Battery pack and electric device

Abstract

The utility model relates to the technical field of batteries, in particular to a battery pack and an electric device. The battery pack comprises a first phase change material plate, a plurality of single batteries and a plurality of connecting pieces; the plurality of single batteries are arranged along a first direction and / or a second direction, each single battery comprises a battery body and a pole, the pole is arranged at the end part of the battery body in a third direction, and the poles of two adjacent single batteries are connected through a connecting piece; in the third direction, the first phase change material plate is provided with a first side and a second side, the first side is connected with the end part of the battery body in the third direction, and the second side is connected with the connecting sheet. The first phase-change material plate is used for phase-change heat absorption, and when the battery body, the pole and the connecting piece generate heat, the first phase-change material plate can absorb the heat of the battery body, the pole and the connecting piece through phase-change heat absorption, so that the cooling of the battery body, the pole and the connecting piece is realized, and the technical problem that the heating value near the pole of the battery pack is relatively large is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly relates to a battery pack and an electric device. Background Art

[0002] When the battery pack is charged and discharged at high temperature, a high cooling efficiency is required for high-rate charging and discharging. However, the current cooling system is difficult to achieve rapid heat dissipation. In addition, due to factors such as production process, connection structure, and cooling conditions, the temperature distribution of the battery pack is also uneven. If individual single cells work in a high-temperature environment for a long time due to insufficient heat dissipation, their capacity will decrease, resulting in premature aging of the single cells, thereby causing the rated voltage and current of the battery pack to decrease. Therefore, how to improve the cooling effect and temperature balance of the battery pack urgently needs to be solved. Summary of the Utility Model

[0003] In view of this, the utility model aims to provide a battery pack and an electric device to solve or partially solve the problems of poor cooling effect and poor temperature balance of the existing battery pack.

[0004] To achieve the above object, the technical solution of the utility model is realized as follows:

[0005] In a first aspect, an embodiment of the utility model provides a battery pack having first, second, and third directions that intersect pairwise. The battery pack includes a first phase change material plate, a plurality of single cells, and a plurality of connection pieces; the plurality of single cells are arranged along the first direction and / or the second direction. The single cell includes a battery body and a pole column. The pole column is provided at an end of the battery body in the third direction. The connection piece connects the pole columns of two adjacent single cells and is spaced from the battery body in the third direction Z; at least a part of the first phase change material plate is disposed between the connection piece and the battery body; in the third direction, the first phase change material plate has a first side and a second side that face away from each other. The first side is connected to an end of the battery body in the third direction, and the second side is connected to the connection piece.

[0006] Optionally, the second side is provided with a plurality of grooves, and the plurality of grooves are arranged along the first direction and / or the second direction. At least a part of the connection piece is received in the groove.

[0007] Optionally, the groove has a groove wall and a groove bottom. An end of the groove wall close to the battery body is connected to the groove bottom, and both the groove wall and the groove bottom are in heat conduction connection with the connection piece.

[0008] Optionally, a first through hole is provided at the bottom of the slot, and the pole post passes through the first through hole and is connected to the connecting piece; alternatively, the connecting piece passes through the first through hole and is connected to the pole post.

[0009] Optionally, a plurality of second through holes are provided on the first phase change material plate, and the plurality of second through holes are arranged along the first direction and / or the second direction; an explosion-proof valve is provided at an end of the battery body in the third direction, and the explosion-proof valve is arranged corresponding to the second through hole.

[0010] Optionally, the battery pack further includes a temperature-resistant layer, the temperature-resistant layer is arranged on the first phase change material plate, surrounds the outer periphery of the second through hole, and / or the temperature-resistant layer is located on the hole wall of the second through hole.

[0011] Optionally, the first phase change material plate is an insulating member.

[0012] Optionally, the battery pack further includes a second phase change material plate and a box body, the second phase change material plate, the first phase change material plate, the plurality of single batteries and the plurality of connecting pieces are all arranged inside the box body, and the second phase change material plate is connected between the box body and the single battery.

