Heat dissipation battery structure

Abstract

The utility model provides a heat dissipation battery structure which comprises a battery body and a heat conduction plate, the heat conduction plate is arranged outside a shell on at least one side of the battery body, and at least part of the shell of the battery body is in heat conduction contact with the shell of the battery body. And the heat conducting plate is wrapped and fixed outside the battery body through a first insulating film to form the heat dissipation battery structure. According to the heat dissipation battery structure, under the condition that the heat dissipation performance of the battery is not influenced, the influence on the energy density of the lithium battery can be reduced, the assembly difficulty of an existing lithium battery heat dissipation scheme is also reduced, and the problem that the heat conduction plate and the battery are easy to damage in the processes of transportation, assembly, disassembly and the like is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, and particularly relates to a heat dissipation battery structure. Background Art

[0002] With the continuous expansion of the application of lithium batteries in the new energy market, battery heat dissipation has also begun to become an issue of concern in the new energy industry. The core problem of lithium battery heat dissipation lies in the poor heat dissipation ability of the battery itself, and conventional heat dissipation solutions represented by water cooling often have the problem of uneven heat dissipation. Therefore, the main direction of lithium battery heat dissipation lies in how to improve the thermal conductivity of the battery itself and reduce the unevenness of heat dissipation.

[0003] In the related art, heat dissipation components are arranged between batteries. However, the following problems generally exist in these solutions: the assembly difficulty between the heat dissipation components and the lithium batteries is large, the heat dissipation design is complex, various heat dissipation structures seriously affect the energy density of the lithium batteries, and the heat dissipation components and the heat dissipation batteries are easily damaged during transportation, assembly, disassembly, etc. Summary of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the utility model provides a heat dissipation battery structure, which can reduce the influence on the energy density of the lithium battery and lower the assembly difficulty of the existing lithium battery heat dissipation solutions without affecting the heat dissipation performance of the battery, and avoid the problem that the heat conduction plate and the battery are easily damaged during transportation, assembly, disassembly, etc.

[0005] The technical solution of the utility model is realized as follows:

[0006] On the one hand, the utility model provides a heat dissipation battery structure, including a battery body and a heat conduction plate. The heat conduction plate is arranged outside at least one side shell of the battery body, at least part of the shell of the battery body is in heat conduction contact with the shell of the battery body, and the heat conduction plate is wrapped and fixed outside the battery body through a first insulating film to form the heat dissipation battery structure.

[0007] Preferably, the heat conduction plate includes a first side surface and a second side surface arranged opposite to each other. A second insulating film is attached to the first side surface, and the second insulating film fits the outer shell of the battery body and is in heat conduction contact.

[0008] Preferably, the first insulating film is a blue film.

[0009] Preferably, the heat conduction plate is a heat pipe.

[0010] Preferably, the heat pipe includes, but is not limited to, a copper-based water-cooled heat pipe, an aluminum heat pipe, and a stainless steel heat pipe.

[0011] Preferably, the battery body includes a first side wall and a second side wall which are oppositely arranged, and a third side wall and a fourth side wall which are oppositely arranged, and further includes a top wall and a bottom wall which are oppositely arranged to enclose the battery body. The area of the first side wall is larger than that of the third side wall. The heat conducting plate is fixedly wrapped on the first side wall through the first insulating film.

[0012] Preferably, the heat conducting plate is also arranged on the second side wall. The heat conducting plates on the first side wall and the second side wall are fixedly wrapped outside the battery body through winding and wrapping with the first insulating film.

[0013] Preferably, the heat conducting plate is also arranged on the top wall and / or the bottom wall. The heat conducting plates on the top wall and / or the bottom wall are fixedly wrapped outside the battery body through winding and wrapping with the first insulating film.

[0014] Preferably, the heat conducting plates on the outer walls of the battery body are of an integral structure and are wrapped outside the battery body and are in heat conducting contact with the battery body.

