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 convex part, the connecting part and the convex part are riveted, a containing groove is defined between the outer wall surface of the convex part and the outer wall surface of the connecting part, and the cold plate is arranged in the containing groove. And at least part of the cold plate 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 space utilization rate of the battery pack is high, the shape design of the accommodating groove is flexible, and the manufacturing cost of the accommodating groove is low.

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 technology, a cold plate is used to dissipate heat from the top cover of the battery cell with the 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 is usually formed directly when the pole is integrally formed, or the receiving groove is formed on the pole after the pole is formed, but the above two methods can usually only form a relatively simple receiving groove. When a more complex receiving groove needs to be formed, the precision requirements of the equipment and process required to make the receiving groove will be greatly increased, resulting in high production costs of the receiving groove. 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 provides a battery cell module, which has the advantages of good heat dissipation effect of the pole and high space utilization of the battery pack, as well as flexible shape design of the receiving groove and low manufacturing cost of the receiving groove.

[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 the 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 protruding portion, the connecting portion and the protruding portion are riveted, and a receiving groove is defined between the outer wall surface of the protruding portion and the outer wall surface of the connecting portion; at least a portion of the cold plate is fitted in the receiving groove and is in heat exchange contact with the surface of the receiving groove.

[0009] According to the battery cell module of the embodiment of the present invention, a receiving groove is defined between the outer wall surface of the raised part of the pole and the outer wall surface of the connecting part. At this time, by fitting at least part of the cold plate in the 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] In addition, the protrusion and the connecting portion are riveted, which means that the shapes of the protrusion and the connecting portion can be designed independently without affecting each other. In this case, the shape design of the protrusion and the connecting portion is more flexible and the design cost is lower. As a result, a more complex receiving groove can be defined between the outer wall surface of the protrusion and the outer wall surface of the connecting portion. The production cost of the receiving groove is lower and it can better meet the matching requirements with cold plates of different sizes.

[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 number of the protrusions is two, the two protrusions are arranged at intervals, and the outer wall surfaces opposite to each other of the two protrusions and the first surface jointly define the accommodating groove.

[0013] In some embodiments, the number of the protrusion is one, the protrusion is located at one end of the connecting portion, and the outer wall surface of the protrusion and the first surface define the accommodating groove.

[0014] 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.

[0015] In some embodiments, the distance between two opposite side surfaces of the portion of the connecting portion protruding from the first surface along the depth direction of the receiving groove is H1, and the depth of the receiving groove is H2, wherein 0≤H1≤3mm, 0≤H2≤8mm;

[0016] And / or, a distance between two opposite side surfaces of the protrusion along a direction perpendicular to the extending direction of the accommodating groove is L2, wherein 4mm≤L2≤30mm.

[0017] In some embodiments, the total cross-sectional area of ​​the protrusion is S1, and the area of ​​the first surface is S2, wherein 10%<S1 / S2<70%.

[0018] 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.

[0019] In some embodiments, a surface of each of the protrusions 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.

[0020] 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 along the column direction of the array, and all the battery cell groups form multiple pole groups, and each pole group includes multiple poles concentrically arranged along the row direction of the array;

[0021] The receiving groove extends along the row direction;

[0022] The number of the cold plates is equal to and corresponds to the number of the pole groups. The cold plates are matched in all the receiving slots of the corresponding pole groups, and any two adjacent cold plates are connected in series.

[0023] 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;

[0024] The receiving groove extends along the row direction;

[0025] 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.

[0026] 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.

[0027] A battery pack according to an embodiment of the present invention includes a battery cell module as described in any of the above embodiments.

[0028] 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.

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

[0030] 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

[0031] Figure 1 Schematic diagram of a battery cell in a battery cell module according to an embodiment of the present invention.

[0032] Figure 2 is an exploded diagram of a battery cell in a battery cell module according to an embodiment of the present invention.

[0033] Figure 3 4 is a front view of a battery cell in a battery cell module according to an embodiment of the present invention.