[0013] Optionally, the second phase change material plate includes an inner layer phase change material plate and an outer layer phase change material plate, the inner layer phase change material plate is connected between the outer layer phase change material plate and the single battery; the outer layer phase change material plate is connected between the inner layer phase change material plate and the box body, and the phase change temperature of the inner layer phase change material plate is greater than the phase change temperature of the outer layer phase change material plate.

[0014] Optionally, the battery pack further includes a filler, and the filler is filled between the second phase change material plate and the box body.

[0015] Optionally, the elastic modulus of the first phase change material plate is E1, satisfying: 10 MPa ≥ E1 ≥ 1 MPa; and / or, the range of the elastic modulus E2 of the second phase change material plate is 10 MPa ≥ E2 ≥ 1 MPa.

[0016] Optionally, the first phase change material plate abuts between the connecting piece and the battery body.

[0017] In a second aspect, an embodiment of the present invention further provides an electrical device, the electrical device includes an electrical device body and the battery pack as described above, and the battery pack is connected to the electrical device body.

[0018] The utility model discloses a battery pack, in which a plurality of single cells are arranged along a first direction X and / or a second direction Y. The single cell includes a cell body and a pole column. The pole column is provided at an end of the cell body in a third direction Z. A connecting piece connects the pole columns of two adjacent single cells. When the battery pack is charged and discharged, heat is generated in the cell body, the pole column and the connecting piece. A first phase change material plate is used for phase change heat absorption. A first side of the first phase change material plate is connected to the end of the cell body in the third direction Z, and a second side of the first phase change material plate is connected to the connecting piece. When heat is generated in the cell body, the pole column and the connecting piece, after reaching the phase change temperature of the first phase change material plate, the material inside the first phase change material plate will undergo a phase change, thereby absorbing a large amount of heat. Furthermore, it can quickly absorb the heat of the cell body and the connecting piece connected to the first phase change material plate. Since the connecting piece is connected to the pole column, the heat of the pole column can also be quickly absorbed through the connecting piece, so as to realize the cooling of the cell body, the pole column and the connecting piece, thereby improving the cooling efficiency and temperature balance of the battery pack and enhancing the safety of the battery pack.

[0019] The above description is only an overview of the technical solution of the utility model. In order to be able to understand the technical means of the utility model more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the utility model more obvious and understandable, the following specifically gives the specific embodiments of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required to be used in the description of the embodiments of the present utility model. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0021] Figure 1 It is a partial structural schematic diagram of the battery pack described in the embodiment of the present utility model;

[0022] Figure 2 It is a structural schematic diagram of a partial exploded view of the battery pack described in an embodiment of the present utility model;

[0023] Figure 3 It is a structural schematic diagram of a partial exploded view of the battery pack described in another embodiment of the present utility model;

[0024] Figure 4 It is a structural schematic diagram of a top view of the battery pack described in the embodiment of the present utility model;

[0025] Figure 5 It is a structural schematic diagram of the first phase change material plate described in the embodiment of the present utility model;

[0026] Figure 6 is Figure 4 a schematic structural view of the A-A cross-sectional view in

[0027] Figure 7 is Figure 6 a schematic structural view of the enlarged view of part C in

[0028] Figure 8 is Figure 4 a schematic structural view of the B-B cross-sectional view in

[0029] Figure 9 is Figure 8 a schematic structural view of the enlarged view of part D in

[0030] Figure 10 a schematic structural view of the single cell according to the embodiment of the present utility model;

[0031] Figure 11 is Figure 4 a three-dimensional structural view of the enlarged view of part E in

[0032] Reference numerals:

[0033] 1, the first phase change material plate; 11, the first through hole; 12, the groove; 121, the groove wall; 122, the groove bottom; 13, the second through hole; 141, the first side; 142, the second side; 2, the single cell; 21, the cell body; 22, the terminal post; 23, the explosion-proof valve; 3, the connecting piece; 4, the second phase change material plate; 41, the inner layer phase change material plate; 42, the outer layer phase change material plate; 43, the phase change material side plate; 44, the phase change material bottom plate; 5, the filling body; 6, the box body; X, the first direction; Y, the second direction; Z, the third direction. Detailed implementation manners

[0034] Hereinafter, the exemplary embodiments of the present utility model will be described in more detail with reference to the accompanying drawings. Although the exemplary embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present utility model can be more thoroughly understood and the scope of the present utility model can be completely conveyed to those skilled in the art.

