Battery pack and electric device

Abstract

The invention discloses a battery pack and an electric device, and relates to the technical field of batteries. The battery pack comprises a first direction, a second direction and a third direction which are perpendicular to each other in pairs. The battery pack comprises a box body, a plurality of battery packs and a liquid cooling pipe group. The box body has an accommodating cavity; the plurality of battery packs extend along the second direction and are arranged in the accommodating cavity along the first direction; the liquid cooling pipe group comprises a liquid inlet pipe and a liquid outlet pipe, and the plurality of battery packs are respectively communicated with the liquid inlet pipe and the liquid outlet pipe; wherein the battery pack comprises a shell assembly and a plurality of single batteries, the plurality of single batteries are arranged in the shell assembly along a second direction, gaps are formed between the single batteries and the inner wall of the shell assembly, and the liquid inlet pipe and the liquid outlet pipe are respectively communicated with the gaps. According to the battery pack provided by the invention, the energy density and the thermal management capability of the battery pack are effectively improved.

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] With the continuous development of the new energy vehicle industry, current new energy vehicles have increasingly higher requirements for endurance and fast charging capabilities, that is, increasingly higher requirements for the energy density and thermal management capabilities of power batteries.

[0003] In the related art, in order to improve the thermal management capability of the battery pack, liquid cooling plates are usually installed on both side walls and the bottom wall of the single battery. On the one hand, the number and space occupied by the liquid cooling plates increase, resulting in a decrease in the energy density of the battery pack. On the other hand, the coolant flowing through the liquid cooling plates needs to absorb the heat of the single battery through the liquid cooling plates, and the heat transfer efficiency is low, resulting in low cooling efficiency. Summary of the invention

[0004] In order to achieve the above-mentioned purpose, the present application is based on this, and the purpose of the present application is to provide a battery pack, aiming to solve the technical problem in the prior art that liquid cooling plates are set on both side walls and bottom walls of the single battery to improve the thermal management capability of the battery pack, resulting in reduced energy density of the battery pack and low cooling efficiency.

[0005] The technical solutions adopted are as follows:

[0006] In a first aspect, an embodiment of the present application provides a battery pack, wherein the battery pack has a first direction, a second direction, and a third direction that are perpendicular to each other, and the battery pack includes:

[0007] A box body having a containing cavity;

[0008] A plurality of battery packs, each of the plurality of battery packs extends along the second direction, and the plurality of battery packs are arranged in the accommodation cavity along the first direction;

[0009] A liquid cooling pipe group, the liquid cooling pipe group comprising a liquid inlet pipe and a liquid outlet pipe, and the plurality of battery packs are respectively connected to the liquid inlet pipe and the liquid outlet pipe;

[0010] Wherein, the battery pack includes a shell assembly and multiple single cells, the multiple single cells are arranged in the shell assembly along the second direction, there is a gap between the single cells and the inner wall of the shell assembly, and the liquid inlet pipe and the liquid outlet pipe are respectively connected to the gap.

[0011] In one embodiment of the first aspect, the liquid inlet pipe includes a liquid inlet main path and a plurality of liquid inlet branches, the liquid inlet main path extends along the first direction and is arranged at one end of the plurality of battery packs along the second direction, the plurality of liquid inlet branches are arranged at intervals along the first direction, and each of the liquid inlet branches is respectively connected to the liquid inlet main path and one end of the shell assembly along the second direction;

[0012] The liquid outlet pipe includes a main liquid outlet path and multiple liquid outlet branches. The main liquid outlet path extends along the first direction and is arranged at one end of the multiple battery packs along the second direction away from the main liquid inlet path. The multiple liquid outlet branches are arranged at intervals along the first direction, and each of the liquid outlet branches is respectively connected to the main liquid outlet path and one end of the shell component along the second direction away from the main liquid inlet path.

[0013] In one embodiment of the first aspect, a first connecting pipe is provided at one end of the shell assembly close to the liquid inlet main path along the second direction, and the liquid inlet branch is connected to the shell assembly through the first connecting pipe;

[0014] A second connecting pipe is provided at one end of the shell component close to the liquid outlet main path along the second direction, and the liquid outlet branch is connected to the shell component through the second connecting pipe.

[0015] In one of the embodiments of the first aspect, the shell assembly includes a shell and a cover body, the shell is provided with a receiving groove, the cover body covers the notch of the receiving groove, the receiving groove has a bottom wall opposite to the notch and a first side wall oppositely arranged along the first direction, the single cells are arranged at intervals along the second direction, the single cells are connected to the bottom wall of the receiving groove, the gap is provided between the single cells and the first side wall of the receiving groove, the single cells are provided with a pole ear assembly, the cover body is provided with a pole column assembly, and the pole ear assembly is electrically connected to the pole column assembly at one end close to the cover body along the third direction.

