Battery pack and power device

Abstract

The present application relates to a battery pack and an electrical device, comprising: a cold plate, on which a plurality of first arcuate grooves are arranged in an array in sequence along a first direction, and each of the first arcuate grooves extends along a second direction; a battery cell group, which is arranged on a side of the cold plate close to the first arcuate grooves, and the battery cell group includes a plurality of cylindrical battery cells, and each of the first arcuate grooves has the cylindrical battery cell installed therein; a bracket, which is connected to the cold plate, and the battery cell group is clamped between the cold plate and the bracket; an exhaust channel connected to the outside is formed between the bracket and the cold plate, and the explosion-proof portion of the cylindrical battery cell is arranged toward the exhaust channel.

Description

Technical Field

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

[0002] Cylindrical cells are widely used in power batteries due to their high structural strength. A cooling mechanism is often provided in power batteries to cool the cells so that the temperature of the power battery meets the requirements.

[0003] In the traditional technology, the cooling mechanism includes a serpentine tube, which is wound around the circumference of the cylindrical battery cell. The cooling medium in the serpentine tube exchanges heat with the cylindrical battery cell, thereby reducing the temperature of the cylindrical battery cell. However, the method of winding the cylindrical battery cell with a serpentine tube has many branches, complex components, and inaccurate assembly positioning. In addition, the cooling mechanism is connected to the water channel in series or parallel, which has many risk points of sealing failure, and leakage may cause safety accidents. Summary of the invention

[0004] Based on this, it is necessary to provide a battery pack and an electrical device to address the above problems, which are convenient for positioning the cylindrical battery cells and have a lower risk of sealing failure, thereby improving the assembly efficiency and safety of the power battery.

[0005] A battery pack, comprising:

[0006] The cold plate is provided with a plurality of first arc grooves in an array in sequence along the first direction, and each of the first arc grooves extends along the second direction;

[0007] A battery cell group is arranged on a side of the cold plate close to the first arc-shaped groove, and the battery cell group includes a plurality of cylindrical battery cells, and each of the first arc-shaped grooves is equipped with the cylindrical battery cell;

[0008] The bracket is connected to the cold plate, and the battery cell group is sandwiched between the cold plate and the bracket; an exhaust channel connected to the outside is formed between the bracket and the cold plate, and the explosion-proof part of the cylindrical battery cell is arranged toward the exhaust channel.

[0009] In one embodiment, the cold plate includes a first sub-plate and a second sub-plate, the first sub-plate and the second sub-plate are connected along a third direction, and a cooling channel for cooling medium to flow is formed therebetween.

[0010] In one embodiment, the cooling channel includes a plurality of sub-channels corresponding to the first arc-shaped grooves one by one and extending along the second direction;

[0011] The first sub-plate includes a first arc-shaped portion and a first straight portion connected to the first arc-shaped portion, and the second sub-plate includes a second arc-shaped portion and a second straight portion connected to the second arc-shaped portion; the first arc-shaped portion corresponds to the second arc-shaped portion one by one, the first arc-shaped portion is embedded in the corresponding second arc-shaped portion and the two form a sub-flow channel, and the first arc-shaped groove is formed on the first arc-shaped portion; the first straight portion and the second straight portion are fitted and fixed.

[0012] In one embodiment, an inlet channel for cooling medium to enter the cold plate and an outlet channel for cooling medium to flow out of the cold plate are formed between the first sub-plate and the second sub-plate along the first direction, and each of the sub-channels is connected to the inlet channel and the outlet channel.

[0013] In one embodiment, the bracket includes a frame body and two extension portions respectively located at two ends of the frame body along the second direction, and the cold plate includes a plate body and two step portions respectively located at two ends of the plate body along the second direction and arranged in a step manner with the plate body;

[0014] The first arc groove is provided on the plate body, and the battery cell group is provided between the plate body and the frame body; each of the extension portions corresponds to one of the step portions, and forms an exhaust channel extending along the first direction; the two exhaust channels are respectively a first exhaust channel and a second exhaust channel;

[0015] The explosion-proof parts of some of the cylindrical battery cells face the first exhaust channel, and the explosion-proof parts of some of the cylindrical battery cells face the second exhaust channel.

