection portion 112 is inversely proportional to the depth of the receiving groove 114. When the height of the connection portion 112 is 1 mm, the depth of the receiving groove 114 is set to 8 mm. When the height of the connection portion 112 is 3 mm, the depth of the receiving groove 114 is set to 4 mm or 6 mm.

[0095] And / or, the distance between two opposite side surfaces of the protrusion 111 along a direction perpendicular to the extending direction of the receiving groove 114 is L2, wherein 4 mm≤L2≤30 mm.

[0096] That is, the width of the protrusion 111 is not less than 4 mm to ensure that the protrusion 111 has sufficient anti-bending strength.

[0097] Meanwhile, the width of the protrusion 111 is not greater than 30 mm, so as to ensure that the width of the receiving groove 114 is large enough, thereby ensuring that the heat exchange area between the cold plate 2 and the pole 11 is large enough, and the heat exchange efficiency of the pole 11 is higher.

[0098] It should be noted that, taking the cross-sectional outer contour of the pole 11 as a rectangle, the two poles 11 are both arranged on the first end face 131, and the cross-sectional outer contour of the shell 15 of the battery cell 1 is a rectangle as an example, in order to ensure that the battery cell 1 has sufficient strength, heat dissipation efficiency and fast charging effect, the following parameters are also set: the width of the battery cell 1 is L0, the thickness of the battery cell 1 is W0, the minimum distance between the pole 11 and the edge of the shell 15 in the length direction is L1, the minimum distance from the pole 11 to the edge of the shell 15 in the width direction is W1, and the distance between the two poles 11 is L3, among which 145mm≤L0≤350mm, 20mm≤W0≤65mm, 4mm≤L1≤30mm, 4mm≤W1≤15mm, and 10mm≤L3≤40mm.

[0099] In some embodiments, the cross-sectional area of ​​the protrusion 111 is S1, and the area of ​​the first surface 1121 is S2, wherein 10%<S1 / S2<70%. The cross-sectional area is parallel to the first surface 1121.

[0100] By setting S1 / S2 to be greater than 10%, it is ensured that the protrusion 111 and the busbar 3 have a sufficiently large contact area to ensure the welding reliability and current carrying capacity between the protrusion 111 and the busbar 3. By setting S1 / S2 to be less than 70%, it is ensured that the surface of the receiving groove 114 defined between the protrusion 111 and the connecting portion 112 has a sufficiently large area to facilitate matching with a cold plate 2 of a sufficiently large size, thereby ensuring that the cold plate 2 has good heat dissipation efficiency for the pole 11.

[0101] For example, the ratio of S1 to S2 may be 11%, 20%, 40%, 60% and 69%.

[0102] A battery pack according to an embodiment of the present invention includes a battery cell module as described in any of the above embodiments.

[0103] The technical advantages of the battery pack according to the embodiment of the present invention are the same as the technical advantages of the battery cell module of the above-mentioned embodiment, which will not be repeated here.

[0104] A vehicle according to an embodiment of the present invention includes a battery pack as described in the above embodiment.

[0105] The technical advantages of the vehicle according to the embodiment of the present invention are the same as the technical advantages of the battery pack in the above-mentioned embodiment, which will not be repeated here.

[0106] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0107] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0108] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0109] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0110] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0111] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A battery cell module, characterized in that: include: A battery cell, the battery cell comprising a pole, the pole comprising a connecting portion and a protruding portion, the protruding portion being located at one end of the connecting portion, and an accommodating groove being defined between an outer wall surface of the protruding portion and an outer wall surface of the connecting portion; A cold plate, at least a portion of the cold plate in a width direction is fitted in the receiving groove and is in heat exchange contact with a surface of the receiving groove.

2. The battery cell module according to claim 1, characterized in that: The battery core further includes a body, the connecting portion is connected to the body and has a first surface opposite to the body, the protrusion is arranged on the first surface, and the accommodating groove is defined between the outer wall surface of the protrusion and the first surface.

3. The battery cell module according to claim 2, characterized in that: The battery cell module further includes a bus bar connected to the protrusion, and the bus bar is in heat exchange contact with a surface of the cold plate facing away from the first surface.

