Battery pack, battery pack and electric equipment

Abstract

The utility model provides a battery pack, a battery pack and electric equipment, and aims to overcome the defects in the related technology. The battery pack comprises at least two battery cells and a heat exchange structure, the at least two battery cells are arranged in the first direction, each battery cell comprises a shell and an output pole, the output pole is arranged at at least one end of the shell, the heat exchange structure comprises at least one first heat exchange pipe, each first heat exchange pipe comprises a main pipe and two branch pipes, the two branch pipes are communicated with the main pipe, and the branch pipes extend in the second direction; the two branch pipes are arranged in the first direction, the two branch pipes of the same first heat exchange pipe are located between the output electrodes of the two adjacent battery cells, the sides, facing the output electrodes, of the branch pipes are provided with first heat conduction faces, the first heat conduction faces are connected to the output electrodes, the header pipe is located at the ends, away from the output electrodes, of the branch pipes, and an included angle is formed between the first direction and the second direction. The first heat exchange tube in the battery pack occupies a small space, and the temperature uniformity of the battery pack is improved.

Description

Technical Field

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

[0002] Currently, users have higher and higher requirements for the battery charging speed. The charging rate has increased from 2C to 4C, or even higher, and the current has doubled, resulting in a greater internal resistance of the battery cell and more heat generated by the battery cell.

[0003] In the related art, a battery module may include a plurality of battery packs. Each battery pack includes a cold plate and a plurality of battery cells. The plurality of battery cells are arranged in sequence along the same direction. The cold plate is disposed at the top and / or bottom of the battery pack. The coolant circulates in the flow channels of the cold plate. After the battery cells exchange heat with the coolant, the coolant can take away the heat generated by the battery cells, thereby cooling the battery cells.

[0004] Due to the characteristic of uneven heat generation of lithium-ion battery cells themselves, the poles / ears of the battery cells generate more heat. However, the cooling method in the related art has a poor cooling effect on the poles / ears. Summary of the Utility Model

[0005] Based on this, the present application provides a battery pack, a battery module, and an electrical device to solve the deficiencies in the related art.

[0006] In a first aspect, the present application provides a battery pack, which includes: at least two battery cells arranged along a first direction. Each battery cell includes a housing and an output terminal, and the output terminal is disposed at at least one end of the housing;

[0007] a heat exchange structure, which includes at least one first heat exchange tube. The first heat exchange tube includes a main pipe and two branch pipes. Both branch pipes are communicated with the main pipe. The branch pipes extend along a second direction. The two branch pipes are arranged along the first direction. The two branch pipes of the same first heat exchange tube are located between the output terminals of two adjacent battery cells. One side of the branch pipe facing the output terminal has a first heat conduction surface, and the first heat conduction surface is connected to the output terminal. The main pipe is located at one end of the branch pipe away from the output terminal;

[0008] Wherein, the first direction and the second direction are arranged at an angle.

[0009] In a possible implementation manner, the heat exchange structure further includes: a heat conduction member, and the first heat conduction surface is connected to the output terminal through the heat conduction member.

[0010] In a possible implementation manner, the heat exchange structure further includes: a fixing bracket, and the fixing bracket is connected to the housing. The two ends of the fixing bracket along the first direction respectively abut against the two branch pipes of the same first heat exchange tube.

[0011] In a possible implementation, the heat exchange structure further includes: at least two second heat exchange tubes, the at least two second heat exchange tubes are arranged along the third direction, and the second heat exchange tubes are arranged in the gap between two adjacent shells, and the second heat exchange tubes have second heat conducting surfaces on opposite sides along the second direction, and the two second heat conducting surfaces are respectively connected to two different shells;

[0012] The third direction is arranged at an angle to both the first direction and the second direction.

[0013] In a possible implementation, the heat exchange structure further includes: a cold plate, the cold plate and the first heat exchange tube are located on two adjacent sides of the shell, and the main pipe and the second heat exchange tube are both plugged into the cold plate.

[0014] In a possible implementation, the battery pack further includes: a heat insulating member, which is disposed in a gap between two adjacent shells, and the heat insulating member and the second heat exchange tube are alternately disposed along a third direction.

[0015] In a possible implementation, the heat conducting member is a heat conducting adhesive.