[0015] Preferably, the side wall of the battery body provided with the heat conducting plate can be completely covered by the heat conducting plate.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] The heat dissipation battery structure of the utility model includes a battery body and a heat conducting plate. The heat conducting plate is arranged outside at least one side shell of the battery body. The heat conducting plate is in heat conducting contact with the battery body. The heat conducting plate is fixedly wrapped outside the battery body through the first insulating film to form the heat dissipation battery structure, so that the battery body and the heat conducting plate form an integrated combined structure, reducing the assembly difficulty of the existing lithium battery heat dissipation scheme. Moreover, after the battery body and the heat conducting plate form an integral structure through wrapping with the first insulating film in the utility model, the collision between the heat conducting plate and each battery body can also be greatly reduced, avoiding the damage problems of the heat conducting plate and the battery body during transportation, assembly, disassembly and the like. In addition, when assembling a battery module by using the utility model, since there is no need to install the heat conducting plate, the influence on the energy density of the lithium battery can be reduced. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a schematic three-dimensional structure diagram of an embodiment of the heat dissipation battery structure of the present utility model;

[0020] Figure 2 It is a schematic cross-sectional structure diagram of an embodiment of the heat dissipation battery structure of the present utility model;

[0021] Figure 3 is Figure 2 the detailed view of A-A in

[0022] Figure 4 It is a schematic cross-sectional structure diagram of another embodiment of the heat dissipation battery structure of the present utility model;

[0023] Figure 5 It is a schematic cross-sectional structure diagram of yet another embodiment of the heat dissipation battery structure of the present utility model;

[0024] Figure 6 It is a schematic cross-sectional structure diagram of still another embodiment of the heat dissipation battery structure of the present utility model;

[0025] Figure 7 It is a schematic cross-sectional structure diagram of one of the embodiments of the heat dissipation battery structure of the present utility model;

[0026] Figure 8 It is a schematic cross-sectional structure diagram of yet another one of the embodiments of the heat dissipation battery structure of the present utility model;

[0027] Figure 9 is Figure 8 the three-dimensional structure diagram of the shown embodiment;

[0028] Figure 10 is Figure 9 or Figure 6 the schematic top cross-sectional structure diagram of the heat dissipation battery structure in

[0029] Reference numerals in the drawings: 1 battery body; 101 first side wall; 102 second side wall; 103 third side wall; 104 fourth side wall; 105 top wall; 106 bottom wall; 2 heat conducting plate; 201 first side; 202 second side; 3 first insulating film; 4 second insulating film; 5 positive and negative electrode tabs; 6 pressure relief valve. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0031] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model 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 to the present utility model. In addition, the terms "first", "second", "third", "fourth", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0032] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0033] This embodiment provides a heat dissipation battery structure and a battery module, which will be described in detail below. It should be noted that the description order of the following embodiments does not limit the preferred order of the embodiments.

[0034] See Figures 1 - 10 , the embodiment of the present utility model discloses a heat dissipation battery structure, including a battery body 1011 and a heat conduction plate 2. The heat conduction plate 2 is arranged outside at least one side shell of the battery body 1011, and at least part of the shell of the battery body 1011 is in heat conduction contact with the shell of the battery body 1011. The heat conduction plate 2 is wrapped and fixed outside the battery body 1011 through a first insulating film 3 to form the heat dissipation battery structure.

[0035] It should be noted that in related designs, lithium batteries generate heat during high-power charging and discharging. In order to quickly dissipate the heat of lithium batteries, heat dissipation components are arranged between the batteries. However, the following problems generally exist in these solutions: the assembly difficulty between the heat dissipation components and the lithium batteries is large, the heat dissipation design is complex, various heat dissipation structures seriously affect the energy density of the lithium batteries, and the heat dissipation components and the heat dissipation batteries are easily damaged during transportation, assembly, disassembly, etc.

[0036] It can be understood that in the heat dissipation battery structure of this embodiment, a heat conduction plate 2 is arranged outside the housing on at least one side of the battery body 1011. The heat conduction plate 2 is in heat conduction contact with the battery body 1011, and then the heat conduction plate 2 is wrapped and fixed outside the battery body 1011 through a first insulating film 3 to form the heat dissipation battery structure, so that the battery body 1011 and the heat conduction plate 2 form an integrated combined structure. When assembling into a battery module, it is only necessary to assemble the heat dissipation battery structure of this embodiment in the same direction, and there is no longer a need to consider the assembly problem of the heat conduction plate 2, greatly reducing the assembly difficulty of the existing lithium battery heat dissipation scheme; moreover, in the present utility model, after the battery body 1011 and the heat conduction plate 2 form an integral structure through the wrapping of the first insulating film 3, they have formed a whole, and the heat conduction plate 2 and the battery are no longer movably connected. Therefore, the collision between the heat conduction plate 2 and each battery body 1011 can be greatly reduced, and the damage problems of the heat conduction plate 2 and the battery body 1011 during transportation, assembly, disassembly, etc. can be avoided. In addition, when assembling a battery module using the present utility model, since there is no longer a need to consider the problem of installing the heat conduction plate 2 between the batteries, the influence on the energy density of the lithium battery can be reduced.