[0034] Figure 4 4 is a top view of a battery cell in a battery cell module according to an embodiment of the present invention.

[0035] Figure 5 is a schematic diagram of a battery cell module according to an embodiment of the present invention.

[0036] Figure 6 is an exploded view of a battery cell module according to an embodiment of the present invention.

[0037] Figure 7 is another exploded view of a battery cell module according to an embodiment of the present invention.

[0038] Figure 8 is another schematic diagram of a battery cell in a battery cell module according to an embodiment of the present invention.

[0039] Fig. 9 is another schematic diagram of a battery cell in a battery cell module according to an embodiment of the present invention.

[0040] Fig.10 is another schematic diagram of a battery cell module according to an embodiment of the present invention.

[0041] Fig.11 is another top view of a battery cell in a battery cell module according to an embodiment of the present invention.

[0042] Fig.12 is another schematic diagram of a battery cell module according to an embodiment of the present invention.

[0043] Fig.13 FIG. 1 is a top view of a cell of a cell module according to an embodiment of the present invention. Figure 1 .

[0044] Fig.14 FIG. 1 is a top view of a cell of a cell module according to an embodiment of the present invention. Figure 2 .

[0045] Fig.15 FIG. 1 is a top view of a cell of a cell module according to an embodiment of the present invention. Figure 3 .

[0046] Fig.16 is another schematic diagram of a battery cell of a battery cell module according to an embodiment of the present invention.

[0047] Fig.17 Schematic diagram of a cell group of a cell module according to an embodiment of the present invention.

[0048] Fig.18 Schematic diagram of a cell group and a busbar of a cell module according to an embodiment of the present invention.

[0049] Fig.19 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.

[0050] Fig. 20 yes Fig.19 A is an enlarged view of the

[0051] Fig.21 yes Fig.19 Schematic diagram of the battery cell series connection path and cooling channel direction.

[0052] Fig. 22 is another 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.

[0053] Fig.23 yes Fig. 22 Schematic diagram of the battery cell series connection path and cooling channel direction.

[0054] Fig.24 This is another 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.

[0055] Fig.25 yes Fig.24 Schematic diagram of the battery cell series connection path and cooling channel direction.

[0056] Fig.26 is a cross-sectional view of a battery cell module according to an embodiment of the present invention.

[0057] Reference numerals:

[0058] 1. Battery cell; 11. Pole; 111. Raised portion; 1111. Positioning raised portion; 1112. First side surface; 1113. Second side surface; 112. Connecting portion; 1121. First surface; 114. Receiving groove; 13. Top cover; 131. First end surface; 14. Winding core; 15. Shell; 2. Cold plate; 3. Bus bar; 31. Positioning hole; X, column direction; Y, row direction; Z, height direction. DETAILED DESCRIPTION

[0059] 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.

[0060] 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.

[0061] 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.

[0062] Specifically, the following Figure 1-Figure 23 A battery cell module according to an embodiment of the present invention is described.

[0063] The battery cell 1 module according to the embodiment of the present invention includes a battery cell 1 and a cold plate 2, wherein the battery cell 1 includes a pole 11, and the pole 11 includes a connecting portion 112 and a protruding portion 111, wherein the connecting portion 112 and the protruding portion 111 are riveted, and an accommodating groove 114 is defined between the outer wall surface of the protruding portion 111 and the outer wall surface of the connecting portion 112. At least a portion of the cold plate 2 is fitted in the accommodating groove 114 and is in heat exchange contact with the surface of the accommodating groove 114.

[0064] According to the battery cell module of the embodiment of the present invention, a receiving groove 114 is defined between the outer wall surface of the raised portion 111 in the pole 11 and the outer wall surface of the connecting portion 112. At this time, by fitting at least part of the cold plate 2 in the 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.