[0016] In one embodiment of the first aspect, the coolant transported by the liquid inlet pipe is an insulating heat-conducting medium.

[0017] In one of the embodiments of the first aspect, the single cell battery includes a single cell battery housing, an insulating member and an electrode assembly, the insulating member covers the single cell battery housing, the electrode assembly is located in the single cell battery housing, and the electrode assembly is provided with the pole lug assembly at one end close to the cover body along the third direction, the pole lug assembly is penetrated through the single cell battery housing and the insulating member and is electrically connected to the pole column assembly.

[0018] In one of the embodiments of the first aspect, a side of the single cell facing away from the tab assembly is connected to the bottom wall of the receiving groove, and along the third direction, a depth of the receiving groove is H1 mm, and a height of the single cell is H2 mm, satisfying the relationship: 0.5≤H2 / H1≤0.95.

[0019] In one embodiment of the first aspect, the single cell is located in the middle of the receiving groove along the first direction, and along the first direction, the groove width of the receiving groove is W1mm, and the maximum width of the single cell is W2mm, satisfying the relationship: 0.5≤W2 / W1≤0.95.

[0020] In one embodiment of the first aspect, along the second direction, the accommodating groove has a second side wall oppositely arranged along the second direction, and a distance D1 between a single battery adjacent to the second side wall and the second side wall satisfies: 0mm<D1≤20mm.

[0021] In one embodiment of the first aspect, along the second direction, two adjacent single cells are spaced apart, and a distance D2 between two adjacent single cells satisfies: 0 mm<D2≤10 mm.

[0022] In a second aspect, an embodiment of the present application further provides an electrical device, comprising the battery pack described in any of the above embodiments.

[0023] The beneficial effects of the present application are as follows: the present application proposes a battery pack, which includes a case, a plurality of battery packs and a liquid cooling tube group, the liquid cooling tube group includes a liquid inlet pipe and a liquid outlet pipe, and the battery pack includes a shell assembly and a plurality of single cells. The case has a housing cavity, and the plurality of battery packs extend along the second direction and are arranged in the housing cavity along the first direction. By connecting the plurality of battery packs to the liquid inlet pipe and the liquid outlet pipe respectively, the coolant can flow through the plurality of battery packs at the same time, thereby cooling the plurality of battery packs at the same time, effectively reducing the temperature difference between the battery packs, and facilitating the improvement of the cycle performance and service life of the single cells. At the same time, by arranging the plurality of single cells in the shell assembly along the second direction, and providing a gap between the single cells and the inner wall of the shell assembly, and connecting the liquid inlet pipe and the liquid outlet pipe to the gap respectively. In this way, the coolant can flow into the shell assembly along the liquid inlet pipe, and flow through the gaps between the multiple single cells and the inner wall of the shell assembly in turn, so as to absorb the heat generated by the charging and discharging of the multiple single cells in turn, and finally flow out of the shell assembly through the liquid outlet pipe. After the coolant leaves the shell assembly, this part of the heat is taken away from the battery pack, thereby achieving rapid cooling of the multiple single cells.

[0024] The battery pack provided by the present application uses a shell assembly as a carrier of a single cell and a coolant, which can not only increase the contact area between the coolant and the single cell to improve the thermal management capability of the battery pack, but also eliminate the liquid cooling plate in the prior art to improve space utilization, thereby improving the energy density of the battery pack. On the other hand, the coolant can directly contact the single cell, effectively improving the heat transfer efficiency, thereby improving the cooling efficiency, and further improving the thermal management capability of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A three-dimensional schematic diagram of a battery pack in some embodiments of the present application is shown;

[0027] Figure 2 An exploded schematic diagram of a battery pack in some embodiments of the present application is shown;

[0028] Figure 3 A three-dimensional schematic diagram showing a battery pack without a box in some embodiments of the present application is shown;

[0029] Figure 4 Shows Figure 3 A magnified schematic diagram of the structure of the middle A section;

[0030] Figure 5 A three-dimensional schematic diagram of a liquid cooling tube group in some embodiments of the present application is shown;

[0031] Figure 6 A three-dimensional schematic diagram of a battery pack in some embodiments of the present application is shown;

[0032] Figure 7 A schematic top view of a battery pack without a cover in some embodiments of the present application is shown;

[0033] Figure 8 Shows Figure 7 A magnified schematic diagram of the structure of the middle B section;

[0034] Fig. 9 A schematic cross-sectional view of a battery pack in some embodiments of the present application is shown;

[0035] Fig.10 Shows Fig. 9 Enlarged schematic diagram of the structure of section C in the middle.