[0037] Among them, as Figure 3 shown, the heat conduction plate 2 includes a first side surface 201 and a second side surface 202 arranged opposite to each other. A second insulating film 4 is attached to the first side surface 201, and the second insulating film 4 fits the outer shell of the battery body 1011 and is in heat conduction contact; in this embodiment, a second insulating film 4 is arranged between the battery body 1011 and the heat conduction plate 2, and the second insulating film 4 fits the battery body 1011 and the heat conduction plate 2 to ensure that there is close contact without obvious gaps between the second insulating layer and the housing of the battery body 1011, and between the second insulating layer and the heat conduction plate 2, and it can also play an insulating and protective role.

[0038] In this embodiment, the heat conduction plate 2 is arranged outside the housing on at least one side of the battery body 1011. That is to say, the heat conduction plate 2 can be arranged on one side outside the housing of the battery body 1011 (as Figure 2 shown), or the heat conduction plate 2 can be arranged on multiple sides outside the housing of the battery body 1011 (as Figures 4 - 7 shown), and this embodiment does not make any restrictions here.

[0039] The following can be specifically elaborated in combination with specific embodiments.

[0040] Before the description, the structure of the battery body 1011 will be specifically described first: In the embodiment, specifically, as Figure 1 , Figure 2 and Figure 9As shown, the battery body 1011 includes a first side wall 101 and a second side wall 102 that are oppositely arranged, and a third side wall 103 and a fourth side wall 104 that are oppositely arranged. It also includes a top wall 105 and a bottom wall 106 that are oppositely arranged to enclose the battery body 1011. The area of the first side wall 101 is larger than the area of the third side wall 103. That is, in this embodiment, the battery body 1011 is a regular hexahedron, and the area of one pair of symmetric side walls (i.e., the first side wall 101 and the second side wall 102) is larger than the area of the other pair of symmetric side walls (i.e., the third side wall 103 and the fourth side wall 104).

[0041] In one embodiment, as Figure 2 shown, the heat conducting plate 2 is wrapped and fixed on the first side wall 101 through the first insulating film 3. That is, when the heat conducting plate 2 is provided on only one side wall of the housing of the battery body 1011, the heat conducting plate 2 is arranged on the single large side surface (i.e., the first side wall 101 or the second side wall 102) of the battery body 1011 to better increase the contact area between the heat conducting plate 2 and the battery body 1011 for rapid heat dissipation.

[0042] In another embodiment, as Figure 4 shown, the heat conducting plate 2 is also provided on the second side wall 102. The heat conducting plates 2 on the first side wall 101 and the second side wall 102 are wrapped and fixed outside the battery body 1011 through the first insulating film 3. That is, when the heat conducting plate 2 is provided on only two side walls of the housing of the battery body 1011, the heat conducting plates 2 are respectively arranged on two opposite single large side surfaces of the battery body 1011, which can better increase the contact area between the heat conducting plate 2 and the battery body 1011 for rapid heat dissipation.

[0043] In addition to the above two embodiments, the heat conducting plate 2 can also be provided on the top wall 105 and / or the bottom wall 106. The heat conducting plate 2 on the top wall 105 and / or the bottom wall 106 is wrapped and fixed outside the battery body 1011 through the first insulating film 3.

[0044] For example, in another embodiment, as Figure 5 shown, the heat conducting plate 2 can be arranged on one single large side surface (i.e., the first side wall 101 or the second side wall 102) of the battery body 1011 and the top wall 105 or the bottom wall 106. At this time, an L-shaped heat conducting plate 2 can be used to wrap one single large side surface of the battery body 1011 and the top wall 105 or the bottom wall 106.

