Battery pack and electric device

Abstract

The invention discloses a battery pack and a power utilization device, and relates to the technical field of batteries. The battery pack comprises a plurality of single batteries and liquid cooling pieces arranged on at least one sides of the single batteries. The liquid cooling piece comprises a first side plate, a second side plate and a supporting piece, the supporting piece is connected between the first side plate and the second side plate so as to divide the runner cavity into two liquid cooling cavities, and the first side plate and / or the second side plate are / is in heat conduction connection with the battery monomers. The supporting piece comprises a body part and an elastic part, at least one side of the body part is provided with the elastic part which is arranged in a protruding mode, the elastic part is connected to the first side plate or the second side plate, the supporting piece is provided with a through hole, and the through hole penetrates through the body part and the elastic part to communicate the two liquid cooling cavities. The liquid cooling part can still be used for absorbing expansive force under the condition that enough pre-tightening force is provided for stacking the battery monomers, and can bear relatively large expansive force without being crushed, and meanwhile, the battery monomers also have good temperature uniformity and adaptability during expansion.

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] Existing battery packs use bottom cooling, which leads to uneven battery temperature, which in turn causes uneven battery expansion, affecting battery life. The increase in fast charge rate will also bring huge heat. Therefore, battery manufacturers are actively seeking large-area liquid cooling solutions. Cooling the large surface of the battery in large-area liquid cooling solutions is undoubtedly a better choice. However, the battery will expand, and after expansion, the battery will be squeezed, which seriously affects the battery life. Summary of the invention

[0003] The object of the present invention is to provide a battery pack and an electrical device to solve the technical problem that the liquid cooling solution in the prior art may squeeze the expanded battery, resulting in a reduction in the battery life.

[0004] In a first aspect, the present invention provides a battery pack, comprising a plurality of battery cells and a liquid cooling member, wherein the plurality of battery cells are arranged along a first direction, and the liquid cooling member is arranged on at least one side of the battery cells along the first direction. The liquid cooling member comprises a first side plate, a second side plate and a support member, wherein the first side plate and the second side plate are arranged opposite to each other in the first direction and enclose to form a flow channel cavity, wherein the support member is connected between the first side plate and the second side plate in the first direction to separate the flow channel cavity into two liquid cooling cavities arranged along the first direction, and the first side plate and / or the second side plate are thermally connected to the battery cells; wherein the support member comprises a main body and an elastic part, wherein the main body is arranged between the first side plate and the second side plate in the first direction, and an elastic part protruding along the first direction is provided on at least one side of the main body in the first direction, and the elastic part is connected to the first side plate or the second side plate, and a through hole is opened in the support member along the first direction, and the through hole passes through the main body and the elastic part to connect the two liquid cooling cavities.

[0005] In a second aspect, the present invention provides an electrical device, comprising the above-mentioned battery pack, wherein the battery pack supplies power to the electrical device.

[0006] The technical effect of the present invention is to provide a battery pack and an electrical device. When the battery cell expands, the expansion force generated by the battery cell will squeeze the liquid cooling part, so that the first side plate or the second side plate is squeezed toward the support part and deformed. When the first side plate and / or the second side plate are attached to the elastic part of the support part under the action of the expansion force, the elastic part can abut and support the first side plate and / or the second side plate to absorb the expansion force generated by the battery cell, and there is still a liquid cooling channel for the flow of liquid cooling medium between the first side plate and / or the second side plate and the main body of the support part to cool the battery cell. When the battery cell does not expand, the first side plate and / or the second side plate are not squeezed by the battery cell, and the liquid cooling medium can flow back and forth between the two liquid cooling chambers through the through hole of the elastic part to effectively increase the fluidity of the liquid cooling medium. At this time, the flow of the liquid cooling medium is relatively slow, but it can fill the entire flow channel cavity of the liquid cooling part and has good temperature uniformity. Therefore, the liquid cooling component of the present application can ensure that the internal gap of the liquid cooling component is used to absorb the expansion force while ensuring sufficient pre-tightening force for the battery cell stack, and can withstand large expansion force without being crushed. At the same time, the battery cell also has good temperature uniformity and adaptability when expanding. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0008] Figure 1 A schematic diagram of the overall structure of the battery pack provided in an embodiment of the present application.

[0009] Figure 2 An exploded view of the battery pack provided in an embodiment of the present application.

[0010] Figure 3 This is a schematic diagram of the assembly structure of the liquid cooling plate and the battery cell provided in this embodiment.

[0011] Figure 4 A partial exploded view of the liquid cooling plate and battery cells provided in this embodiment.

[0012] Figure 5 The structure of the support member provided in this embodiment is shown in FIG. Figure 1 .

[0013] Figure 6 for Figure 5 A partial enlarged view of area A in the middle.

[0014] Figure 7 This is a structural schematic diagram of the flow direction of the liquid cooling medium when the battery cell provided in this embodiment expands.

[0015] Figure 8This is a structural schematic diagram of the flow direction of the liquid cooling medium when the battery cell provided in this embodiment is not expanded.