[0016] In one embodiment, at least one third exhaust channel extending along the first direction is formed between the frame and the plate, and the third exhaust channel forms an exhaust port at at least one end in the first direction;

[0017] The explosion-proof parts of some of the cylindrical battery cells face the third exhaust channel.

[0018] In one embodiment, the frame has a recessed portion that is recessed away from the plate body, and the third exhaust channel is formed between the recessed portion and the plate body.

[0019] In one embodiment, the battery cell group includes a plurality of battery cell subgroups sequentially arranged along the second direction, and each of the battery cell subgroups includes a plurality of the cylindrical battery cells arranged along the first direction;

[0020] The explosion-proof parts of all the cylindrical battery cells in a group of the battery cell subgroups located at one end edge in the second direction face the first exhaust channel, the explosion-proof parts of all the cylindrical battery cells in a group of the battery cell subgroups located at the other end edge face the second exhaust channel, and the explosion-proof parts of all the cylindrical battery cells in the battery cell subgroups located in the middle part face the third exhaust channel.

[0021] In one embodiment, the bracket is provided with second arc grooves along the first direction, the number of which is equal to the number of the first arc grooves, and each of the second arc grooves extends along the second direction and is opposite to the first arc grooves one by one;

[0022] The cylindrical battery core is arranged in the second arc-shaped groove.

[0023] An electrical device comprises the battery pack as described above.

[0024] In the battery pack and power-consuming device mentioned above, the cylindrical battery cell is arranged in the first arc-shaped groove. The arrangement of the first arc-shaped groove facilitates the positioning of the cylindrical battery cell and also facilitates the efficient heat exchange between the cylindrical battery cell and the cold plate. Compared with the heat dissipation method of the serpentine tube wrapped around the outside of the cylindrical battery cell in the prior art, the accuracy of the assembly and positioning of the cylindrical battery cell is ensured, and the assembly efficiency of the battery pack is improved. At the same time, compared with the serpentine tube, the cold plate has fewer risk points of sealing failure. When a cooling channel is arranged in the cold plate for the flow of the cooling medium, it is not easy to cause leakage of the cooling medium, and the safety is relatively high. Moreover, in the present application, the bracket cooperates with the cold plate, and can cooperate with the cold plate to increase the rigidity of the entire structure while positioning the cylindrical battery cell through fewer components. The thermal runaway gas of the cylindrical battery cell can be guided to the exhaust channel through the explosion-proof part, and the thermal runaway gas is quickly exhausted through the exhaust channel to suppress the spread of heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A structural diagram of a battery pack provided in one embodiment of the present application;

[0026] Figure 2 for Figure 1 An exploded view of the battery pack shown in;

[0027] Figure 3 for Figure 1 The structural diagram of the cold plate of the battery pack shown in ;

[0028] Figure 4 for Figure 1 A structural diagram of a battery pack in which a cell group is mounted on a cold plate;

[0029] Figure 5 for Figure 4 A cross-sectional view of a section of the structure shown in ( Figure 5 The arrow in the middle represents the flow direction of the cooling medium);

[0030] Figure 6 for Figure 1 The layout of the battery pack shown in the cross-sectional view ( Figure 6 The middle arrow represents the flow direction of thermal runaway gas);

[0031] Figure 7 for Figure 4 A cross-sectional view of another cross section of the structure shown in ;

[0032] Figure 8 for Figure 7 A magnified view of the structure shown in FIG.

[0033] Fig. 9 for Figure 4 A cross-sectional view of another cross section of the structure shown in ;

[0034] Fig.10 A structural diagram of a cold plate of a battery pack provided in another embodiment of the present application ( Fig.10 The arrow in the middle represents the flow direction of the cooling medium);

[0035] Fig.11 A structural diagram of a cold plate of a battery pack provided in another embodiment of the present application ( Fig.11 The arrow in the middle represents the flow direction of the cooling medium);

[0036] Fig.12 for Figure 1 A structural diagram of the battery pack from another perspective shown in ;

[0037] Fig.13 A structural diagram of a battery pack provided in yet another embodiment of the present application;

[0038] Fig.14 for Fig.13 A structural diagram of the battery pack from another perspective shown in ;

[0039] Fig.15 for Fig.13 An exploded view of the battery pack shown in;

[0040] Fig.16 for Fig.13 A structural diagram of a battery pack in which a cell group is mounted on a cold plate;

[0041] Fig.17 for Figure 1 A structural diagram of a bracket of a battery pack as described in;

[0042] Fig.18 for Figure 1 The assembly diagram of the cold plate and bracket of the battery pack is shown in FIG.