[0045] Or, as Figure 6As shown, heat conduction plates 2 are arranged on one of the large single sides (i.e., the first side wall 101 or the second side wall 102), the top wall 105, and the bottom wall 106 of the battery body 1011. At this time, a C-shaped heat conduction plate 2 can be used to wrap one of the large single sides, the top wall 105, and the bottom wall 106 of the battery body 1011 at the same time.

[0046] Or, as Figure 7 shown, heat conduction plates 2 are arranged on both large single sides (i.e., the first side wall 101 and the second side wall 102) of the battery body 1011 and the top wall 105 or the bottom wall 106. At this time, a U-shaped heat conduction plate 2 can be used to wrap both large single sides and the top wall 105 or the bottom wall 106 of the battery body 1011 at the same time.

[0047] Or, as Figure 8 and Figure 9 shown, heat conduction plates 2 are arranged on both large single sides (i.e., the first side wall 101 and the second side wall 102), the top wall 105, and the bottom wall 106 of the battery body 1011. At this time, a square tubular heat conduction plate 2 can be used to wrap both large single sides, the top wall 105, and the bottom wall 106 of the battery body 1011 at the same time.

[0048] In the above embodiments, preferably, the heat conduction plates 2 on the outer walls of the battery body 1011 are of an integral structure, wrapping outside the battery body 1011 and being in thermal contact with the battery body 1011. In this embodiment, different-shaped integral heat conduction plate 2 structures are adopted for different situations, which can not only greatly reduce the assembly difficulty of the heat dissipation battery structure, but also improve the overall stability of the heat dissipation battery structure, and at the same time can meet the battery heat dissipation requirements. In addition to the flat plate type, L type, C type, U type, and square tubular heat conduction plates 2 mentioned in this embodiment, other-shaped heat conduction plates 2 can also be used for assembly, such as assembling flat plate types to form L types, C types, U types, and square tubular shapes, or assembling several of the above flat plate types, L types, C types, and U types to adapt to the above various embodiments, which are also within the protection scope of the present invention.

[0049] In the above embodiments, the first insulating film 3 is preferably a blue film, which has better wrapping performance and insulating effect.

[0050] In the above embodiments, the heat conduction plate 2 is preferably a heat pipe. It should be noted that in order to improve the heat dissipation effect, the heat pipe can be prepared from a high thermal conductivity material based on the phase change heat transfer principle, such as copper-based, aluminum-based, stainless steel-based, or alloy materials. In addition, the heat conduction plate 2 can also be a heat dissipation component with good heat dissipation performance, such as a graphene sheet or a high thermal conductivity metal sheet, which is also within the protection scope of the present invention.

[0051] When the heat conducting plate 2 is a heat pipe, the vertical thermal conductivity of the heat pipe should be not less than 1000 W / (m·k) to meet the heat dissipation requirements of large-capacity lithium batteries.

[0052] In a preferred embodiment of the present utility model, the heat pipe includes, but is not limited to, a copper-based water-cooled heat pipe, an aluminum heat pipe, and a stainless steel heat pipe; using a copper-based water-cooled heat pipe, an aluminum heat pipe, and a stainless steel heat pipe can not only ensure good heat dissipation, but also ensure that the thickness of the heat pipe is small, thereby reducing the impact on the energy density of the lithium battery; among them, the heat pipe is preferably a copper-based water-cooled heat pipe with a thickness less than 1 mm. Since the thickness of the copper-based water-cooled heat pipe is not greater than 1 mm, it can greatly reduce the impact on the energy density of the lithium battery.

[0053] In the above embodiments, the second edge film is an insulating film with interfacial heat transfer ability, and the thermal conductivity of the second insulating film 4 should be not less than 0.1 W / (m·k) to ensure that the heat generated on the battery body 1011 can be quickly transferred to the heat conducting plate 2.

[0054] Furthermore, the side wall of the battery body 1011 where the heat conducting plate 2 is provided can be fully covered by the heat conducting plate 2 to achieve a better heat dissipation effect.

[0055] In one embodiment of the present utility model, as Figure 9 and Figure 10 shown, the heat dissipation battery structure further includes positive and negative electrode tabs 5 provided on the top wall 105 of the battery body 1011. When a heat conducting plate 2 is provided outside the top wall 105, through holes adapted to the positive and negative electrode tabs 5 can be processed on the heat conducting plate 2 to avoid interference with the electrode tabs.

