Stamping vapor chamber integrated battery shell, battery and manufacturing method of stamping vapor chamber integrated battery shell

Abstract

The invention discloses a stamping vapor chamber integrated battery shell, a battery and a manufacturing method of the stamping vapor chamber integrated battery shell, and belongs to the technical field of battery structures.The stamping vapor chamber integrated battery shell comprises a bottom plate, the upper side and the lower side of the bottom plate are each provided with a first area, and the outer side of each first area is sequentially provided with a silk screen, a liquid absorption core and a top plate; the bottom plate and the top plate are attached to form a closed cavity, a supporting structure is arranged on the surface of the top plate, the bottom of the supporting structure is attached to the silk screen, and the invention further discloses a stamping vapor chamber integrated battery and a manufacturing method thereof. By adopting the stamping vapor chamber integrated battery and the manufacturing method, the temperature consistency of the blade battery is improved, heat accumulation is avoided, the safety and the service life of the battery are ensured, and a guarantee is provided for further improving the charging speed.

Description

Technical Field

[0001] The present invention relates to the technical field of battery structures, and in particular to a stamped heat spreader integrated battery housing, a battery and a manufacturing method thereof. Background Art

[0002] At present, blade-shaped long batteries, such as blade batteries and short blade batteries, have further improved the energy density of lithium-ion batteries, and can also ensure the safety and cycle life of batteries, further improving the range of electric vehicles. However, in the prior art, the tabs of this long and narrow blade battery are distributed on both sides of the battery length. During the charge and discharge process, due to the large distance between the tabs, the current is easily unevenly distributed, resulting in the heat of the blade battery mainly concentrated near the tabs, causing the temperature to be "high at both ends and low in the middle". The surface distribution on the single battery is seriously inconsistent (the temperature difference is greater than 5°C), resulting in capacity imbalance in different areas of the battery, which will further lead to capacity loss and unstable power output, and accelerate battery aging.

[0003] In view of the special structure of blade batteries, the battery shell should be made of high thermal conductivity materials as much as possible. At present, blade batteries mainly use aluminum alloy materials as the outer shell to achieve the purpose of heat transfer. Although the current blade battery shell has a simple structure and is easy to process, the thermal conductivity of aluminum alloy is low, making it difficult to achieve efficient heat transfer and unable to quickly thermally regulate the surface temperature of the blade battery. When charging at a low rate, the temperature difference on the surface of the single cell is large (much greater than 5°C), which limits the charging speed of the battery.

[0004] Due to its high thermal conductivity, the vapor chamber is widely used in the field of microelectronic heat dissipation. The efficient pumping efficiency of its internal capillary structure and the huge latent heat of phase change of the working fluid make the vapor chamber have excellent heat transfer performance. Therefore, with the huge advantage of high thermal conductivity, the vapor chamber has great potential in the field of battery thermal management. In addition, the common vapor chamber shell molding mostly adopts wet etching process, which has high precision and high cost. The stamping shell process is low-cost and suitable for mass production. Therefore, the stamped vapor chamber shell is expected to be widely used in the battery field. Summary of the invention

[0005] The purpose of the present invention is to provide a stamped heat spreader integrated battery housing, a battery and a manufacturing method thereof, which can improve the temperature consistency of the blade battery, avoid heat accumulation, ensure the safety and life of the battery, and provide a guarantee for further improving the charging speed while ensuring that the cost is not increased as much as possible.

[0006] To achieve the above-mentioned purpose, the present invention provides a stamped heat spreader integrated battery enclosure, including a bottom plate, wherein area one is provided on the upper and lower sides of the bottom plate, and a wire mesh, a liquid wick and a top plate are sequentially provided on the outside of area one, and the bottom plate and the top plate are bonded to form a closed cavity, and a support structure is provided on the surface of the top plate, and the bottom of the support structure is bonded to the wire mesh.

[0007] Preferably, a coating alloy is provided on the outer side of the bottom plate, and the bottom plate material is one of stainless steel aluminum composite material, copper aluminum composite plate material, aluminum and its alloy, stainless steel or polymer material.

[0008] Preferably, the top plate is a stainless steel plate, an aluminum plate or a composite plate.

[0009] Preferably, the stamped heat spreader integrated battery housing is provided with a bending area.

[0010] Preferably, an insulating layer is provided on the outer side of the stamped heat spreader integrated battery housing.