[0016] In a possible implementation, the end surface of the output pole facing away from the housing protrudes beyond the side surface of the branch pipe facing away from the housing, or the end surface of the output pole facing away from the housing is flush with the side surface of the branch pipe facing away from the housing.

[0017] In a possible implementation, the end surface of the output pole facing away from the housing protrudes from the surface of the fixing bracket facing away from the housing, or the end surface of the output pole facing away from the housing is flush with the surface of the fixing bracket facing away from the housing.

[0018] In a possible implementation, a projection of the fixing bracket on the end surface of the housing is in an I-shape.

[0019] In a possible implementation, the first heat exchange tube is a first heat pipe, and the first heat pipe includes a first tube shell, a first capillary core arranged in the first tube shell, and a first heat exchange medium;

[0020] And / or, the second heat exchange tube is a second heat pipe, and the second heat pipe includes a second tube shell, a second capillary core arranged in the second tube shell, and a second heat exchange medium.

[0021] In a possible implementation, there are two output poles, the two output poles are arranged at the same end of the housing, and the two output poles are spaced apart along the second direction, and the first heat conducting surface of the same branch pipe is connected to the two output poles.

[0022] In a possible implementation, there are two output poles, which are arranged at two ends of the shell, and the first heat exchange tube is arranged at both ends of the shell.

[0023] In a second aspect, the present application provides a battery pack, which includes a housing and the battery pack provided in the first aspect above, and the battery pack is disposed inside the housing.

[0024] In a third aspect, the present application provides an electrical device, which includes an electrical device and the battery pack provided in the second aspect above, and the battery pack is used to supply power to the electrical device.

[0025] The present application provides a battery pack, a battery pack and an electrical device. The battery pack includes a battery cell and a heat exchange structure. The battery cell includes a housing and an output electrode. The heat exchange structure includes a first heat exchange tube. The first heat exchange tube includes a main pipe and branch pipes. The branch pipes include a first heat conduction surface. By providing the first heat conduction surface for connection with the output electrode, the branch pipes conduct heat between the heat exchange medium and the output electrode, so that the heat exchange medium cools or heats the output electrode, thereby improving the temperature uniformity of the battery cell. By providing one main pipe and two branch pipes and arranging the main pipe at one end of the branch pipes away from the output electrode, the heat exchange medium circulates between the main pipe and the branch pipes, thereby improving the heat exchange effect of the first heat exchange tube, and the structure of the first heat exchange tube can also be simplified, thereby reducing the occupied space of the first heat exchange tube, and thus improving the energy density of the battery pack.

[0026] In addition to the technical problems solved by the embodiments of the present application described above, the technical features constituting the technical solutions, and the beneficial effects brought by the technical features of these technical solutions, the other technical problems that the battery pack, the battery pack and the electrical device provided by the present application can solve, the other technical features included in the technical solutions, and the beneficial effects brought by these technical features will be further described in detail in the specific implementation manners. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0028] Figure 1 is a schematic structural diagram of the battery pack provided by the embodiment of the present application;

[0029] Figure 2 is Figure 1 the left view of;

[0030] Figure 3 is a schematic structural diagram of the first heat exchange tube in the battery pack provided by the embodiment of the present application;

[0031] Figure 4 is Figure 1 the bottom view of;

[0032] Figure 5 Schematic diagram of the structure of the battery cell, the second heat exchange tube and the heat insulation member in the battery pack provided by the embodiment of the present application.

[0033] Explanation of the reference numerals:

[0034] 10 - Battery pack; 100 - Battery cell; 110 - Outer shell; 120 - Output electrode; 200 - Heat exchange structure; 210 - First heat exchange tube; 211 - Main pipe; 212 - Branch pipe; 2121 - First heat conduction surface; 220 - Fixed bracket; 230 - Second heat exchange tube; 240 - Cold plate; 300 - Heat insulation member. Detailed implementation manners

[0035] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar components or components with the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of the present application. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present application, and should not be construed as a limitation to the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application. The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0036] In the description of the present application, it should be noted that, unless otherwise clearly defined and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, or an indirect connection through an intermediate medium, or the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0037] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is the orientation or positional relationship based on the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0038] The terms "first", "second", "third" (if any) in the description, claims and the above-mentioned drawings of the present application are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order different from those illustrated or described herein, for example.