[0065] In addition, the raised portion 111 and the connecting portion 112 are riveted, which means that the shapes of the raised portion 111 and the connecting portion 112 can be designed independently without affecting each other. In this case, the shape design of the raised portion 111 and the connecting portion 112 is more flexible and the design cost is lower. As a result, a more complex receiving groove 114 can be defined between the outer wall surface of the raised portion 111 and the outer wall surface of the connecting portion 112. The manufacturing cost of the receiving groove 114 is lower and it can better meet the matching requirements with cold plates 2 of different sizes.

[0066] It should be noted that Figure 13-Figure 16 As shown, the cross-sectional shape of the protrusion 111 can be circular, elliptical, arcuate, etc.

[0067] In some embodiments, the battery cell 1 further includes a body, the connecting portion 112 is connected to the body and has a first surface 1121 opposite to the body, 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.

[0068] Taking the example that the connection portion 112 is arranged above the main body, the protrusion 111 extends along the height direction Z of the main body, 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 easy to assemble. Or taking the example that the main body is a rectangular parallelepiped and the pole 11 is located on the side wall in the width direction of the main body, 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 easy to assemble.

[0069] Specifically, Figure 2As 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 includes a shell 15, a winding core 14 installed in the shell 15, and a top cover 13 connected to the upper end opening of the shell 15. The connecting portion 112 of the pole 11 is arranged on the top cover 13 and welded to the pole lug on the winding core 14. When the battery cell 1 is charged and discharged, the mechanical parts near the pole lug of the winding core 14 generate a lot of heat, which is transferred to the cold plate 2 through the pole 11 to achieve rapid cooling of the area.

[0070] Alternatively, the accommodating groove 114 can also be arranged on the side wall surface of the pole 11, that is, the accommodating 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 pole 11 is arranged on the first end surface 131 of the body and includes a first part connected to the body and a second part arranged on the side wall surface of the first part, the second part is located at an end of the first part away from the body, the second part is spaced apart from the first end surface 131, and the surface of the second part facing the first end surface 131, the first end surface 131 and the side wall surface of the first part jointly define the accommodating groove 114. For example, the pole 11 is arranged on the first end surface 131 of the body and includes a first part connected to the body and two second parts arranged on the side wall surface of the first part, the two second parts are spaced apart in the height direction Z, and the surfaces of the two second parts facing each other and the side wall surface of the first part jointly define the accommodating groove 114.

[0071] It should be noted that the body of the battery cell 1 can be in a rectangular shape or in a cylindrical shape.

[0072] In some embodiments, Figure 1-Figure 4 As shown, there are two protrusions 111, which are arranged at intervals, and the outer wall surfaces of the two protrusions 111 and the first surface 1121 that are opposite to each other jointly define the receiving groove 114. That is, the surfaces of the two protrusions 111 that are opposite to each other and the portion of the first surface 1121 that is located between the two surfaces are connected to form the receiving groove 114.

[0073] That is, the receiving groove 114 is a U-shaped groove, and the cold plate 2 can be fitted in the receiving groove 114 through the upper end opening of the receiving groove 114, thereby making the cold plate 2 and the receiving groove 114 cooperate better, and the limiting reliability and heat exchange reliability of the pole 11 on the cold plate 2 are higher.

[0074] Specifically, the two protrusions 111 respectively form the first side surface 1112 and the second side surface 1113 of the receiving groove 114, and at least a portion of the first surface 1121 of the connecting portion 112 forms the bottom surface of the receiving groove 114. The cold plate 2 is in heat exchange contact with at least one of the first side surface 1112, the second side surface 1113 and the first surface 1121, and further, the cold plate 2 is in heat exchange contact with each of the first side surface 1112, the second side surface 1113 and the first surface 1121, thereby increasing the heat exchange area between the cold plate 2 and the pole 11 and increasing the heat exchange efficiency of the pole 11.

[0075] In some embodiments, Fig. 9 and Fig.10 As shown, there is one protrusion 111 , which is located at one end of the connecting portion 112 , and an outer wall surface of the protrusion 111 and the first surface 1121 define a receiving groove 114 .