[0016] Fig. 9 A schematic diagram of the assembly structure of the liquid cooling component and the current collector provided in an embodiment of the present application.

[0017] Fig.10 for Fig. 9 Cross-sectional view along AA direction.

[0018] Fig.11 The structure of the support member provided in this embodiment is shown in FIG. Figure 2 .

[0019] Fig.12 This is a side view of the liquid cooling plate and battery cell provided in this embodiment.

[0020] Fig.13 for Fig.12 Cross-sectional view along direction BB.

[0021] Fig.14 for Fig.13 Magnified view of site C in the middle.

[0022] Fig.15 for Fig.14 Magnified view of area D in center.

[0023] Fig.16 A schematic diagram of the structure in which multiple current collectors provided in an embodiment of the present application are connected by water pipes.

[0024] Fig.17 Schematic diagram of the internal structure of the current collector provided in the application embodiment Figure 1 .

[0025] Fig.18 Schematic diagram of the internal structure of the current collector provided in the application embodiment Figure 2 .

[0026] Component identification of the attached figure:

[0027] 100 battery pack; 1 battery cell; 11 first side wall; 12 second side wall; 10 spacing space; 2 liquid cooling member; 21 side plate; 211 first side plate; 212 second side plate; 2111 fixing plate; 22 supporting member; 221 first supporting plate; 222 second supporting plate; 2211 first abutting portion; 2212 second abutting portion; 210 main body; 220 elastic portion; 2201 first protrusion; 2202 second protrusion; 23 through hole; 231 first through hole; 232 second through hole; 24 mounting hole; 230 flow channel cavity; 2301 first liquid cooling cavity; 2302 second liquid cooling cavity; 3 current collector; 31 first current collector; 32 Two collectors; 30 collector cavities; 301 partition plates; 302 partition channels; 303 collector holes; 311 first collector plates; 312 second collector plates; 313 connecting plates; 3011 first sub-partition plates; 3012 second sub-partition plates; 30121 first partition sections; 30122 second partition sections; 3013 third sub-partition plates; 30131 third partition sections; 30132 fourth partition sections; 30133 fifth partition sections; 30130 openings; 3131 first sub-connecting plates; 3132 curved plates; 3130 socket structures; 4 boxes; 40 box openings; 5 box covers; 6 water pipes; 111 first portions; 112 second portions. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0029] 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" and the like indicate positions or positional relationships based on the positions 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 cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0030] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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, an electrical connection, or mutual communication; 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.

[0031] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0032] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the various specific processes and material examples provided by the present application, but those of ordinary skill in the art can appreciate the application of other processes and / or the use of other materials.

[0033] To solve the technical problem that the liquid cooling solution of the prior art will squeeze the expanded battery, resulting in a reduction in the battery life. The embodiment of the present application provides a battery pack, including a plurality of battery cells and a liquid cooling member, wherein the plurality of battery cells are arranged along a first direction, and the liquid cooling member is arranged on at least one side of the battery cell along the first direction. The liquid cooling member includes a first side plate, a second side plate and a support member, wherein the first side plate and the second side plate are arranged opposite to each other in the first direction and enclose to form a flow channel cavity, wherein the support member is connected between the first side plate and the second side plate in the first direction to separate the flow channel cavity into two liquid cooling cavities arranged along the first direction, and the first side plate and / or the second side plate are thermally connected to the battery cell; wherein the support member includes a main body and an elastic part, wherein the main body is arranged between the first side plate and the second side plate in the first direction, and an elastic part protruding along the first direction is provided on at least one side of the main body in the first direction, and the elastic part is connected to the first side plate or the second side plate, and a through hole is opened in the support member along the first direction, and the through hole passes through the main body and the elastic part to connect the two liquid cooling cavities.

[0034] When the battery cell expands, the expansion force generated by the battery cell will squeeze the liquid cooling part, causing the first side plate or the second side plate to be squeezed toward the support member and deformed. When the first side plate and / or the second side plate are attached to the elastic part of the support member under the action of the expansion force, the elastic part can support the first side plate and / or the second side plate, so that there is still a liquid cooling channel for the flow of liquid cooling medium between the first side plate and / or the second side plate and the main body of the support member, and the flow channel cavity is divided into two liquid cooling cavities that do not flow to each other. When the battery cell does not expand, the first side plate and / or the second side plate are not squeezed by the battery cell, and the liquid cooling medium can flow back and forth between the two liquid cooling cavities through the through hole of the elastic part to effectively increase the fluidity of the liquid cooling medium. At this time, the flow of the liquid cooling medium is relatively slow, but it can fill the entire flow channel cavity of the liquid cooling part, and has better temperature uniformity. Therefore, the liquid cooling element of the present application can ensure that the internal gap of the liquid cooling element is used to absorb the expansion force while ensuring that the battery cell stack has sufficient pre-tightening force, and can withstand large expansion forces without being crushed. At the same time, the battery cell also has good temperature uniformity and adaptability when expanding. The following will be elaborated in detail.