[0043] Description of reference numerals:

[0044] 100, battery pack; 10, cold plate; 11, first arc groove; 12, first sub-plate; 121, first arc portion; 122, first straight portion; 13, second sub-plate; 131, second arc portion; 132, second straight portion; 14, cooling channel; 141, sub-channel; 15, inlet channel; 16, outlet channel; 17, plate body; 18, step portion; 20, battery cell group; 21, cylindrical battery cell; 211, explosion-proof portion ; 22. Battery cell subgroup; 30. Bracket; 31. Frame; 311. Recess; 32. Extension; 33. Second arc-shaped groove; 34. Connecting portion; 40. Exhaust channel; 40a. First exhaust channel; 40b. Second exhaust channel; 40c. Third exhaust channel; 41. Exhaust port; 50. Inlet connector; 60. Exhaust connector; 70. High and low pressure channels; X. First direction; Y. Second direction; Z. Third direction. DETAILED DESCRIPTION

[0045] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0046] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "top", "inside", "outside", etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying 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.

[0047] 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 this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0048] In this application, 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 connection; it can be a mechanical connection or an electrical connection; 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 this application can be understood according to specific circumstances.

[0049] In the present application, unless otherwise clearly specified and limited, a first feature "on" 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 "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.

[0050] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time. The term "on" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0051] See also Figure 1-Figure 3 , an embodiment of the present application provides a battery pack 100, including a cold plate 10, on which a plurality of first arc grooves 11 are arranged in an array in sequence along a first direction X, and each first arc groove 11 extends along a second direction Y. That is, the cold plate 10 is sequentially arranged with a plurality of first arc grooves 11 along the first direction X, and the extension direction of the plurality of first arc grooves 11 is the same, that is, they all extend along the second direction Y. The first direction X intersects with the second direction Y. Specifically, the first direction X is perpendicular to the second direction Y. In some specific embodiments, when the battery pack 100 is a rectangular plate-shaped structure, the first direction X is the length direction of the battery pack 100, and the second direction Y is the width direction of the battery pack 100. Of course, in some other specific embodiments, the shape of the battery pack 100 is not limited, and the specific directions of the first direction X and the second direction Y are also not limited.

[0052] See also Figure 4 and Figure 5The battery pack 100 also includes a cell group 20, which is disposed on a side of the cold plate 10 close to the first arc-shaped groove 11, that is, the cell group 20 is disposed on a side of the cold plate 10 having the first arc-shaped groove 11. The cell group 20 includes a plurality of cylindrical cells 21, and a cylindrical cell 21 is installed in each first arc-shaped groove 11. It should be noted that since the cylindrical cell 21 is installed in the first arc-shaped groove 11, and the first arc-shaped groove 11 extends along the second direction Y, the cylindrical cell 21 installed in the first arc-shaped groove 11 also extends along the second direction Y. The cylindrical cell 21 is in contact with the cold plate 10 for heat exchange, and the cold plate 10 is used to cool the cylindrical cell 21. Optionally, a cooling channel 14 for the cooling medium to flow is provided in the cold plate 10. When the cooling medium in the cooling system (a 50% by volume ethylene glycol aqueous solution may be selected) flows through the cooling channel 14, it can exchange heat with the cylindrical battery cell 21 through the cold plate 10 to cool the cylindrical battery cell 21. It is understood that in some other embodiments, the cold plate 10 may omit the cooling channel 14 and adopt other methods to cool the cylindrical battery cell 21, which is not limited here.

[0053] The number of cylindrical cells 21 installed in each first arc-shaped groove 11 is not limited. Figure 3 For example, in some embodiments, the number of cylindrical cells 21 installed in each first arc-shaped groove 11 is equal, and two cylindrical cells 21 are installed in each first arc-shaped groove 11, or four cylindrical cells 21 are installed in each first arc-shaped groove 11. In some other embodiments, the number of cylindrical cells 21 installed in each first arc-shaped groove 11 may be different, and the number of cylindrical cells 21 installed in each first arc-shaped groove 11 is not limited.

