Battery cell module, battery pack, and vehicle

Abstract

The present application 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 post, the pole post comprising a connecting part and a protruding part, and the protruding part being located at one end of the connecting part. An accommodating groove is defined between an outer wall face of the protruding part and an outer wall face of the connecting part. At least part of the width direction of the cold plate is fit in the accommodating groove and makes heat exchange contact with the surface of the accommodating groove. The battery cell module of the present application has the advantages of having a good heat dissipation effect for the pole post, high battery cell quick charging capacity, and good cold plate assembly flexibility.

Description

Battery modules, battery packs and vehicles

[0001] This application claims priority to the Chinese patent application filed with the Patent Office of China on March 29, 2024, with application number 202410381518.8 and invention name “Battery Cell Module, Battery Pack and Vehicle”, and the Chinese patent application filed with the Patent Office of China on the same day, with application number 202410381273.9 and invention name “Battery Cell Module, Battery Pack and Vehicle”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of vehicle technology, and in particular to a battery cell module, a battery pack and a vehicle. Background Art

[0003] As electric vehicles gain market share, users are increasingly demanding faster recharging times. The primary approach to improving recharging speeds is high-rate fast charging, which expands the battery cell's charge rate limits, enabling peak charging currents of 5C or higher for the entire pack. This increase in charging current exponentially increases the Joule heating generated by current-carrying components, such as the mechanical components within the battery cell and the busbars within the battery pack.

[0004] Related technologies use cold plates to dissipate heat from the top cover of a battery cell, where the poles are located. These plates typically come into direct heat exchange contact with the poles. To reduce the height space occupied by the liquid cold plate within the battery pack, a trough is also provided on the poles to partially accommodate the cold plate. However, these troughs can only accommodate cold plates of a matching width and are unable to accommodate wider cold plates, resulting in limited assembly flexibility. Summary of the Invention

[0005] The present application aims to solve one of the technical problems in the related art at least to a certain extent.

[0006] To this end, an embodiment of the present application 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.

[0007] An embodiment of the present application also provides a battery pack.

[0008] An embodiment of the present application further provides a vehicle.

[0009] The battery cell module of an embodiment of the present application 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.

[0010] In the battery cell module of the embodiment of the present application, the poles on the battery cells are provided with receiving slots. At this point, by fitting at least a portion of the cold plate within each receiving slot, direct heat exchange contact between the cold plate and the poles on the battery cells is achieved, thereby directly cooling the poles. This improves the pole heat dissipation efficiency, reduces the probability of overheating of the battery cells near the poles, and enhances the fast-charging capability of the battery cells. Furthermore, the design of the receiving slots reduces the volume of the portion of the cold plate exposed outside the poles, thus occupying less space within the battery pack and improving the battery pack space utilization.

[0011] 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 generally an L-shaped groove. At this time, a cold plate of any width can be fitted into 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.

[0012] In some embodiments, the battery cell 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.

[0013] In some embodiments, the number of the protrusions is two, the two protrusions are arranged at intervals, and the outer wall surfaces of the two protrusions facing each other and the first surface jointly define the accommodating groove;

[0014] Alternatively, 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.

[0015] In some embodiments, 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.

[0016] In some embodiments, a surface of the raised portion facing away from the first surface is provided with one of a positioning hole and a positioning protrusion, the busbar is provided with the other of the positioning hole and the positioning protrusion, and the positioning protrusion fits in the positioning hole.

[0017] In some embodiments, there are multiple battery cells, and the multiple battery cells are arranged in an array. The multiple battery cells form multiple battery cell groups arranged in the column direction of the array. All the battery cells form at least one pair of electrode groups arranged and adjacent in the column direction. Each electrode group includes multiple electrodes concentrically arranged in the row direction of the array. In each pair of electrode groups, the opening of the accommodating slot on one electrode group in the column direction is opposite to the opening of the accommodating slot on the other electrode group in the column direction.

[0018] The accommodating groove extends along the row direction;

[0019] 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 fitted in all the receiving slots of a corresponding pair of the pole groups, and any two adjacent cold plates are connected in series.

[0020] 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.

[0021] 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. The cold plate includes a horizontal portion and a vertical portion. The horizontal portion is fitted in all the accommodating slots in 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.

[0022] In some embodiments, the vertical portion has a height dimension of d1, wherein d1 ≥ 5 mm;

[0023] The vertical portion is provided with a collapse cavity.