[0035] In one embodiment, the battery pack includes battery cells. Battery cells include, but are not limited to, lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., which are not limited in the embodiments of the present disclosure. The battery pack is a power supply for electrical devices. Electrical devices can be mobile phones, portable devices, laptops, electric vehicles, electric vehicles, ships, spacecraft, electric toys, and electric tools. For example, spacecraft include airplanes, rockets, space shuttles, and spacecrafts; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; 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.

[0036] like Figure 1 As shown, the battery pack 100 has a first direction X, a second direction Y, and a third direction Z intersecting in pairs, wherein the first direction X, the second direction Y, and the third direction Z intersect in pairs and are perpendicular.

[0037] like Figure 1 to Figure 2 As shown, the battery pack 100 includes a box body 4, which has a box opening 40 and a bottom opposite to the box opening 40, that is, the box opening 40 is located at the top of the box body 4. The battery pack 100 also includes a box cover 5, which covers the box opening 40.

[0038] The battery pack 100 further includes a plurality of battery cells 1 , which are arranged along a first direction X to form a battery pack. The plurality of battery packs are arranged along a second direction Y and accommodated in the box 4 .

[0039] Each battery cell 1 has two first side walls 11, two second side walls 12 and two third side walls. The first side walls 11 are arranged oppositely along the first direction X, the two second side walls 12 are arranged oppositely along the second direction Y, and the two third side walls are arranged oppositely along the third direction Z. The first side walls 11, the second side walls 12 and the third side walls are connected to each other. The surface areas of the second side walls 12 and the third side panels 21 are both smaller than the surface areas of the first side walls 11. In other words, the first side wall 11 is the large surface of the battery cell 1, and the second side walls 12 and the third side walls are the small surfaces of the battery cell 1.

[0040] At least one of the two third side walls of the battery cell 1 is provided with a pole, which includes a positive pole and a negative pole, and provides a corresponding connection point for an electrical device or circuit.

[0041] like Figure 4As shown, the battery pack 100 further includes a liquid cooling element 2, which is disposed on at least one side of the battery cell 1 along the first direction X. The liquid cooling element 2 is used to cool the heat generated by the battery cell 1 to prevent excessive temperature from affecting the cycle performance of the power battery.

[0042] The liquid cooling member 2 includes a first side plate 211, a second side plate 212 and a support member 22. The first side plate 211 and the second side plate 212 are arranged opposite to each other in the first direction X and enclose a flow channel cavity 230. The support member 22 is connected between the first side plate 211 and the second side plate 212 in the first direction X to separate the flow channel cavity 230 into two liquid cooling cavities arranged along the first direction X. The two liquid cooling cavities are respectively a first liquid cooling cavity 2301 and a second liquid cooling cavity 2302, wherein the first liquid cooling cavity 2301 is enclosed by the first side plate 211 and the support member 22 on one side in the first direction X, and the second liquid cooling cavity 2302 is enclosed by the second side plate 212 and the support member 22 on the other side in the first direction X. The liquid cooling medium can flow back and forth between the first liquid cooling cavity 2301 and the second liquid cooling cavity 2302, or can flow only in each liquid cooling cavity.

[0043] The first side plate 211 and / or the second side plate 212 are thermally connected to the battery cell 1 to achieve cooling of the battery cell 1. The specific implementation of "the first side plate 211 and / or the second side plate 212 are thermally connected to the battery cell 1" includes: when the liquid cooling unit 2 is arranged between two adjacent battery cells 1 in the first direction X, one of the two first side walls 11 of the battery cell 1 is thermally connected to the first side plate 211 of the support 22, and the other of the two first side walls 11 of the battery cell 1 is thermally connected to the second side plate 212 of the support 22. When the liquid cooling unit 2 is arranged between the battery cell 1 and the side plate 21 of the box body 4 in the first direction X, one of the two first side walls 11 of the battery cell 1 is thermally connected to the first side plate 211 of the support 22, or the other of the two first side walls 11 of the battery cell 1 is thermally connected to the second side plate 212 of the support 22.

[0044] like Figures 5 and 6 As shown, the support member 22 includes a body portion 210 and an elastic portion 220, and the body portion 210 is disposed between the first side plate 211 and the second side plate 212 in the first direction X. The body portion 210 is provided with an elastic portion 220 protruding along the first direction X on at least one side in the first direction X, and the elastic portion 220 is connected to the first side plate 211 or the second side plate 212. It can be understood that the body portion 210 is provided with an elastic portion 220 protruding along the first direction X on one side or both sides in the first direction X. Figures 4 to 6 It is shown that both sides of the main body 210 in the first direction X are provided with a plurality of elastic parts 220 protruding from the surface of the main body 210 .

