Tubular cooling type cylindrical battery and battery pack with same

Abstract

The utility model discloses a tubular cooling type cylindrical battery and a battery pack with the same, and relates to the technical field of batteries, the tubular cooling type cylindrical battery comprises a cylindrical shell, and a cylindrical battery core is arranged in the cylindrical shell; a positive electrode end and a negative electrode end are arranged on the cylindrical shell, and through holes are formed in the positive electrode end and the negative electrode end; a cooling pipe is arranged in the cylindrical shell and penetrates through the center position of the cylindrical battery cell, and the two ends of the cooling pipe are communicated with the through hole of the positive electrode end and the through hole of the negative electrode end respectively; by adopting the design that the cooling pipe penetrates through the central position of the cylindrical battery cell, when a single battery works, heat generated in the cylindrical battery cell can be specifically and efficiently discharged through circulation of cooling liquid in the cooling pipe, and when a battery pack needs to be spliced for working, the positive and negative ends of adjacent batteries are butted, so that the battery pack can be conveniently assembled. And then the cooling pipes are connected in a penetrating manner to form a communicated cooling channel aiming at the battery pack, so that the cylindrical battery core and even the battery pack can work more safely and efficiently.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a tubular cooling cylindrical battery and a battery pack having the same. Background Art

[0002] Batteries play a significant role in our daily life and work. Due to impedance, batteries will generate heat during use. Exceeding the normal use temperature of the battery will cause battery capacity decay and battery short circuit risk. Especially in recent years, with the rapid development of electric vehicles and energy storage power stations, ensuring battery performance and safety is an important task for battery products. The heat generated during battery charging or discharging is mainly concentrated inside the battery. The current cooling method for cylindrical batteries and square batteries now mainly adopts the outer wall cooling method, combined with the air cooling method, to achieve the battery cooling effect. However, this cooling method is a cooling method for the battery from the outside to the inside, and it takes a while for the internal heat of the battery to cool down. When the battery is under continuous high-power conditions, the internal heat generation rate of the battery exceeds the heat dissipation rate, which will cause the battery material performance to decay and increase the safety hazard of battery short circuit. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a tubular cooling cylindrical battery and a battery pack having the same.

[0004] The utility model solves the technical problem by adopting the following technical solution: providing a tubular cooling cylindrical battery, comprising a cylindrical shell, in which a cylindrical battery cell is arranged; a positive terminal and a negative terminal are arranged on the cylindrical shell, the positive terminal and the negative terminal are electrically connected to the cylindrical battery cell, and through holes are arranged on the positive terminal and the negative terminal; a cooling tube is arranged in the cylindrical shell, the cooling tube passes through the center position of the cylindrical battery cell, and both ends of the cooling tube are respectively connected to the through hole of the positive terminal and the through hole of the negative terminal.

[0005] According to the tubular-cooled cylindrical battery provided by the utility model, by adopting a design in which a cooling tube is passed through the center of the cylindrical battery cell, at least the following technical effects are achieved: when a single battery is working, the heat generated inside the cylindrical battery cell can be discharged in a targeted and efficient manner by circulating the coolant in the cooling tube, and when it is necessary to splice the batteries into a battery pack for operation, the positive and negative ends of adjacent batteries are butt-jointed, and then connected through the cooling tube to form a cooling channel connected to the battery pack, thereby ensuring that the cylindrical battery cell and even the battery pack can work more safely and efficiently.

[0006] As some preferred embodiments of the utility model, the positive terminal is a hollow externally threaded cylindrical structure, the negative terminal is an internally threaded hole structure, and adjacent positive terminals and negative terminals can be threadedly connected.

[0007] As some preferred embodiments of the present utility model, the positive terminal is connected to the cylindrical shell via an insulating connecting ring.

[0008] As some preferred embodiments of the utility model, a positive terminal support ring is provided on the outer edge of the positive terminal, the positive terminal support ring is connected to the insulating connecting ring, and the positive terminal support ring is connected to the cylindrical battery cell through a positive electrode ear.

[0009] As some preferred embodiments of the present invention, the positive terminal is connected to the cooling tube via a connecting tube, and the connecting tube is located inside the cylindrical shell.

[0010] As some preferred embodiments of the present invention, a sealing ring is provided between the connecting pipe and the cooling pipe.