[0039] In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or display comprising a series of steps or units need not be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or displays.

[0040] In the related art, a battery pack may include a plurality of battery modules. Each battery module includes a cold plate and a plurality of battery cells. The plurality of battery cells are arranged in sequence along the same direction. The cold plate is disposed at the top end and / or the bottom end of the battery module. The cooling liquid circulates in the flow channels of the cold plate. After heat exchange between the battery cells and the cooling liquid, the cooling liquid can take away the heat generated by the battery cells, thereby cooling the battery cells.

[0041] Due to the characteristic of uneven heat generation of lithium-ion battery cells themselves, the poles / ears of the battery cells generate relatively serious heat. However, the cooling method in the related art has a poor cooling effect on the poles / ears. This is because when only the cold plate is used for cooling, if the battery cells are long and the positions where the poles / ears are located are insufficiently cooled, resulting in a large temperature difference between the battery cells, the charging speed of the battery cells will be affected by the temperature difference and decreased.

[0042] In view of the above problems, the embodiments of the present application provide a battery module, a battery pack and an electrical device. By providing a first heat exchange tube on the end face where the output pole of the battery cell is located, the first heat exchange tube exchanges heat with the output pole, thereby improving the temperature uniformity of the battery cell. The first heat exchange tube includes a main pipe and two branch pipes. The two branch pipes are both connected to the main pipe. The two branch pipes can be respectively connected to the output poles of two battery cells, so that one first heat exchange tube can exchange heat with the output poles of two battery cells, thereby simplifying the structure of the first heat exchange tube and reducing the occupied space of the first heat exchange tube.

[0043] The following will describe in detail the specific embodiments of the battery module, the battery pack and the electrical device provided by the embodiments of the present application with reference to the accompanying drawings.

[0044] Refer to Figures 1 to 3As shown, the battery pack 10 provided in the embodiment of the present application includes a battery cell 100 and a heat exchange structure 200, the battery cells 100 are at least two, and the at least two battery cells 100 are arranged along the first direction, the battery cell 100 includes a shell 110 and an output pole 120, and the output pole 120 is arranged at least one end of the shell 110. The heat exchange structure 200 includes at least one first heat exchange tube 210, the first heat exchange tube 210 includes a main tube 211 and two branch tubes 212, the two branch tubes 212 are both connected to the main tube 211, the branch tubes 212 extend along the second direction, and the two branch tubes 212 are arranged along the first direction. The two branch tubes 212 of the same first heat exchange tube 210 are located between the output poles 120 of two adjacent battery cells 100, and the side of the branch tube 212 facing the output pole 120 has a first heat conductive surface 2121, and the first heat conductive surface 2121 is connected to the output pole 120, and the main tube 211 is located at one end of the branch tube 212 away from the output pole 120.

[0045] The first direction and the second direction are set at an angle. For example, the first direction can be perpendicular to the second direction. Figure 1 , Figure 2 and Figure 4 The X direction in the second direction can refer to Figure 1 and Figure 2 in the Y direction.

[0046] It can be understood that the output pole 120 is the current output end of the battery cell 100. Multiple battery cells 100 can be connected in series through a bus to the output pole 120 to form a high-voltage battery pack 10. The output pole 120 has different structural forms on different types of battery cells 100. For example, for a soft-pack battery cell 100, the output pole 120 can be a pole ear made of nickel or aluminum sheets. For a square battery cell 100, the output pole 120 can be a pole made of stainless steel or aluminum.

[0047] Due to the uneven heating characteristics of the battery cell 100, the output pole 120 of the battery cell 100 and the end where the output pole 120 is located heat up more seriously. For example, the two poles of the blade battery cell 100 can be set at both ends of its own length direction, and the temperature of the blade battery cell 100 shows a trend of being high at both ends and low in the middle. For another example, the two poles of the square battery cell 100 can be set at the same end of its own length direction, and the temperature of the end where the pole of the square battery cell 100 is located is higher than other parts.

