Battery pack and electric equipment

Abstract

The utility model discloses a battery pack and electric equipment, and belongs to the technical field of batteries, the battery pack comprises a box body, and the box body is provided with an accommodating cavity; the plurality of batteries are arranged in the accommodating cavity, and each battery comprises a body and a pole arranged on the body; the multiple first phase-change heat exchange pieces are arranged in the containing cavity, at least part of the bodies are connected with the first phase-change heat exchange pieces, and each first phase-change heat exchange piece is connected with at least one body; the plurality of second phase-change heat exchange pieces are arranged in the accommodating cavity, at least part of the pole columns are connected with the second phase-change heat exchange pieces, and each second phase-change heat exchange piece is connected with at least one pole column. According to the invention, the phase change latent heat is utilized to ensure that the body and the pole are at a better working condition temperature, and the temperature uniformity and the use safety of the battery are improved.

Description

Technical Field

[0001] This application belongs to the technical field of batteries, and particularly relates to a battery pack and an electrical device using the same. Background Art

[0002] During the charging and discharging process of a battery pack, a large amount of heat is generated by the battery, which will cause the battery temperature to rise. If the heat cannot be dissipated in time, it will affect the performance of the battery, reduce the cycle life of the battery, and even cause safety accidents. Utility Model Content

[0003] Utility Model Objective: The embodiments of this application provide a battery pack to solve the above technical problems; another objective of this application is to provide an electrical device using the above battery pack.

[0004] Technical Solution: A battery pack described in the embodiments of this application includes:

[0005] A box body, which has a receiving cavity;

[0006] Multiple batteries, which are arranged in the receiving cavity. Each battery includes a body and a pole column arranged on the body;

[0007] Multiple first phase change heat exchangers, which are all arranged in the receiving cavity. At least part of the bodies are connected to the first phase change heat exchangers, and each first phase change heat exchanger is connected to at least one body;

[0008] Multiple second phase change heat exchangers, which are all arranged in the receiving cavity. At least part of the pole columns are connected to the second phase change heat exchangers, and each second phase change heat exchanger is connected to at least one pole column.

[0009] In some embodiments, the battery pack has a first direction, and at least part of the batteries are arranged along the first direction;

[0010] In the first direction, a first phase change heat exchanger is arranged between adjacent bodies.

[0011] In some embodiments, the first phase change heat exchanger includes a first phase change layer, a first heat insulation layer, and a second phase change layer that are stacked in the first direction;

[0012] In the first direction, one of the adjacent bodies is connected to the first phase change layer, and the other is connected to the second phase change layer.

[0013] In some embodiments, the battery pack further has a second direction that intersects the first direction;

[0014] The body has a first side wall oppositely arranged in the first direction and a second side wall oppositely arranged in the second direction. The first side wall and the second side wall are connected, and the area of the first side wall is larger than that of the second side wall.

[0015] In the first direction, the first phase change heat exchanger is respectively connected to the adjacent first side walls.

[0016] In some embodiments, the battery pack further has a third direction intersecting the first direction.

[0017] The second phase change heat exchanger and the pole column are arranged in the third direction, and the second phase change heat exchanger is connected to the pole column.

[0018] In some embodiments, in the first direction, each second phase change heat exchanger is respectively connected to the pole columns of at least two adjacent batteries.

[0019] In some embodiments, the second phase change heat exchanger includes a third phase change layer and a second heat insulation layer stacked in the third direction, and the third phase change layer is connected to the pole column.

[0020] In some embodiments, the battery pack further includes a third heat exchanger. In the first direction, the third heat exchanger is arranged between the battery and the box body, and the third heat exchanger is respectively connected to the battery and the box body.

[0021] In some embodiments, the battery pack further has a third direction intersecting the first direction.

[0022] The battery pack further includes a liquid cooling part. The liquid cooling part is arranged in the accommodation cavity and connected to the box body. The liquid cooling part and the battery are arranged in the third direction, and the battery is connected to the liquid cooling part.

[0023] Correspondingly, an electrical equipment according to an embodiment of the present application includes the above-mentioned battery pack.