[0035] In this application, the term "parallel" not only includes the case of absolute parallelism, but also includes the case of approximate parallelism commonly recognized in engineering. For example, "parallel" means that the angle formed by a straight line and a straight line, a straight line and a plane, or a plane and a plane is in the state of -1° to 1°. At the same time, "perpendicular" not only includes the case of absolute perpendicularity, but also includes the case of approximate perpendicularity commonly recognized in engineering. For example, "perpendicular" means that the angle formed by a straight line and a straight line, a straight line and a plane, or a plane and a plane is in the state of 89° to 91°. Equal distance or equal angle not only includes the case of absolute equality, but also includes the case of approximate equality commonly recognized in engineering, that is, a certain error can exist, such as the state where the tolerance range is -1% to 1%.

[0036] An embodiment of the present application discloses a battery pack, in which there are a first direction X, a second direction Y, and a third direction Z that intersect pairwise. Among them, the angles between the first direction X, the second direction Y, and the third direction Z are set according to the usage requirements. For example, as shown in Figure 2 shown, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other pairwise.

[0037] As shown in Figures 1 to 11 shown, the battery pack includes a first phase change material plate 1, a plurality of single cells 2, and a plurality of connecting pieces 3; the plurality of single cells 2 are arranged along the first direction X and the second direction Y. The single cell 2 includes a cell body 21 and a pole 22. A pole 22 is provided at the end of the cell body 21 in the third direction Z. The connecting piece 3 connects the poles 22 of two adjacent single cells 2, and the connecting piece 3 is spaced from the cell body 21 in the third direction Z; the first phase change material plate 1 is at least partially disposed between the cell body 21 and the connecting piece 3. The first phase change material plate 1 has a first side 141 and a second side 142 that face away from each other in the third direction Z. The first side 141 is connected to the end of the cell body 21 in the third direction Z, and the second side 142 is connected to the connecting piece 3.

[0038] Specifically, as shown in Figure 5 shown, in the third direction Z, the first phase change material plate 1 has a first side 141 and a second side 142. The first side 141 of the first phase change material plate 1 is located in the negative direction of the third direction Z, and the second side 142 of the first phase change material plate 1 is located in the positive direction of the third direction Z. The first side 141 and the second side 142 are oppositely arranged.

[0039] The first phase change material plate 1 is a phase change material component. The phase change material refers to a substance that changes its physical state and can provide latent heat without changing temperature. The process of changing physical properties is called a phase change process. During the phase change process, the phase change material will absorb or release a large amount of latent heat.

[0040] In the embodiments of the present application, a plurality of single cells 2 are arranged along a first direction X and a second direction Y. The single cell 2 includes a cell body 21 and a pole 22. The pole 22 is provided at an end of the cell body 21 in a third direction Z. The poles 22 of two adjacent single cells 2 are connected by a connecting piece 3. When the battery pack is charged and discharged, the heat generated by the cell body 21 will be conducted to the pole 22 and the connecting piece 3 at the same time. In some other embodiments, the plurality of single cells 2 may be arranged only along the first direction X or the second direction Y.

[0041] The first phase change material plate 1 is used for phase change heat absorption. A first side 141 of the first phase change material plate 1 is connected to an end of the cell body 21 in the third direction Z, and a second side 142 of the first phase change material plate 1 is connected to the connecting piece 3. The first phase change material plate 1 can absorb the heat of the cell body 21 and the connecting piece 3 connected to the first phase change material plate 1 by phase change heat absorption, and further can absorb the heat of the pole 22 through the connecting piece 3. And since the pole 22 is directly connected to the electrode core inside the single cell 2, a heat transfer path of electrode core - pole - connecting piece is formed, and the direct heat conduction efficiency of this heat transfer path is relatively high, so that the single cell 2 can be quickly cooled, and the rapid cooling of the cell body 21, the pole 22 and the connecting piece 3 can be realized, thereby greatly improving the cooling efficiency and cooling effect of the battery pack.

