Sodium ion battery and heat conduction assembly thereof

Abstract

The utility model provides a sodium ion battery and a heat conduction assembly thereof. The sodium ion battery comprises a shell, the roll core is arranged on the shell, the roll core comprises a positive plate, a negative plate and a diaphragm arranged between the positive plate and the negative plate, the positive plate is provided with a positive tab, and the negative plate is provided with a negative tab; the heat conduction assembly comprises a first heat conduction part, a second heat conduction part and a transition heat conduction part, the first heat conduction part is connected with the positive plate and / or the negative plate, the second heat conduction part is connected with the negative tab, and the transition heat conduction part is arranged between the first heat conduction part and the second heat conduction part to connect the first heat conduction part and the second heat conduction part. According to the sodium ion battery disclosed by the utility model, heat in the battery cell of the sodium ion battery can be quickly released, so that heat accumulation and heat spreading in the battery are inhibited, and the safety of the battery cell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and more specifically, to a sodium ion battery and a heat conducting component thereof. Background Art

[0002] At present, the positive and negative current collectors of sodium-ion batteries are usually aluminum foil, which has poor thermal conductivity. Especially under extreme abuse conditions (thermal runaway, overcharging, high-temperature hot box overheating, high-rate discharge, etc.), the internal heat of the battery cell is transferred to the top pole through the pole collector pole tab in the direction of the tab extension to dissipate heat, while the heat transfer in the direction perpendicular to the large surface of the tab (that is, the thickness direction of the core) relies on the core to dissipate heat to the external aluminum shell in the form of thermal radiation. The heat transfer efficiency relying on the external aluminum shell is too slow, which can easily lead to heat accumulation inside the sodium-ion battery, thereby exacerbating the risk of thermal runaway. Utility Model Content

[0003] The utility model provides a new technical solution for sodium ion batteries, which can at least solve the problem of poor heat dissipation efficiency of sodium ion batteries in the prior art.

[0004] The utility model also provides a heat conducting component for the sodium ion battery.

[0005] According to the sodium ion battery of the embodiment of the first aspect of the present invention, it includes: a shell; a winding core, the winding core is arranged in the shell, the winding core includes a positive electrode sheet, a negative electrode sheet and a separator arranged between the positive electrode sheet and the negative electrode sheet, the positive electrode sheet is provided with a positive electrode tab, and the negative electrode sheet is provided with a negative electrode tab; a heat-conducting component, the heat-conducting component includes a first heat-conducting member, a second heat-conducting member and a transition heat-conducting member, the first heat-conducting member is connected to the positive electrode sheet and / or the negative electrode sheet, the second heat-conducting member is connected to the negative electrode tab, and the transition heat-conducting member is arranged between the first heat-conducting member and the second heat-conducting member to connect the first heat-conducting member and the second heat-conducting member.

[0006] Optionally, the shape of the first heat conductor is the same as that of the positive electrode sheet or the negative electrode sheet.

[0007] Optionally, the first heat conductor is wound and fixed in the winding core by the diaphragm, and an insulating film is provided between the outer surface of the winding core and the inner wall surface of the shell.

[0008] Optionally, the first heat-conducting member is attached to the outer surface of the winding core, and an insulating film is provided between the outer surface of the first heat-conducting member and the inner wall surface of the outer shell.

[0009] Optionally, the first heat conducting member is copper foil, and the thickness of the copper foil is 0.05 mm-0.5 mm.

[0010] Optionally, the second heat conducting member is aluminum foil, and the thickness of the aluminum foil is 0.05 mm-0.5 mm.

[0011] Optionally, the transition heat conducting member is a copper-aluminum composite member having a copper material portion and an aluminum material portion, the copper material portion is connected to the first heat conducting member, and the aluminum material portion is connected to the second heat conducting member.

[0012] Optionally, the heat conducting component is provided on one side of the winding core.

[0013] Optionally, the heat conducting components are respectively provided on both sides of the winding core.

[0014] According to the second aspect of the present utility model, the heat conductive component of the sodium ion battery includes a first heat conductive member, a second heat conductive member and a transition heat conductive member, wherein the first heat conductive member is connected to the positive electrode sheet and / or the negative electrode sheet of the sodium ion battery, the second heat conductive member is connected to the negative electrode tab of the sodium ion battery, and the transition heat conductive member is arranged between the first heat conductive member and the second heat conductive member to connect the first heat conductive member and the second heat conductive member.

