Battery cell and battery pack

Abstract

The present invention discloses a battery cell and a battery pack. The battery cell includes a cylinder. The two ends of the cylinder are respectively provided with a first end cover and a second end cover. The cylinder, the first end cover and the second end cover define a containing space. A battery cell assembly is provided in the containing space. A heat exchange tube is provided on the first end cover and the second end cover and passes through the containing space. The outer wall of the heat exchange tube is in contact with the battery cell assembly. The heat exchange tube is connected to an external low-temperature fluid and exchanges heat with the battery cell assembly to take away part of the heat generated by the battery cell assembly, thereby avoiding the situation where the internal temperature of the battery cell rises and the battery charging and discharging efficiency and reliability are reduced. The heat exchange tube is connected to an external warm fluid and exchanges heat with the battery cell assembly, which can help the battery cell assembly to quickly heat up under extremely cold conditions, thereby improving the efficiency of electric energy utilization. The battery pack includes at least two battery cells. The heat exchange tubes of adjacent battery cells are connected. After the external fluid is input from the heat exchange tube at one end of the battery pack, all battery cells can be heat exchanged.

Description

Technical Field

[0001] The invention relates to a battery cell and a battery pack. Background Art

[0002] At present, general batteries can only use the shell wrapped around the outside of the battery cell assembly for heat exchange, and the heat exchange effect is poor. When the internal temperature of the battery is too high, the heat accumulated in the battery will cause the battery charging and discharging efficiency and reliability to decrease. When in an extremely cold environment, the internal temperature of the battery is too low. Both situations will affect the efficiency and reliability of electric energy utilization. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a battery cell with good heat exchange.

[0004] The present invention also provides a battery pack, each battery cell of which can achieve a good heat exchange effect, thereby improving the energy utilization rate of the battery pack.

[0005] According to a first aspect of an embodiment of the present invention, a battery cell comprises: a cylinder, wherein a first end cover and a second end cover are respectively provided at both ends of the cylinder, wherein the cylinder, the first end cover and the second end cover define an accommodation space, wherein a battery cell assembly is provided in the accommodation space; a heat exchange tube, which is passed through the first end cover and the second end cover, wherein the heat exchange tube passes through the accommodation space, and wherein the outer wall of the heat exchange tube is in contact with the battery cell assembly.

[0006] A battery cell according to an embodiment of the present invention has at least the following beneficial effects:

[0007] The above battery cells are provided with heat exchange tubes running through the interior thereof, the tube walls of the heat exchange tubes are in contact with the battery cell assemblies, the heat exchange tubes are connected to external low-temperature fluids and exchange heat with the battery cell assemblies to take away part of the heat generated by the battery cell assemblies, thereby avoiding the situation where the internal temperature of the battery cells rises and the battery charging and discharging efficiency and reliability decrease. The heat exchange tubes are connected to external warm fluids and exchange heat with the battery cell assemblies, which can help the battery cell assemblies to heat up quickly under extremely cold conditions, thereby improving the energy utilization efficiency of the battery cells.

[0008] In some embodiments of the present invention, the heat exchange tube includes a central tube, a first joint and a second joint, the first end cover and the second end cover are respectively provided with a first mounting hole and a second mounting hole adapted to the central tube, the first joint is detachably connected to one end of the central tube and pressed onto the first end cover, the second joint is detachably connected to the other end of the central tube and pressed onto the second end cover, and the first joint and the second joint are respectively provided with a first through hole and a second through hole connected to the interior of the central tube.

[0009] In some embodiments of the present invention, two ends of the central tube are threadedly connected to the first joint and the second joint, respectively.

[0010] In some embodiments of the present invention, the battery cell further includes a first seal and a second seal, wherein the first seal is sealingly disposed between the first joint and the first end cover, and the second seal is sealingly disposed between the second joint and the second end cover.

[0011] In some embodiments of the present invention, the first end cover is provided with a connection kit for connecting to the second end cover of another battery cell.

[0012] In some embodiments of the present invention, the first end cover is provided with a first internal thread, the second end cover is provided with a second internal thread, the connecting kit is provided with a first external thread connected to the first internal thread, and the connecting kit is provided with a second external thread matching the second internal thread.

[0013] The present invention further provides a battery pack, comprising at least two battery cells according to any of the above technical solutions, wherein the battery cells are sequentially connected in series via a connection kit, and the heat exchange tubes on adjacent battery cells are interconnected.

[0014] The battery pack according to the embodiment of the present invention has at least the following beneficial effects:

[0015] The above battery pack includes at least two battery cells, which are connected in series in sequence through a connecting kit, and the heat exchange tubes on adjacent battery cells are interconnected. After external fluid is input from the heat exchange tube at one end of the battery pack, the fluid can be output from the heat exchange tube at the other end of the battery pack, thereby performing heat exchange on all battery cells in the battery pack.