[0011] As some preferred embodiments of the utility model, a cooling tube sleeve is sleeved on the cooling tube, and the cooling tube sleeve is located between the cooling tube and the cylindrical battery core.

[0012] As some preferred embodiments of the present utility model, the cylindrical battery core is a hollow structure formed by winding, and the cooling tube is inserted into the hollow structure of the cylindrical battery core.

[0013] A battery pack according to an embodiment of the second aspect of the utility model comprises the above-mentioned tubular-cooled cylindrical batteries, wherein the tubular-cooled cylindrical batteries are connected in series, and insulating pads are arranged between adjacent cylindrical shells.

[0014] A battery pack according to an embodiment of the third aspect of the utility model includes the above-mentioned tubular-cooled cylindrical batteries, wherein the tubular-cooled cylindrical batteries are connected in parallel, and adjacent positive terminals and adjacent negative terminals are electrically connected via electrical connection sheets.

[0015] The beneficial effects of the utility model are:

[0016] 1. When the battery works as a single battery, the coolant flows through the cooling pipe, which can discharge the heat generated inside the cylindrical battery cell in a targeted and efficient manner, ensuring that the cylindrical battery cell of the battery can work more safely and efficiently;

[0017] 2. When the battery needs to be assembled into a battery pack, the positive and negative ends of adjacent batteries are connected, and then connected through cooling pipes to form a cooling channel for the battery pack, ensuring that the cylindrical battery cells and even the battery pack can work more safely and efficiently;

[0018] 3. The hollow external threaded cylindrical structure of the positive terminal is combined with the internal threaded hole structure of the negative terminal, which facilitates the connection of the positive and negative electrodes of the battery through threaded connection, eliminates the original battery connector, facilitates the installation and disassembly of the battery pack, and has good application value;

[0019] 4. The new design is especially suitable for the shape of cylindrical batteries and has the characteristics of high charge and discharge performance and high capacity.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 It is a three-dimensional diagram of the tubular cooling cylindrical battery of the utility model;

[0023] Figure 2 It is a three-dimensional cross-sectional view of the tubular cooling cylindrical battery of the utility model;

[0024] Figure 3 This is a structural exploded view of the tubular cooling cylindrical battery of the utility model;

[0025] Figure 4 It is a three-dimensional cross-sectional view of the cylindrical shell in the utility model;

[0026] Figure 5 It is a three-dimensional cross-sectional view of the positive electrode cover plate in the utility model;

[0027] Figure 6 It is an assembly diagram of the utility model;

[0028] Figure 7 It is a schematic diagram of the series-parallel state of the battery pack of the utility model.

[0029] Reference numerals:

[0030] Cylindrical shell 100, positive electrode cover plate 110, positive terminal 111, positive terminal support ring 112, insulating connecting ring 113, connecting pipe 114, injection hole 115, middle cylindrical shell 120, explosion-proof valve 121, lower negative electrode cover plate 130, negative terminal 131; cylindrical battery cell 200, positive electrode ear 210, negative electrode ear 220; cooling tube 300, cooling tube sleeve 310; sealing ring 400; insulating pad 500; connecting plate 600. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0032] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] In the description of the present utility model, the meaning of "a plurality" is more than two, and "greater than", "less than", "exceed" etc. are understood to exclude the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0034] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0035] Figure 1 It is a three-dimensional diagram of an embodiment of the utility model, referring to Figure 1 One embodiment of the utility model provides a tubular cooled cylindrical battery, which can be used as a power source in different types of power sources, devices and even large equipment.

[0036] Further, see Figure 2 The tubular cooling cylindrical battery of the utility model includes a cylindrical shell 100, which serves as the main structure of the battery. A cylindrical battery cell 200 is arranged in the cylindrical shell 100, and the cylindrical battery cell 200 serves as the battery storage part. The structure and working principle of the cylindrical battery cell 200 can refer to the cylindrical battery of the prior art, and will not be repeated here.

[0037] Furthermore, the cylindrical shell 100 is provided with a positive terminal 111 and a negative terminal 131, which are electrically connected to the cylindrical battery cell 200, and the positive terminal 111 and the negative terminal 131 serve as the positive and negative electrical terminals of the tubular cooling cylindrical battery of the utility model. Both the positive terminal 111 and the negative terminal 131 are provided with through holes.