[0024] In some embodiments, there is at least one pair of battery cells, each pair of battery cells is arranged in the column direction and adjacent to each other, 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;

[0025] 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.

[0026] In some embodiments, the cold plate includes a harmonica tube, and the harmonica tube is formed with a plurality of flow channel single 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 flow channel single 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.

[0027] In some embodiments, the battery module further includes a heat-conducting layer coated on the surface of the cold plate, and the cold plate is in heat exchange contact with the surface of the receiving tank through the heat-conducting layer, and the heat-conducting layer is at least one of a thermally conductive adhesive and a thermally conductive pad; wherein,

[0028] The thickness of the heat-conducting layer is d2, wherein d2 is less than 2 mm, and / or the heat transfer coefficient of the heat-conducting layer is greater than 0.1 W / mK.

[0029] In some embodiments, an insulating layer is provided on the outer surface of the cold plate, and the thickness of the insulating layer is d3, wherein 0.1 mm≤d3≤1 mm.

[0030] In some embodiments, the connecting portion and the protruding portion are integrally formed, or the connecting portion and the protruding portion are riveted.

[0031] 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.

[0032] 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;

[0033] 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 4 mm ≤ L2 ≤ 30 mm.

[0034] 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%.

[0035] The battery pack according to an embodiment of the present application includes the battery cell module as described in any of the above embodiments.

[0036] The technical advantages of the battery pack according to the embodiment of the present application are the same as the technical advantages of the battery cell module of the above embodiment, and will not be repeated here.

[0037] A vehicle according to an embodiment of the present application includes a battery pack as described in the above embodiment.

[0038] The technical advantages of the vehicle according to the embodiment of the present application are the same as the technical advantages of the battery pack in the above-mentioned embodiment, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0040] FIG1 is a schematic diagram of a battery cell in a battery cell module according to an embodiment of the present application.

[0041] FIG2 is a schematic diagram of a battery cell module according to an embodiment of the present application.

[0042] FIG3 is a cross-sectional view of a battery cell module according to an embodiment of the present application.

[0043] FIG4 is a schematic diagram of an array of multiple battery cells of a battery cell module according to an embodiment of the present application.

[0044] FIG. 5 is an enlarged view A of FIG. 4 .

[0045] FIG6 is a schematic diagram of the battery cell series connection path and cooling channel direction of FIG4 .

[0046] FIG7 is another schematic diagram of a battery cell in a battery cell module according to an embodiment of the present application.

[0047] FIG8 is an exploded view of a battery cell in a battery cell module according to an embodiment of the present application.

[0048] FIG9 is a front view of a battery cell in a battery cell module according to an embodiment of the present application.

[0049] FIG10 is a top view of a battery cell in a battery cell module according to an embodiment of the present application.

[0050] FIG11 is a schematic diagram of a battery cell module according to an embodiment of the present application.

[0051] FIG12 is an exploded view of a battery cell module according to an embodiment of the present application.

[0052] FIG13 is another exploded view of the battery cell module according to an embodiment of the present application.

[0053] FIG14 is another schematic diagram of a battery cell in a battery cell module according to an embodiment of the present application.

[0054] FIG15 is another top view of the battery cell in the battery cell module according to an embodiment of the present application.

[0055] FIG16 is another schematic diagram of a battery cell module according to an embodiment of the present application.

[0056] FIG17 is a top view 1 of a battery cell of a battery cell module according to an embodiment of the present application.

[0057] FIG18 is a top view 2 of a battery cell of a battery cell module according to an embodiment of the present application.

[0058] FIG19 is a top view 3 of a battery cell of a battery cell module according to an embodiment of the present application.

[0059] FIG20 is another schematic diagram of the battery cell of the battery cell module according to the embodiment of the present application.

[0060] FIG21 is a schematic diagram of a cell group of a cell module according to an embodiment of the present application.

[0061] FIG22 is a schematic diagram of a cell group and a busbar of a cell module according to an embodiment of the present application.

[0062] FIG23 is another schematic diagram of an array of multiple battery cells of a battery cell module according to an embodiment of the present application.

[0063] FIG24 is a schematic diagram of the battery cell series connection path and cooling channel direction of FIG23.

[0064] FIG25 is another schematic diagram of an array of multiple battery cells of a battery cell module according to an embodiment of the present application.