[0054] Preferably, the cylindrical battery cell 21 is arranged concentrically with the first arc-shaped groove 11. That is, the first arc-shaped groove 11 is arc-shaped, and the inner surface is conformed to the cylindrical battery cell 21, which can increase the contact area between the cylindrical battery cell 21 and the cold plate 10 and ensure the heat exchange effect. It should be understood that in some other embodiments, the shape of the first arc-shaped groove 11 is not limited.

[0055] See also Figure 6The battery pack 100 also includes a bracket 30, which is connected to the cold plate 10, and the battery cell group 20 is sandwiched between the cold plate 10 and the bracket 30. An exhaust channel 40 connected to the outside is formed between the bracket 30 and the cold plate 10, and the explosion-proof portion 211 of the cylindrical battery cell 21 is arranged toward the exhaust channel 40. Since the bracket 30 is connected to the cold plate 10, the bracket 30 and the cold plate 10 cooperate to position the cylindrical battery cell 21, thereby reducing the shaking of the cylindrical battery cell 21. At the same time, an exhaust channel 40 is formed between the bracket 30 and the cold plate 10, and the explosion-proof portion 211 of the cylindrical battery cell 21 faces the exhaust channel 40. When the cylindrical battery cell 21 thermally runs away, the thermal runaway gas flows to the exhaust channel 40 through the explosion-proof portion 211, and is quickly discharged through the exhaust channel 40, thereby suppressing the spread of heat.

[0056] In the battery pack 100 provided in the embodiment of the present application, the cylindrical battery cell 21 is arranged in the first arc groove 11. The arrangement of the first arc groove 11 facilitates the positioning of the cylindrical battery cell 21 and also facilitates the efficient heat exchange between the cylindrical battery cell 21 and the cold plate 10. Compared with the heat dissipation method of the serpentine tube wrapped around the outside of the cylindrical battery cell 21 in the prior art, the accuracy of the assembly and positioning of the cylindrical battery cell 21 is ensured. At the same time, compared with the serpentine tube, the cold plate 10 has fewer risk points of sealing failure. When a cooling channel 14 is arranged in the cold plate 10 for the flow of cooling medium, it is not easy to cause leakage of the cooling medium, and the safety is relatively high. In addition, in the present application, the bracket 30 cooperates with the cold plate 10, and can cooperate with the cold plate 10 to increase the rigidity of the entire structure while positioning the cylindrical battery cell 21 through fewer components. The thermal runaway gas of the cylindrical battery cell 21 can be guided to the exhaust channel 40 through the explosion-proof part 211, and the thermal runaway gas is quickly exhausted through the exhaust channel 40 to suppress the spread of heat.

[0057] In some embodiments, see Figure 7 and Figure 8 The cold plate 10 includes a first sub-plate 12 and a second sub-plate 13, the first sub-plate 12 and the second sub-plate 13 are connected along a third direction Z, and a cooling channel 14 for the cooling medium to flow is formed therebetween. The cold plate 10 includes a first sub-plate 12 and a second sub-plate 13, and the first sub-plate 12 and the second sub-plate 13 are layered in the third direction Z so as to form a cooling channel 14 in the cold plate 10, and the cooling medium can cool the cylindrical battery cell 21 when flowing through the cooling channel 14. Optionally, the cold plate 10 is prepared by a stamping and welding process or a hot rolling and inflation process, and the material of the cold plate 10 is generally 3 series or other series of aluminum metal.

[0058] The first direction X, the second direction Y, and the third direction Z intersect each other. Specifically, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. In some specific embodiments, the battery pack 100 is a rectangular plate structure, and the third direction Z is the thickness direction or height direction of the battery pack 100. In other specific embodiments, the third direction Z is different depending on the shape of the battery pack 100.