[0076] That is, the receiving groove 114 is an L-shaped groove, and the cold plate 2 can be fitted in the L-shaped groove to make heat exchange contact with each of the protrusion 111 and the connection portion 112. At the same time, by setting the horizontal slot direction of the L-shaped groove, the cold plate 2 can be simultaneously fitted in two receiving grooves 114 arranged along the width direction of the receiving groove 114 and with openings facing each other, so as to reduce the number of cold plates 2 and improve the assembly efficiency of the battery cell module.

[0077] like Fig. 9 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.

[0078] 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.

[0079] As a result, the pole 11 of the first end surface 131 has a larger design area, so that the protrusion 111 and the busbar 3 have better welding reliability and current flow capacity, and the surface area of ​​the receiving groove 114 is large enough to increase the heat exchange efficiency with the cold plate 2.

[0080] 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.

[0081] 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.

[0082] In some embodiments, Figure 4 As shown, the distance between the two opposite sides 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 first side 1112 and the second side 1113 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.

[0083] 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.

[0084] and / or, if Figure 3 As shown, 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.

[0085] That is, the width of the protrusion 111 is not less than 4 mm to ensure that the protrusion 111 has sufficient bending strength. Taking the receiving groove 114 as a U-shaped groove as an example, the width direction of the protrusion 111 is consistent with the width direction of the receiving groove 114.

[0086] 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.

[0087] It should be noted that Figure 4As shown, 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.

[0088] In some embodiments, the total 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.

[0089] 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.

[0090] For example, the ratio of S1 to S2 may be 11%, 20%, 40%, 60% and 69%.

[0091] In some embodiments, Figure 5 and Fig.10 As shown, the battery cell 1 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 .

[0092] 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 14 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.

[0093] Specifically, no matter whether the receiving groove 114 is a U-shaped groove or an L-shaped groove, 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 basically does not affect the electrical connection between the protruding portion 111 of the pole 11 and the bus 3. At this time, the cold plate 2 is basically completely hidden in the receiving groove 114 in the height direction Z, and 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.

[0094] For example, Figure 17-Figure 20 As shown, when the receiving groove 114 is a U-shaped groove, a portion of the busbar 3 is located above the pole 11 and welded to the two protrusions 111, and another portion of the busbar 3 is located above the pole 11 on the adjacent battery cell 1 and welded to the two protrusions 111, thereby realizing the series connection of two adjacent battery cells 1. The busbar 3 spans across the two U-shaped grooves of the two poles 11 connected thereto.

[0095] For example, Fig.10 As shown, when the receiving groove 114 is an L-shaped groove, a portion of the busbar 3 is located above the pole 11 and welded to the protrusion 111, and another portion of the busbar 3 is located above the pole 11 on 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 across the two L-shaped grooves of the two poles 11 connected thereto.

[0096] In some embodiments, the surface of each protrusion 111 facing away from the first surface 1121 is provided with one of the positioning hole 31 and the positioning protrusion 1111 , the bus 3 is provided with the other of the positioning hole 31 and the positioning protrusion 1111 , and the positioning protrusion 1111 fits in the positioning hole 31 .

[0097] Through the plug-in fit between the positioning protrusion 1111 and the positioning hole 31 , the busbar 3 and the protrusion 111 are easily and accurately connected, and the connection between the busbar 3 and the protrusion 111 is convenient and reliable.

[0098] like Figure 5 and Figure 6 As shown, a positioning protrusion 1111 is provided on the upper surface of the protrusion 111 , and a positioning hole 31 is provided on the busbar 3 .

[0099] In some embodiments, Figure 5-Figure 7 and Fig.12As shown, there are multiple cells 1, and the multiple cells 1 are arranged in an array. The multiple cells 1 form multiple cell groups arranged along the column direction X of the array, and all the cell groups form multiple pole groups. Each pole group includes multiple poles 11 concentrically arranged along the row direction Y of the array. The receiving slots 114 extend along the row direction Y. The number of cold plates 2 is equal to the number of pole groups and corresponds one to one. The cold plates 2 are matched in all the receiving slots 114 of the corresponding pole groups, and any two adjacent cold plates 2 are connected in series.