[0065] FIG26 is a schematic diagram of the battery cell series connection path and cooling channel direction of FIG25.

[0066] Figure numerals: 1, battery cell; 11, pole; 111, protrusion; 1111, positioning protrusion; 1112, first side; 1113, second side; 112, connecting portion; 1121, first side; 114, receiving groove; 12, body; 121, first end face; 13, top cover; 14, winding core; 15, shell; 2, cold plate; 21, horizontal part; 22, vertical part; 3, bus; 31, positioning hole; 4, thermal conductive layer; X, column direction; Y, row direction; Z, height direction. Specific embodiments

[0067] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0068] The applicant discovered 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 the poles and busbars was also low, so there was no need for particularly high-intensity cooling of the battery. Therefore, pole cooling is not necessary, and conventional thermal management solutions with general strength, such as bottom cooling, can meet the cooling needs of the battery cells. However, under the requirements of 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 the busbar is significant, and the uneven temperature distribution is even more obvious. Therefore, a solution for directly cooling current-carrying components such as the busbar is needed: pole cooling.

[0069] The applicant's hollow pole cooling solution, designed to address the aforementioned shortcomings, is the result of close collaboration across multiple disciplines. This solution involves numerous components, including battery cells, busbars, cold plates, and thermal adhesive. These include battery cells, packaging systems, overall layout, thermal management, and packaging processes. Key application challenges include overall package insulation, cell flatness, thermal management effectiveness, and grouping methods. Therefore, the development of this solution required the demand for high-rate fast charging and close collaboration across various disciplines to conceive a thermal management solution with high cooling intensity and efficient space utilization.

[0070] Specifically, the battery cell module according to the embodiment of the present application is described below with reference to FIG1 to FIG6 .

[0071] The battery cell module of the embodiment of the present application 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. 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. 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.

[0072] According to the battery cell module of the embodiment of the present application, the pole 11 on the battery cell 1 is provided with a receiving groove 114. At this time, by fitting at least a portion of the cold plate 2 into 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 portion of the cold plate 2 exposed outside the pole 11 smaller, occupies less space in the battery pack, and improves the space utilization rate of the battery pack.

[0073] At the same time, the number of protrusions 111 is set to one and is located at one end of the connecting portion 112, so that the defined accommodating groove 114 is roughly an L-shaped groove. At this time, a cold plate 2 of any width can be fitted into the accommodating groove 114, that is, the accommodating groove 114 can match 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 accommodating groove 114, and the assembly flexibility of the cold plate 2 is good.

[0074] It should be noted that, as shown in Figure 1, when the cross-sectional outer contour of the pole 11 is rectangular, the cross section is a surface parallel to the first surface 1121. It is preferred that the raised portion 111 is provided at one end of the connecting portion 112 in the width direction, and the cross-sectional area of ​​the raised portion 111 is substantially equal to half the cross-sectional area of ​​the connecting portion 112.

[0075] It should be noted that, as shown in FIG. 17 to FIG. 20 , the cross-sectional shape of the protrusion 111 can be circular, elliptical, arched, etc.

[0076] 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.

[0077] Taking the example of a case where the connection portion 112 is located above the body 12, in this case, the raised portion 111 extends along the height direction Z of the body 12, and the receiving groove 114 defined between the outer wall surface of the raised portion 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 can be easily fitted into the receiving groove 114 through the upper opening, facilitating assembly of the cold plate 2 and the battery cells 1. Alternatively, taking the example of a case where the body 12 is a rectangular parallelepiped and the poles 11 are located on the sidewalls of the body 12 in the width direction, the receiving groove 114 formed in this case is also opened in a direction away from the rectangular parallelepiped, and the cold plate 2 can be easily fitted into the receiving groove 114 through this opening, facilitating assembly of the cold plate 2 and the battery cells 1.

[0078] Specifically, as shown in Figure 8, the area of ​​first surface 1121 is larger than the cross-sectional area of ​​raised portion 111, and the cross-sectional area is parallel to first surface 1121. Body 12 includes a housing 15, a winding core 14 mounted within housing 15, and a top cover 13 connected to the upper opening of housing 15. The connection portion 112 of pole 11 is mounted on top cover 13 and welded to the tab on winding core 14. During charging and discharging of battery cell 1, the mechanical components near the tab of winding core 14 generate a significant amount of heat. This heat is transferred to cold plate 2 through pole 11, rapidly cooling this area.