4. The battery cell module according to claim 3, characterized in that: A surface of the protrusion facing away from the first surface is provided with one of a positioning hole and a positioning protrusion, and the busbar is provided with the other of the positioning hole and the positioning protrusion, and the positioning protrusion is fitted in the positioning hole.

5. The battery cell module according to claim 2, characterized in that: The number of the battery cells is multiple, and the multiple battery cells are arranged in an array, and the multiple battery cells form multiple battery cell groups arranged in the column direction of the array, and all the battery cells form at least one pair of pole groups arranged in the column direction and adjacent to each other, and each pole group includes multiple poles concentrically arranged in the row direction of the array, and in each pair of pole groups, the opening of the receiving groove on one pole group in the column direction is opposite to the opening of the receiving groove on the other pole group in the column direction; The receiving groove extends along the row direction; The number of the cold plates is equal to the number of pairs of the pole groups and corresponds one to one. The cold plates are matched in all the receiving slots of a corresponding pair of the pole groups, and any two adjacent cold plates are connected in series.

6. The battery cell module according to claim 1, characterized in that: There is at least one pair of the battery cells, each pair of the battery cells is arranged in a column direction and disposed adjacent to each other, and in each pair of the battery cells, an opening of the receiving groove on one of the battery cells in the column direction is opposite to an opening of the receiving groove on the other battery cell in the column direction; The number of the cold plates is equal to the number of pairs of the battery cells and corresponds one to one, and the cold plates are fitted in all the receiving slots in a corresponding pair of the battery cells.

7. The battery cell module according to claim 5, characterized in that: The body includes a first end face and a second end face opposite to a height direction, wherein the height direction is perpendicular to each of the column direction and the row direction, and the battery cell includes two poles, both of which are arranged on the first end face, or the two poles are respectively arranged on the first end face and the second end face.

8. The battery cell module according to claim 5, characterized in that: The two paired pole groups are respectively arranged on different battery cell groups, and the two battery cell groups corresponding to the two paired pole groups are arranged at intervals along the row direction. The cold plate includes a horizontal portion and a vertical portion. The horizontal portion is matched in all the accommodating grooves of the corresponding pair of pole groups, and the vertical portion is located between the two battery cell groups and is in heat exchange contact with the two battery cell groups.

9. The battery cell module according to claim 8, characterized in that: The dimension of the vertical portion in the height direction is d1, wherein d1 ≥ 5 mm; The vertical portion is provided with a collapse cavity.

10. The battery cell module according to claim 1, characterized in that: The cold plate includes a harmonica tube, and the harmonica tube is formed with a plurality of single flow channel holes arranged at intervals along the width direction of the harmonica tube. The width of the harmonica tube is b1, the outer wall thickness is t1, the inner rib thickness is t2, the size of the single flow channel hole in the width direction of the harmonica tube is b2, and the size of the single flow channel hole in the thickness direction of the harmonica tube is k1, wherein b1>10mm, t1<3mm, t2<3mm, b2>3mm, and k1<3mm.

11. The battery cell module according to claim 1, characterized in that: The battery module further includes a heat-conducting layer coated on the surface of the cold plate, the cold plate is in heat exchange contact with the surface of the receiving slot through the heat-conducting layer, and the heat-conducting layer is at least one of a heat-conducting glue and a heat-conducting pad; wherein, The thickness of the heat-conducting layer is d2, wherein d2<2 mm, and / or the heat transfer coefficient of the heat-conducting layer is greater than 0.1 W / mK.

12. The battery cell module according to claim 1, characterized in that: An insulating layer is disposed on the outer surface of the cold plate, and the thickness of the insulating layer is d3, wherein 0.1 mm≤d3≤1 mm.

13. The battery cell module according to claim 1, characterized in that: The connecting portion and the protruding portion are integrally formed, or the connecting portion and the protruding portion are riveted.

14. The battery cell module according to claim 2, characterized in that: The battery core further includes an explosion-proof valve, and the explosion-proof valve and the pole are respectively arranged on different surfaces of the body.

15. A battery pack, characterized in that: Comprising a battery cell module as described in any one of claims 1-14.

16. A vehicle, characterized in that: Comprising the battery pack as claimed in claim 15.

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