[0048] Therefore, in order to effectively dissipate heat from the output terminal 120, on one side of the battery pack 10 where the output terminal 120 is located, a first heat exchange tube 210 is provided. The first heat exchange tube 210 is filled with a heat exchange medium, and the heat exchange medium has the characteristic of phase change. That is to say, the heat exchange medium can undergo a phase change within a certain temperature range. When the heat exchange medium absorbs heat and has a relatively high temperature, it can change from a liquid state to a gaseous state. When the temperature of the heat exchange medium is relatively low, it can change from a liquid state to a solid state, thereby releasing heat.

[0049] For example, the heat exchange medium can be an ethylene glycol aqueous solution, which is in a liquid state at room temperature.

[0050] Among them, the first heat exchange tube 210 includes a main tube 211 and two branch tubes 212. The two branch tubes 212 are respectively arranged corresponding to two adjacent battery cells 100. On the sides of the two branch tubes 212 facing away from each other, there are first heat conducting surfaces 2121. The first heat conducting surfaces 2121 of the two branch tubes 212 are respectively connected to the output terminals 120 of two adjacent battery cells 100. The first heat conducting surfaces 2121 can conduct heat exchange with the output terminals 120, and then conduct the heat to the heat exchange medium.

[0051] In this way, when the temperature of the output terminal 120 is relatively high, the branch tube 212 can absorb the heat of the output terminal 120. The heat exchange medium located in the branch tube 212 can change from a liquid state to a gaseous state after absorbing the heat of the output terminal 120. The gas moves towards the main tube 211, and the liquid in the main tube 211 moves towards the branch tube 212. Such a reciprocating cycle can take away the heat of the output terminal 120, thereby cooling the output terminal 120 and improving the overall temperature uniformity of the battery cell 100. Or, when the temperature of the output terminal 120 is relatively low, the heat exchange medium located in the branch tube 212 can change from a liquid state to a solid state, thereby releasing heat, and then the branch tube 212 heats the output terminal 120, thereby improving the temperature uniformity of the battery cell 100. In this way, the first heat exchange tube 210 can realize an adaptive heat exchange function.

[0052] It should be noted that the main tube 211 can be located between two adjacent battery cells 100, and the main tube 211 also extends along the second direction, so that the projection shape of the first heat exchange tube 210 on the end face of the battery cell 100 is in a Y shape. Or, the main tube 211 can also be set to be biased towards one of the two adjacent battery cells 100, as long as the ends of the two branch tubes 212 facing away from the output terminal 120 converge at one end of the main tube 211. In this way, the structure of the first heat exchange tube 210 can be simplified, and then the occupied space of the first heat exchange tube 210 can be reduced, which is beneficial to improving the energy density of the battery pack 10. Moreover, it can make the heat exchange media of the two branch tubes 212 converge to the main tube 211, or make the heat exchange medium of the main tube 211 be divided into the two branch tubes 212, and then make the heat exchange medium undergo a phase change under the temperature change, thereby driving the heat exchange medium to circulate in the first heat exchange tube 210.

[0053] The battery pack 10 provided by the embodiment of the present application includes a battery cell 100 and a heat exchange structure 200. The battery cell 100 includes a housing 110 and an output electrode 120. The heat exchange structure 200 includes a first heat exchange tube 210. The first heat exchange tube 210 includes a main tube 211 and branch tubes 212. The branch tubes 212 include a first heat conducting surface 2121. By providing the first heat conducting surface 2121 for connection with the output electrode 120, the branch tubes 212 can conduct heat between the heat exchange medium and the output electrode 120, so that the heat exchange medium cools or heats the output electrode 120, thereby improving the temperature uniformity of the battery cell 100. By providing one main tube 211 and two branch tubes 212, and arranging the main tube 211 at one end of the branch tubes 212 away from the output electrode 120, the heat exchange medium can circulate between the main tube 211 and the branch tubes 212, thereby improving the heat exchange effect of the first heat exchange tube 210, and the structure of the first heat exchange tube 210 can also be simplified, thereby reducing the occupied space of the first heat exchange tube 210, and thus improving the energy density of the battery pack 10.

[0054] In some embodiments, the heat exchange structure 200 further includes a heat conducting member, and the first heat conducting surface 2121 is connected to the output electrode 120 through the heat conducting member.

[0055] In this way, by providing a heat conducting member between the first heat conducting surface 2121 and the output electrode 120, the heat of the output electrode 120 can be efficiently conducted to the first heat conducting surface 2121, and then to the heat exchange medium, so as to cool down the output electrode 120. Or, the heat of the heat exchange medium can be conducted to the output electrode 120 through the first heat conducting surface 2121 and the heat conducting member in sequence, so as to heat the output electrode 120.