[0045] The plurality of elastic parts 220 are arranged in the second direction Y and the third direction Z, and at least two adjacent elastic parts 220 are staggered in the second direction Y and / or the third direction Z. It is understandable that the plurality of elastic parts 220 have odd columns and even columns in the second direction Y, the plurality of elastic parts 220 arranged along the odd columns constitute a first elastic group, the plurality of elastic parts 220 arranged along the even columns constitute a second elastic group, the first elastic group and the second elastic group are alternately arranged in the third direction Z, and the elastic parts 220 of the first elastic group and the elastic parts 220 of the second elastic group are staggered in the third direction Z.

[0046] like Figure 7 As shown, a plurality of elastic parts 220 protruding from the surface of the main body 210 are provided on at least one side of the main body 210 in the first direction X. When the battery cell expands, the first side plate 211 and the second side plate 212 enclose the flow channel cavity 230, which will deform as the battery cell 1 expands. Under the expansion force, the first side plate 211 and / or the second side plate 212 will fit to the elastic part 220, and the elastic part 220 can abut and support the first side plate 211 and / or the second side plate 212, so that there is still a liquid cooling channel for the flow of liquid cooling medium between the first side plate 211 and / or the second side plate 212 and the main body 210 of the support member 22, and the flow channel cavity 230 is divided into two liquid cooling cavities that do not circulate with each other.

[0047] When the battery cell 1 does not expand, the flow channel cavity 230 can also be divided into two liquid cooling cavities that do not circulate with each other by the support member 22. Here, it is defined that the flow channel cavity 230 has a first state when the battery cell 1 expands, and the flow channel cavity 230 has a second state when the battery cell 1 does not expand, and the internal space of the flow channel cavity 230 in the first state is smaller than the internal space in the second state. In other words, the flow channel cavity 230 reduces the circulation space of the flow channel cavity 230 under the action of the expansion force. Therefore, under the condition that the preset pressure remains unchanged, the liquid cooling medium will increase the flow rate in the liquid cooling cavity of the liquid cooling member 2 and increase the heat exchange efficiency, which helps to quickly cool down and achieve temperature uniformity by relying on the scattered arrangement of the elastic part 220.

[0048] like Figure 8 As shown, the support member 22 is provided with a through hole 23 along the first direction X, and the through hole 23 penetrates the main body 210 and the elastic part 220 to connect the two liquid cooling chambers. When the battery cell 1 does not expand, the first side plate 211 and / or the second side plate 212 are not squeezed by the battery cell 1, and the liquid cooling medium can flow back and forth between the two liquid cooling chambers through the through hole 23 of the elastic part 220 to effectively increase the fluidity of the liquid cooling medium. At this time, the flow of the liquid cooling medium is relatively slow, but it can fill the entire flow channel cavity 230 of the liquid cooling member 2, and has a good temperature uniformity performance.

[0049] Therefore, the liquid cooling component 2 of the present application can ensure that the internal gap of the liquid cooling component 2 is used to absorb expansion while ensuring that sufficient pre-tightening force is given to the battery cell 1 stack, and can withstand large expansion force without being crushed. At the same time, the battery cell 1 also has good temperature uniformity and adaptability when expanding.

[0050] The elastic part 220 may be hemispherical, have high compression resistance, and be able to withstand the expansion force generated by the battery cell 1. The centerline spacing of any adjacent elastic parts 220 may be adjusted and determined by means of finite element analysis.

[0051] like Figures 9 and 10 As shown, the elastic part 220 includes a first protrusion 2201 and a second protrusion 2202, wherein the first protrusion 2201 is protruded relative to the main body 210 toward the first side plate 211, and the second protrusion 2202 is protruded relative to the main body 210 toward the second side plate 212, wherein a gap is provided between at least one of the first protrusion 2201 and the first side plate 211 and between the second protrusion 2202 and the second side plate 212. It can be understood that a gap is provided between the first protrusion 2201 and the first side plate 211, or a gap is provided between the second protrusion 2202 and the second side plate 212, or a gap is provided between the first protrusion 2201 and the first side plate 211 and between the second protrusion 2202 and the second side plate 212.

[0052] Therefore, when the battery cell 1 does not swell, Figure 8 As shown, the liquid cooling medium can flow from the gap between the first protrusion 2201 and the first side plate 211, or the liquid cooling medium can flow from the gap between the second protrusion 2202 and the second side plate 212, or the liquid cooling medium can flow from the gap between the first protrusion 2201 and the first side plate 211 and the gap between the second protrusion 2202 and the second side plate 212. On the contrary, when the battery cell 1 expands, the first protrusion 2201 is abutted and connected with the first side plate 211, and / or the second protrusion 2202 is abutted and connected with the second side plate 212 to support the first side plate 211 and / or the second side plate 212 to absorb the expansion force generated by the battery cell 1.

[0053] The through hole 23 includes a first through hole 231 and a second through hole 232. The first through hole 231 penetrates the first protrusion 2201 along the first direction X, and the second through hole 232 penetrates the second protrusion 2202 along the second direction Y. When the battery cell 1 does not expand, the first side plate 211 and / or the second side plate 212 are not squeezed by the battery cell 1, and the liquid cooling medium can flow back and forth between the two liquid cooling chambers through the first through hole 231 and / or the second through hole 232 to effectively increase the fluidity of the liquid cooling medium. At this time, the flow of the liquid cooling medium is relatively slow, but it can fill the entire flow channel cavity 230 of the liquid cooling unit 2, and has a good temperature uniformity performance.