[0079] For example, as shown in Figures 1 and 17, the accommodating groove 114 can also be provided on the side wall surface of the pole 11. That is, the accommodating groove 114 is a U-shaped groove that opens only 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, ensuring that it has a sufficiently large welding area and current carrying capacity with the busbar 3. For example, the raised portion 111 and the connecting portion 112 are arranged in a direction perpendicular to the height direction of the battery cell 1, and the raised portion 111 is spaced apart from the first end surface 121 of the body 12. The surface of the raised portion 111 facing the first end surface 121, the first end surface 121, and the sidewall surface of the connecting portion 112 jointly define the accommodating groove 114.

[0080] It should be noted that the body 12 of the battery cell 1 can be in a rectangular parallelepiped shape or a cylindrical shape.

[0081] In some embodiments, as shown in Figures 7-10, there are two protrusions 111, which are arranged at an interval. The opposing outer wall surfaces of the two protrusions 111 and the first surface 1121 jointly define a receiving groove 114. That is, the opposing surfaces of the two protrusions 111 and the portion of the first surface 1121 located between the two surfaces are connected to form the receiving groove 114.

[0082] That is, the accommodating groove 114 is a U-shaped groove, and the cold plate 2 can be fitted into the accommodating groove 114 through the upper end opening of the accommodating groove 114, thereby making the cold plate 2 and the accommodating groove 114 better matched, and the limiting reliability and heat exchange reliability of the pole 11 on the cold plate 2 are higher.

[0083] Specifically, the two raised portions 111 respectively form a first side surface 1112 and a 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. Furthermore, 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 improving the heat exchange efficiency of the pole 11.

[0084] In some embodiments, as shown in FIG. 1 and FIG. 2 , there is one protrusion 111 , which is located at one end of the connecting portion 112 . The outer wall of the protrusion 111 and the first surface 1121 define a receiving groove 114 .

[0085] That is, the receiving groove 114 is an L-shaped groove, and the cold plate 2 can be fitted into the L-shaped groove to exchange heat 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 fitted into two receiving grooves 114 arranged along the width direction of the receiving groove 114 and with the openings facing each other, thereby reducing the number of cold plates 2 and improving the assembly efficiency of the battery module.

[0086] As shown in Figure 1, when the cross-sectional outer contour of the pole 11 is rectangular, the cross section is a surface parallel to the first surface 1121. It is preferred that the raised portion 111 is provided at one end of the connecting portion 112 in the width direction, and the cross-sectional area of ​​the raised portion 111 is substantially equal to half the cross-sectional area of ​​the connecting portion 112.

[0087] In some embodiments, as shown in FIG. 2 and FIG. 3 , the battery cell module further includes a bus bar 3 , which is connected to the protrusion 111 , and is in heat exchange contact with a surface of the cold plate 2 facing away from the first surface 1121 .

[0088] That is, the cold plate 2 also realizes direct cooling of the busbar 3, thereby enabling the heat generated by the mechanical parts such as the tabs of the winding core 14 in the battery cell 1 to be quickly carried away through the pole 11 and the busbar 3, further avoiding local overheating of the battery cell module and resulting in power limitation of the battery cell 1, and the fast charging capability of the battery cell 1 is higher. Specifically, 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 busbar 3. While the cold plate 2 realizes direct contact with the pole 11 and the busbar 3, it basically does not affect the electrical connection between the protrusion 111 of the pole 11 and the busbar 3. At this time, the cold plate 2 is basically 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.

[0089] For example, as shown in FIG21 , 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, while another portion of the busbar 3 is located above the pole 11 of the adjacent battery cell 1 and welded to the two protrusions 111, thereby achieving the series connection of two adjacent battery cells 1. The busbar 3 spans the two U-shaped grooves of the two poles 11 connected to it.

[0090] For example, as shown in Figures 2 and 3, 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 of the adjacent battery cell 1 and welded to the protrusion 111, thereby achieving the series connection of two adjacent battery cells 1. The busbar 3 spans the two L-shaped grooves of the two poles 11 connected to it.

[0091] In some embodiments, the surface of the raised portion 111 facing away from the first surface 1121 is provided with one of the positioning hole 31 and the positioning protrusion 1111 , and 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 .