[0011] Preferably, the support structure is one of a spherical, cylindrical and prismatic shape that is evenly distributed.

[0012] The present invention provides a stamped heat spreader integrated battery, comprising a stamped heat spreader integrated battery casing and a battery cell, wherein the battery cell is arranged inside the stamped heat spreader integrated battery casing, and insulating end covers and pole ears are arranged on both sides of the battery cell.

[0013] The present invention provides a method for manufacturing a stamped vapor chamber integrated battery, the steps comprising: S1. Manufacturing a stamped heat sink integrated battery housing; S2. Bend the integrated battery housing according to the crease of the stamped heat spreader and weld it at the interface; S3, placing the battery cell inside the bent stamped heat spreader integrated battery housing; S4. Weld the insulating end caps to both ends of the battery, and weld the tabs to both ends of the battery.

[0014] Preferably, the manufacturing of a stamped heat spreader integrated battery housing comprises: S11, stamping the top plate to form the supporting structure; S12, sintering the wire mesh on area 1 of the base plate; S13, sintering the liquid wick on the top plate; S14, attaching the top plate to the area of ​​the bottom plate to form a package; S15, passivating, filling, vacuuming, secondary degassing and resistance welding are performed on the packaged battery casing to obtain a stamped heat spreader integrated battery casing.

[0015] Preferably, the manufacturing of a stamped heat spreader integrated battery housing comprises: S11, stamping the top plate to form the supporting structure; S12, sintering the screen and the wick sequentially on area 1 of the bottom plate; S13, attaching the top plate to the area of ​​the bottom plate to form a package; S14, passivating, filling, vacuuming, secondary degassing and resistance welding are performed on the packaged battery casing to obtain a stamped heat spreader integrated battery casing.

[0016] Therefore, the present invention adopts the above-mentioned stamped heat sink integrated battery housing, battery and manufacturing method thereof, which has the following beneficial effects: (1) The structure and process are simple. The manufacturing process of the heat spreader is combined with the manufacturing process of the battery shell. It has little impact on the volume of the battery and almost no impact on the volume specific energy of the battery, greatly improving the heat transfer efficiency of the battery in the length direction. (2) Compared with traditional metal casing, it can meet the heat transfer requirements over long distances; (3) Compared with the traditional vapor chamber solution, the shell substrate is used as the vapor chamber bottom plate, which reduces the thickness and also reduces the thermal resistance, thus improving the heat transfer performance; (4) The temperature consistency of the blade battery is improved, heat accumulation is avoided, the safety and life of the battery are ensured, and a guarantee is provided for further improving the charging speed.

[0017] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of a stamped vapor chamber integrated battery structure according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a battery housing with an integrated stamped vapor chamber according to an embodiment of the present invention; Figure 3 This is a schematic cross-sectional view of a battery housing with a stamped vapor chamber integrated therein according to an embodiment of the present invention; Figure 4 It is a partial cross-sectional schematic diagram of a battery housing with a stamped vapor chamber integrated therein according to an embodiment of the present invention; Figure 5 This is a bending and welding diagram of a stamped heat spreader integrated battery housing according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the weld position of a battery housing with a stamped vapor chamber integrated therein according to an embodiment of the present invention; Figure 7 This is a bending diagram of a stamped heat spreader integrated battery housing according to an embodiment of the present invention; Figure 8This is a diagram of a battery square housing assembly with a stamped heat spreader integrated therein according to an embodiment of the present invention; Fig. 9 This is a diagram of an integrated battery housing with two stamped vapor chambers according to an embodiment of the present invention; Reference numerals 1. Tab; 2. Battery cell; 3. Insulating end cap; 4. Stamped heat spreader integrated battery housing; 41. Top plate; 42. Liquid wick; 43. Wire mesh; 44. Bottom plate; 45. Coating alloy; 46. Support structure. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] Example 1 The present invention provides a stamped heat spreader integrated battery, such as Figure 1 As shown, it includes a stamped heat spreader integrated battery casing 4 and a battery cell 2, the battery cell 2 is arranged inside the stamped heat spreader integrated battery casing 4, and insulating end covers 3 and pole ears 1 are arranged on both sides of the battery cell 2.