[0042] In some embodiments, the first phase change material plate 1 abuts between the cell body 21 and the connecting piece 3, so that the first phase change material plate 1 can make reliable contact with the cell body 21 and the connecting piece 3, thereby ensuring the cooling effect.

[0043] Optionally, the first phase change material plate 1 is an insulating part. At this time, the first phase change material plate 1 also has good insulation ability. The first phase change material plate 1 can increase the creepage distance and electrical clearance between the single cell 2 and the connecting piece 3, and improve the safety of the whole battery pack. And, at this time, the first phase change material plate 1 can isolate the connecting piece 3 and the single cell 2, so as to save the use of an electrical isolation plate, further improve the integration efficiency of the battery pack, and reduce the manufacturing cost of the battery pack.

[0044] Optionally, referring to Figure 5 As shown, a plurality of grooves 12 are provided on the second side 142 of the first phase change material plate 1. The plurality of grooves 12 are arranged along the first direction X; or, the plurality of grooves 12 are arranged along the first direction X and the second direction Y; or, the plurality of grooves 12 are arranged along the second direction Y; at least a part of the connecting piece 3 is received in the grooves 12.

[0045] Among them, the arrangement direction of the plurality of grooves 12 is set according to the use requirements, and the embodiments of the present application do not make specific limitations in this regard. For example, referring to Figure 5 As shown, the plurality of grooves 12 are arranged along the first direction X and the second direction Y, and the plurality of grooves 12 are arranged in an array. Referring toFigure 7 , Figure 7 The schematic diagram shows the structure in which the connecting piece 3 is arranged in the groove 12 .

[0046] In the above structure of the embodiment of the present application, the connecting piece 3 is arranged in the groove 12, and the groove 12 can realize the positioning of the connecting piece 3, which is easier to position during the process assembly of the battery pack.

[0047] Optional, see Figure 5 and Figure 7 As shown, the groove 12 has a groove wall 121 and a groove bottom 122. The end of the groove wall 121 close to the battery body 21 is connected to the groove bottom 122, and both the groove wall 121 and the groove bottom 122 are thermally connected to the connecting sheet 3.

[0048] In the battery pack of the embodiment of the present application, the groove wall 121 and the groove bottom 122 are both thermally connected to the connecting piece 3, which can increase the contact area between the groove 12 and the connecting piece 3, that is, increase the heat exchange area between the first phase change material plate 1 and the connecting piece 3. The first phase change material plate 1 can effectively absorb heat when the battery pack generates heat during high current charging and discharging, ensuring the heat dissipation of the battery body 21, the pole 22 and the connecting piece 3. At the same time, the contact between the groove wall 121 and the groove bottom 122 and the connecting piece 3 can facilitate the positioning of the connecting piece 3 and the assembly of the battery pack.

[0049] Optionally, in one embodiment, the slot bottom 122 is provided with a first through hole 11, and the pole 22 is passed through the first through hole 11 and connected to the connecting piece 3. Figures 5 to 7 , Figure 7 The schematic diagram shows the structure in which the pole 22 passes through the first through hole 11 and is connected to the connecting piece 3 .

[0050] In this embodiment of the present application, the connecting piece 3 is arranged in the groove 12, and after the pole 22 passes through the first through hole 11, the end of the pole 22 away from the single battery 2 is connected to the connecting piece 3 located in the groove 12. The pole 22 is in contact with the first through hole 11, and the portion of the first phase change material plate 1 located at the first through hole 11 can absorb the heat of the pole 22, thereby achieving rapid cooling of the pole 22.

[0051] Optionally, in another embodiment, the connecting piece 3 is passed through the first through hole 11 and connected to the pole 22. In the above structure, the first through hole 11 and the part of the connecting piece 3 passing through the first through hole 11 are in contact, and the first phase change material plate 1 can absorb the heat of the part of the connecting piece 3 located in the first through hole 11, thereby increasing the cooling effect on the connecting piece 3.

[0052] In this embodiment of the present application, after the connecting piece 3 passes through the first through hole 11 , the end of the connecting piece 3 facing the battery body 21 is connected to the pole 22 .