[0092] By plugging and fitting the positioning protrusion 1111 and the positioning hole 31 , 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.

[0093] For example, as shown in FIG. 11 and FIG. 12 , 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 .

[0094] In some embodiments, as shown in Figures 11-13 and 16 , there are multiple battery cells 1 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 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. A cold plate 2 fits into all receiving slots 114 in the corresponding pole group, and any two adjacent cold plates 2 are connected in series.

[0095] That is, in each terminal group, the receiving slots 114 on all terminals 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, with each cold plate 2 fitted within a corresponding first heat dissipation channel. By connecting any two adjacent cold plates 2 in series to form a U-shaped flow channel, the battery cells 1 in the relative cell group are heated evenly, with minimal temperature differences between the cells 1.

[0096] In some embodiments, there are multiple battery cells 1, which 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 electrode groups arranged and adjacent in the column direction X. Each electrode group includes multiple electrodes 11 concentrically arranged along the row direction Y of the array. In each pair of electrode groups, the opening of the receiving slots 114 on one electrode group in the column direction X is opposite to the opening of the receiving slots 114 on the other electrode group in the column direction X. The receiving slots 114 extend along the row direction Y. The number of cold plates 2 is equal to the number of pairs of electrode groups and corresponds one to one. The cold plates 2 are fitted into all receiving slots 114 of a corresponding pair of electrode groups, and any two adjacent cold plates 2 are connected in series.

[0097] Specifically, the two pole groups in each pair are arranged in mirror-symmetric fashion. The receiving slots 114 on one pole group are aligned in the column direction X and are positioned opposite and adjacent to the receiving slots 114 on the other pole group. All receiving slots 114 in each pair of pole groups collectively define a second heat dissipation channel with a U-shaped cross-section extending in the row direction Y. The cold plate 2 fits within the second heat dissipation channel to achieve heat exchange contact with all poles 11 in each pair of pole groups. This reduces the number of cold plates 2 required, improving cell module assembly efficiency.

[0098] It should be noted that the row direction Y refers only to the extension direction of the receiving slots 114 and does not specifically refer to a specific direction of the battery cell 1. Taking a rectangular battery cell 1 as an example, as shown in Figures 2, 3, and 5, when the extension direction of the receiving slots 114 coincides with the length direction of the battery cell 1, the row direction Y corresponds to the length direction of the battery cell 1, and the column direction X corresponds to the width direction of the battery cell 1. Similarly, when the extension direction of the receiving slots 114 coincides with the width direction of the battery cell 1, the row direction Y corresponds to the width direction of the battery cell 1, and the column direction X corresponds to the length direction of the battery cell 1.

[0099] In some embodiments, as shown in FIG2 , there are at least one pair of battery cells 1 , each pair of battery cells 1 being arranged adjacent to each other in the column direction X. In each pair of battery cells 1 , the opening of the receiving slot 114 on one battery cell 1 in the column direction X is opposite the opening of the receiving slot 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. A cold plate 2 fits within all receiving slots 114 in a corresponding pair of battery cells 1. In this case, the number of cold plates 2 is at least half the number of battery cells 1. Thus, fewer cold plates 2 are needed to cool all poles 11, resulting in high assembly efficiency for the cold plates 2.

[0100] Specifically, as shown in FIG. 2 , 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 .

[0101] In some embodiments, the body 12 includes a first end face 121 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 121, or the two poles 11 are respectively arranged on the first end face 121 and the second end face.

[0102] For example, as shown in FIG1 , a battery cell 1 includes two poles 11 . Both poles 11 are disposed on a first end surface 121 and spaced apart along a row direction Y, with each cell group forming a pole group. The receiving slots 114 on the two poles 11 on the battery cell 1 are L-shaped slots. Multiple cell groups form multiple pairs of pole groups, with the number of pole group pairs being half the number of cell groups. In each pair of pole groups, the openings of all receiving slots 114 on one pole group in the column direction X are opposite to the openings of all receiving slots 114 on the other pole group in the column direction X. In this case, each pair of pole groups, or in other words, every two cell groups, corresponds to a cold plate 2 . The cold plate 2 fits within all receiving slots 114 in the corresponding pair of pole groups to simultaneously dissipate heat for all poles 11 on both cell groups. The battery cell 1 is rectangular in shape, with the column direction X representing the width of the battery cell 1 and the row direction Y representing the length of the battery cell 1.