[0036] Description of main component symbols:

[0037] 100-battery pack;

[0038] 110-box; 111-accommodating chamber;

[0039] 120-battery pack; 121-shell assembly; 1211-shell; 12111-accommodation groove; 121111-bottom wall; 121112-first side wall; 121113-second side wall; 1212-cover; 12121-pole column assembly; 1213-first connecting pipe; 1214-second connecting pipe; 122-monocell; 1221-pole ear assembly; 1222-insulating member;

[0040] 130-liquid cooling pipe group; 131-liquid inlet pipe; 1311-liquid inlet main line; 1312-liquid inlet branch line; 132-liquid outlet pipe; 1321-liquid outlet main line; 1322-liquid outlet branch line;

[0041] X-first direction;

[0042] Y-second direction;

[0043] Z - third direction. DETAILED DESCRIPTION

[0044] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0045] 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 referred device or element 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.

[0046] 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0047] 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. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0048] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0049] like Figure 1 and Figure 2 As shown, the embodiment of the present application provides a battery pack 100, which is mainly used in electrical devices. The battery pack 100 has a first direction X, a second direction Y and a third direction Z that are perpendicular to each other, and the battery pack 100 includes: a box 110, a plurality of battery packs 120 and a liquid cooling tube group 130.

[0050] The first direction X may be a length direction of the battery pack 100 , the second direction Y may be a width direction of the battery pack 100 , and the third direction Z may be a thickness direction of the battery pack 100 .

[0051] The box body 110 has a receiving cavity 111, and the plurality of battery packs 120 extend along the second direction Y. The plurality of battery packs 120 are arranged in the receiving cavity 111 along the first direction X. The liquid cooling pipe group 130 includes a liquid inlet pipe 131 and a liquid outlet pipe 132, and the plurality of battery packs 120 are respectively connected to the liquid inlet pipe 131 and the liquid outlet pipe 132.

[0052] See also Figure 6 , Figure 7 and Fig. 9 The battery pack 120 includes a shell assembly 121 and a plurality of single cells 122, wherein the plurality of single cells 122 are arranged in the shell assembly 121 along the second direction Y, and there is a gap between the single cells 122 and the inner wall of the shell assembly 121, and the liquid inlet pipe 131 and the liquid outlet pipe 132 are respectively connected to the gap.

[0053] The battery pack 100 provided in the embodiment of the present application connects multiple battery groups 120 to the liquid inlet pipe 131 and the liquid outlet pipe 132 respectively, so that the coolant can flow through the multiple battery groups 120 at the same time, thereby cooling the multiple battery groups 120 at the same time, effectively reducing the temperature difference between the battery groups 120, which is beneficial to improving the cycle performance and service life of the single battery 122.

[0054] At the same time, by arranging a plurality of single cells 122 in the shell assembly 121 along the second direction Y, and a gap is provided between the single cells 122 and the inner wall of the shell assembly 121, and the liquid inlet pipe 131 and the liquid outlet pipe 132 are respectively connected to the gap. In this way, the coolant can flow into the shell assembly 121 along the liquid inlet pipe 131, and sequentially flow through the gaps between the plurality of single cells 122 and the inner wall of the shell assembly 121, so as to sequentially absorb the heat generated by the charging and discharging of the plurality of single cells 122, and finally flow out of the shell assembly 121 through the liquid outlet pipe 132. After the coolant leaves the shell assembly 121, this part of the heat is taken away from the battery pack 120, so as to achieve rapid cooling of the plurality of single cells 122.

[0055] The battery pack 100 provided in the present application uses the shell assembly 121 as a carrier of the single battery 122 and the coolant, which can increase the contact area between the coolant and the single battery 122 to improve the thermal management capability of the battery pack 100, and can also omit the liquid cooling plate in the prior art to improve the space utilization, thereby improving the energy density of the battery pack 100. On the other hand, the coolant can directly contact the single battery 122, effectively improving the heat transfer efficiency, thereby improving the cooling efficiency, and further improving the thermal management capability of the battery pack 100.