[0059] Further reading Figure 8 The cooling channel 14 includes a plurality of sub-channels 141, and the plurality of sub-channels 141 correspond to the first arc-shaped groove 11 one by one, and each sub-channel 141 extends along the second direction Y. The first sub-plate 12 includes a first arc-shaped portion 121 and a first straight portion 122 connected to each other, and the second sub-plate 13 includes a second arc-shaped portion 131 and a second straight portion 132 connected to each other. The first arc-shaped portion 121 corresponds to the second arc-shaped portion 131 one by one, and the first arc-shaped portion 121 is embedded in the second arc-shaped portion 131, and a sub-channel 141 is formed between the first arc-shaped portion 121 and the second arc-shaped portion 131, and the first arc-shaped groove 11 is formed on the first arc-shaped portion 121. The first straight portion 122 and the second straight portion 132 are fitted and fixed.

[0060] In the above arrangement, each first arc-shaped groove 11 corresponds to a sub-channel 141, and the cooling medium can flow through multiple sub-channels 141. When flowing through each sub-channel 141, the corresponding cylindrical battery cell 21 can be cooled through the first arc-shaped portion 121, thereby ensuring the cooling effect. At the same time, the first sub-plate 12 and the second sub-plate 13 are fixed together by the first straight portion 122 and the second straight portion 132, thereby ensuring the fixing effect of the first sub-plate 12 and the second sub-plate 13.

[0061] Optionally, the first straight portion 122 and the second straight portion 132 are fixed by welding, gluing or hot rolling, such as a conventional tunnel furnace brazing process, and the width of the welding area d ≥ 5 mm, which ensures the fixing effect of the first sub-plate 12 and the second sub-plate 13. The cylindrical battery cell 21 is glued and fixed to the cold plate 10 to prevent the cylindrical battery cell 21 from shifting in the first arc groove 11. Specifically, the cylindrical battery cell 21 is fixed to the cold plate 10 by structural glue, thermal conductive structural glue or double-sided glue, and the structural glue is generally a polyurethane or acrylic system.

[0062] See also Fig. 9 The first sub-plate 12 and the second sub-plate 13 also form an inlet channel 15 for the cooling medium to enter the cold plate 10 and an outlet channel 16 for the cooling medium to flow out of the cold plate 10 along the first direction X, and each sub-channel 141 is connected to the inlet channel 15 and the outlet channel 16. In this way, the cooling medium can flow to each sub-channel 141 through the inlet channel 15, and the cooling medium flows to the outlet channel 16 after heat exchange with the cylindrical battery cell 21 in the sub-channel 141, and then recirculates to the inlet channel 15, and circulates back and forth to cool the cylindrical battery cell 21.

[0063] In some specific embodiments, the cold plate 10 has an inlet channel 15 and an outlet channel 16, the inlet channel 15 is located at one end of the sub-channel 141 in the second direction Y, and the outlet channel 16 is located at the other end of the sub-channel 141. In this case, the cold plate 10 is in a single-inlet and single-outlet form. The battery pack 100 also includes an inlet connector 50 and an outlet connector 60 connected to the cold plate 10, the cooling medium flows to the inlet channel 15 through the inlet connector 50, and the cooling medium in the outlet channel 16 is discharged through the outlet connector 60.

[0064] In some other specific embodiments, see Fig.10 , the cold plate 10 may also have an inlet channel 15 and multiple outlet channels 16, such as one inlet channel 15 and two outlet channels 16. In this case, each sub-channel 141 includes a first portion and a second portion, the inlet channel 15 is located between the first portion and the second portion in the second direction Y, and the two outlet channels 16 are located at one end of the first portion and the second portion away from each other. The cooling medium flows through the inlet channel 15 to the first portion and the second portion of each sub-channel 141, the cooling medium in the first portion is discharged through one outlet channel 16, and the cooling medium in the second portion is discharged through another outlet channel 16.

[0065] In some other embodiments, see Fig.11 The cold plate 10 may also have a plurality of inlet channels 15 and one outlet channel 16, such as two inlet channels 15 and one outlet channel 16. In this case, each sub-channel 141 includes a first portion and a second portion, the outlet channel 16 is located between the first portion and the second portion in the second direction Y, and the two inlet channels 15 are located at one end of the first portion and the second portion away from each other in the second direction Y. The cooling medium flows to the first portion and the second portion of the sub-channel 141 through the two inlet channels 15, and the cooling medium in the first portion and the second portion is discharged through the outlet channel 16 together.