[0103] For example, a battery cell 1 includes two poles 11, both of which are disposed on a first end surface 121 and spaced apart along a column direction X. Each battery cell group forms two pole groups. The receiving slots 114 on the two poles 11 on the battery cell 1 are L-shaped slots, with the opening of one receiving slot 114 in the column direction X opposing the opening of the other receiving slot 114 in the column direction X. Each battery cell group corresponds to a cold plate 2, and a cold plate 2 is simultaneously fitted within two receiving slots 114 on the same battery cell 1 to exchange heat with the two poles 11 on the same battery cell 1. The battery cell 1 is a rectangular parallelepiped, with the column direction X of the battery cell 1 being the length direction of the battery cell 1, and the row direction Y being the width direction of the battery cell 1.

[0104] For example, as shown in Figures 1 and 2, a battery cell 1 includes two poles 11. Both poles 11 are disposed on a first end surface 131 and spaced apart along a row direction Y, with each cell group forming a pole group. The receiving slots 114 on the two poles 11 on the battery cell 1 are L-shaped slots. Multiple cell groups form multiple pairs of pole groups, with the number of pole group pairs being half the number of cell groups. In each pair of pole groups, the openings of all receiving slots 114 on one pole group in the column direction X are opposite the openings of all receiving slots 114 on the other pole group in the column direction X. In this case, each pair of pole groups, or in other words, every two cell groups, corresponds to a cold plate 2. The cold plate 2 fits within all receiving slots 114 in the corresponding pair of pole groups to simultaneously dissipate heat from all poles 11 on both cell groups. The battery cell 1 is rectangular in shape, with the column direction X representing the width of the battery cell 1 and the row direction Y representing the length of the battery cell 1.

[0105] For example, as shown in Figure 16, the battery cell 1 includes two poles 11, both of which are arranged on the first end surface 131 and are spaced apart 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 a plurality of pole groups of equal number. At this time, each battery cell group corresponds to a cold plate 2, and the cold plate 2 is fitted in all the receiving grooves 114 in the corresponding pole group to simultaneously achieve heat dissipation for 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.

[0106] For example, as shown in Figure 14, the battery cell 1 includes two poles 11, which are respectively arranged on the first end face 131 and the second end face. Each battery cell group forms two pole groups. The receiving grooves 114 on all poles 11 in each pole group are U-shaped grooves. Each battery cell group corresponds to two cold plates 2. The two cold plates 2 are respectively fitted into 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.

[0107] For example, as shown in Figures 25 and 26, multiple cells 1 in the same cell group are connected in series via a busbar 3, multiple cell groups are connected in series via a busbar 3, and multiple cold plates 2 are connected in series along the arrangement direction of the multiple cell groups. In this case, if the insulation of a cold plate 2 fails, only the cells in the corresponding cell group will short-circuit and fail. The resulting short-circuit voltage will not be excessive, and the battery pack is safer.

[0108] For example, as shown in Figures 4 to 6, 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), and 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.

[0109] It should be noted that the battery cell 1 can also be cylindrical, with the height direction of the battery cell 1 being 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 arranging multiple battery cells 1 in an array, it is sufficient 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. The concentric arrangement refers to the centerline of the receiving slot 114 along its extension direction being collinear with the centerlines of the other receiving slots 114 in the same pole group.

[0110] In some embodiments, as shown in Figures 3 and 4, two paired pole groups are respectively provided on different battery cell groups, and the two battery cell groups corresponding to the two paired pole groups are spaced apart along the row direction Y. The cold plate 2 includes a horizontal portion 21 and a vertical portion 22. The horizontal portion 21 fits within all the accommodating slots 114 of the corresponding pair of pole groups, and the vertical portion 22 is located between the two battery cell groups and in heat exchange contact with the two battery cell groups.

[0111] 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.

[0112] Specifically, the height of the vertical portion 22 of the cold plate 2 located between the two battery cell groups is less than or equal to the height of the battery cell 1 , and this portion can be in heat exchange contact with the battery cell 1 via thermal conductive glue or a thermal conductive pad.

[0113] In some embodiments, the vertical portion 22 has a dimension d1 in the height direction Z, wherein d1 ≥ 5 mm. The vertical portion 22 is provided with a collapse cavity.

[0114] 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 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.