[0054] In one embodiment, the first through hole 231 and the second through hole 232 are connected, and the first through hole 231 and the second through hole 232 are connected vertically or obliquely in the first direction X, which is not particularly limited herein. In another embodiment, the first through hole 231 and the second through hole 232 are arranged at intervals along the first direction X. It can be understood that the first through hole 231 and the second through hole 232 are arranged in a staggered manner in the first direction X, and the two are not connected to each other.

[0055] The distance between the inner wall of the through hole 23 and the axis of the through hole 23 decreases in the first direction X along a direction away from the main body 210 .

[0056] like Fig.10 As shown, the main body 210 includes a first support plate 221 and a second support plate 222. The first support plate 221 is arranged on a side of the second support plate 222 close to the first side plate 211 in the first direction X, and the second support plate 222 is arranged on a side of the first support plate 221 close to the second side plate 212 in the first direction X. The first support plate 221 is provided with a first protrusion 2201, and the second support plate 222 is provided with a second protrusion 2202.

[0057] The first support plate 221 has first abutment portions 2211 extending along the first direction X at both ends in the third direction Z, and the first abutment portion 2211 is connected to the first side plate 211. The second support plate 222 has second abutment portions 2212 extending along the first direction X at both ends in the third direction Z, and the second abutment portions 2212 are connected to the second side plate 212, wherein the extension direction of the first abutment portion 2211 is opposite to the extension direction of the second abutment portion 2212.

[0058] The first side plate 211 has fixed plates 2111 extending along the second direction Y at both ends in the third direction Z, and each end of the second side plate 212 in the third direction Z is connected to the fixed plate 2111, wherein the fixed plate 2111 is connected to both the first abutting portion 2211 and the second abutting portion 2212 to enhance the structural strength of the liquid cooling component 2.

[0059] In one embodiment, when the first abutting portion 2211 connected to the first support plate 221 is a plate-like structure, the first abutting portion 2211 is connected to the first side plate 211 to cooperate to enclose the first liquid cooling chamber 2301, and when the second support plate 222 is connected to the second abutting portion 2212 is a plate structure, the second abutting portion 2212 is connected to the second side plate 212 to cooperate to enclose the second liquid cooling chamber 2302. In another embodiment, when the first support plate 221 is connected to a plurality of first abutting portions 2211 arranged at intervals, the first abutting portion 2211, the first side plate 211 and the fixed plate 2111 cooperate to enclose the first liquid cooling chamber 2301, and when the second support plate 222 is connected to a plurality of second abutting portions 2212 arranged at intervals, the second abutting portion 2212, the second side plate 212 and the fixed plate 2111 cooperate to enclose the second liquid cooling chamber 2302.

[0060] The first support plate 221 , the second support plate 222 and the fixing plate 2111 may be fixed and sealed by ultrasonic welding.

[0061] The first support plate 221 and the first protrusion 2201 are integrally arranged, and the second support plate 222 and the second protrusion 2202 are integrally arranged, which improves the assembly effect and saves the production cost.

[0062] In some embodiments, Fig.11 As shown, the main body 210 is provided with a mounting hole 24 along the second direction Y, and the elastic part 220 is inserted into the mounting hole 24 and protrudes from both sides of the main body 210 along the first direction X. Therefore, the main body 210 and the elastic part 220 can be made of different materials to save production costs. The main body 210 can be made of a material with relatively strong rigidity, such as a metal material, and the elastic part 220 can be made of a material with relatively strong elasticity, such as a non-metallic material.

[0063] like Figure 4 as well as Figures 12 to 15 As shown, two adjacent battery cells 1 along the second direction Y are provided with a spacing space 10, the support member 22 includes a first portion 111 and a second portion 112 connected along the second direction Y, the first portion 111 is provided with an elastic portion 220, the first side wall 11 and the first portion 111 are correspondingly arranged in the first direction X, and the spacing space 10 and the second portion 112 are correspondingly arranged in the first direction X. Since a plurality of elastic portions 220 are arranged only in the first portion 111, but not in the second portion 112, the flow rate of the liquid cooling medium can be increased, and the cooling efficiency can be improved.

[0064] The “interval space 10 ” mentioned above is the distance in the second direction Y between two adjacent battery cells 1 .

[0065] The minimum distance between the first part 111 and the first side wall 11 in the first direction X is H1 mm, and the distance between the second part 112 and the first side wall 11 in the first direction X is H2 mm. H1 and H2 satisfy: H1<H2, which can increase the flow rate of the liquid cooling medium and improve the cooling efficiency.

[0066] It should be noted that the “minimum distance between the first portion 111 and the first side wall 11 in the first direction X” is the minimum distance between the outer surface of the elastic portion 220 and the first side wall 11 of the battery cell 1. The “minimum distance between the second portion 112 and the first side wall 11 in the first direction X” is the distance between the first side plate 211 or the second side plate 212 and the first side wall 11 of the battery cell 1.