[0066] The above-mentioned one-in-multiple-out or multiple-in-one-out approach can meet the requirements of a battery pack 100 with a larger specification when an integrated cold plate 10 is used, and can reduce the number of cold plates 10 .

[0067] In some embodiments, the inlet channel 15 and the outlet channel 16 may be arranged in other ways, as long as the cooling medium can flow to the sub-channel 141 through the inlet channel 15 and flow to the outlet channel 16 through the sub-channel 141 for discharge.

[0068] In some embodiments, see Fig.12The bracket 30 includes a frame body 31 and two extensions 32 respectively located at both ends of the frame body 31 along the second direction Y. The cold plate 10 includes a plate body 17 and two step portions 18 respectively located at both ends of the plate body 17 along the second direction Y. The step portion 18 and the plate body 17 are arranged in a step-like manner, and the step portion 18 is away from the extension portion 32 relative to the plate body 17 in the third direction Z. Among them, the first arc groove 11 is provided on the plate body 17, and the battery cell group 20 is provided between the plate body 17 and the frame body 31. Each extension portion 32 corresponds to a step portion 18, and forms an exhaust channel 40 extending along the first direction X. The two exhaust channels 40 are respectively a first exhaust channel 40a and a second exhaust channel 40b. The explosion-proof portion 211 of the partial cylindrical battery cell 21 faces the first exhaust channel 40a, and the explosion-proof portion 211 of the partial cylindrical battery cell 21 faces the second exhaust channel 40b.

[0069] The above arrangement avoids occupying the space of the plate body 17 and the frame body 31, and further avoids occupying the space of the plate body 17 where the first arc groove 11 is set, because the first exhaust channel 40a and the second exhaust channel 40b are formed by the extension portion 32 and the step portion 18, so that the first arc groove 11 can install more cylindrical battery cells 21 along the second direction Y to cool more cylindrical battery cells 21.

[0070] In some specific implementations, please refer to Fig. 9 and Fig.12 The battery cell group 20 includes two groups of battery cell subgroups 22 arranged in the second direction Y, and each group of battery cell subgroups 22 includes a plurality of cylindrical battery cells 21 arranged along the first direction X. The explosion-proof portion 211 of one group of battery cell subgroups 22 faces the first exhaust passage 40a, and the explosion-proof portion 211 of the other group of battery cell subgroups 22 faces the second exhaust passage 40b.

[0071] For further information, see Fig.13 and Fig.14 At least one third exhaust channel 40c extending along the first direction X is formed between the frame 31 and the plate body 17, and an exhaust port 41 is formed at at least one end of the third exhaust channel 40c in the first direction X. It should be noted here that the exhaust ports 41 of the first exhaust channel 40a and the second exhaust channel 40b are also arranged at at least one end thereof in the first direction X. The explosion-proof parts 211 of some cylindrical battery cells 21 face the third exhaust channel 40c. In this way, some cylindrical battery cells 21 are exhausted through the first exhaust channel 40a, other cylindrical battery cells 21 are exhausted through the second exhaust channel 40b, and other cylindrical battery cells 21 are exhausted through the third exhaust channel 40c, so as to facilitate the exhaust of thermal runaway gases of each cylindrical battery cell 21 and prevent heat from spreading.

[0072] Optionally, see Fig.15The frame 31 has a recessed portion 311 recessed away from the plate 17, and a third exhaust channel 40c is formed between the recessed portion 311 and the plate 17. It should be understood that in some other embodiments, the formation method of the third exhaust channel 40c is not limited, for example, the groove wall of the first arc groove 11 may also have a missing portion, and the third exhaust channel 40c is formed between the missing portion and the frame 31.

[0073] Optionally, see Fig.13 and Fig.16 The battery cell group 20 includes multiple groups of battery cell subgroups 22 arranged in sequence along the second direction Y, and each group of battery cell subgroups 22 includes multiple cylindrical battery cells 21 arranged along the first direction X. In the second direction Y, the explosion-proof parts 211 of all cylindrical battery cells 21 of a group of battery cell subgroups 22 located at one end edge face the first exhaust channel 40a, the explosion-proof parts 211 of all cylindrical battery cells 21 of a group of battery cell subgroups 22 located at the other end edge face the second exhaust channel 40b, and the explosion-proof parts 211 of all cylindrical battery cells 21 of the battery cell subgroups 22 located in the middle part face the third exhaust channel 40c. Such an exhaust channel 40 corresponds to at least one group of battery cell subgroups 22, which can reduce the number of exhaust channels 40.