[0100] That is, in each pole group, the receiving grooves 114 on all poles 11 are connected in sequence along the row direction Y to form a first heat dissipation channel, the number of cold plates 2 is equal to the number of first heat dissipation channels and corresponds one to one, and the cold plates 2 are matched in the corresponding first heat dissipation channels. By arranging any two adjacent cold plates 2 in series to form a U-shaped flow channel, it can be ensured that the battery cells 1 in the relative battery cell group are heated evenly and the temperature difference between the battery cells 1 is small.

[0101] In some embodiments, Fig. 9 and Fig.10 As shown, there are multiple cells 1, and the multiple cells 1 are arranged in an array. The multiple cells 1 form multiple cell groups arranged along the column direction X of the array. All 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.

[0102] 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.

[0103] It should be noted that the 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. Fig. 9 , Fig.10 and Fig.12 As shown, when the extending 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. Figure 5-Figure 7As shown, when the extending 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 .

[0104] In some embodiments, the body 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.

[0105] For example, Figure 5-Figure 7 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 column direction X, each battery cell group forms two pole groups, and the receiving grooves 114 on the two poles 11 on the battery cell 1 are U-shaped grooves. Each battery cell group corresponds to two cold plates 2, and the two cold plates 1 are in 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, and the row direction Y is the width direction.

[0106] 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.

[0107] For example, Fig. 9 and Fig.10 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.

[0108] For example, Fig.12 As shown, the battery cell 1 includes two poles 11, and the two poles 11 are both 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 U-shaped grooves, and multiple battery cell groups form multiple pole groups of equal number. At this time, each battery cell group corresponds to a cold plate 2, and the cold plate 2 is matched in all the receiving grooves 114 in the corresponding pole group to simultaneously achieve heat dissipation of all poles 11 on the corresponding battery cell group. 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.

[0109] For example, Figure 8 As shown, the battery cell 1 includes two poles 11, which are respectively arranged on the first end face 131 and the second end face, and each battery cell group forms two pole groups. The receiving grooves 114 on all poles 11 in each pole group are U-shaped grooves, and each battery cell group corresponds to two cold plates 2. The two cold plates 2 are respectively matched in the receiving grooves 114 formed by the two poles 11 to achieve heat exchange contact with the corresponding poles 11. Among them, the battery cell 1 is a rectangular parallelepiped, and the width direction of the receiving groove 114 is consistent with the width direction of the battery cell 1.

[0110] For example, Fig.24 and Fig.25 As shown, multiple cells 1 in the same cell group are connected in series through a bus bar 3, multiple cell groups are connected in series through a bus bar 3, and multiple cold plates 2 are connected in series along the arrangement direction of the multiple cell groups. At this time, when the insulation of a cold plate 2 fails, only the cell in the corresponding cell group will be short-circuited and fail, and the short-circuit voltage generated will not be too large, and the battery pack is safer.

[0111] For example, Figure 19-21 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.

[0112] 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.

[0113] In some embodiments, Fig.26As 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 and a vertical portion. The horizontal portion is matched in all the receiving grooves 114 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.

[0114] That is, the cold plate 2 also makes 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, thereby further increasing the heat exchange area between the cold plate 2 and the battery cells 1 and further improving the heat dissipation efficiency of the cold plate 2 on the battery cells 1.

[0115] Specifically, the height of the vertical portion of the cold plate 2 between the two battery cell groups 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.

[0116] In some embodiments, the dimension of the vertical portion in the height direction Z is d1, wherein d1≥5 mm. The vertical portion is provided with a collapse cavity.