[0015] According to the sodium ion battery of the present invention, by providing a heat conducting component, the first heat conducting member of the heat conducting component can be connected to the positive electrode sheet or the negative electrode sheet to quickly absorb the heat generated by the positive electrode sheet or the negative electrode sheet. The transition heat conducting member can transfer the heat absorbed by the first heat conducting member to the second heat conducting member, and then conduct the heat out through the negative electrode tab, thereby realizing the rapid release of heat inside the sodium ion battery cell, thereby suppressing heat accumulation and heat spread inside the battery and improving the safety of the battery cell.

[0016] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0018] Figure 1 1 is a schematic structural diagram of a sodium ion battery according to an embodiment of the present invention;

[0019] Figure 2 is a schematic structural diagram of a sodium ion battery according to another embodiment of the present invention;

[0020] Figure 3 1 is a schematic structural diagram of a sodium ion battery core according to an embodiment of the present invention;

[0021] Figure 41 is a schematic structural diagram of a heat-conducting component of a sodium ion battery according to an embodiment of the present invention;

[0022] Figure 5 The figure is a side view of a heat-conducting component of a sodium-ion battery according to one embodiment of the present invention.

[0023] Reference numerals:

[0024] Sodium ion battery 100;

[0025] Housing 10;

[0026] Winding core 20; negative electrode tab 21;

[0027] Heat conducting assembly 30; first heat conducting member 31; second heat conducting member 32; transition heat conducting member 33;

[0028] Insulating film 40 . DETAILED DESCRIPTION

[0029] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0030] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.

[0031] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0032] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0033] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0034] The sodium ion battery 100 according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0035] like Figures 1 to 5 As shown, the sodium ion battery 100 according to an embodiment of the present invention includes: a housing 10 , a winding core 20 and a heat conducting component 30 .

[0036] Specifically, the winding core 20 is arranged in the outer shell 10, and the winding core 20 includes a positive electrode sheet, a negative electrode sheet and a separator arranged between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet is provided with a positive electrode tab, and the negative electrode sheet is provided with a negative electrode tab 21. The heat conductive component 30 includes a first heat conductive member 31, a second heat conductive member 32 and a transition heat conductive member 33. The first heat conductive member 31 is connected to the positive electrode sheet and / or the negative electrode sheet, the second heat conductive member 32 is connected to the negative electrode tab 21, and the transition heat conductive member 33 is arranged between the first heat conductive member 31 and the second heat conductive member 32 to connect the first heat conductive member 31 and the second heat conductive member 32.

[0037] In other words, the sodium ion battery 100 according to an embodiment of the present invention can be mainly composed of an outer shell 10, a core 20 and a heat-conducting component 30, wherein the outer shell 10 can be an aluminum shell commonly used in sodium ion batteries in the field, and the shape of the outer shell 10 can be reasonably adjusted according to the actual use scenario of the sodium ion battery 100. A accommodating space is provided in the outer shell 10, and the core 20 is arranged in the accommodating space 10. The core 20 has a positive electrode sheet, a negative electrode sheet and a diaphragm. A diaphragm is provided between the positive electrode sheet and the negative electrode sheet and then wound to form a core, or stacked once to form a stacked core. This structure is understandable and easy to implement for those skilled in the art, so it will not be described in detail.

[0038] The heat conducting component 30 can be arranged between the shell 10 and the winding core 20, or it can be arranged inside the winding core 20. The heat conducting component 30 mainly consists of three parts: a first heat conducting member 31, a second heat conducting member 32, and a transition heat conducting member 33. Among them, the first heat conducting member 31 can be used to connect with the positive electrode sheet or the negative electrode sheet in the winding core 20, that is, the first heat conducting member 31 can be connected only to the positive electrode sheet, or only to the negative electrode sheet, or can be connected to both the positive electrode sheet and the negative electrode sheet at the same time. The first heat conducting member 31 is connected to the positive electrode sheet or the negative electrode sheet to quickly absorb the heat generated by the positive electrode sheet or the negative electrode sheet. The second heat conducting member 32 can be connected to the negative electrode tab 21 on the negative electrode sheet. The shape of the second heat conducting member 32 can correspond to the shape of the negative electrode tab 21. The negative electrode tab 21 is usually connected to the negative electrode post of the sodium ion battery, so that the second heat conducting member 32 can quickly dissipate heat through the negative electrode post. The transition heat conductor 33 is provided between the first heat conductor 31 and the second heat conductor 32. The transition heat conductor 33 can connect the first heat conductor 31 and the second heat conductor 32 while realizing rapid heat transfer between the first heat conductor 31 and the second heat conductor 32, so that the heat absorbed by the first heat conductor 31 can be quickly transferred to the second heat conductor 32, and then dissipated from the negative electrode of the sodium ion battery 100.