[0056] like Figure 3 , Figure 4 and Figure 5As shown, in one embodiment of the present application, the liquid inlet pipe 131 includes a main liquid inlet path 1311 and a plurality of liquid inlet branches 1312, the main liquid inlet path 1311 extends along the first direction X and is arranged at one end of the plurality of battery packs 120 along the second direction Y, the plurality of liquid inlet branches 1312 are arranged at intervals along the first direction X, and each of the liquid inlet branches 1312 is respectively connected to the main liquid inlet path 1311 and one end of the shell assembly 121 along the second direction Y. The liquid outlet pipe 132 includes a main liquid outlet path 1321 and a plurality of liquid outlet branches 1322, the main liquid outlet path 1321 extending along the first direction X and arranged at one end of the plurality of battery packs 120 away from the main liquid inlet path 1311 along the second direction Y, the plurality of liquid outlet branches 1322 are arranged at intervals along the first direction X, and each of the liquid outlet branches 1322 is respectively connected to the main liquid outlet path 1321 and one end of the shell assembly 121 away from the main liquid inlet path 1311 along the second direction Y.

[0057] In this embodiment, the main liquid inlet path 1311 is extended along the first direction X to one end of the plurality of battery packs 120 along the second direction Y, and the plurality of liquid inlet branches 1312 are spaced apart along the first direction X, and each liquid inlet branch 1312 is respectively connected to the main liquid inlet path 1311 and one end of a shell assembly 121 along the second direction Y. In this way, the coolant in the main liquid inlet path 1311 can flow into the shell assemblies 121 of the plurality of battery packs 120 through the plurality of liquid inlet branches 1312, thereby cooling the plurality of battery packs 120 at the same time, effectively reducing the temperature difference between the battery packs 120, and facilitating the improvement of the cycle performance and service life of the single battery 122.

[0058] At the same time, the liquid outlet main path 1321 is extended along the first direction X to be arranged at one end of the plurality of battery packs 120 away from the liquid inlet main path 1311 along the second direction Y, and the plurality of liquid outlet branch paths 1322 are arranged at intervals along the first direction X, and each liquid outlet branch path 1322 is respectively connected to the liquid outlet main path 1321 and one end of a shell assembly 121 away from the liquid inlet main path 1311 along the second direction Y. In this way, the cooling liquid after absorbing heat in the shell assembly 121 of the plurality of battery packs 120 can flow out of the shell assembly 121 through the plurality of liquid outlet branch paths 1322, and converge to the liquid outlet main path 1321, and finally flow out of the battery pack 100 through the liquid outlet main path 1321, so as to take the absorbed heat away from the battery pack 100, and realize rapid cooling of the plurality of single cells 122.

[0059] For example, the main liquid inlet path 1311 and the plurality of liquid inlet branches 1312 can be made by injection molding, and the liquid inlet branches 1312 and the shell assembly 121 can be connected by plugging. The main liquid outlet path 1321 and the plurality of liquid outlet branches 1322 can be made by injection molding, and the liquid outlet branches 1322 and the shell assembly 121 can be connected by plugging.

[0060] like Figure 4 , Figure 6 and Figure 7 As shown, in the above embodiment of the present application, the shell component 121 is provided with a first connecting pipe 1213 at one end close to the liquid inlet main path 1311 along the second direction Y, and the liquid inlet branch 1312 is communicated with the shell component 121 through the first connecting pipe 1213. The shell component 121 is provided with a second connecting pipe 1214 at one end close to the liquid outlet main path 1321 along the second direction Y, and the liquid outlet branch 1322 is communicated with the shell component 121 through the second connecting pipe 1214.

[0061] In this embodiment, a first connecting pipe 1213 is provided at one end of the shell assembly 121 close to the liquid inlet main path 1311 along the second direction Y, and a liquid inlet branch 1312 is provided to communicate with the shell assembly 121 through the first connecting pipe 1213, so that the coolant in the liquid inlet branch 1312 can flow into the shell assembly 121 through the liquid inlet branch 1312 and the first connecting pipe 1213 in sequence. At the same time, a second connecting pipe 1214 is provided at one end of the shell assembly 121 close to the liquid outlet main path 1321 along the second direction Y, and a liquid outlet branch 1322 is provided to communicate with the shell assembly 121 through the second connecting pipe 1214, so that the coolant after absorbing heat in the shell assembly 121 can flow to the liquid outlet main path 1321 through the second connecting pipe 1214 and the liquid outlet branch 1322 in sequence.

[0062] Exemplarily, the first connecting pipe 1213 and the shell assembly 121 can be connected by plugging or integrally formed by injection molding, and the liquid inlet branch 1312 and the first connecting pipe 1213 can be connected by plugging. The second connecting pipe 1214 and the shell assembly 121 can be connected by plugging or integrally formed by injection molding, and the liquid outlet branch 1322 and the second connecting pipe 1214 can be connected by plugging.