[0024] Beneficial effects: The battery pack according to the embodiment of the present application includes a box body, a plurality of batteries, a plurality of first phase change heat exchangers, and a plurality of second phase change heat exchangers. The box body has a receiving cavity, and the plurality of batteries are arranged in the receiving cavity. The battery includes a main body and a pole column arranged on the main body. The plurality of first phase change heat exchangers are all arranged in the receiving cavity, at least part of the main body is connected to a first phase change heat exchanger, and each first phase change heat exchanger is connected to at least one main body. The plurality of second phase change heat exchangers are all arranged in the receiving cavity, at least part of the pole columns are connected to the second phase change heat exchangers, and each second phase change heat exchanger is connected to at least one pole column. By utilizing the latent heat of phase change, when the temperature of the main body and the pole column is too high or too low, the first phase change heat exchanger can exchange heat with the main body in time, and the second phase change heat exchanger can exchange heat with the pole column in time, thereby facilitating the battery to be at a better temperature, improving the temperature uniformity and use safety of the battery. In addition, compared with applying heat exchange structures such as liquid cooling plates to the main body and the pole column, the first phase change heat exchanger and the second phase change heat exchanger do not require additional connection structures and circulating cooling media, and the uniformity and stability of heat conduction are better, which is beneficial to reducing the impact on the overall weight of the battery pack. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0026] Figure 1 is a schematic structural diagram of the battery pack according to the embodiment of the present application;

[0027] Figure 2 is an exploded structural diagram of the battery pack according to the embodiment of the present application;

[0028] Figure 3 is a partial structural diagram of the battery arrangement according to the embodiment of the present application;

[0029] Figure 4 is a schematic layout diagram of the first phase change heat exchanger and the second phase change heat exchanger according to the embodiment of the present application;

[0030] Figure 5 is a schematic structural diagram of the first phase change heat exchanger according to the embodiment of the present application;

[0031] Figure 6 is a schematic structural diagram of the second phase change heat exchanger according to the embodiment of the present application;

[0032] Figure 7 is a schematic layout diagram of the third heat exchanger according to the embodiment of the present application;

[0033] Figure 8It is a schematic structural diagram of the third heat exchanger in the embodiment of the present application;

[0034] Figure 9 It is an exploded structural diagram of the liquid cooling component in the embodiment of the present application;

[0035] Reference numerals: 1, box body; 10, accommodation cavity; 11, busbar cavity; 12, substrate; 13, frame; 14, cross beam; 15, cover body; 2, battery; 20, body; 200, first side wall; 201, second side wall; 21, pole column; 3, first phase change heat exchanger; 30, first phase change layer; 31, first heat insulation layer; 32, second phase change layer; 4, second phase change heat exchanger; 40, third phase change layer; 41, second heat insulation layer; 5, liquid cooling component; 50, liquid cooling flow channel; 51, inlet joint; 52, outlet joint; 53, first plate body; 54, second plate body; 6, fixing beam; 7, third heat exchanger; 70, fourth phase change layer; 71, third heat insulation layer; X, first direction; Y, second direction; Z, third direction. Detailed implementation manners

[0036] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present application.

[0037] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the 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 element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of 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 quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality" means two or more, and at least one means one, two or more, unless otherwise specifically defined.

[0038] With the increasing requirements for the energy density and charging rate of the battery pack, the thermal management system of the battery pack undoubtedly needs to bear greater pressure, which affects the safety of the battery system.

[0039] Most of the thermal management systems of battery packs are laid in the battery pack in the form of liquid cooling plates. The batteries are arranged on the liquid cooling plates, and heat exchange with the batteries is achieved by introducing a heat exchange medium into the liquid cooling plates. However, with the increase in the energy density and charging rate of the battery pack, there are problems such as insufficient heat dissipation, too high overall temperature, and too large temperature difference at the pole columns in the battery heating conditions. Continuing to increase the liquid cooling plates not only affects the battery layout structure, but also requires additional structures such as the circulation pipelines of the heat exchange medium, resulting in excessive occupation of the battery pack space and increasing the overall weight of the battery pack.

[0040] In view of this, in combination with Figures 1 to 9 , the embodiments of the present application provide a battery pack, aiming to overcome at least one of the above technical problems.

[0041] It should be noted that in the following embodiments, the first direction X, the second direction Y, and the third direction Z that intersect pairwise are introduced. Among them, the first direction X is substantially parallel to the length direction of the overall battery pack, the second direction Y is substantially parallel to the width direction of the overall battery pack, and the third direction Z is substantially parallel to the thickness direction of the overall battery pack.

[0042] Referring to Figures 1 to 9 , a battery pack includes a box body 1, a plurality of batteries 2, a plurality of first phase change heat exchange elements 3, and a plurality of second phase change heat exchange elements 4.