[0039] Therefore, according to the sodium ion battery 100 of the present invention, by providing a heat conducting assembly 30, the first heat conducting member 31 of the heat conducting assembly 30 can be connected to the positive electrode sheet or the negative electrode sheet to quickly absorb the heat generated by the positive electrode sheet or the negative electrode sheet. The transition heat conducting member 33 can transfer the heat absorbed by the first heat conducting member 31 to the second heat conducting member 32, and then conduct it through the negative electrode tab 21, thereby realizing the rapid release of heat inside the sodium ion battery cell, thereby suppressing heat accumulation and heat spread inside the battery, and improving the safety of the battery cell.

[0040] According to one embodiment of the present invention, the shape of the first heat conducting member 31 is the same as that of the positive electrode sheet or the negative electrode sheet.

[0041] That is to say, if Figure 3 and Figure 4 As shown, the core 20 can be roughly formed into a rectangular structure in the flat state. Correspondingly, the shape and size of the first heat conductor 31 are formed to correspond to the rectangular shape of the core 20 after being flattened. The structure of the first heat conductor 31 corresponds to the structure of the core 20, so that the first heat conductor 31 can quickly absorb the heat generated by the core 20, thereby further improving the heat dissipation effect.

[0042] In some specific embodiments of the present invention, the first heat conductor 31 is wound and fixed in the winding core 20 by a diaphragm, and an insulating film 40 is provided between the outer surface of the winding core 20 and the inner wall surface of the shell 10 .

[0043] Specifically, if Figure 1 As shown, in this embodiment, the first heat conductor 31 is wound and fixed in the core 20 by the diaphragm of the core 20. The first heat conductor 31 can be connected to the positive electrode sheet and is separated from the negative electrode sheet by a diaphragm. The insulating film 40 is wrapped on the outer surface of the core 20 to achieve insulation from the outer shell 10.

[0044] In some other specific embodiments of the present invention, the first heat conducting member 31 is attached to the outer surface of the winding core 20 , and an insulating film 40 is provided between the outer surface of the first heat conducting member 31 and the inner wall surface of the shell 10 .

[0045] Specifically, if Figure 2 As shown, in this embodiment, the first heat conductor 31 can be arranged on the outermost diaphragm of the core 20, and then the insulating film 40 is wrapped on the outer surface of the first heat conductor 31 to achieve insulation between the core 20 and the shell 10.

[0046] In other words, according to the embodiment of the present invention, the first heat conductor 31 can be arranged inside the winding core 20, or between the winding core 20 and the outer shell 10, as long as the first heat conductor 31 can be connected to the positive electrode sheet or the negative electrode sheet to quickly absorb the heat generated by the positive electrode sheet or the negative electrode sheet.

[0047] According to some embodiments of the present invention, the first heat conducting member 31 is a copper foil, and the thickness of the copper foil is 0.05 mm-0.5 mm.

[0048] Optionally, the second heat conducting member 32 is aluminum foil, and the thickness of the aluminum foil is 0.05 mm-0.5 mm.

[0049] In some specific embodiments of the present invention, the transition heat conductor 33 is a copper-aluminum composite member having a copper material portion and an aluminum material portion. The copper material portion is connected to the first heat conductor 31 , and the aluminum material portion is connected to the second heat conductor 32 .

[0050] That is to say, according to the embodiment of the present invention, the thermal conductive component 30 can be composed of copper foil, aluminum foil and copper-aluminum composite. The copper foil can be connected to the positive electrode sheet or the negative electrode sheet of the winding core 20. The thickness of the copper foil can be 0.05mm-0.5mm, preferably 0.1mm-0.2mm, so as to quickly absorb the heat generated by the positive electrode sheet or the negative electrode sheet.

[0051] The aluminum foil can be connected to the negative electrode of the sodium-ion battery 100. The thickness of the aluminum foil can be 0.05 mm to 0.5 mm, preferably 0.05 mm to 0.1 mm, thereby quickly releasing heat from the battery. The copper-aluminum composite can be formed by connecting a copper material portion and an aluminum material portion using ultrasonic welding, laser welding, thermal lamination, chemical electroplating, or other methods. The copper material portion is connected to the copper foil, and the aluminum material portion is connected to the aluminum foil. This can achieve rapid heat transfer between the copper foil and the aluminum foil, thereby effectively improving the heat dissipation efficiency of the thermal conductive component 30.

[0052] According to one embodiment of the present invention, a heat conducting component 30 is provided on one side of the winding core 20 .

[0053] Optionally, heat conducting components 30 are respectively provided on both sides of the winding core 20 .