[0053] Optional, see Figure 5As shown in the figure, a plurality of second through holes 13 are further provided on the first phase change material plate 1. The plurality of second through holes 13 are arranged along the first direction X, or the plurality of second through holes 13 are arranged along the second direction Y, or the plurality of second through holes 13 are arranged along the first direction X and the second direction Y. An explosion-proof valve 23 is provided at the end of the battery body 21 in the third direction Z, and the explosion-proof valve 23 is arranged corresponding to the second through hole 13.

[0054] The explosion-proof valve 23 is used to automatically open when the battery body 21 is over-pressured or the temperature is too high, and discharge the high-pressure gas inside the battery body 21, so as to achieve the purpose of explosion protection. It is a safety device in the battery body 21. In the embodiment of the present application, the explosion-proof valve 23 is arranged corresponding to the second through hole 13, and the gas discharged by the explosion-proof valve 23 can be discharged through the second through hole 13 to ensure the smooth discharge of the gas to ensure the safety of the battery body 21.

[0055] Optionally, the battery pack further includes a temperature-resistant layer, which is arranged on the first phase change material plate 1 and surrounds the outer periphery of the second through hole 13, and / or the temperature-resistant layer is located on the hole wall of the second through hole 13.

[0056] Specifically, the above structure of the present application specifically includes the following three situations. The first is that the temperature-resistant layer is arranged on the first phase change material plate 1 and surrounds the outer periphery of the second through hole 13. The second is that the temperature-resistant layer is arranged on the first phase change material plate 1 and is located on the hole wall of the second through hole 13. The third is that the temperature-resistant layer is arranged on the first phase change material plate 1, the temperature-resistant layer surrounds the outer periphery of the second through hole 13, and the temperature-resistant layer is located on the hole wall of the second through hole 13.

[0057] In the embodiment of the present application, arranging the temperature-resistant layer on the first phase change material plate 1 can prevent the high-temperature gas from burning through the first phase change material plate 1 and causing damage to the first phase change material plate 1 when the battery body 21 undergoes thermal runaway. Therefore, the arrangement of the temperature-resistant layer can ensure the cooling effect of the battery pack and improve the safety of the battery pack.

[0058] Among them, the outer periphery and the hole wall of the second through hole 13 are the positions closest to the explosion-proof valve 23. Therefore, the temperature-resistant layer is arranged on the first phase change material plate 1 and surrounds the outer periphery of the second through hole 13; or the temperature-resistant layer is located on the hole wall of the second through hole 13; or the temperature-resistant layer is arranged on the first phase change material plate 1, surrounds the outer periphery of the second through hole 13, and the temperature-resistant layer is located on the hole wall of the second through hole 13. The above positions of the temperature-resistant layer can effectively avoid the problem of the first phase change material plate 1 being burned through.

[0059] Optionally, the temperature-resistant layer includes a PI hot-pressing film, or the temperature-resistant layer can also be a coating formed by spraying a high-temperature-resistant epoxy-modified spraying material.

[0060] Optionally, the range of the elastic modulus E1 of the first phase change material plate 1 is 10 MPa ≥ E1 ≥ 1 MPa.

[0061] When the elastic modulus E1 of the first phase change material plate 1 in the embodiment of the present application is within the above range, the first phase change material plate 1 has a certain compressible deformability. When the first phase change material plate 1 is installed, an interference fit can be adopted between the first phase change material plate 1, the pole 22, and the connecting piece 3 to achieve a better heat exchange effect.

[0062] It can be understood that the elastic modulus E1 of the first phase change material plate 1 in the embodiment of the present application can be selected according to the usage requirements. For example, the elastic modulus E1 is 1 MPa, 2 MPa, 3 MPa, 4 MPa, 5 MPa, 6 MPa, 7 MPa, 8 MPa, 9 MPa, 10 MPa.

[0063] Optionally, the first phase change material plate 1 includes a material piece formed by combining a plastic polymer and the phase change material (for example, paraffin) it contains, and the first phase change material plate 1 will have a certain compressibility.

[0064] Optionally, referring to Figures 1 to 8 as shown, the battery pack further includes a second phase change material plate 4 and a box body 6, and the second phase change material plate 4 is connected between the box body 6 and the plurality of single cells 2.