[0038] Further, refer to Figure 2 , Figure 3A cooling tube 300 is provided in the cylindrical shell 100, and a coolant or other cooling fluid is built in the cooling tube 300. The cooling tube 300 passes through the center of the cylindrical battery cell 200, so that the cylindrical battery cell 200 can be cooled. The two ends of the cooling tube 300 are respectively connected to the through hole of the positive terminal 111 and the through hole of the negative terminal 131, that is, the coolant can enter the cooling tube 300 from the through hole of the positive terminal 111 or the through hole of the negative terminal 131 outside.

[0039] In actual work, refer to Figure 1 The tubular cooling cylindrical battery of the utility model can be powered on by connecting the positive terminal 111 and the negative terminal 131 according to the positive and negative poles to realize power supply or power storage.

[0040] When the tubular cooling cylindrical battery of the utility model works as a single battery, refer to Figure 1 , it is only necessary to connect the positive and negative poles through the positive terminal 111 and the negative terminal 131, and the through-hole positions of the positive terminal 111 and the negative terminal 131 are externally connected to a cooling device. By circulating the coolant in the cooling pipe 300, the heat generated inside the cylindrical battery cell 200 can be discharged in a targeted and efficient manner.

[0041] When the tubular cooling cylindrical battery of the utility model is connected as a battery pack, refer to Figure 6 , butt the positive terminals 111 and negative terminals 131 of two adjacent tubular cooling cylindrical batteries of the present invention, which is equivalent to connecting the two tubular cooling cylindrical batteries of the present invention in series. Then, the cooling tube 300 is connected to form a cooling channel for the battery pack. Figure 7 In this way, a number of tubular cooling cylindrical batteries of the utility model can be combined into a battery pack, and the cooling channels are connected into a complete channel external cooling device to form a circulating cooling effect, ensuring that the cylindrical battery cell 200 and even the battery pack can work more safely and efficiently.

[0042] Some embodiments, see Figure 2 The cylindrical battery cell 200 is a hollow structure formed by winding.

[0043] In this embodiment, optionally, the cylindrical battery cell 200 is a hollow winding structure with a hollow diameter of 41 mm, an outer diameter of 145 mm, and a height of 150 mm.

[0044] In some embodiments, the positive electrode material of the cylindrical battery cell 200 is a high-nickel ternary 9 series, the negative electrode is a silicon-carbon negative electrode, and the battery cell is a rate-type cell that can be charged at 5C and discharged at 20C.

[0045] In some embodiments, the positive electrode material of the cylindrical battery cell 200 is a high-rate lithium iron phosphate positive electrode material, and the negative electrode is a high-rate graphite negative electrode.

[0046] Some embodiments, see Figure 2 , Figure 3 The cylindrical battery cell 200 is electrically connected to the positive terminal 111 and the negative terminal 131 on the cylindrical shell 100 through the positive electrode ear 210 and the negative electrode ear 220. The positive electrode ear 210 and the negative electrode ear 220 on the cylindrical battery cell 200 can be located on the same side or on both sides.

[0047] In this embodiment, optionally, the positive electrode ear 210 is an aluminum electrode ear with a thickness of 0.1 mm, a length of 15 mm, and a width of 5 mm, and the negative electrode ear 220 is a nickel electrode ear with a thickness of 0.1 mm, a length of 15 mm, and a width of 5 mm.

[0048] In some embodiments, the positive terminal 111 is a hollow external threaded cylindrical structure, and the negative terminal 131 is an internal threaded hole structure, and adjacent positive terminals 111 and negative terminals 131 can be threadedly connected. For example, the positive terminal 111 of the first tubular cooling cylindrical battery of the present invention is threadedly connected to the negative terminal 131 of the second tubular cooling cylindrical battery of the present invention. In this way, the batteries can be connected together very conveniently.

[0049] In this embodiment, the positive terminal 111 is optionally a hollow external threaded cylindrical structure with an outer diameter of 50 mm, a hollow inner diameter of 40 mm, and a height of 20 mm. The negative terminal 131 is an internal threaded hole structure with an outer diameter of 50 mm, a hollow inner diameter of 40 mm, and a height of 20 mm.

[0050] In some embodiments, the positive terminal 111 is connected to the cylindrical shell 100 via an insulating connecting ring 113 so that when the positive terminal 111 is energized, the entire cylindrical shell 100 will not be energized, thereby ensuring safety.