[0056] Refer to Figure 1 And Figure 2 As shown, in a possible implementation, the heat exchange structure 200 further includes a fixing bracket 220. The fixing bracket 220 is connected to the housing 110, and two ends of the fixing bracket 220 in the first direction respectively abut against two branch tubes 212 of the same first heat exchange tube 210.

[0057] In this way, when the fixing bracket 220 abuts between two branch tubes 212 of the same first heat exchange tube 210, the fixing bracket 220 has acting forces on both branch tubes 212. This acting force can prompt the first heat conducting surface 2121 to closely adhere to the output electrode 120, so as to fix the two branch tubes 212 between the output electrodes 120 of two adjacent battery cells 100, thereby improving the heat conduction efficiency.

[0058] Refer to Figure 4 And Figure 5As shown, in a possible implementation, the heat exchange structure 200 further includes at least two second heat exchange tubes 230. The at least two second heat exchange tubes 230 are arranged along a third direction, and the second heat exchange tubes 230 are disposed in the gap between two adjacent outer shells 110. Opposite sides of the second heat exchange tubes 230 along the second direction have second heat conducting surfaces, and the two second heat conducting surfaces are respectively connected to two different outer shells 110.

[0059] Wherein, the third direction is arranged at an angle with both the first direction and the second direction. For example, two of the first direction, the second direction, and the third direction are perpendicular to each other. The third direction may refer to Figure 1 and Figure 4 the Z direction in

[0060] The second heat exchange tubes 230 are also filled with a heat exchange medium. The two second heat conducting surfaces are respectively connected to two adjacent battery cells 100, so that the heat exchange medium absorbs the heat of the two adjacent battery cells 100, thereby cooling the two adjacent battery cells 100, or the heat exchange medium releases heat to the two adjacent battery cells 100, thereby heating the two adjacent battery cells 100. In this way, the second heat exchange tubes 230 can also improve the temperature uniformity of the battery pack 10.

[0061] It can be understood that since the temperatures at both ends of the blade battery cell 100 close to the pole post are relatively high, while the temperature in the middle of the blade battery cell 100 is relatively low. When arranging the second heat exchange tubes 230, the second heat exchange tubes 230 at both ends of the blade battery cell 100 can be arranged more densely to improve the cooling effect on both ends of the blade battery cell 100, and the second heat exchange tubes 230 in the middle of the blade battery cell 100 can be arranged more sparsely, thereby improving the temperature uniformity of the blade battery cell 100. In this way, the heat exchange structure 200 can achieve zone temperature control of the battery cell 100.

[0062] Referring to Figure 1 and Figure 2 As shown, in a possible implementation, the heat exchange structure 200 further includes a cold plate 240. The cold plate 240 and the first heat exchange tubes 210 are located on adjacent sides of the outer shell 110. The main pipe 211 and the second heat exchange tubes 230 are both inserted into the cold plate 240.

[0063] That is to say, when there are multiple first heat exchange tubes 210, the first heat exchange tubes 210 are arranged at intervals in the first direction on one side of the battery cell 100, while the cold plate 240 is arranged on the other side of the battery cell 100, and the first heat exchange tubes 210 and the cold plate 240 are arranged adjacent to each other, so that one end of the first heat exchange tube 210 and one end of the second heat exchange tube 230 can be inserted into the cold plate 240, so that both the first heat exchange tube 210 and the second heat exchange tube 230 can exchange heat with the cold plate 240. Then, the heat exchange medium in the first heat exchange tube 210, the second heat exchange tube 230 and the cold plate 240 can undergo a phase change, so that the cold plate 240 can condense the heat exchange medium in the first heat exchange tube 210 and the second heat exchange tube 230, or the first heat exchange tube 210 and the second heat exchange tube 230 can cause a turbulent flow effect on the heat exchange medium in the cold plate 240.