[0115] In some embodiments, the cold plate 2 includes a harmonica tube, which is formed with a plurality of 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 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.

[0116] The design of t1 ensures low thermal resistance of the cold plate 2, thereby improving heat dissipation efficiency to the pole 11. The design of b1, t2, b2, and k1 ensures a sufficiently large total cross-sectional area of ​​the single hole in the harmonica tube-molded flow channel, thereby providing a sufficiently large flow rate, further improving heat dissipation efficiency to the pole 11.

[0117] Specifically, b1 can be 11 mm, 15 mm, and 20 mm; t1, t2, and k1 can be 2 mm, 2.5 mm, and 2.9 mm; and b2 can be 3.1 mm, 3.5 mm, and 4 mm, etc. The dimensions b2 and k1 of the single flow channel hole correspond to the other dimensions b1, t1, and t2 of the harmonica tube. For example, given a constant b1 size, to achieve a greater flow rate, i.e., to increase the dimensions b2 and k1 of the single flow channel hole, t1 and t2 can both be set to 2 mm, resulting in b2 and k1 being 4 mm and 2.9 mm, respectively. Alternatively, t1 and t2 can both be set to 2.9 mm, resulting in b2 and k1 being 3.1 mm and 2 mm, respectively.

[0118] In some embodiments, as shown in FIG3 , the battery cell module further includes a thermal conductive 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 thermal conductive layer 4 . The thermal conductive layer 4 is at least one of a thermal conductive glue and a thermal conductive pad.

[0119] 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.

[0120] 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.

[0121] The thickness of the heat conducting layer 4 is d2, where 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. This effectively reduces the thermal resistance of the heat conducting layer 4 and improves the heat dissipation efficiency of the cold plate 2 to the poles 11 and the busbar 3.

[0122] Specifically, the thickness d2 of the heat conducting layer 4 is less than 1 mm.

[0123] 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 busbar 3 .

[0124] Specifically, the heat transfer coefficient of the heat conducting layer 4 is greater than 1 W / mK.

[0125] 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 making 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.

[0126] Illustratively, the thickness of the insulating layer is 0.1 mm, 0.4 mm, 0.7 mm or 1 mm.

[0127] In some embodiments, the connecting portion 112 and the protruding portion 111 are integrally formed, thereby facilitating the forming of the pole 11 and ensuring high positional accuracy between the connecting portion 112 and the protruding portion 111 .

[0128] Alternatively, the connection portion 112 and the raised portion 111 can be riveted together. This ensures the connection strength between the connection portion 112 and the raised portion 111, facilitates the processing of the raised portion 111 into a specific shape, and facilitates the formation of the receiving groove 114 that matches the cold plate 2. This reduces the production cost of the receiving groove 114 and allows for better compatibility with cold plates 2 of varying sizes.

[0129] In some embodiments, the battery cell 1 further includes an explosion-proof valve, which is disposed on different surfaces of the body 12 along with the pole 11. This allows the pole 11 on the first end surface 121 to have a larger design area, thereby improving welding reliability and current flow capacity between the protrusion 111 and the busbar 3. Furthermore, the surface area of ​​the receiving groove 114 is sufficiently large, thereby increasing heat exchange efficiency with the cold plate 2.

[0130] For example, the two poles 11 on the battery cell 1 are both arranged on the first end face 121, and the explosion-proof valve is arranged on the second end face 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.

[0131] For example, the two poles 11 on the battery cell 1 are respectively arranged on the first end face 121 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. Adjacent battery cell groups can also be arranged at intervals to form a flue gas channel connected to the explosion-proof valve between the two adjacent battery cell groups.

[0132] In some embodiments, the distance between two opposing 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, where 0≤H1≤3mm and 0≤H2≤8mm. By setting H1 to not more than 3mm, the receiving groove 114 can be designed to be sufficiently deep while ensuring the overall structural strength of the pole 11, thereby ensuring a larger surface area of ​​the receiving groove 114, thereby increasing the heat exchange area between the cold plate 2 and the pole 11 and improving the heat exchange efficiency. By setting H2 to not more than 8mm, the height of the protruding portion 111 is effectively prevented from being too large, thereby resulting in low bending strength.

[0133] Specifically, the height of the connecting 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 connecting portion 112 and the depth of the receiving groove 114 are inversely proportional. When the height of the connecting portion 112 is 1 mm, the depth of the receiving groove 114 is set to 8 mm. When the height of the connecting portion 112 is 3 mm, the depth of the receiving groove 114 is set to 4 mm or 6 mm.