[0063] like Figures 6 to 10As shown, in any of the above embodiments of the present application, the shell assembly 121 includes a shell 1211 and a cover 1212, the shell 1211 is provided with a receiving groove 12111, the cover 1212 is sealed at the notch of the receiving groove 12111, the receiving groove 12111 has a bottom wall 121111 opposite to the notch and a first side wall 121112 oppositely arranged along the first direction X, the single battery 122 is arranged at intervals along the second direction Y, The single cell 122 is connected to the bottom wall 121111 of the accommodating groove 12111, and there is the gap between the single cell 122 and the first side wall 121112 of the accommodating groove 12111, a pole ear assembly 1221 is arranged on the single cell 122, and a pole column assembly 12121 is arranged on the cover body 1212, and the pole ear assembly 1221 is electrically connected to the pole column assembly 12121 at one end close to the cover body 1212 along the third direction Z.

[0064] In this embodiment, multiple single cells 122 are connected to the bottom wall 121111 of the receiving groove 12111 at intervals along the second direction Y, and the connection method can be bonding. In this way, on the one hand, expansion space can be reserved for the single cells 122 in the second direction Y, thereby avoiding structural interference caused by the expansion of two adjacent single cells 122. On the other hand, both sides of the single cells 122 along the second direction Y can be in contact with the coolant, thereby further increasing the contact area between the coolant and the single cells 122, thereby further improving the thermal management capability of the battery pack 100.

[0065] By providing a gap between the single battery 122 and the first side wall 121112 of the receiving groove 12111, on the one hand, expansion space can be reserved for the single battery 122 in the first direction X, thereby avoiding structural interference between the single battery 122 and the first side wall 121112. On the other hand, both sides of the single battery 122 along the first direction X can contact with the coolant flowing through the gap, thereby further increasing the contact area between the coolant and the single battery 122, thereby further improving the thermal management capability of the battery pack 100.

[0066] By respectively arranging a pole ear assembly 1221 and a pole column assembly 12121 on the single battery 122 and the cover body 1212, and electrically connecting one end of the pole ear assembly 1221 close to the cover body 1212 along the third direction Z to the pole column assembly 12121, the single battery 122 can be charged and discharged under the action of the electrical connection between the pole column assembly 12121 and the pole ear assembly 1221.

[0067] In the above-mentioned embodiment of the present application, the coolant transported by the liquid inlet pipe 131 is an insulating heat-conducting medium.

[0068] In this embodiment, the coolant delivered by the liquid inlet pipe 131 is an insulating heat-conducting medium, so that on the one hand, heat exchange can be performed with the single battery 122 under the heat conduction effect of the insulating heat-conducting medium, thereby absorbing the heat generated by the single battery 122. On the other hand, the coolant can be prevented from being electrically connected to the tab assembly 1221 under the insulation effect of the insulating heat-conducting medium, thereby effectively improving safety.

[0069] Exemplarily, the material of the insulating heat-conducting medium may be mineral oil, silicone oil, esters, hydrofluoroether, etc.

[0070] like Figure 8 , Fig. 9 and Fig.10 As shown, in the above-mentioned embodiment of the present application, the single cell 122 includes a single cell housing, an insulating member 1222 and an electrode assembly, the insulating member 1222 covers the single cell housing, the electrode assembly is located in the single cell housing, and the electrode assembly is provided with the pole ear assembly 1221 at one end of the electrode assembly along the third direction Z close to the cover body 1212, and the pole ear assembly 1221 is penetrated through the single cell housing and the insulating member 1222 and is electrically connected to the pole column assembly 12121.

[0071] In this embodiment, a pole ear assembly 1221 is provided at one end of the electrode assembly close to the cover body 1212 along the third direction Z, and the pole ear assembly 1221 is passed through the single cell housing and the insulating member 1222 and electrically connected to the pole column assembly 12121, so that the electrode assembly can be electrically connected to the pole column assembly 12121 through the pole ear assembly 1221, thereby realizing charging and discharging of the electrode assembly under the action of the electrical connection between the pole column assembly 12121 and the pole ear assembly 1221.

[0072] Illustratively, the electrode assembly may be a rolled core or a stacked core.

[0073] like Fig.10 As shown, in the above embodiment of the present application, the side of the single cell 122 away from the pole ear assembly 1221 is connected to the bottom wall 121111 of the receiving groove 12111, and along the third direction Z, the groove depth of the receiving groove 12111 is H1mm, and the height of the single cell 122 is H2mm, satisfying the relationship: 0.5≤H2 / H1≤0.95.