[0021] A stamped heat spreader integrated battery housing, such as Figure 2-Figure 4 As shown, 4 includes a bottom plate 44, and a coating alloy 45 is arranged on the outside of the bottom plate 44. The material of the bottom plate 44 is a stainless steel aluminum composite material, a copper-aluminum composite plate material, aluminum and its alloy, stainless steel, a polymer material or other composite materials. Areas 1 are arranged on both the upper and lower sides of the bottom plate 44, and a wire mesh 43, a liquid wick 42 and a top plate 41 are arranged on the outside of the area 1 in sequence. The top plate 41 is a stainless steel plate, an aluminum plate or a composite plate. The liquid wick 42 is a combination of materials with super hydrophilicity and high capillary force such as a wire mesh type and a braided belt type. The liquid wick can also be made by other mechanical processing methods, including but not limited to milling, rolling, plowing, stamping, 3D printing and other processes. The bottom plate 44 and the top plate 41 are bonded to form a closed cavity. A support structure 46 is arranged on the surface of the top plate 41, and the support structure 46 is bonded to the wire mesh 43. The support structure 46 is a uniformly distributed spherical, cylindrical and prismatic shape.

[0022] The stamped heat spreader integrated battery housing 4 is provided with a bending area, which can be bent through the crease. The stamped heat spreader integrated battery housing 4 is provided with an insulating layer on the outside, and the insulating layer material includes but is not limited to a polymer material film and a sprayable insulating material.

[0023] The present invention also provides a method for manufacturing a stamped vapor chamber integrated battery, the steps comprising: S1, manufacturing a stamped heat spreader integrated battery housing 4, specifically comprising: S11 , punching the top plate 41 to form the support structure 46 .

[0024] S12, sintering the wire mesh 43 on area 1 of the base plate 44.

[0025] S13, sintering the liquid wick 42 on the top plate 41.

[0026] S14, the top plate 41 and the bottom plate 44 are bonded together to form a package. The packaging forming method includes but is not limited to mechanical connection and metallurgical connection.

[0027] Area 1 can be the size of the entire composite stainless steel aluminum plate, and the stamped top plate is the same as the composite stainless steel aluminum plate. After packaging, the entire battery housing is a stamped heat spreader. Area 1 can also be a designated area on the bottom plate, and the size of the top plate is the same as the designated area.

[0028] S15, passivating, filling, vacuuming, secondary degassing and resistance welding the packaged stamped heat spreader integrated battery shell 4 to obtain a stamped heat spreader integrated battery shell. The filling medium includes but is not limited to deionized water, ethanol and propanol.

[0029] S2, such as Figure 5 As shown, the battery housing 4 is bent according to the crease of the stamping heat spreader and welded at the interface. The weld position is as shown in FIG. Figure 6 The welding methods include but are not limited to laser welding, stir friction welding and brazing, and the welding seam forms include but are not limited to butt welds, fillet welds and lap welds.

[0030] S3, placing the battery cell 2 inside the bent stamped heat spreader integrated battery housing 4.

[0031] After bending, a stamped heat spreader integrated battery housing 4 forms a square battery housing with one side open or a square battery housing with two sides open. Figure 7 The figure shows a schematic diagram of a square battery shell with one side open. The stamped heat spreader integrated battery can be combined with a square battery shell with one or two sides open according to the actual battery length. Figure 8 shown.

[0032] An integral battery housing can also be formed by two stamped heat-diffusion plate integrated battery housings 4, which are bent in the length direction and then welded twice to form a battery housing. Fig. 9 shown.

[0033] S4. Weld the insulating end caps to both ends of the battery, and weld the tabs to both ends of the battery to form the positive and negative tabs of the battery.

[0034] During the operation of the battery, the ion transfer inside the battery will generate chemical reaction heat, causing the temperature of the battery cell 2 to rise. Since the current density near the pole ear 1 is large, the temperature rise is more obvious, so a high temperature area appears at the pole ear end. At this time, the temperature in the middle of the battery is lower than the pole ear end. The heat inside the battery cell 2 is transferred to the stamped heat spreader integrated battery housing 4 through heat conduction. The working fluid liquid in the heat spreader cavities on both sides absorbs heat and evaporates, and the temperature at the pole ear end decreases; the steam quickly diffuses to the condensation end (the middle area of ​​the battery) under the action of the pressure difference, and the steam condenses into liquid and releases latent heat. After the heat is absorbed by the battery, the temperature in the middle of the battery increases, thereby improving the temperature consistency of the battery.