[0117] That is, when the height of the vertical portion between the two battery cell groups in the cold plate 2 exceeds 5 mm, a collapse cavity is provided inside the cold plate 2 to ensure that the collapse cavity can be collapsed when the battery cell 1 expands, so that the vertical portion is compressed and deformed synchronously, thereby preventing the vertical portion from affecting the expansion of the battery cell 1 and causing a reduction in the service life and safety of the battery cell 1.

[0118] 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.

[0119] The size design of t1 ensures that the cold plate 2 has a lower thermal resistance to improve the heat dissipation efficiency between the poles 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 poles 11.

[0120] 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.

[0121] In some embodiments, Fig.17 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.

[0122] 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.

[0123] 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.

[0124] In some embodiments, the thickness of the heat-conducting layer 4 is d2, where d2<2 mm. This effectively reduces the thermal resistance of the heat-conducting layer 4 and effectively improves the heat dissipation efficiency of the cold plate 2 to the poles 11 and the busbars 3.

[0125] Specifically, the thickness d2 of the heat conducting layer 4 is less than 1 mm.

[0126] And / or, 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 .

[0127] Specifically, the heat transfer coefficient of the heat conducting layer 4 is greater than 1 W / mK.

[0128] It should be noted that in this embodiment, an insulating layer is also 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.

[0129] Illustratively, the thickness of the insulating layer is 0.1 mm, 0.4 mm, 0.7 mm or 1 mm.

[0130] The battery pack according to the embodiment of the present invention includes a battery cell 1 module as described in any of the above embodiments.

[0131] 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 1 module of the above embodiment, which will not be repeated here.

[0132] A vehicle according to an embodiment of the present invention includes a battery pack as described in the above embodiment.

[0133] 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.

[0134] 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.

[0135] 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.

[0136] 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.

[0137] 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.

[0138] 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.

[0139] 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 connecting portion and the protruding portion are riveted, and an accommodating groove is 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 which is fitted in the receiving groove and 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 number of the protrusions is two, the two protrusions are arranged at intervals, and the outer wall surfaces opposite to the two protrusions and the first surface jointly define the accommodating groove.

4. The battery cell module according to claim 2, characterized in that: The number of the protrusion is one, the protrusion is located at one end of the connecting portion, and the outer wall surface of the protrusion and the first surface define the accommodating groove.

5. 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.

6. The battery cell module according to any one of claims 2 to 5, characterized in that: The distance between two opposite side surfaces of the portion of the connecting portion protruding from the first surface along the depth direction of the receiving groove is H1, and the depth of the receiving groove is H2, wherein 0≤H1≤3mm, 0≤H2≤8mm; And / or, a distance between two opposite side surfaces of the protrusion along a direction perpendicular to the extending direction of the accommodating groove is L2, wherein 4mm≤L2≤30mm.

7. The battery cell module according to any one of claims 2 to 5, characterized in that: The total cross-sectional area of ​​the protrusion is S1, and the area of ​​the first surface is S2, wherein 10%<S1 / S2<70%.

8. The battery cell module according to any one of claims 2 to 5, 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.

9. The battery cell module according to claim 8, characterized in that: A surface of each of the protruding portions facing away from the first surface is provided with one of a positioning hole and a positioning protrusion, the bus bar is provided with the other of the positioning hole and the positioning protrusion, and the positioning protrusion is fitted in the positioning hole.

10. The battery cell module according to claim 3, 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 along the column direction of the array, and all the battery cell groups form multiple pole groups, and each pole group includes multiple poles concentrically arranged along the row direction of the array; The receiving groove extends along the row direction; The number of the cold plates is equal to and corresponds to the number of the pole groups. The cold plates are matched in all the receiving slots of the corresponding pole groups, and any two adjacent cold plates are connected in series.

11. The battery cell module according to claim 4, 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.

12. The battery cell module according to claim 10 or 11, 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.

13. A battery pack, characterized in that: Comprising a battery cell module as described in any one of claims 1-12.

14. A vehicle, characterized in that: Comprising the battery pack as claimed in claim 13.

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