[0074] In this embodiment, the side of the single cell 122 away from the tab assembly 1221 is connected to the bottom wall 121111 of the receiving groove 12111, and the ratio of the height H2 of the single cell 122 to the depth H1 of the receiving groove 12111 is controlled to be between 0.5 and 0.95 along the third direction Z. In this way, on the one hand, it can avoid that the height H2 of the single cell 122 is too small, resulting in a low space utilization rate of the shell assembly 121, thereby affecting the energy density of the battery pack 100. On the other hand, it can also avoid that the height H2 of the single cell 122 is too large, which affects the convenience of welding between the tab assembly 1221 and the pole assembly 12121.

[0075] In addition, a gap is provided between the side of the single battery 122 away from the bottom wall 121111 along the third direction Z and the cover 1212, so that, on the one hand, expansion space can be reserved for the single battery 122 in the third direction Z, thereby avoiding structural interference between the single battery 122 and the cover 1212. On the other hand, the side of the single battery 122 away from the bottom wall 121111 along the third direction Z can contact with the coolant, thereby further increasing the contact area between the coolant and the single battery 122, thereby further improving the thermal management capability of the battery pack 100.

[0076] Exemplarily, the ratio of the height H2 of the single cell 122 to the depth H1 of the receiving groove 12111 can be 0.5, 0.6, 0.7, 0.8, 0.9, 0.95, etc., and can be specifically designed according to the actual needs of the battery pack 100, which will not be listed here one by one.

[0077] It can be understood that when the single cell 122 is provided with an insulating member 1222 covering the single cell shell, the height H2 of the single cell 122 along the third direction Z is the height of the insulating member 1222 along the third direction Z. When the single cell 122 is not provided with an insulating member 1222 covering the single cell shell, the height H2 of the single cell 122 along the third direction Z is the height of the single cell shell along the third direction Z.

[0078] like Figure 8 As shown, in the above embodiment of the present application, the single cell 122 is located in the middle position of the receiving groove 12111 along the first direction X. Along the first direction X, the groove width of the receiving groove 12111 is W1mm, and the maximum width of the single cell 122 is W2mm, satisfying the relationship: 0.5≤W2 / W1≤0.95.

[0079] In this embodiment, the single battery 122 is arranged in the middle position of the receiving groove 12111 along the first direction X, so that the gap between the two sides of the single battery 122 along the first direction X and the first side wall 121112 close thereto is consistent, thereby, on the one hand, being able to minimize the probability of structural interference between the single battery 122 and the first side wall 121112. On the other hand, the two sides of the single battery 122 along the first direction X are in uniform contact with the coolant, which is conducive to improving the uniformity of heat dissipation and reducing the temperature difference between the two sides of the single battery 122 along the first direction X, thereby facilitating the improvement of the cycle performance and service life of the single battery 122.

[0080] The ratio of the maximum width W2 of the single cell 122 to the groove width W1 of the receiving groove 12111 is controlled to be between 0.5 and 0.95 along the first direction X. In this way, on the one hand, it is possible to avoid the maximum width W2 of the single cell 122 being too small, resulting in a low space utilization rate of the shell assembly 121, thereby affecting the energy density of the battery pack 100. On the other hand, it is also possible to avoid the maximum width W2 of the single cell 122 being too large, resulting in a small gap between the single cell 122 and the first side wall 121112, which affects the flow of the coolant, thereby affecting the thermal management capability of the battery pack 100. In addition, avoiding the maximum width W2 of the single cell 122 being too large is also conducive to reducing the probability of structural interference between the single cell 122 and the first side wall 121112.

[0081] Exemplarily, the ratio of the maximum width W2 of the single cell 122 to the width W1 of the receiving groove 12111 can be 0.5, 0.6, 0.7, 0.8, 0.9, 0.95, etc., and can be specifically designed according to the actual needs of the battery pack 100, which will not be listed here one by one.

[0082] It can be understood that when the single cell 122 is provided with an insulating member 1222 covering the single cell shell, the maximum width W2 of the single cell 122 along the second direction Y is the maximum width of the insulating member 1222 along the second direction Y. When the single cell 122 is not provided with an insulating member 1222 covering the single cell shell, the maximum width W2 of the single cell 122 along the second direction Y is the maximum width of the single cell shell along the second direction Y.

[0083] like Figure 8 As shown, in the above embodiment of the present application, along the second direction Y, the accommodating groove 12111 has a second side wall 121113 relatively arranged along the second direction Y, and the distance between the single battery 122 adjacent to the second side wall 121113 and the second side wall 121113 is D1, satisfying: 0mm<D1≤20mm.