[0067] like Figures 16 to 18 As shown, the battery pack 100 further includes current collectors 3, which are disposed at both ends of the liquid cooling member 2 in the second direction Y. Each current collector 3 is provided with a current collecting cavity 30 connected to the liquid cooling cavity.

[0068] like Figure 17 to Figure 18 As shown, the battery pack 100 further includes a partition plate 301 , which is disposed in the manifold 30 and divides the manifold 30 into a plurality of partition channels 302 , and the plurality of partition channels 302 of the partition plate 301 are all connected to the liquid cooling chamber.

[0069] A plurality of partition plates 301 are disposed at intervals in the manifold 30 , so that the liquid cooling medium can be effectively dispersed and collected when flowing into or out of the manifold 3 .

[0070] There is a gap between the partition plate and the support member 22 in the second direction Y. When the liquid-cooling medium flows out of the collector 3 in parallel through the constraint of the partition plate, the liquid-cooling medium can quickly transition to the liquid-cooling component 2 through the collector 3 under a certain pressure. The purpose of dispersing the liquid-cooling medium is to enable the liquid-cooling medium to flow evenly into the liquid-cooling cavity, so as to effectively improve the temperature uniformity of the liquid-cooling component 2.

[0071] like Figure 17 to Figure 18As shown, the current collector 3 includes a first current collecting plate 311, a second current collecting plate 312 and a connecting plate 313. The first current collecting plate 311 and the second current collecting plate 312 are arranged opposite to each other along the first direction X. The connecting plate 313 is connected to the first current collecting plate 311 and the second current collecting plate 312 at two ends in the first direction X, respectively. The first current collecting plate 311, the second current collecting plate 312 and the connecting plate 313 cooperate with each other to form a current collecting cavity 30. The partition plate 301 is connected to the first current collecting plate 311 and the second current collecting plate 312 at two ends in the first direction X, respectively, so as to divide the current collecting cavity 30 into a plurality of partition flow channels 302. In this way, after the liquid-cooling medium constrained by the partition plate flows out of the current collector 3, the liquid-cooling medium can quickly transition to the liquid-cooling component 2 through the current collector 3 under a certain pressure. The purpose of dispersing the liquid-cooling medium is to enable the liquid-cooling medium to flow into the liquid-cooling cavity evenly, so as to effectively improve the temperature uniformity of the liquid-cooling component 2.

[0072] The current collector 3 is provided with a current collecting hole 303 , which penetrates the first current collecting plate 311 and the second current collecting plate 312 and is disposed at a side away from the battery cell 1 in the second direction Y.

[0073] like Figure 4 As shown, the battery pack 100 further includes a water pipe 6 , which is disposed in a plurality of manifolds 303 to connect a plurality of liquid cooling components 2 .

[0074] The water pipe 6 can adopt a bellows structure, which can effectively absorb the displacement of the liquid cooling unit 2 caused by the expansion of the battery cell 1. The connection form of the water pipe 6 and the connection port of the current collector 3 is not limited. It can be a quick-connect connection, or a nozzle welded to the connection port of the current collector 3, and then the water pipe 6 is pressed into the nozzle by cold pressing. However, the premise of using the cold pressing method is that the material of the current collector 3 is metal, so that the current collector 3 can be welded to the nozzle.

[0075] like Figure 17 to Figure 18 As shown, the partition plate 301 includes a first sub-partition plate 3011, a second sub-partition plate 3012 and a third sub-partition plate 3013. The first sub-partition plate 3011 is arranged on the side close to the connecting plate 313 in the third direction Z, and the second sub-partition plate 3012 is arranged between the first sub-partition plate 3011 and the third sub-partition plate 3013 in the third direction Z.

[0076] The second sub-partition plate 3012 includes a first partition segment 30121 and a second partition segment 30122 connected along the second direction Y, the first partition segment 30121 is arranged between the first sub-partition plate 3011 and the third sub-partition plate 3013 in the third direction Z, the second partition segment 30122 is arranged close to the collecting hole 303 relative to the first partition segment 30121, the third sub-partition plate 3013 includes a third partition segment 30131, a fourth partition segment 30132 and a fifth partition segment 30133, the third partition segment 30131 and the fourth partition segment 30132 are spaced apart in the third direction Z, the two ends of the fifth partition segment 30133 are respectively connected to the third partition segment 30131 and the fourth partition segment 30132 and enclosed to form a third sub-partition plate 3013 with an opening 30130, the opening 30130 is away from the collecting hole 303, that is, the opening 30130 is toward the side of the flow channel cavity 230.

[0077] Therefore, when the liquid-cooling medium enters the collecting cavity 30, the liquid-cooling medium can be evenly diverted to each dividing channel 302 under the action of multiple partition plates 301, so that the liquid-cooling medium transitions to the liquid-cooling component 2 through the collecting body 3. The purpose of dispersing the liquid-cooling medium is to enable the liquid-cooling medium to flow evenly into the liquid-cooling cavity, so as to effectively improve the temperature uniformity of the liquid-cooling component 2.