[0051] In some embodiments, a positive terminal support ring 112 is disposed on the outer edge of the positive terminal 111, the positive terminal support ring 112 is connected to the insulating connection ring 113, and the positive terminal support ring 112 is connected to the cylindrical battery cell 200 through the positive ear 210. The positive terminal support ring 112 not only serves to fix the positive terminal 111, but also serves as a connection end of the positive ear 210 of the positive terminal 111, facilitating the electrical connection of the positive terminal 111.

[0052] Some embodiments, see Figure 2 , Figure 5 The positive terminal 111 is connected to the cooling tube 300 via a connecting tube 114 , and the connecting tube 114 is located inside the cylindrical shell 100 , so as to facilitate the connection between the through hole position of the positive terminal 111 and the cooling tube 300 .

[0053] In this embodiment, optionally, the connecting pipe 114 is made of stainless steel with an inner diameter of 30 mm and an outer diameter of 40 mm.

[0054] In this embodiment, optionally, a sealing ring 400 is provided between the connecting tube 114 and the cooling tube 300 to prevent the coolant from leaking from the docking position between the connecting tube 114 and the cooling tube 300 and affecting the safety of the cylindrical battery cell 200 .

[0055] In this embodiment, optionally, the sealing ring 400 is a polypropylene ring with an outer diameter of 40 mm, an inner diameter of 30 mm, and a thickness of 5 mm.

[0056] Some embodiments, see Figure 2 , Figure 4 The outer diameter of the cooling tube 300 is 40 mm and the inner diameter is 30 mm.

[0057] In some embodiments, the coolant in the cooling tube 300 is water.

[0058] In some embodiments, a cooling tube sleeve 310 is mounted on the cooling tube 300 , and the cooling tube sleeve 310 is located between the cooling tube 300 and the cylindrical battery cell 200 , so that the cooling tube 300 does not directly contact the cylindrical battery cell 200 , thereby ensuring the safety of the cylindrical battery cell 200 .

[0059] In this embodiment, optionally, the diameter of the hollow position of the cylindrical battery core 200 is the same as the outer diameter of the cooling sleeve 310 .

[0060] Some embodiments, see Figure 1 An explosion-proof valve 121 is provided on the cylindrical shell 100. When the internal pressure of the cylindrical shell 100 is too high, the explosion-proof valve 121 will be broken by the high pressure to achieve pressure relief and ensure safety.

[0061] In this embodiment, optionally, the explosion-proof valve 121 is a notched aluminum sheet.

[0062] In this embodiment, optionally, the explosion-proof valve 121 is a scored aluminum sheet with a thickness of 0.07 mm. When the internal pressure of the battery is greater than a predetermined pressure (eg, 0.7 MPa), the explosion-proof valve 121 ruptures.

[0063] Some embodiments, see Figure 1 , Figure 5 The cylindrical shell 100 is provided with a liquid injection hole 115 for injecting electrolyte. When manufacturing the battery, the electrolyte is added into the battery through the liquid injection hole 115, and then the liquid injection hole 115 is sealed.

[0064] In this embodiment, optionally, the injection hole 115 is a hole with a diameter of 3 mm.

[0065] In this embodiment, optionally, laser welding is used for sealing after the liquid injection is completed.

[0066] In some embodiments, the cylindrical shell 100 includes an upper positive electrode cover plate 110 , a middle cylindrical shell 120 , and a lower negative electrode cover plate 130 , which facilitates assembly and connection of the cylindrical shell 100 .

[0067] In this embodiment, optionally, the positive electrode cover plate 110 compacts the connecting tube 114, the sealing ring 400 and the upper end of the cooling sleeve 310 inside the cylindrical shell 100 by 25 MPa, and then the positive electrode cover plate 110 and the cylindrical shell 100 are sealed by laser to complete the sealing connection between the connecting tube 114, the sealing ring 400 and the cooling sleeve 310 inside the cylindrical shell 100.

[0068] In this embodiment, optionally, the cylindrical shell 100 is made of 3003H13 aluminum alloy with a thickness of 1.5 mm, an inner diameter of 120 mm, and a height of 180 mm.

[0069] In this embodiment, optionally, the positive electrode cover plate 110 is made of 3 mm aluminum alloy.