[0043] Among them, the box body 1 has an accommodation cavity 10, a plurality of batteries 2 are arranged in the accommodation cavity 10, the battery 2 includes a body 20 and a pole column 21 arranged on the body 20. A plurality of first phase change heat exchange elements 3 are all arranged in the accommodation cavity 10, at least part of the body 20 is connected with a first phase change heat exchange element 3, and each first phase change heat exchange element 3 is connected with at least one body 20. A plurality of second phase change heat exchange elements 4 are all arranged in the accommodation cavity 10, at least part of the pole column 21 is connected with a second phase change heat exchange element 4, and each second phase change heat exchange element 4 is connected with at least one pole column 21.

[0044] It should be noted that phase change is the mutual transformation between different phases. By utilizing the latent heat of phase change, when the temperature of the body 20 and the pole column 21 is too high or too low, the first phase change heat exchange element 3 can exchange heat with the body 20 in time, and the second phase change heat exchange element 4 can exchange heat with the pole column 21 in time, which is beneficial to keeping the battery 2 at a better temperature, improving the temperature uniformity and use safety of the battery 2. In addition, compared with applying heat exchange structures such as liquid cooling plates to the body 20 and the pole column 21, the first phase change heat exchange element 3 and the second phase change heat exchange element 4 do not require additional connection structures and circulating cooling media, and the heat conduction is more uniform and stable, which is beneficial to reducing the impact on the overall weight of the battery pack.

[0045] Specifically, the first phase change heat exchanger 3 and the second phase change heat exchanger 4 in this embodiment may adopt solid-liquid phase change materials. When the main body 20 and the terminal post 21 generate heat to the phase change temperature, the phase change materials of the first phase change heat exchanger 3 and the second phase change heat exchanger 4 change from solid state to liquid state, thereby absorbing the heat generated by the battery 2 by using the latent heat of phase change to reduce the overall temperature of the battery 2. When the temperature is too low, the phase change materials of the first phase change heat exchanger 3 and the second phase change heat exchanger 4 change from liquid state to solid state, which can achieve the effect of heat release to increase the overall temperature of the battery 2.

[0046] Compared with the circulation of the cooling medium in the liquid cooling plate, the first phase change heat exchanger 3 and the second phase change heat exchanger 4 using phase change materials can absorb or release a large amount of heat with a smaller material volume. At the same time, the phase change material has good heat conduction performance during the phase change process, which can help the heat be evenly distributed throughout the material volume, avoiding the problems of too high or too low local temperature, and is beneficial to improving the temperature uniformity.

[0047] In some embodiments, referring to Figures 2 to 4 , at least part of the batteries 2 are arranged along the first direction X, and the first phase change heat exchanger 3 is provided between adjacent main bodies 20 in the first direction X.

[0048] Specifically, in this embodiment, taking the example that four columns of batteries 2 are arranged in sequence along the second direction Y in the accommodation cavity 10, each column of batteries 2 is arranged along the first direction X. In other embodiments, the number of columns of batteries 2 and the number of batteries 2 in each column can be flexibly adjusted according to the size of the box body 1 and the accommodation cavity 10 and the requirements of the battery pack specifications, which will not be elaborated here.

[0049] In some embodiments, referring to Figure 3 and Figure 5 , the first phase change heat exchanger 3 includes a first phase change layer 30, a first heat insulation layer 31 and a second phase change layer 32 stacked in the first direction X. In the first direction X, one of the adjacent main bodies 20 is connected to the first phase change layer 30, and the other is connected to the second phase change layer 32.

[0050] The first heat insulation layer 31 can adopt lightweight heat insulation materials such as aerogel materials. The first heat insulation layer 31 is beneficial to preventing heat transfer between adjacent batteries 2 in the first direction X, reducing the heat generation influence of adjacent batteries 2, and is beneficial to improving the safety of the battery pack.

[0051] In addition, in some embodiments, referring to Figures 2 to 5 , the main body 20 has a first side wall 200 oppositely arranged in the first direction X and a second side wall 201 oppositely arranged in the second direction Y. The first side wall 200 and the second side wall 201 are connected, and the area of the first side wall 200 is larger than the area of the second side wall 201. In the first direction X, the first phase change heat exchanger 3 is respectively connected to the adjacent first side walls 200.

[0052] The first phase change layer 30 and the second phase change layer 32 can flexibly adjust the fitting area relative to the body 20 as needed. In this embodiment, it is taken as an example to generally cover the first side wall 200. It can be understood that the first phase change heat exchanger 3 is attached to the side wall of the body 20 with a larger area to ensure a larger heat exchange contact area between the first phase change heat exchanger 3 and the body 20, and to ensure the heat exchange effect of the first phase change heat exchanger 3.

[0053] In some embodiments, referring to Figures 2 to 4 , the second phase change heat exchanger 4 and the pole column 21 are arranged in the third direction Z, and the second phase change heat exchanger 4 is connected to the pole column 21.