[0064] For example, the heat exchange medium in the branch pipe 212 absorbs the heat of the output terminal 120, changes from liquid to gas, and then flows towards the main pipe 211. The main pipe 211 exchanges heat with the cold plate 240, and then the heat exchange medium in the main pipe 211 can be cooled. After being cooled, the heat exchange medium can change from gas to liquid again. The liquid heat exchange medium in the main pipe 211 can return to the branch pipe 212 under the capillary action to continue absorbing the heat of the output terminal 120, so as to continuously cool the output terminal 120.

[0065] In some embodiments, the first heat exchange tube 210 is a first heat pipe, and the first heat pipe includes a first tube shell, a first capillary core arranged in the first tube shell, and a first heat exchange medium. And / or, the second heat exchange tube 230 is a second heat pipe, and the second heat pipe includes a second tube shell, a second capillary core arranged in the second tube shell, and a second heat exchange medium.

[0066] A heat pipe is a device that can quickly transfer heat energy from one point to another. The heat pipe has a strong heat conduction ability and very small heat loss. The heat pipe can be divided into three working sections, namely an evaporation section, an adiabatic section and a condensation section, along its own extension direction.

[0067] It should be understood that when the first heat exchange tube 210 is the first heat pipe, in the case where the temperature of the output terminal 120 is relatively high, among the main pipe 211 and the two branch pipes 212 of the first heat exchange tube 210, the end of the main pipe 211 away from the branch pipes 212 is equivalent to the evaporation section, the ends of the two branch pipes 212 away from the main pipe 211 are equivalent to the condensation section, and the first heat exchange tube 210 between the main pipe 211 and the two branch pipes 212 is equivalent to the adiabatic section. In this way, when one end of the first heat pipe (the end of the branch pipe 212 away from the main pipe 211) is heated, the first heat exchange medium in the first capillary core is heated and vaporized, and the vapor flows to the other end (the end of the main pipe 211 away from the branch pipes 212) under a small pressure difference to release heat and condense into a liquid. After that, the first heat exchange medium flows back along the porous structure of the first capillary core by the action of capillary force, and so on in a cycle. The heat is transferred from one end of the first heat pipe to the other end, thereby cooling the output terminal 120 with the first heat pipe.

[0068] Similarly, when the second heat exchange tube 230 is the second heat pipe, the end of the second heat exchange tube 230 close to the cold plate 240 is equivalent to the evaporation section, the end of the second heat exchange tube 230 away from the cold plate 240 is equivalent to the condensation section, the structure between the two ends of the second heat exchange tube 230 is equivalent to the adiabatic section, and the second heat exchange medium reciprocates in the second heat pipe. The heat is transferred from the end of the second heat pipe away from the cold plate 240 to the end of the second heat pipe close to the cold plate 240, thereby cooling the battery cell 100 with the second heat pipe.

[0069] Among them, the diameters of the first heat pipe and the second heat pipe may be the same or different, and the first heat exchange medium and the second heat exchange medium may be the same or different. For example, both the first heat exchange medium and the second heat exchange medium may be water, or both the first heat exchange medium and the second heat exchange medium may be ethylene glycol aqueous solution.

[0070] Refer to Figure 4 And Figure 5 As shown, in some embodiments, the battery pack 10 further includes a heat insulation member 300. The heat insulation member 300 is disposed in the gap between two adjacent outer casings 110, and the heat insulation member 300 and the second heat exchange tube 230 are alternately arranged along the third direction.

[0071] That is to say, the heat insulation member 300 is disposed between two adjacent battery cells 100 to inhibit the heat of one battery cell 100 from being transferred to another adjacent battery cell 100, and further control the temperature of the entire battery pack 10 below a preset temperature. The second heat exchange tube 230 can perform heat exchange with the battery cell 100 to cool the battery cell 100 when the temperature of the battery cell 100 is relatively high, and heat the battery cell 100 when the temperature of the battery cell 100 is relatively low, thereby improving the temperature uniformity of the battery pack 10 and controlling the temperature of the battery pack 10 within a preset temperature range.

[0072] For example, the thermal insulation 300 may be aerogel.

[0073] In a possible implementation, the heat conducting member is a heat conductive adhesive, so that the heat conductive adhesive can not only bond the branch pipe 212 to the output pole 120, but also improve the heat conduction efficiency between the branch pipe 212 and the output pole 120, thereby improving the heat exchange effect of the first heat exchange tube 210.