[0054] That is to say, there can be one heat-conducting component 30, that is, the heat-conducting component 30 is arranged on one side of the core 20, or there can be two heat-conducting components 30, that is, heat-conducting components 30 can be provided on both sides of the core 20, and the first heat-conducting member 31 of each heat-conducting component 30 is connected to the positive electrode sheet or the negative electrode sheet, that is, the copper foil can be placed on the front and back sides of the core 20 by ultrasonic welding, and the second heat-conducting member 32 is connected to the negative electrode tab 21, that is, the top aluminum foil of the heat-conducting component 30 can be located on both sides of the negative electrode tab 21 of the roll 20, and the aluminum foils on the front and back sides are welded to the negative electrode tab 21 of the core 20 by ultrasonic welding. The transition heat-conducting member 33 connects the first heat-conducting member 31 and the second heat-conducting member 32 to realize heat transfer between the first heat-conducting member 31 and the second heat-conducting member 32, thereby ensuring rapid heat dissipation of the core 20 in the sodium ion battery 100.

[0055] According to an embodiment of the present invention, the heat conducting assembly 30 of the sodium ion battery includes a first heat conducting member 31, a second heat conducting member 32 and a transition heat conducting member 33. The first heat conducting member 31 is connected to the positive electrode sheet and / or the negative electrode sheet of the sodium ion battery, the second heat conducting member 32 is connected to the negative electrode tab 21 of the sodium ion battery, and the transition heat conducting member 33 is arranged between the first heat conducting member 31 and the second heat conducting member 32 to connect the first heat conducting member 31 and the second heat conducting member 32.

[0056] Since the specific structure of the heat conducting component 30 has been described in detail in the sodium ion battery 100 according to the above embodiment of the present invention, it will not be described in detail again.

[0057] Although some specific embodiments of the present invention have been described in detail through examples, those skilled in the art will appreciate that the above examples are for illustration only and are not intended to limit the scope of the present invention. Those skilled in the art will appreciate that modifications may be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A sodium ion battery, characterized in that include: shell; A winding core is provided in the housing, the winding core comprising a positive electrode sheet, a negative electrode sheet, and a separator provided between the positive electrode sheet and the negative electrode sheet, the positive electrode sheet is provided with a positive electrode tab, and the negative electrode sheet is provided with a negative electrode tab; A heat-conducting component, comprising a first heat-conducting member, a second heat-conducting member and a transition heat-conducting member, wherein the first heat-conducting member is connected to the positive electrode sheet and / or the negative electrode sheet, the second heat-conducting member is connected to the negative electrode tab, and the transition heat-conducting member is arranged between the first heat-conducting member and the second heat-conducting member to connect the first heat-conducting member and the second heat-conducting member.

2. The sodium ion battery according to claim 1, characterized in that The shape of the first heat conducting member is the same as that of the positive electrode sheet or the negative electrode sheet.

3. The sodium ion battery according to claim 1, characterized in that The first heat conductor is wound and fixed in the winding core by the diaphragm, and an insulating film is provided between the outer surface of the winding core and the inner wall surface of the shell.

4. The sodium ion battery according to claim 1, characterized in that The first heat conducting member is attached to the outer surface of the winding core, and an insulating film is provided between the outer surface of the first heat conducting member and the inner wall surface of the outer shell.

5. The sodium ion battery according to claim 1, characterized in that The first heat conducting member is copper foil, and the thickness of the copper foil is 0.05 mm-0.5 mm.

6. The sodium ion battery according to claim 5, characterized in that The second heat conducting member is aluminum foil, and the thickness of the aluminum foil is 0.05 mm-0.5 mm.

7. The sodium ion battery according to claim 6, characterized in that The transition heat conducting member is a copper-aluminum composite member having a copper material portion and an aluminum material portion. The copper material portion is connected to the first heat conducting member, and the aluminum material portion is connected to the second heat conducting member.

8. The sodium ion battery according to claim 1, characterized in that The heat conducting component is provided on one side of the winding core.

9. The sodium ion battery according to claim 1, characterized in that The heat conducting components are respectively provided on both sides of the winding core.

10. A thermally conductive component for a sodium ion battery, characterized in that: The invention comprises a first heat conducting member, a second heat conducting member and a transition heat conducting member, wherein the first heat conducting member is connected to the positive electrode sheet and / or the negative electrode sheet of the sodium ion battery, the second heat conducting member is connected to the negative electrode tab of the sodium ion battery, and the transition heat conducting member is arranged between the first heat conducting member and the second heat conducting member to connect the first heat conducting member and the second heat conducting member.

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