[0065] Among them, the second phase change material plate 4 is a phase change material piece, and the phase change material refers to a substance that changes its physical state without changing temperature and can provide latent heat. The process of changing physical properties is called a phase change process, and during the phase change process, the phase change material will absorb or release a large amount of latent heat.

[0066] In the embodiment of the present application, the second phase change material plate 4 is connected between the box body 6 and the plurality of single cells 2, and the second phase change material plate 4 plays a role in heat preservation and regulating the temperature of the battery pack. That is, when the battery pack is in a low-temperature situation, the second phase change material plate 4 can release heat during low-temperature phase change, slowing down the decrease in the temperature of the battery pack; when the battery pack is in a high-temperature situation, the second phase change material plate 4 absorbs heat during high-temperature phase change, slowing down the increase in the temperature of the battery pack. The second phase change material plate 4 can avoid temperature shock of the single cells 2 in the battery pack when there is a large temperature change outside the battery pack and during long-term temperature resistance.

[0067] Optionally, referring to Figure 2 , which shows a schematic structural diagram of the second phase change material plate 4 including an inner layer phase change material plate 41 and an outer layer phase change material plate 42. The second phase change material plate 4 includes an inner layer phase change material plate 41 and an outer layer phase change material plate 42. The inner layer phase change material plate 41 is connected between the outer layer phase change material plate 42 and the plurality of single cells 2; the outer layer phase change material plate 42 is connected between the inner layer phase change material plate 41 and the box body 6, and the phase change temperature of the inner layer phase change material plate 41 is greater than the phase change temperature of the outer layer phase change material plate 42.

[0068] In the above battery pack according to the embodiment of the present application, the inner phase change material plate 41 mainly plays a heat absorption role to absorb heat from the single battery 2 and reduce the heat of the single battery 2. The outer phase change material plate 42 mainly plays a heat release role to keep the battery pack warm. Specifically, when the battery pack is in a high-temperature situation, the inner phase change material plate 41 absorbs heat through high-temperature phase change, slowing down the temperature rise of the battery pack; when the battery pack is in a low-temperature situation, the outer phase change material plate 42 releases heat through low-temperature phase change, making the temperature drop of the battery pack slower.

[0069] Optionally, the second phase change material plate 4 includes a phase change material side plate 43; or, the second phase change material plate 4 includes a phase change material side plate 43 and a phase change material bottom plate 44; or, the second phase change material plate 4 includes a phase change material bottom plate 44; both the phase change material side plate 43 and the phase change material bottom plate 44 are used for temperature regulation to avoid temperature shock of the single battery 2 in the battery pack.

[0070] Further referring to Figure 3 , which shows a schematic structural diagram of the second phase change material plate 4 including a phase change material side plate 43 and a phase change material bottom plate 44. The main role of the phase change material side plate 43 is that when there is a huge temperature change outside the battery pack and long-term temperature resistance, the single battery 2 in the battery pack can avoid temperature shock. While adjusting the temperature, since the phase change material bottom plate 44 has a certain buffering ability, it can prevent the single battery 2 from being damaged when impacted by a ball at the bottom.

[0071] Optionally, as shown in Figure 3 , the battery pack further includes a filling body 5, and the filling body 5 is filled between the second phase change material plate 4 and the box body 6.

[0072] In the embodiment of the present application, a filling body 5 is arranged between the second phase change material plate 4 and the box body 6. The filling body 5 can not only fixedly constrain the second phase change material plate 4, but also connect the second phase change material plate 4 and the box body 6 together; moreover, the filling body 5 can play a heat preservation role and enhance the heat preservation effect of the battery pack.

[0073] The embodiment of the present application does not make specific limitations on the filling body 5. For example, the filling body 5 is foaming glue.

[0074] Optionally, the range of the elastic modulus E2 of the second phase change material plate 4 is 10 MPa ≥ E2 ≥ 1 MPa.