[0134] And / or, a 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.

[0135] 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.

[0136] At the same time, the width of the protrusion 111 is not greater than 30 mm to ensure that the width of the accommodating 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.

[0137] It should be noted that, taking the cross-sectional outer contour of the pole 11 as a rectangle, both poles 11 are arranged on the first end face 121, 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 length edge of the shell 15 is L1, the minimum distance from the pole 11 to the width edge of the shell 15 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.

[0138] 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%.

[0139] By setting S1 / S2 to be greater than 10%, a sufficiently large contact area is ensured between the protrusion 111 and the busbar 3, thereby ensuring welding reliability and current carrying capacity between the protrusion 111 and the busbar 3. By setting S1 / S2 to be less than 70%, a sufficiently large surface area is ensured for the receiving groove 114 defined between the protrusion 111 and the connecting portion 112 to accommodate a sufficiently large cold plate 2, thereby ensuring that the cold plate 2 has good heat dissipation efficiency for the pole 11.

[0140] For example, the ratio of S1 to S2 may be 11%, 20%, 40%, 60% and 69%.

[0141] The battery pack according to an embodiment of the present application includes a battery cell module as described in any of the above embodiments.

[0142] The technical advantages of the battery pack according to the embodiment of the present application are the same as the technical advantages of the battery cell module of the above embodiment, and will not be repeated here.

[0143] A vehicle according to an embodiment of the present application includes a battery pack as described in the above embodiment.

[0144] The technical advantages of the vehicle according to the embodiment of the present application are the same as the technical advantages of the battery pack in the above-mentioned embodiment, and will not be repeated here.

[0145] In the description of the present application, it should 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" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0146] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0147] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0148] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it 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. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0149] In this application, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" 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 application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0150] Although the above embodiments have been shown and described, it is understood that the above embodiments are illustrative and cannot be understood as limitations on the present application. Changes, modifications, substitutions and variations of the above embodiments made by ordinary technicians in this field are all within the scope of protection of the present application.

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: There are two protrusions, which are arranged at intervals, and the outer wall surfaces of the two protrusions facing each other and the first surface jointly define the receiving groove; Alternatively, 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.

4. 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.

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

6. The battery cell module according to claim 2, characterized in that: There are a plurality of battery cells, and the plurality of battery cells are arranged in an array. The plurality of battery cells form a plurality of battery cell groups arranged in a column direction of the array. All of the battery cells form at least one pair of electrode groups arranged and adjacent in the column direction. Each electrode group includes a plurality of electrodes concentrically arranged in a row direction of the array. In each pair of electrode groups, an opening of the receiving slot on one electrode group in the column direction is opposite to an opening of the receiving slot on the other electrode group in the column direction. The accommodating 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 fitted in all the receiving slots of the corresponding pole groups, and any two adjacent cold plates are connected in series.

7. The battery cell module according to claim 6, characterized in that: 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, 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 6, 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 fitted in all the accommodating slots 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 height dimension of the vertical portion is d1, where d1 is ≥ 5 mm; The vertical portion is provided with a collapse cavity.

10. The battery cell module according to any one of claims 1 to 9, characterized in that: There are at least one pair of battery cells, each pair of battery cells is arranged in a column direction and adjacent to each other, 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; 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.

11. The battery cell module according to any one of claims 1 to 10, characterized in that: The cold plate 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 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.

12. The battery cell module according to any one of claims 1 to 11, 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 tank through the heat-conducting layer, and the heat-conducting layer is at least one of a heat-conducting glue and the heat-conducting pad; wherein, The thickness of the heat-conducting layer is d2, wherein d2 is less than 2 mm, and / or the heat transfer coefficient of the heat-conducting layer is greater than 0.1 W / mK.

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

14. The battery cell module according to any one of claims 1 to 13, characterized in that: The connecting portion and the raised portion are integrally formed, or the connecting portion and the raised portion are riveted.

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

16. 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 4 mm ≤ L2 ≤ 30 mm.

17. 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%.

18. A battery pack, characterized in that: Comprising the battery cell module according to any one of claims 1 to 17.

19. A vehicle, characterized in that: Comprising the battery pack as claimed in claim 18.

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