[0074] Furthermore, the explosion-proof parts 211 of all the cylindrical cells 21 of the two adjacent groups of cell sub-groups 22 located in the middle portion face the same third exhaust channel 40c. In this way, the two groups of cell sub-groups 22 share a third exhaust channel 40c, which can further reduce the number of exhaust channels 40 and reduce the volume of the battery pack 100.

[0075] In some embodiments, see Fig.17 and Fig.18 The bracket 30 is provided with second arc grooves 33 along the first direction X, the number of which is equal to the first arc grooves 11. Specifically, the second arc grooves 33 are provided on the bracket body 31. Each second arc groove 33 extends along the second direction Y and is opposite to the first arc groove 11 one by one. The cylindrical battery cell 21 is provided in the second arc groove 33. In this way, the cylindrical battery cell 21 is accommodated in the accommodation space formed by the first arc groove 11 and the second arc groove 33, that is, the two ends of the cylindrical battery cell 21 in the third direction Z are respectively limited in the first arc groove 11 and the second arc groove 33, thereby ensuring the positioning effect of the cylindrical battery cell 21.

[0076] Optionally, the second arc-shaped groove 33 is the same as the first arc-shaped groove 11 , and both are adapted to the shape of the cylindrical battery cell 21 , so that the cylindrical battery cell 21 can be exactly accommodated in the arc-shaped groove.

[0077] In some embodiments, continue to refer to Figure 1The frame 31 is connected with a connecting portion 34, and the connecting portion 34 is connected to the plate body 17 by screws. Of course, in some other embodiments, the bracket 30 can also be connected to the cold plate 10 by other means, such as being connected to the cold plate 10 by a buckle.

[0078] Optionally, a back glue or glue coating area may be provided on the frame 31 to bond with the bonding area of ​​the board 17. Specifically, the bonding area of ​​the board 17 is formed on the first straight portion 122 of the first sub-board 12, and the back glue or glue coating area on the frame 31 is opposite to the first straight portion 122.

[0079] Continue reading Fig.12 A high- and low-pressure channel 70 is also formed between the frame 31 and the plate body 17. The electrode ends of the cylindrical battery cells 21 face the high- and low-pressure channels 70. The high- and low-pressure channels 70 facilitate the lead-out of wires connected to the electrode ends, so that the electrodes of the cylindrical battery cells 21 can be electrically connected to external high- and low-voltage components.

[0080] Another embodiment of the present application further provides an electric device, including the above-mentioned battery pack 100. Optionally, the electric device is a vehicle, which can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle.

[0081] For pure electric vehicles, the battery pack 100 can be used as a driving power source to replace fossil fuels to provide driving power.

[0082] In other embodiments, there is no limitation on the types of electrical devices, such as electrical devices may also be ships, spacecraft, electric toys, electric tools, energy storage equipment, amusement equipment, elevators and lifting equipment, etc. Spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys or electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.; energy storage equipment may be energy storage walls, base station energy storage, container energy storage, etc.; amusement equipment may be carousels, bungee jumping machines, etc. This application does not impose any special restrictions on the above-mentioned electrical devices.