[0074] In a possible implementation, the end surface of the output pole 120 facing away from the housing 110 protrudes from the side surface of the branch pipe 212 facing away from the housing 110 , or the end surface of the output pole 120 facing away from the housing 110 is flush with the side surface of the branch pipe 212 facing away from the housing 110 .

[0075] It should be noted that the output poles 120 of the same polarity of two adjacent battery cells 100 need to be connected through a bus. When the end face of the outer shell 110 is provided with a first heat exchange tube 210, since the two branch pipes 212 are arranged between the two output poles 120, in order to avoid the branch pipes 212 interfering with the bus connecting the output poles 120 of the two adjacent battery cells 100, the side of the branch pipe 212 facing away from the outer shell 110 should not protrude from the end face of the output pole 120 facing away from the outer shell 110.

[0076] Similarly, when a fixing bracket 220 is provided between the two branch pipes 212, the end face of the output pole 120 facing away from the outer shell 110 protrudes from the surface of the fixing bracket 220 facing away from the outer shell 110, or the end face of the output pole 120 facing away from the outer shell 110 is flush with the surface of the fixing bracket 220 facing away from the outer shell 110, thereby preventing the fixing bracket 220 from interfering with the bus connecting the output poles 120 of two adjacent battery cells 100.

[0077] In a possible implementation, the projection of the fixing bracket 220 on the end surface of the housing 110 is in an I-shape. This arrangement can not only make the two ends of the fixing bracket 220 along the first direction have a larger contact surface with the two branch pipes 212, thereby improving the stabilization effect of the fixing bracket 220 on the branch pipes 212, but also make the fixing bracket 220 lighter.

[0078] In some embodiments, there are two output poles 120 , which are disposed at the same end of the housing 110 and spaced apart along the second direction, and the first heat conducting surface 2121 of the same branch pipe 212 is connected to the two output poles 120 .

[0079] In this embodiment, the length of the branch pipe 212 can be set to be longer so that the same branch pipe 212 is connected to the two output poles 120 of the same battery cell 100. In this way, two branch pipes 212 can be connected to four output poles 120, and a first heat exchange pipe 210 can exchange heat with the four output poles 120 of two battery cells 100. Furthermore, the structure of the first heat exchange pipe 210 can be simplified, thereby reducing the occupied space and cost of the first heat exchange pipe 210.

[0080] In some embodiments, there are two output poles 120, and the two output poles 120 are arranged at both ends of the housing 110, and first heat exchange pipes 210 are provided at both ends of the housing 110.

[0081] In this embodiment, since the two output poles 120 are arranged at both ends of the housing 110, it is necessary to provide first heat exchange pipes 210 at both ends of the housing 110 so that the first heat exchange pipes 210 exchange heat with the output poles 120 located at both ends of the housing 110, thereby improving the cooling effect of the battery cell 100 and thus improving the temperature uniformity of the battery cell 100.

[0082] The embodiment of the present application further provides a battery pack, which may include a housing and the battery pack 10 provided in the foregoing embodiment, and the battery pack 10 is arranged in the housing.

[0083] It can be understood that one or more battery packs 10 can be provided in a battery pack. Among them, the structure and working principle of the battery pack 10 have been described in detail in the foregoing embodiments and will not be elaborated herein one by one.

[0084] The embodiment of the present application further provides an electrical device, which includes an electrical device and a battery pack, and the battery pack is used to supply power to the electrical device.

[0085] Exemplarily, the electrical device can be a vehicle, which can be a new energy vehicle (such as an electric vehicle / electric car) or a fuel vehicle. The electrical device can be an electric motor, and the battery pack can provide electrical energy for the electric motor, and then drive the vehicle to travel through the electric motor. Or, the electrical device can also be a charging pile, the electrical device can be a storage cabinet, and the battery pack is used to provide electrical energy for the storage cabinet, thereby supplying power to the charging pile.