[0016] In some embodiments of the present invention, adjacent battery cells and corresponding connection kits form a closed chamber, and the heat exchange tubes are all connected to the closed chamber.

[0017] In some embodiments of the present invention, a through hole for connecting the closed chamber with the outside is provided on the side wall of the connection kit, and a sealing plug for sealing the through hole is detachably installed on the through hole.

[0018] In some embodiments of the present invention, adjacent heat exchange tubes are connected via a third connector, and an inner hole channel communicating with the inner part of the adjacent heat exchange tubes is provided inside the third connector.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or 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:

[0021] Figure 1 A schematic diagram of the internal structure of a battery cell according to an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of the internal structure of a battery pack according to an embodiment of the present invention;

[0023] Figure 3 FIG. 4 is a schematic diagram of the internal structure of another embodiment of a battery pack of the present invention. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, examples of which 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.

[0025] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientations or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside” and “outside” 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 should not be understood as a limitation on the present invention.

[0026] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including 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.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] See also Figure 1 A battery cell according to a first aspect of an embodiment of the present invention comprises: a barrel 100, wherein a first end cover 200 and a second end cover 300 are respectively disposed at both ends of the barrel 100, wherein the barrel 100, the first end cover 200 and the second end cover 300 define an accommodation space, wherein a battery cell assembly 400 is disposed in the accommodation space; and a heat exchange tube 500 is passed through the first end cover 200 and the second end cover 300, wherein the heat exchange tube 500 passes through the accommodation space, and an outer wall of the heat exchange tube 500 contacts the battery cell assembly 400. The above battery cells are provided with heat exchange tubes 500 running through the interior thereof, the tube wall of the heat exchange tubes 500 being in contact with the battery cell assembly 400, the heat exchange tubes 500 being connected to external low-temperature fluid and exchanging heat with the battery cell assembly 400, which can take away part of the heat generated by the battery cell assembly 400, thereby avoiding the situation where the internal temperature of the battery cell rises and the battery charging and discharging efficiency and reliability decrease, and the heat exchange tubes 500 being connected to external warm fluid and exchanging heat with the battery cell assembly 400, can help the battery cell assembly 400 to quickly heat up under extremely cold conditions, thereby improving the efficiency of electric energy utilization.

[0029] See also Figure 1 In some embodiments of the present invention, the heat exchange tube 500 includes a central tube 510, a first joint 520 and a second joint 530, the first joint 520 and the second joint 530 are respectively provided with a first through hole 521 and a second through hole 531 connected to the interior of the central tube 510, the first through hole 521 and the second through hole 531 are respectively opposite to two ports of the central tube 510, the first end cover 200 and the second end cover 300 are respectively provided with a first mounting hole and a second mounting hole adapted to the central tube 510, the first mounting hole The mounting hole and the second mounting hole are respectively used for the two ends of the central tube 510 to pass through, the first joint 520 is detachably connected to one end of the central tube 510 and pressed onto the first end cover 200, and the second joint 530 is detachably connected to the other end of the central tube 510 and pressed onto the second end cover 300. The first joint 520 and the second joint 530 can not only fix the central tube 510 inside the battery cell, but also reinforce the connection between the first end cover 200 and the cylinder 100, and the connection between the second end cover 300 and the cylinder 100.

[0030] See also Figure 1 In some embodiments of the present invention, in order to simplify the installation method, both ends of the central tube 510 are threadedly connected to the first joint 520 and the second joint 530 respectively.

[0031] See also Figure 1In some embodiments of the present invention, for a battery cell having an electrolyte in the cylinder 100, in order to prevent leakage of the electrolyte, the battery cell further includes a first seal 540 and a second seal 550, wherein the first seal 540 is sealed between the first joint 520 and the first end cover 200, and the second seal 550 is sealed between the second joint 530 and the second end cover 300.

[0032] See also Figure 1 and Figure 2 In some embodiments of the present invention, the first end cover 200 is provided with a connection kit 600 for connecting the second end cover 300 of another battery cell, thereby realizing connection of multiple battery cells.

[0033] In some embodiments of the present invention, the first end cap 200 is provided with a first internal thread 220, the second end cap 300 is provided with a second internal thread 320, the connection kit 600 is provided with a first external thread 610 connected to the first internal thread 220, and the connection kit 600 is provided with a second external thread 620 matching the second internal thread 320. That is, two adjacent battery cells are connected by a threaded structure, the number of battery cells connected in series can be freely adjusted, and when only one battery cell is used, the connection kit 600 can also be removed from the battery cell without affecting the use.

[0034] In some embodiments of the present invention, the battery cell assembly 400 includes a winding core assembly and an electrolyte located within the accommodating space, and a liquid injection port is provided on the first end cover 200 and / or the second end cover 300, and a safety valve 700 is detachably installed on the liquid injection port.