[0083] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0084] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A battery pack, characterized in that: include: A cold plate (10) is provided with a plurality of first arc-shaped grooves (11) arranged in an array in sequence along a first direction (X), and each of the first arc-shaped grooves (11) extends along a second direction (Y); A battery cell group (20) is arranged on a side of the cold plate (10) close to the first arc-shaped groove (11), and the battery cell group (20) comprises a plurality of cylindrical battery cells (21), each of the first arc-shaped grooves (11) being installed with the cylindrical battery cell (21); A bracket (30) connected to the cold plate (10), the battery cell group (20) being sandwiched between the cold plate (10) and the bracket (30); an exhaust passage (40) communicating with the outside is formed between the bracket (30) and the cold plate (10), and the explosion-proof portion (211) of the cylindrical battery cell (21) is arranged toward the exhaust passage (40); The cold plate (10) comprises a first sub-plate (12) and a second sub-plate (13); the first sub-plate (12) and the second sub-plate (13) are connected along a third direction (Z), and a cooling channel (14) is formed between the first sub-plate (12) and the second sub-plate (13) for the cooling medium to flow; The cooling flow channel (14) comprises a plurality of sub-flow channels (141) corresponding one-to-one to the first arc-shaped grooves (11) and extending along the second direction (Y); The first sub-plate (12) comprises a first arc-shaped portion (121) and a first straight portion (122) connected to the first arc-shaped portion (121); the second sub-plate (13) comprises a second arc-shaped portion (131) and a second straight portion (132) connected to the second arc-shaped portion (131); the first arc-shaped portion (121) corresponds to the second arc-shaped portion (131) in a one-to-one manner; the first arc-shaped portion (121) is embedded in the corresponding second arc-shaped portion (131) and the two form a sub-flow channel (141); the first arc-shaped groove (11) is formed on the first arc-shaped portion (121); the first straight portion (122) and the second straight portion (132) are fitted and fixed; The bracket (30) comprises a frame body (31) and two extension portions (32) respectively located at two ends of the frame body (31) along the second direction (Y); the cold plate (10) comprises a plate body (17) and two step portions (18) respectively located at two ends of the plate body (17) along the second direction (Y) and arranged in a stepped manner with the plate body (17); the first arc groove (11) is arranged on the plate body (17); the battery cell group (20) is arranged between the plate body (17) and the frame body (31); each of the extension portions (32) corresponds to one of the step portions (18), and forms an exhaust passage (40) extending along the first direction (X).

2. The battery pack according to claim 1, characterized in that: An inlet flow channel (15) for a cooling medium to enter the cold plate (10) and an outlet flow channel (16) for a cooling medium to flow out of the cold plate (10) are also formed between the first sub-plate (12) and the second sub-plate (13) along the first direction (X), and each of the sub-flow channels (141) is connected to the inlet flow channel (15) and the outlet flow channel (16).

3. The battery pack according to claim 1, characterized in that: The two exhaust passages (40) are respectively a first exhaust passage (40a) and a second exhaust passage (40b); The explosion-proof parts (211) of some of the cylindrical battery cores (21) face the first exhaust channel (40a), and the explosion-proof parts (211) of some of the cylindrical battery cores (21) face the second exhaust channel (40b).

4. The battery pack according to claim 3, characterized in that: At least one third exhaust channel (40c) extending along the first direction (X) is formed between the frame (31) and the plate (17), and an exhaust port (41) is formed at at least one end of the third exhaust channel (40c) in the first direction (X); The explosion-proof portion (211) of a portion of the cylindrical battery core (21) faces the third exhaust channel (40c).

5. The battery pack according to claim 4, characterized in that: The frame (31) has a recessed portion (311) recessed away from the plate body (17), and the third exhaust channel (40c) is formed between the recessed portion (311) and the plate body (17).

6. The battery pack according to claim 4, characterized in that: The battery cell group (20) comprises a plurality of groups of battery cell subgroups (22) arranged in sequence along the second direction (Y), and each group of the battery cell subgroups (22) comprises a plurality of the cylindrical battery cells (21) arranged along the first direction (X); In the second direction (Y), the explosion-proof parts (211) of all the cylindrical cells (21) of a group of the cell subgroups (22) located at one end edge face the first exhaust channel (40a), the explosion-proof parts (211) of all the cylindrical cells (21) of a group of the cell subgroups (22) located at the other end edge face the second exhaust channel (40b), and the explosion-proof parts (211) of all the cylindrical cells (21) of the cell subgroups (22) located in the middle portion face the third exhaust channel (40c).

7. The battery pack according to claim 1, characterized in that: The bracket (30) is provided with second arc grooves (33) equal in number to the first arc grooves (11) along the first direction (X), and each of the second arc grooves (33) extends along the second direction (Y) and is opposite to the first arc grooves (11) one by one; The cylindrical battery core (21) is arranged in the second arc-shaped groove (33).

8. An electrical device, characterized in that: Comprising a battery pack as described in any one of claims 1 to 7.

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