[0084] In this embodiment, the spacing D1 between the single battery 122 adjacent to the second side wall 121113 and the second side wall 121113 is set to be greater than 0 mm, so as to avoid the single battery 122 adjacent to the second side wall 121113 from contacting with the second side wall 121113 and causing blockage, resulting in the inability of the coolant to flow into and out of the receiving groove 12111. At the same time, by setting the spacing D1 between the single battery 122 adjacent to the second side wall 121113 and the second side wall 121113 to be less than or equal to 20 mm, it is possible to avoid the overall length of the multiple single batteries 122 in the receiving groove 12111 in the second direction Y being too small, resulting in low space utilization of the shell assembly 121, thereby affecting the energy density of the battery pack 100.

[0085] Exemplarily, the distance D1 between the single battery 122 adjacent to the second side wall 121113 and the second side wall 121113 may be 2 mm, 5 mm, 10 mm, 15 mm, 20 mm, etc., and may be specifically designed according to the actual needs of the battery pack 100, which will not be listed here one by one.

[0086] It can be understood that when the single cell 122 is provided with an insulating member 1222 covering the single cell shell, the spacing D1 between the single cell 122 adjacent to the second side wall 121113 and the second side wall 121113 is the spacing between the insulating member 1222 adjacent to the second side wall 121113 and the second side wall 121113. When the single cell 122 is not provided with an insulating member 1222 covering the single cell shell, the spacing D1 between the single cell 122 adjacent to the second side wall 121113 and the second side wall 121113 is the spacing between the single cell shell adjacent to the second side wall 121113 and the second side wall 121113.

[0087] like Figure 8 As shown, in one embodiment of the present application, along the second direction Y, two adjacent single batteries 122 are arranged at intervals, and the interval between two adjacent single batteries 122 is D2, satisfying: 0mm<D2≤10mm.

[0088] In this embodiment, any two adjacent single cells 122 are spaced apart along the second direction Y so that both sides of the single cell 122 along the second direction Y can contact the coolant, thereby further increasing the contact area between the coolant and the single cell 122, thereby further improving the thermal management capability of the battery pack 100.

[0089] By setting the spacing D2 between two adjacent single cells 122 to be greater than 0 mm, expansion space is reserved for the single cells 122 in the second direction Y, thereby avoiding structural interference caused by the expansion of two adjacent single cells 122. At the same time, by setting the spacing D2 between two adjacent single cells 122 to be less than or equal to 10 mm, it is possible to avoid the spacing between two adjacent single cells 122 being too large, resulting in low space utilization of the shell assembly 121, thereby affecting the energy density of the battery pack 100.

[0090] Exemplarily, the distance D2 between two adjacent single cells 122 may be 1 mm, 2 mm, 3 mm, 5 mm, 6 mm, 8 mm, 10 mm, etc., and may be specifically designed according to the actual needs of the battery pack 100 , which will not be listed here one by one.

[0091] It is understandable that when the single cell 122 is provided with an insulating member 1222 covering the single cell shell, the distance D2 between two adjacent single cells 122 is the distance between two adjacent insulating members 1222. When the single cell 122 is not provided with an insulating member 1222 covering the single cell shell, the distance D2 between two adjacent single cells 122 is the distance between two adjacent single cell shells.

[0092] An embodiment of the present application further provides an electrical device, comprising the battery pack 100 in any of the above embodiments.

[0093] The electrical device has the battery pack 100 in any of the above embodiments, and thus has all the beneficial effects of the battery pack 100, which will not be described in detail here.

[0094] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means 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 may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0095] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A battery pack, the battery pack (100) having a first direction (X), a second direction (Y) and a third direction (Z) which are perpendicular to each other, characterized in that: The battery pack (100) comprises: A box body (110) having a receiving cavity (111); a plurality of battery packs (120), the plurality of battery packs (120) all extending along the second direction (Y), and the plurality of battery packs (120) arranged in the first direction (X) within the accommodating cavity (111); A liquid cooling pipe group (130), the liquid cooling pipe group (130) comprising a liquid inlet pipe (131) and a liquid outlet pipe (132), and the plurality of battery groups (120) are respectively connected to the liquid inlet pipe (131) and the liquid outlet pipe (132); The battery pack (120) comprises a shell assembly (121) and a plurality of single cells (122); the plurality of single cells (122) are arranged in the shell assembly (121) along the second direction (Y); a gap is provided between the single cells (122) and an inner wall of the shell assembly (121); and the liquid inlet pipe (131) and the liquid outlet pipe (132) are respectively connected to the gap.