[0070] Some embodiments, see Figure 6 When a number of tubular cooling cylindrical batteries of the present invention are connected in series, insulating pads 500 are provided between adjacent cylindrical shells 100 to prevent the cylindrical shells 100 from being charged and causing a short circuit in the entire battery pack.

[0071] Some embodiments, see Figure 7 When a plurality of tubular cooling cylindrical batteries of the present invention are connected in parallel, adjacent positive terminals 111 and adjacent negative terminals 131 are electrically connected via the electrical connection sheet 600 .

[0072] Some embodiments, see Figure 7 , install the positive terminal 111 of the positive cover plate 110 in the negative terminal 131 at the bottom of the cylindrical shell 100 to connect 5 batteries in series, and then use a connecting strip to connect two groups of batteries in parallel to assemble a 2P2S battery pack, and pass the cooling pipe 300 through the hollow inner diameter of the positive terminal 111 and the connecting pipe 114 in the cylindrical shell 100, and connect the cooling water in the cooling pipe 300. When the battery pack is under high-current 15C discharge conditions, the heat generated inside the cylindrical battery cell 200 can be quickly transferred through the hollow inner diameter of the positive terminal 111, the connecting pipe 114 in the cylindrical shell 100, and the cooling device of the cooling pipe 300, ensuring that the positive terminal 111 and the cylindrical battery cell 200 work at normal temperatures, preventing the positive terminal 111 and the cylindrical battery cell 200 from generating heat under high-current conditions to damage the battery, thereby improving battery safety and efficiency.

[0073] In the description of this specification, the description with reference to the terms "some embodiments" or "it is conceivable that" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0074] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A tubular cooling cylindrical battery, Features: It comprises a cylindrical shell (100), wherein a cylindrical battery core (200) is arranged in the cylindrical shell (100); The cylindrical shell (100) is provided with a positive terminal (111) and a negative terminal (131), the positive terminal (111) and the negative terminal (131) are electrically connected to the cylindrical battery core (200), and the positive terminal (111) and the negative terminal (131) are both provided with through holes; A cooling pipe (300) is arranged in the cylindrical shell (100), the cooling pipe (300) passes through the center of the cylindrical battery core (200), and two ends of the cooling pipe (300) are respectively connected to the through hole of the positive terminal (111) and the through hole of the negative terminal (131).

2. A tubular cooling cylindrical battery according to claim 1, Features: The positive terminal (111) is a hollow externally threaded cylindrical structure, and the negative terminal (131) is an internally threaded hole structure; adjacent positive terminals (111) and negative terminals (131) can be threadedly connected.

3. A tubular cooling cylindrical battery according to claim 1, Features: The positive terminal (111) and the cylindrical shell (100) are connected via an insulating connection ring (113).

4. A tubular cooling cylindrical battery according to claim 3, Features: A positive terminal support ring (112) is provided on the outer edge of the positive terminal (111); the positive terminal support ring (112) is connected to the insulating connection ring (113); and the positive terminal support ring (112) is connected to the cylindrical battery cell (200) via a positive electrode ear (210).

5. A tubular cooling cylindrical battery according to claim 1, Features: The positive terminal (111) and the cooling pipe (300) are connected via a connecting pipe (114), and the connecting pipe (114) is located inside the cylindrical shell (100).

6. A tubular cooling cylindrical battery according to claim 5, Features: A sealing ring (400) is provided between the connecting pipe (114) and the cooling pipe (300).

7. A tubular cooling cylindrical battery according to claim 1, Features: A cooling tube sleeve (310) is sleeved on the cooling tube (300), and the cooling tube sleeve (310) is located between the cooling tube (300) and the cylindrical battery core (200).

8. A tubular cooling cylindrical battery according to claim 1, Features: The cylindrical battery core (200) is a hollow structure formed by winding, and the cooling tube (300) is inserted into the hollow structure of the cylindrical battery core (200).

9. A battery pack, It is characterized in that It comprises a tubular cooling type cylindrical battery according to any one of claims 1 to 8, wherein the tubular cooling type cylindrical batteries are connected in series, and an insulating pad (500) is arranged between adjacent cylindrical shells (100).

10. A battery pack, It is characterized in that It comprises a tubular cooling type cylindrical battery according to any one of claims 1 to 8, wherein the tubular cooling type cylindrical batteries are connected in parallel, and adjacent positive terminals (111) and adjacent negative terminals (131) are electrically connected via a contact sheet (600).

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