[0056] Furthermore, in this embodiment, as Figure 9 and Figure 10 shown, in addition to providing positive and negative electrode tabs 5 on the top wall 105 of the battery body 1011, the heat dissipation battery structure further includes a pressure relief valve 6 provided on the top wall 105 of the battery body 1011. When a heat conducting plate 2 is provided outside the top wall 105, through holes adapted to the positive and negative electrode tabs 5 and the pressure relief valve 6 can be processed on the heat conducting plate 2 to avoid interference with the electrode tabs and the pressure relief valve 6. In this embodiment, providing a heat conducting plate 2 on the top wall 105 where the positive and negative electrode tabs 5 are provided can effectively reduce the temperature of these highest temperature regions of the lithium battery, especially high heat generation regions such as the electrode tabs.

[0057] On the other hand, an embodiment of the present utility model further provides a battery module, including a plurality of the above-mentioned heat dissipation battery structures, and the plurality of heat dissipation battery structures are arranged in sequence in the same direction.

[0058] In summary, in view of the problems of large heat generation and difficult heat dissipation of current lithium batteries in various extreme working condition environments, the heat dissipation battery structure and battery module provided by the present utility model can effectively improve the temperature equalization ability of the battery. While achieving the overall temperature consistency of the lithium battery, it effectively reduces the highest temperature of the lithium battery, especially the temperature of high-heat generation areas such as the tab.

[0059] In addition, the application of the heat conduction plate 2 as a heat pipe can effectively reduce the impact of the heat dissipation design on the energy density of the lithium battery;

[0060] Moreover, the present utility model adopts the design of arranging the ultra-thin heat pipe between the blue film and the aluminum shell of the lithium battery with a copper-based water-cooled heat pipe, which can use the blue film to wrap the lithium battery and the heat pipe as a whole, improving the convenience of the overall structure and reducing the assembly difficulty and process cost of the phase change heat pipe.

[0061] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A heat dissipation battery structure, characterized in that, It includes a battery body and a heat conducting plate. The heat conducting plate is arranged outside at least one side shell of the battery body. At least part of the shell of the battery body is in heat conducting contact with the shell of the battery body. The heat conducting plate is wrapped and fixed outside the battery body through a first insulating film to form the heat dissipation battery structure.

2. The heat dissipation battery structure according to claim 1, wherein The heat conducting plate includes a first side surface and a second side surface arranged opposite to each other. A second insulating film is attached to the first side surface. The second insulating film fits the outer shell of the battery body and is in heat conducting contact.

3. The heat dissipation battery structure according to claim 1, wherein The first insulating film is a blue film.

4. The heat dissipation battery structure according to claim 1, wherein The heat conducting plate is a vapor chamber.

5. The heat dissipation battery structure according to claim 4, wherein The vapor chamber includes a copper-based water vapor chamber, an aluminum vapor chamber, and a stainless steel vapor chamber.

6. The heat dissipation battery structure according to claim 1, wherein The battery body includes a first side wall and a second side wall arranged opposite to each other, and a third side wall and a fourth side wall arranged opposite to each other. It also includes a top wall and a bottom wall arranged opposite to each other to enclose the battery body. The area of the first side wall is larger than that of the third side wall. The heat conducting plate is wrapped and fixed on the first side wall through the first insulating film.

7. The heat dissipation battery structure according to claim 6, wherein The heat conducting plate is also arranged on the second side wall. The heat conducting plates on the first side wall and the second side wall are wound and wrapped by the first insulating film and fixed outside the battery body.

8. The heat dissipation battery structure according to claim 6 or 7, characterized in that, The heat conducting plate is also arranged on the top wall and / or the bottom wall. The heat conducting plates on the top wall and / or the bottom wall are wound and wrapped by the first insulating film and fixed outside the battery body.

9. The heat dissipation battery structure according to claim 8, wherein, The heat conducting plates on each wall outside the battery body are an integral structure wrapped outside the battery body and in heat conducting contact with the battery body.

10. The heat dissipation battery structure according to claim 1, wherein The side wall of the battery body provided with the heat conducting plate can be fully covered by the heat conducting plate.

Images