2. The battery pack according to claim 1, characterized in that: The liquid inlet pipe (131) comprises a liquid inlet main path (1311) and a plurality of liquid inlet branches (1312); the liquid inlet main path (1311) extends along the first direction (X) and is arranged at one end of the plurality of battery packs (120) along the second direction (Y); the plurality of liquid inlet branches (1312) are arranged at intervals along the first direction (X), and each of the liquid inlet branches (1312) is respectively connected to the liquid inlet main path (1311) and one end of one of the shell components (121) along the second direction (Y); The liquid outlet pipe (132) comprises a liquid outlet main path (1321) and a plurality of liquid outlet branches (1322); the liquid outlet main path (1321) extends along the first direction (X) and is arranged at one end of the plurality of battery packs (120) along the second direction (Y) away from the liquid inlet main path (1311); the plurality of liquid outlet branches (1322) are arranged at intervals along the first direction (X), and each of the liquid outlet branches (1322) is respectively connected to the liquid outlet main path (1321) and one end of a shell component (121) along the second direction (Y) away from the liquid inlet main path (1311).

3. The battery pack according to claim 2, characterized in that: A first connecting pipe (1213) is provided at one end of the shell component (121) close to the liquid inlet main path (1311) along the second direction (Y), and the liquid inlet branch path (1312) is connected to the shell component (121) through the first connecting pipe (1213); A second connecting pipe (1214) is provided at one end of the shell component (121) close to the liquid outlet main path (1321) along the second direction (Y), and the liquid outlet branch path (1322) is connected to the shell component (121) via the second connecting pipe (1214).

4. The battery pack according to any one of claims 1 to 3, characterized in that: The shell assembly (121) comprises a shell (1211) and a cover (1212); the shell (1211) is provided with a receiving groove (12111); the cover (1212) is sealed at the notch of the receiving groove (12111); the receiving groove (12111) has a bottom wall (121111) opposite to the notch and a first side wall (121112) oppositely arranged along the first direction (X); the single cells (122) are arranged at intervals along the second direction (Y); the single cells (122) are arranged at intervals along the second direction (Y); ) is connected to the bottom wall (121111) of the accommodating groove (12111), there is the gap between the single battery (122) and the first side wall (121112) of the accommodating groove (12111), a pole lug assembly (1221) is arranged on the single battery (122), a pole column assembly (12121) is arranged on the cover body (1212), and one end of the pole lug assembly (1221) close to the cover body (1212) along the third direction (Z) is electrically connected to the pole column assembly (12121).

5. The battery pack according to claim 4, characterized in that: The cooling liquid transported by the liquid inlet pipe (131) is an insulating heat-conducting medium.

6. The battery pack according to claim 4, characterized in that: The single cell (122) comprises a single cell shell, an insulating member (1222) and an electrode assembly, wherein the insulating member (1222) covers the single cell shell, and the electrode assembly is located in the single cell shell. The electrode assembly is provided with the pole lug assembly (1221) at one end of the electrode assembly close to the cover body (1212) along the third direction (Z), and the pole lug assembly (1221) is inserted through the single cell shell and the insulating member (1222) and is electrically connected to the pole column assembly (12121).

7. The battery pack according to claim 4, characterized in that: The side of the single battery (122) facing away from the tab assembly (1221) is connected to the bottom wall (121111) of the receiving groove (12111); along the third direction (Z), the groove depth of the receiving groove (12111) is H1 mm, and the height of the single battery (122) is H2 mm, satisfying the relationship: 0.5≤H2 / H1≤0.

95.

8. The battery pack according to claim 4, characterized in that: The single cell (122) is located in the middle of the receiving groove (12111) along the first direction (X); along the first direction (X), the groove width of the receiving groove (12111) is W1 mm, and the maximum width of the single cell (122) is W2 mm, satisfying the relationship: 0.5≤W2 / W1≤0.

95.

9. The battery pack according to claim 4, characterized in that: Along the second direction (Y), the accommodating groove (12111) has a second side wall (121113) arranged opposite to each other along the second direction (Y), and the spacing between the single battery (122) adjacent to the second side wall (121113) and the second side wall (121113) is D1, satisfying: 0mm<D1≤20mm.

10. The battery pack according to claim 1, characterized in that: Along the second direction (Y), two adjacent single cells (122) are arranged at intervals, and the distance between two adjacent single cells (122) is D2, satisfying: 0mm<D2≤10mm.

11. An electrical device, characterized in that: A battery pack (100) comprising any one of claims 1 to 10.

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