[0075] When the elastic modulus E2 of the second phase change material plate 4 in the embodiment of the present application is within the above range, the second phase change material plate 4 has a certain compressible deformability. While the second phase change material plate 4 is used to regulate the temperature of the battery pack, the second phase change material plate 4 also has a certain buffering ability, which can prevent the single battery 2 from being damaged. For example, it can prevent the single battery 2 from being damaged during a bottom ball impact. And during the battery pack assembly process (for example, when multiple single batteries 2 are integrally loaded into the box body 6), it makes the assembly have a certain pre-tightening force, which helps the life cycle of the battery pack; the second phase change material plate 4 can also replace the function of the foam, thereby reducing the use of the foam.

[0076] It can be understood that the elastic modulus E2 of the second phase change material plate 4 in the embodiment of the present application can be selected according to the usage requirements. For example, the elastic modulus E2 is 1 MPa, 2 MPa, 3 MPa, 4 MPa, 5 MPa, 6 MPa, 7 MPa, 8 MPa, 9 MPa, 10 MPa.

[0077] In a specific embodiment, referring to Figure 1 , Figure 5 , Figure 10 As shown, multiple single batteries 2 are arranged along the first direction X and the second direction Y. The single battery 2 includes a battery body 21, a pole column 22 and an explosion-proof valve 23. The pole column 22 and the explosion-proof valve 23 are respectively arranged at the end parts of the battery body 21 in the third direction Z.

[0078] In the third direction Z, the first phase change material plate 1 has a first side 141, a second side 142, a plurality of first through holes 11 and a plurality of second through holes 13. The first side 141 of the first phase change material plate 1 is connected to the end part of the battery body 21 in the third direction Z. A connecting piece 3 is arranged in the groove 12 on the second side 142 of the first phase change material plate 1. The pole column 22 passes through the first through hole 11 at the bottom 122 of the groove 12, and the pole column 22 is connected to the connecting piece 3. The second through hole 13 is arranged corresponding to the explosion-proof valve 23.

[0079] The peripheries and the bottom of the multiple single batteries 2 are connected to the box body 6 through the second phase change material plate 4.

[0080] For the battery pack in the embodiment of the present application, the first phase change material plate 1 is mainly used to cool the battery body 21, the pole column 22 and the connecting piece 3. The first phase change material plate 1 is an insulating part and has insulation ability, which can save the original electrical isolation plate in the battery pack and play a role in cost reduction.

[0081] The second phase change material plate 4 enables the battery pack to withstand higher or lower temperature shocks. When the temperature changes, the second phase change material plate 4 can absorb heat or release heat, providing time for the liquid cooling system in the battery pack to absorb and dissipate heat, and avoiding excessive local temperature rise of the single battery 2.

[0082] In summary, the provision of the first phase change material plate 1 and the second phase change material plate 4 inside the battery pack can optimize the overall thermal management of the battery pack, ensure the capacity and lifespan of the battery pack, as well as ensure the safety and reliability of the battery pack.

[0083] An embodiment of the present application further provides an electrical device, which includes an electrical device body and the battery pack as described above, and the battery pack is connected to the electrical device body.

[0084] When the above battery pack is used in the electrical device, since the first phase change material plate 1 inside the battery pack is used for phase change endothermic, when heat is generated by the battery body 21, the pole column 22, and the connecting piece 3, the first phase change material plate 1 can absorb the heat of the battery body 21, the pole column 22, and the connecting piece 3 through phase change endothermic, realizing the cooling of the battery body 21, the pole column 22, and the connecting piece 3, thereby solving the technical problem of large heat generation near the pole column 22 of the battery pack, ensuring the capacity and lifespan of the battery pack, as well as ensuring the safety and reliability of the battery pack. This makes the electrical device have the advantages of low failure rate, safety, and reliability, and can improve user satisfaction.

[0085] Among them, the electrical device can be a vehicle, can be an energy storage device, such as a mobile energy storage power supply, or can be a mobile terminal, such as electronic devices like mobile phones and cameras. Of course, the above are only examples of the electrical device body and do not constitute a limitation to the present application. In actual applications, technicians can select appropriate electrical devices according to needs.

[0086] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without more limitations, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0087] Each embodiment in this specification is described in a related manner. The same or similar parts between each embodiment can be referred to each other, and the key points of each embodiment are the differences from other embodiments. For embodiments of devices, electronic devices, computer-readable storage media, and computer program products including instructions, since they are basically similar to method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiments.