[0086] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack, characterized in that: include: At least two battery cells (100), at least two of the battery cells (100) are arranged along a first direction, the battery cell (100) comprises a housing (110) and an output pole (120), and the output pole (120) is arranged at at least one end of the housing (110); A heat exchange structure (200), the heat exchange structure (200) comprising at least one first heat exchange tube (210), the first heat exchange tube (210) comprising a main tube (211) and two branch tubes (212), the two branch tubes (212) being both connected to the main tube (211), the branch tubes (212) extending along a second direction, the two branch tubes (212) being arranged along the first direction, the two branch tubes (212) of the same first heat exchange tube (210) being located between the output poles (120) of two adjacent battery cells (100), the branch tube (212) having a first heat conducting surface (2121) on a side facing the output pole (120), the first heat conducting surface (2121) being connected to the output pole (120), the main tube (211) being located at an end of the branch tube (212) facing away from the output pole (120); Wherein, the first direction and the second direction are arranged at an angle.

2. The battery pack according to claim 1, characterized in that: The heat exchange structure (200) further comprises: a heat conducting member, and the first heat conducting surface (2121) is connected to the output pole (120) via the heat conducting member.

3. The battery pack according to claim 2, characterized in that: The heat exchange structure (200) further comprises: a fixed bracket (220), the fixed bracket (220) being connected to the outer shell (110), and the two ends of the fixed bracket (220) along the first direction respectively abutting against the two branch pipes (212) of the same first heat exchange pipe (210).

4. The battery pack according to any one of claims 1 to 3, characterized in that: The heat exchange structure (200) further comprises: at least two second heat exchange tubes (230), at least two of the second heat exchange tubes (230) are arranged along a third direction, and the second heat exchange tubes (230) are arranged in a gap between two adjacent shells (110), and the second heat exchange tubes (230) have second heat conduction surfaces on opposite sides along the second direction, and the two second heat conduction surfaces are respectively connected to two different shells (110); Wherein, the third direction is arranged at an angle with both the first direction and the second direction.

5. The battery pack according to claim 4, characterized in that: The heat exchange structure (200) further comprises: a cold plate (240), wherein the cold plate (240) and the first heat exchange tube (210) are located on two adjacent sides of the shell (110), and the main pipe (211) and the second heat exchange tube (230) are both plugged into the cold plate (240).

6. The battery pack according to claim 4, characterized in that: Also includes: A heat insulating member (300) is disposed in a gap between two adjacent shells (110), and the heat insulating member (300) and the second heat exchange tube (230) are alternately disposed along the third direction.

7. The battery pack according to claim 2 or 3, characterized in that: The heat conducting member is heat conducting glue.

8. The battery pack according to any one of claims 1 to 3, characterized in that: The end surface of the output pole (120) facing away from the housing (110) protrudes from the side surface of the branch pipe (212) facing away from the housing (110), or the end surface of the output pole (120) facing away from the housing (110) is flush with the side surface of the branch pipe (212) facing away from the housing (110).

9. The battery pack according to claim 3, characterized in that: The end surface of the output pole (120) facing away from the housing (110) protrudes from the surface of the fixing bracket (220) facing away from the housing (110), or the end surface of the output pole (120) facing away from the housing (110) is flush with the surface of the fixing bracket (220) facing away from the housing (110).

10. The battery pack according to claim 3, characterized in that: The projection of the fixing bracket (220) on the end surface of the housing (110) is in an I-shape.

11. The battery pack according to claim 4, characterized in that: The first heat exchange tube (210) is a first heat pipe, comprising a first tube shell, a first capillary core arranged in the first tube shell, and a first heat exchange medium; And / or, the second heat exchange tube (230) is a second heat pipe, and the second heat pipe comprises a second tube shell, a second capillary core arranged in the second tube shell, and a second heat exchange medium.

12. The battery pack according to any one of claims 1 to 3, characterized in that: There are two output poles (120), the two output poles (120) are arranged at the same end of the housing (110), and the two output poles (120) are arranged at intervals along the second direction, and the first heat conducting surface (2121) of the same branch pipe (212) is connected to the two output poles (120).

13. The battery pack according to any one of claims 1 to 3, characterized in that: There are two output poles (120), and the two output poles (120) are arranged at two ends of the outer shell (110). Both ends of the outer shell (110) are provided with the first heat exchange tube (210).

14. A battery pack, characterized in that: It comprises a shell and at least one battery pack (10) as described in any one of claims 1 to 13, wherein the battery pack (10) is arranged in the shell.

15. An electrical equipment, characterized in that: It comprises an electric device and the battery pack as claimed in claim 14, wherein the battery pack is used to supply power to the electric device.

Images