[0054] In other embodiments, it can be understood that, when the bus bar arrangement space of the pole column 21 permits, the second phase change heat exchanger 4 can also be partially sleeved on the outer periphery of the pole column 21 to increase the contact area with the pole column 21.

[0055] In some embodiments, referring to Figures 2 to 4 , in the first direction X, each second phase change heat exchanger 4 is respectively connected to the pole columns 21 of at least two adjacent batteries 2.

[0056] In this embodiment, it is taken as an example that each second phase change heat exchanger 4 is connected to the adjacent two pole columns 21 of the adjacent two batteries 2. In other embodiments, the number of pole columns 21 connected can be flexibly adjusted according to the space arrangement and the size specifications of the second phase change heat exchanger 4, which will not be elaborated here. The second phase change heat exchanger 4 can be connected to the pole column 21 in the form of thermal conductive adhesive or the like.

[0057] Specifically, in some embodiments, referring to Figure 3 and Figure 6 , the second phase change heat exchanger 4 includes a third phase change layer 40 and a second heat insulation layer 41 stacked in the third direction Z, and the third phase change layer 40 is connected to the pole column 21.

[0058] The second heat insulation layer 41 can also adopt an aerogel material. By blocking between the third phase change layer 40 and the cover body 15 through the second heat insulation layer 41, it is beneficial to prevent the heat transfer of the pole column 21 towards the cover body 15 in the third direction Z, reduce the heating influence of the pole column 21 on other areas, and is beneficial to improving the safety of the battery pack.

[0059] In some embodiments, referring to Figure 1 and Figure 2 , in the third direction Z, the box body 1 sequentially includes a base plate 12, a frame 13 surrounding and connecting the base plate 12, and a cover body 15 covering the frame 13. The box body 1 further includes two cross beams 14, and the two cross beams 14 are arranged at intervals in the first direction X. The batteries 2 are arranged between the two cross beams 14. The base plate 12, the frame 13, the cover body 15, and the two cross beams 14 enclose the above-mentioned accommodation cavity 10.

[0060] On the third direction Z, a fixing beam 6 is pressed against the side of the battery 2 away from the substrate 12. There are four fixing beams 6 corresponding to the four columns of batteries 2. Each fixing beam 6 extends along the first direction X, and each fixing beam 6 is fixedly connected to two cross beams 14 and pressed against the corresponding column of batteries 2. The constraints on the battery 2 are formed by the fixing beam 6 and the cross beam 14, improving the stability of the battery 2 disposed in the accommodation cavity 10.

[0061] In some embodiments, referring to Figure 7 and Figure 8 , the battery pack further includes a third heat exchanger 7. In the first direction X, a third heat exchanger 7 is provided between the battery 2 and the box body 1, and the third heat exchanger 7 is respectively connected to the battery 2 and the box body 1.

[0062] Specifically, the third heat exchanger 7 can adopt a phase change heat exchanger similar to the first phase change heat exchanger 3 and the second phase change heat exchanger 4. Referring to Figure 8 , the third heat exchanger 7 can include a fourth phase change layer 70 and a third heat insulation layer 71 stacked along the first direction X. The fourth phase change layer 70 is connected to the body 20, and the third heat insulation layer 71 is connected to the cross beam 14.

[0063] The third heat insulation layer 71 can also adopt an aerogel material. Blocked between the fourth phase change layer 70 and the cross beam 14 by the third heat insulation layer 71, it is beneficial to prevent the heat transfer of the body 20 towards the cross beam 14 in the first direction X, so as to reduce the heat influence between adjacent batteries 2 in the second direction Y through the cross beam 14, which is beneficial to improving the safety of the battery pack.

[0064] By supplementing the third heat exchanger 7 on the opposite sides of the batteries 2 at both ends of each column of batteries 2, the heat exchange temperature uniformity of the battery 2 is further improved, and the safety of the battery pack is improved.

[0065] It can be understood that in other embodiments, the third heat exchanger 7 can also adopt other heat exchange structural components such as a liquid cooling plate, which will not be elaborated here.

[0066] In some embodiments, referring to Figure 2 and Figure 9 , the battery pack further includes a liquid cooling component 5. The liquid cooling component 5 is disposed in the accommodation cavity 10 and connected to the box body 1. The liquid cooling component 5 and the battery 2 are arranged in the third direction Z, and the battery 2 is connected to the liquid cooling component 5.