[0078] The battery pack 100 has a reference plane perpendicular to the third direction Z and intersecting with the axis of the current collecting hole 303. The vertical distance between the first partition 30121 and the reference plane is D1, and the vertical distance between the second partition 30122 and the reference plane is D2. D1 and D2 satisfy that D2<D1, so that the separation channel 302 tends to converge toward the side of the current collecting hole 303 and tends to be parallel toward the side of the liquid cooling unit 2, and the whole is streamlined. Therefore, after the current collector 3 is connected to the liquid cooling unit 2, the liquid cooling medium can flow into the liquid cooling cavity evenly after passing through the current collector 3, so as to effectively improve the temperature uniformity of the liquid cooling unit 2.

[0079] The connecting plate 313 includes two first sub-connecting plates 3131 arranged opposite to each other in the third direction Z and a curved plate 3132 connected between the two first sub-connecting plates 3131 . The curved plate 3132 may be connected by a plurality of curved plates.

[0080] The connection end of the first sub-connection plate 3131 connected to the liquid cooling member 2 is provided with a socket structure 3130, which can be inserted into the flow channel cavity 230 to achieve the connection between the current collector 3 and the liquid cooling member 2. In order to improve the connection stability between the current collector 3 and the liquid cooling member 2, laser welding can be performed at the connection between the current collector 3 and the liquid cooling member 2.

[0081] Figure 2Two current collectors 3 are shown, namely the first current collector 31 and the second current collector 32. The first current collector 31 is provided at one end of the liquid cooling unit 2 in the second direction Y, and the second current collector 32 is provided at the other end of the liquid cooling unit 2 in the second direction Y. The water pipe 6 connected to the first current collector 31 is a liquid inlet pipe, and the water pipe 6 connected to the second current collector 32 is a liquid outlet pipe. Therefore, when the liquid cooling system is working, the liquid cooling medium flows into the first current collector 31 from the liquid inlet pipe, and through the action of the partition plate 301 inside the first current collector 31, the liquid cooling medium is evenly divided into each partition flow channel 302 and flows into the liquid cooling cavity. When the battery cell 1 expands due to heat, the first side wall 11 of the battery cell 1 compresses the first side plate 211 and / or the second side plate 212 of the liquid cooling member 2, so that the first side plate 211 and / or the second side plate 212 are compressed and deformed toward the support member 22, and finally the elastic part 220 can abut and support the first side plate 211 and / or the second side plate 212 to absorb the expansion force generated by the battery cell 1, and there is still a liquid cooling channel for the liquid cooling medium to flow between the first side plate 211 and / or the second side plate 212 and the main body 210 of the support member 22 to cool the battery cell 1. At the same time, since the flow channel cavity 230 is squeezed, the liquid cooling medium accelerates the flow rate under the same preset pressure, so as to achieve rapid cooling of the battery cell 1 to ensure temperature uniformity. After the liquid cooling medium flows out of the liquid cooling cavity and converges to the second current collector 32, then flows to the liquid outlet pipe, and finally is discharged from the liquid outlet pipe.

[0082] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0083] The above is a detailed introduction to a battery pack and an electrical device provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack, characterized in that: The battery pack has a first direction, a second direction and a third direction intersecting in pairs, and the battery pack includes: A plurality of battery cells are arranged along the first direction; and a liquid cooling member, the liquid cooling member being arranged on at least one side of the battery cell along the first direction, the liquid cooling member comprising a first side plate, a second side plate and a support member, the first side plate and the second side plate being arranged opposite to each other in the first direction and enclosing to form a flow channel cavity, the support member being connected between the first side plate and the second side plate in the first direction to separate the flow channel cavity into two liquid cooling cavities arranged along the first direction, the first side plate and / or the second side plate being thermally connected to the battery cell; Among them, the support member includes a main body and an elastic part, the main body is arranged between the first side plate and the second side plate in the first direction, at least one side of the main body in the first direction is provided with the elastic part protruding along the first direction, the elastic part is connected to the first side plate or the second side plate, and the support member is provided with a through hole along the first direction, and the through hole passes through the main body and the elastic part to connect the two liquid cooling chambers.

2. The battery pack according to claim 1, characterized in that: The elastic portion includes a first protrusion and a second protrusion, wherein the first protrusion is protruded relative to the main body toward the first side plate, and the second protrusion is protruded relative to the main body toward the second side plate, wherein at least one of a gap is provided between the first protrusion and the first side plate and between the second protrusion and the second side plate; The through hole includes a first through hole and a second through hole. The first through hole penetrates the first protrusion along the first direction, and the second through hole penetrates the second protrusion along the second direction.

3. The battery pack according to claim 2, characterized in that: The first through hole and the second through hole are connected, or the first through hole and the second through hole are spaced apart along the first direction.