[0035] See also Figure 2 or Figure 3 The present invention also proposes a battery pack, comprising at least two battery cells of any of the above technical solutions, wherein the battery cells are sequentially connected in series through a connection kit 600, and the heat exchange tubes 500 on adjacent battery cells are connected. After the external fluid is input from the heat exchange tube 500 at one end of the above battery pack, the fluid can be output from the heat exchange tube 500 at the other end of the battery pack, thereby performing heat exchange on all battery cells of the battery pack.

[0036] See also Figure 1 and Figure 2 In some embodiments of the present invention, a closed chamber 800 is formed between adjacent battery cells and the corresponding connection kit 600 , and the heat exchange tubes 500 on adjacent battery cells are all connected to the closed chamber 800 .

[0037] See also Figure 3In some embodiments of the present invention, adjacent heat exchange tubes 500 are connected via a third connector 900, and the interior of the third connector 900 is provided with an inner hole channel connected to the interior of the adjacent heat exchange tube 500. All heat exchange tubes 500 are connected to form a closed pipeline, and there is no need to use the closed chamber 800 in the above embodiment to achieve communication.

[0038] See also Figure 1 and Figure 2 In some embodiments of the present invention, the side wall of the connection kit 600 is provided with a through hole 630 for connecting the closed chamber 800 with the outside, and the through hole 630 is detachably installed with a sealing plug for sealing the through hole 630. When the inside of the heat exchange tube 500 does not pass the external fluid, the sealing plug is removed from the through hole 630, and the heat conducted to the first end cover 200 and the second end cover 300 can be discharged from the through hole 630 in the form of hot air flow, or the external air flow can enter the closed chamber 800 from the through hole 630 to exchange heat with the first end cover 200 and the second end cover 300.

[0039] In some embodiments of the present invention, a plurality of through holes 630 distributed around the axis of the heat exchange tube 500 are provided on the side wall of the connection kit 600, which is beneficial to improving the heat exchange efficiency.

[0040] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0041] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art 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 battery cell, characterized in that: include: A cylinder (100), wherein two ends of the cylinder (100) are respectively provided with a first end cover (200) and a second end cover (300), the cylinder (100), the first end cover (200) and the second end cover (300) define an accommodation space, and a battery cell assembly (400) is provided in the accommodation space; A heat exchange tube (500) is provided on the first end cover (200) and the second end cover (300), the heat exchange tube (500) passes through the accommodating space, and the outer wall of the heat exchange tube (500) is in contact with the battery core assembly (400); The first end cover (200) is provided with a connection kit (600) for connecting to the second end cover (300) of another battery cell; the first end cover (200) is provided with a first internal thread (220), the second end cover (300) is provided with a second internal thread (320), the connection kit (600) is provided with a first external thread (610) connected to the first internal thread (220), and the connection kit (600) is provided with a second external thread (620) matching the second internal thread (320); A closed chamber (800) is formed between adjacent battery cells and the corresponding connection kit (600), and the heat exchange tubes (500) are all connected to the closed chamber (800); a through hole (630) is provided on the side wall of the connection kit (600) for connecting the closed chamber (800) with the outside, and a sealing plug for sealing the through hole (630) is detachably installed on the through hole (630).

2. A battery cell according to claim 1, characterized in that: The heat exchange tube (500) comprises a central tube (510), a first joint (520) and a second joint (530); the first end cover (200) and the second end cover (300) are respectively provided with a first mounting hole and a second mounting hole adapted to the central tube (510); the first joint (520) is detachably connected to one end of the central tube (510) and is pressed onto the first end cover (200); the second joint (530) is detachably connected to the other end of the central tube (510) and is pressed onto the second end cover (300); the first joint (520) and the second joint (530) are respectively provided with a first through hole (521) and a second through hole (531) connected to the interior of the central tube (510).

3. A battery cell according to claim 2, characterized in that: Both ends of the central tube (510) are threadedly connected to the first joint (520) and the second joint (530), respectively.

4. A battery cell according to claim 2, characterized in that: The invention also includes a first seal (540) and a second seal (550), wherein the first seal (540) is sealingly disposed between the first joint (520) and the first end cover (200), and the second seal (550) is sealingly disposed between the second joint (530) and the second end cover (300).

5. A battery pack, characterized in that: Comprising at least two battery cells according to any one of claims 1 to 4, the battery cells are sequentially connected in series via a connection kit (600), and the heat exchange tubes (500) on adjacent battery cells are connected to each other; Adjacent heat exchange tubes (500) are connected via a third connector (900), and an inner hole channel communicating with the inner part of the adjacent heat exchange tube (500) is provided inside the third connector (900).

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