[0067] Specifically, the liquid cooling component 5 can adopt a liquid cooling plate and be laid on the substrate 12. The liquid cooling component 5 includes a first plate body 53 and a second plate body 54 stacked in the third direction Z. In this embodiment, taking the example that the side of the second plate body 54 facing the first plate body 53 is recessed to form a liquid cooling channel 50, after the first plate body 53 and the second plate body 54 are connected, the liquid cooling channel 50 is sealed.

[0068] An inlet joint 51 and an outlet joint 52 communicating with the liquid cooling flow channel 50 are respectively arranged on the first plate body 53, and the inlet joint 51 and the outlet joint 52 communicate with two ends of the liquid cooling flow channel 50 respectively.

[0069] Referring to Figure 3 , a confluence cavity 11 is also formed between the cross beam 14 and the frame 13. The confluence cavity 11 and the accommodation cavity 10 are separated by the cross beam 14. One ends of the inlet joint 51 and the outlet joint 52 far away from the liquid cooling part 5 penetrate through the cross beam 14 along the first direction X and are arranged in the confluence cavity 11. The confluence cavity 11 is used for centrally arranging the connection structures required for the circulation of the cooling medium, which will not be elaborated here.

[0070] By simultaneously laying the liquid cooling part 5 at the bottom of the battery 2 and cooperating with the first phase change heat exchange part 3, the second phase change heat exchange part 4 and the third heat exchange part 7, the cooling effect on the battery 2 is synchronously formed, so as to improve the temperature uniformity of each battery 2 and the safety of the overall battery pack.

[0071] Correspondingly, an embodiment of the present application provides an electrical equipment, and the electrical equipment includes the above-mentioned battery pack. The electrical equipment can be an electronic device, a power storage device, or a power vehicle and other devices. It can be understood that the electrical equipment can have all the technical features and corresponding beneficial effects of the above-mentioned battery pack, which will not be elaborated here.

[0072] The above has introduced in detail a battery pack and an electrical equipment provided by an embodiment of the present application, and specific examples are used to elaborate the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application; 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 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: A box body, wherein the box body has a containing cavity; A plurality of batteries, wherein the plurality of batteries are arranged in the accommodation cavity, and the battery comprises a body and a pole arranged on the body; A plurality of first phase-change heat exchange elements, wherein the plurality of the first phase-change heat exchange elements are all arranged in the accommodating cavity, at least part of the body is connected to the first phase-change heat exchange element, and each of the first phase-change heat exchange elements is connected to at least one of the bodies; A plurality of second phase-change heat exchange elements are provided in the accommodating cavity, at least some of the poles are connected to the second phase-change heat exchange element, and each of the second phase-change heat exchange elements is connected to at least one of the poles.

2. The battery pack according to claim 1, characterized in that: The battery pack has a first direction, and at least some of the batteries are arranged along the first direction; In the first direction, the first phase change heat element is disposed between adjacent bodies.

3. The battery pack according to claim 2, characterized in that: The first phase change heat element comprises a first phase change layer, a first heat insulation layer and a second phase change layer stacked in the first direction; In the first direction, one of the adjacent bodies is connected to the first phase change layer, and the other is connected to the second phase change layer.

4. The battery pack according to claim 2, characterized in that: The battery pack also has a second direction intersecting the first direction; The body comprises a first side wall disposed opposite to each other in the first direction and a second side wall disposed opposite to each other in the second direction, the first side wall and the second side wall are connected, and an area of ​​the first side wall is greater than an area of ​​the second side wall; In the first direction, the first phase change heat transfer elements are respectively connected to adjacent first side walls.

5. The battery pack according to claim 2, characterized in that: The battery pack also has a third direction intersecting the first direction; The second phase-change heat transfer element and the pole are arranged in the third direction, and the second phase-change heat transfer element is connected to the pole.

6. The battery pack according to claim 5, characterized in that: In the first direction, each of the second phase-change heat elements is respectively connected to the poles of at least two adjacent batteries.

7. The battery pack according to claim 5, characterized in that: The second phase change heat transfer element includes a third phase change layer and a second heat insulation layer stacked in the third direction, and the third phase change layer is connected to the pole.

8. The battery pack according to claim 2, characterized in that: The battery pack further includes a third heat exchange member. In the first direction, the third heat exchange member is disposed between the battery and the box, and the third heat exchange member is respectively connected to the battery and the box.

9. The battery pack according to claim 2, characterized in that: The battery pack also has a third direction intersecting the first direction; The battery pack further includes a liquid cooling element, which is disposed in the accommodating cavity and connected to the box body. The liquid cooling element and the battery are arranged in the third direction, and the battery is connected to the liquid cooling element.

10. An electrical device, characterized in that: A battery pack comprising the battery pack as claimed in any one of claims 1 to 9.

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