4. The battery pack according to claim 2, characterized in that: The main body includes a first support plate and a second support plate, the first support plate is arranged on a side of the second support plate close to the first side plate in the first direction, the second support plate is arranged on a side of the first support plate close to the second side plate in the first direction, the first support plate is provided with the first protrusion, and the second support plate is provided with the second protrusion.

5. The battery pack according to claim 4, characterized in that: The first support plate is provided with first abutment portions extending along the first direction at both ends in the third direction, and the first abutment portions are connected to the first side plate; the second support plate is provided with second abutment portions extending along the first direction at both ends in the third direction, and the second abutment portions are connected to the second side plate, wherein an extension direction of the first abutment portion is opposite to an extension direction of the second abutment portion.

6. The battery pack according to claim 5, characterized in that: The first side plate is provided with fixing plates extending along the second direction at both ends in the third direction, and each end of the second side plate in the third direction is connected to the fixing plates; Wherein, the fixing plate is connected to both the first abutting portion and the second abutting portion.

7. The battery pack according to claim 4, characterized in that: The first support plate and the first protrusion are integrally provided, and the second support plate and the second protrusion are integrally provided.

8. The battery pack according to claim 1, characterized in that: The main body is provided with a mounting hole along the second direction, and the elastic part is passed through the mounting hole and protrudes from two sides of the main body along the first direction.

9. The battery pack according to claim 1, characterized in that: The distance between the inner wall of the through hole and the axis of the through hole decreases in the first direction away from the main body.

10. The battery pack according to claim 1, characterized in that: The battery pack further comprises: The plurality of elastic portions are arranged in the second direction and the third direction, and at least some of the adjacent two elastic portions are staggered in the second direction and / or the third direction.

11. The battery pack according to claim 1, characterized in that: The battery cell has a first side wall arranged opposite to each other along the first direction and a second side wall arranged opposite to each other along the second direction, the first side wall and the second side wall are connected, the surface area of ​​the second side wall is smaller than the surface area of ​​the first side wall, and the first side wall is thermally connected to the first side plate or the second side plate.

12. The battery pack according to claim 11, characterized in that: Two adjacent battery cells along the second direction are provided with a spacing space, the support member comprises a first portion and a second portion connected along the second direction, the first portion is provided with the elastic portion, the first side wall and the first portion are correspondingly arranged in the first direction, and the spacing space and the second portion are correspondingly arranged in the first direction; The minimum distance between the first portion and the first side wall in the first direction is H1 mm, and the distance between the second portion and the first side wall in the first direction is H2 mm, and H1 and H2 satisfy: H1<H2.

13. The battery pack according to claim 1, characterized in that: The battery pack further comprises: A current collector, the current collector being arranged at both ends of the liquid cooling plate in the second direction; the current collector being provided with a current collecting cavity connected to the liquid cooling cavity; A partition plate is arranged in the manifold and divides the manifold into a plurality of partition flow channels, and the plurality of partition flow channels of the partition plate are all connected with the liquid cooling chamber.

14. The battery pack according to claim 13, characterized in that: The current collector includes a first current collecting plate, a second current collecting plate and a connecting plate. The first current collecting plate and the second current collecting plate are arranged opposite to each other along the first direction. The two ends of the connecting plate in the first direction are respectively connected to the first current collecting plate and the second current collecting plate. The first current collecting plate, the second current collecting plate and the connecting plate cooperate with each other to form the current collecting cavity. The two ends of the partition plate in the first direction are respectively connected to the first current collecting plate and the second current collecting plate.

15. The battery pack according to claim 14, characterized in that: The current collector is provided with a current collecting hole, the current collecting hole penetrates the first current collecting plate and the second current collecting plate and is arranged at a side away from the battery cell in the second direction; The partition plate comprises a first sub-partition plate, a second sub-partition plate and a third sub-partition plate, wherein the first sub-partition plate is arranged on a side close to the connecting plate in the third direction, and the second sub-partition plate is arranged between the first sub-partition plate and the third sub-partition plate in the third direction; Among them, the second sub-partition plate includes a first partition segment and a second partition segment connected along the second direction, the first partition segment is arranged between the first sub-partition plate and the third sub-partition plate in the third direction, the second partition segment is arranged close to the collecting hole relative to the first partition segment, the third sub-partition plate includes a third partition segment, a fourth partition segment and a fifth partition segment, the third partition segment and the fourth partition segment are spaced apart in the third direction, the two ends of the fifth partition segment are respectively connected to the third partition segment and the fourth partition segment and enclose to form the third sub-partition plate with an opening, and the opening is facing away from the collecting hole.

16. The battery pack according to claim 15, characterized in that: The battery pack has a reference plane perpendicular to the third direction and intersecting the axis of the current collecting hole, A vertical distance between the first partition segment and the reference plane is D1, and a vertical distance between the second partition segment and the reference plane is D2, and D1 and D2 satisfy D2<D1.

17. An electrical device, characterized in that: It comprises a battery pack as claimed in any one of claims 1 to 16, wherein the battery pack supplies power to the electrical device.

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