[0035] After the working fluid is condensed, it is pumped back to the heating end through the capillary action of the liquid wick 42 and the wire mesh 43 to replenish the working fluid, and this cycle repeats to achieve full-range temperature control of the battery. In addition, during the operation of the battery, the battery temperature is controlled with the help of external thermal management measures, which improves the consistency of the battery surface temperature and is expected to further increase the battery charging rate.

[0036] Example 2 The method for manufacturing a stamped heat spreader integrated battery housing in this embodiment is different from that in Embodiment 1. The method for manufacturing a stamped heat spreader integrated battery housing 4 includes: S11, stamping the top plate 41 to form the support structure 46; S12, sintering the screen 43 and the wick 42 sequentially on the area 1 of the bottom plate 41; S13, the top plate 41 and the bottom plate 44 are bonded together to form a package; S14, passivating, filling, vacuuming, secondary degassing and resistance welding are performed on the packaged battery casing to obtain a stamped heat spreader integrated battery casing.

[0037] Therefore, the present invention adopts the above-mentioned stamped heat spreader integrated battery housing, battery and manufacturing method thereof, which improves the temperature consistency of the blade battery, avoids heat accumulation, ensures the safety and life of the battery, and provides a guarantee for further improving the charging speed.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A stamped heat sink integrated battery housing, characterized in that: It includes a bottom plate, and area one is arranged on the upper and lower sides of the bottom plate. A wire mesh, a liquid wick and a top plate are arranged in sequence on the outside of the area one. The bottom plate and the top plate are bonded to form a closed cavity. A supporting structure is arranged on the surface of the top plate, and the bottom of the supporting structure is bonded to the wire mesh.

2. The stamped heat sink integrated battery housing according to claim 1, characterized in that: The outer side of the bottom plate is provided with a coating alloy, and the bottom plate material is one of stainless steel aluminum composite material, copper aluminum composite plate material, aluminum and its alloy, stainless steel or polymer material.

3. The stamped vapor chamber integrated battery housing according to claim 1, characterized in that: The top plate is a stainless steel plate, an aluminum plate or a composite plate.

4. The stamped vapor chamber integrated battery housing according to claim 1, characterized in that: The stamped heat spreader integrated battery housing is provided with a bending area.

5. The stamped vapor chamber integrated battery housing according to claim 1, characterized in that: An insulating layer is arranged on the outer side of the stamped heat spreader integrated battery housing.

6. The stamped vapor chamber integrated battery housing according to claim 1, characterized in that: The support structure is one of a spherical, cylindrical and prism shape that is evenly distributed.

7. A stamped heat sink integrated battery, characterized in that: It comprises a stamped heat spreader integrated battery casing and a battery cell as described in any one of claims 1 to 6, the battery cell is arranged inside the stamped heat spreader integrated battery casing, and insulating end covers and pole ears are arranged on both sides of the battery cell.

8. A method for manufacturing a stamped vapor chamber integrated battery, using the stamped vapor chamber integrated battery as claimed in claim 7, characterized in that the steps include: S1. Manufacturing a stamped heat sink integrated battery housing; S2. Bend the integrated battery housing according to the crease of the stamped heat spreader and weld it at the interface; S3, placing the battery cell inside the bent stamped heat spreader integrated battery housing; S4. Weld the insulating end caps to both ends of the battery, and weld the tabs to both ends of the battery.

9. The method for manufacturing a stamped vapor chamber integrated battery according to claim 8, characterized in that: The manufacturing of a stamped vapor chamber integrated battery housing comprises: S11, stamping the top plate to form the supporting structure; S12, sintering the wire mesh on area 1 of the base plate; S13, sintering the liquid wick on the top plate; S14, attaching the top plate to the area of ​​the bottom plate to form a package; S15, passivating, filling, vacuuming, secondary degassing and resistance welding are performed on the packaged battery casing to obtain a stamped heat spreader integrated battery casing.

10. The method for manufacturing a stamped vapor chamber integrated battery according to claim 8, characterized in that: The manufacturing of a stamped vapor chamber integrated battery housing comprises: S11, stamping the top plate to form the supporting structure; S12, sintering the screen and the wick sequentially on area 1 of the bottom plate; S13, attaching the top plate to the area of ​​the bottom plate to form a package; S14, passivating, filling, vacuuming, secondary degassing and resistance welding are performed on the packaged battery casing to obtain a stamped heat spreader integrated battery casing.

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