[0088] The above are only the preferred embodiments of the present utility model and are not intended to limit the protection scope of the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model are included in the protection scope of the present utility model.

Claims

1. A battery pack having a first direction (X), a second direction (Y) and a third direction (Z) intersecting each other, characterized in that: The battery pack comprises a first phase change material plate (1), a plurality of single cells (2) and a plurality of connecting sheets (3); A plurality of the single cells (2) are arranged along the first direction (X) and / or the second direction (Y); the single cells (2) comprise a battery body (21) and a pole (22); the battery body (21) is provided with the pole (22) at an end in the third direction (Z); the connecting piece (3) connects the poles (22) of two adjacent single cells (2) and is spaced apart from the battery body (21) in the third direction (Z); The first phase change material plate (1) is at least partially arranged between the connecting plate (3) and the battery body (21); the first phase change material plate (1) has a first side (141) and a second side (142) which are opposite to each other in the third direction (Z), the first side (141) is connected to the end of the battery body (21) in the third direction (Z), and the second side (142) is connected to the connecting plate (3).

2. The battery pack according to claim 1, characterized in that: The second side (142) is provided with a plurality of grooves (12), the plurality of grooves (12) are arranged along the first direction (X) and / or the second direction (Y), and the connecting piece (3) is at least partially accommodated in the grooves (12).

3. The battery pack according to claim 2, characterized in that: The groove (12) comprises a groove wall (121) and a groove bottom (122); the end of the groove wall (121) close to the battery body (21) is connected to the groove bottom (122); and both the groove wall (121) and the groove bottom (122) are thermally connected to the connecting sheet (3).

4. The battery pack according to claim 3, characterized in that: The slot bottom (122) is provided with a first through hole (11), the pole (22) is passed through the first through hole (11) and is connected to the connecting piece (3); or the connecting piece (3) is passed through the first through hole (11) and is connected to the pole (22).

5. The battery pack according to claim 1, characterized in that: The first phase change material plate (1) is provided with a plurality of second through holes (13), and the plurality of second through holes (13) are arranged along the first direction (X) and / or the second direction (Y); the battery body (21) is provided with an explosion-proof valve (23) at the end in the third direction (Z), and the explosion-proof valve (23) is arranged corresponding to the second through holes (13).

6. The battery pack according to claim 5, characterized in that: The battery pack further comprises a temperature-resistant layer, which is arranged on the first phase change material plate (1) and surrounds the outer periphery of the second through hole (13), and / or the temperature-resistant layer is located on the hole wall of the second through hole (13).

7. The battery pack according to claim 1, characterized in that: The first phase change material plate (1) is an insulating member.

8. The battery pack according to claim 1, characterized in that: The battery pack further comprises a second phase change material plate (4) and a box body (6); the second phase change material plate (4), the first phase change material plate (1), the plurality of single cells (2) and the plurality of connecting plates (3) are all arranged inside the box body (6); the second phase change material plate (4) is connected between the box body (6) and the single cells (2).

9. The battery pack according to claim 8, characterized in that: The second phase change material plate (4) comprises an inner phase change material plate (41) and an outer phase change material plate (42); the inner phase change material plate (41) is connected between the outer phase change material plate (42) and the single battery (2); the outer phase change material plate (42) is connected between the inner phase change material plate (41) and the box (6); the phase change temperature of the inner phase change material plate (41) is greater than the phase change temperature of the outer phase change material plate (42).

10. The battery pack according to claim 8, characterized in that: The battery pack further comprises a filling body (5), wherein the filling body (5) is filled between the second phase change material plate (4) and the box body (6).

11. The battery pack according to claim 8, characterized in that: The elastic modulus E1 of the first phase change material plate (1) satisfies: 10MPa≥E1≥1MPa; and / or the elastic modulus E2 of the second phase change material plate (4) is in the range of 10MPa≥E2≥1MPa.

12. An electrical device, characterized in that: It comprises an electric device body and a battery pack as claimed in any one of claims 1 to 11, wherein the battery pack is connected to the electric device body.

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