Cylindrical battery pack

Abstract

The utility model provides a cylindrical battery pack, and relates to the field of cylindrical batteries, the cylindrical battery pack comprises battery cells, a plurality of battery cells are annularly distributed around the battery cell at the central position to form an annular battery cell module; at least one layer of annular battery cell module is arranged in the cylindrical battery pack; and in each layer of annular battery cell module, the battery cells are uniformly arranged at intervals along the circumferential direction. And the battery cells are fixed together through connecting parts. According to the utility model, the annular battery cell layout is adopted to replace the traditional rectangular array layout, so that the gaps of the battery cells are reduced, the space of the battery pack is fully utilized, the volume utilization rate of the battery pack is improved, and the energy storage capacity of the battery pack in a limited space is improved; and the cruising ability of the electric bicycle can be greatly guaranteed.

Description

Technical Field

[0001] The utility model belongs to the field of cylindrical batteries, and in particular relates to a cylindrical battery pack. Background Art

[0002] Cylindrical battery is a common battery with important application value, which is cylindrical in shape. The structure of cylindrical battery mainly includes metal shell, positive and negative electrodes and electrolyte. Its working principle is based on electrochemical reaction, generating current through the potential difference between positive and negative electrodes. With the development of science and technology, cylindrical battery technology is also constantly improving and optimizing. At present, cylindrical batteries are mainly divided into lithium-ion cylindrical batteries and nickel-cadmium cylindrical batteries. Among them, lithium-ion cylindrical batteries have higher energy density and longer service life, becoming the mainstream of the market. In addition, cylindrical batteries also have a variety of specifications in size and capacity to meet the needs of different application scenarios.

[0003] A cylindrical battery pack is a battery system that integrates multiple cylindrical batteries, usually composed of multiple cylindrical batteries connected in series or in parallel. This battery pack has the advantages of high energy density, high power density, easy integration and convenient carrying, and has been widely used in the field of electric bicycles. A cylindrical battery pack usually consists of multiple cylindrical batteries arranged in a battery box and connected together in series or in parallel. Among them, each cylindrical battery has a certain voltage and capacity. By combining multiple cylindrical batteries, a higher voltage or a larger capacity can be achieved to meet the energy storage needs of electric bicycles.

[0004] In existing cylindrical battery packs, the cells are arranged in a rectangular array. This arrangement has the following disadvantages: large gaps between the cells, low volume utilization of the battery pack, and less energy stored in the battery at the same volume. Due to the volume limitation of electric bicycles, the energy storage of the battery pack is very limited, which greatly limits the endurance of the electric vehicle. Utility Model Content

[0005] In view of this, the present invention aims to provide a cylindrical battery pack to solve the above technical problems.

[0006] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0007] A cylindrical battery pack, comprising:

[0008] A battery cell, wherein a plurality of battery cells are distributed in a ring shape around a battery cell at a central position, forming a ring-shaped battery cell module;

[0009] At least one layer of annular battery cell modules is provided in the cylindrical battery pack;

[0010] In each layer of the annular battery cell module, the battery cells are evenly spaced along the circumferential direction.

[0011] Furthermore, the battery cells are fixed together by connecting components.

[0012] Furthermore, the connecting component includes an annular connecting portion, and a plurality of battery cells in each layer of the annular battery cell module are connected together along the circumferential direction through the annular connecting portion.

[0013] Furthermore, the connecting component also includes a radial connecting portion, which radiates outward from the battery cell located at the center of the cylindrical battery pack and is used to connect the annular battery cell module and the battery cell at the center into a whole.

[0014] Furthermore, the connecting component also includes a fixing portion, which is wrapped around the periphery of the battery core and connected with the annular connecting portion and the radial connecting portion to fix the battery core.

[0015] Furthermore, a heat dissipation opening is provided on the fixing portion.

[0016] Furthermore, it also includes a cooling plate, which is arranged at the positive end of the battery cell;

[0017] A cooling cavity for containing coolant is arranged inside the cooling plate.

[0018] Furthermore, a liquid inlet and a liquid outlet are respectively formed on both sides of the cooling plate.

[0019] Furthermore, a plurality of receiving grooves are provided on the upper surface of the cooling plate for fixing the ends of the battery cells.

[0020] Furthermore, the heat dissipation opening is composed of a plurality of strip-shaped through holes;

[0021] Or the heat dissipation opening is composed of a plurality of circular through holes, and the plurality of circular through holes are arranged in a rectangular array.

[0022] Compared with the prior art, the cylindrical battery pack described in the utility model has the following beneficial effects:

[0023] (1) The cylindrical battery pack described in the present invention adopts a ring-shaped battery cell layout to replace the traditional rectangular array layout, which reduces the gap between the battery cells, fully utilizes the battery pack space, improves the volume utilization of the battery pack, and increases the energy storage of the battery pack in a limited space. Applying the above-mentioned battery pack to an electric bicycle can greatly guarantee the endurance of the electric bicycle.

[0024] (2) The cylindrical battery pack described in the present invention connects the battery cells into a whole through connecting components, fixes the battery cells, and reinforces them in the circumferential direction and radial direction, thereby ensuring the stability of the ring structure composed of the battery cells and guaranteeing the service life of the battery pack.

[0025] (3) The cylindrical battery pack described in the utility model has a heat dissipation port at the portion where the connecting component covers the battery cell, which provides a limit for the battery cell while taking into account the heat dissipation of the battery cell, thereby preventing the battery performance from being affected by the temperature increase of the battery cell, extending the battery life, eliminating the risk of explosion due to thermal runaway of the battery, and ensuring the safety of battery use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0027] Figure 1 It is a schematic diagram of the structure of the utility model;

[0028] Figure 2 It is a schematic diagram of the structure of the utility model;

[0029] Figure 3 It is a structural schematic diagram of the connecting component of the utility model;

[0030] Figure 4 It is a structural schematic diagram of the connecting component of the utility model;

[0031] Figure 5 This is a schematic diagram of the structure of the cooling plate of the utility model;

[0032] Figure 6 It is a longitudinal cross-sectional view of the cooling plate of the utility model.

[0033] Description of reference numerals:

[0034] 1-battery core; 2-connecting component; 21-fixing part; 22-annular connecting part; 23-radial connecting part; 24-heat dissipation port; 3-cooling plate; 31-liquid inlet; 32-containing groove; 33-liquid outlet; 34-cooling chamber. DETAILED DESCRIPTION

[0035] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0036] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 an indirect connection 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 by specific circumstances.

[0038] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0039] The utility model provides a cylindrical battery pack, including a battery cell 1, wherein a plurality of battery cells 1 are distributed in a ring shape around a battery cell 1 at a central position to form a ring-shaped battery cell 1 module; at least one layer of ring-shaped battery cell 1 modules is arranged in the cylindrical battery pack; in each layer of the ring-shaped battery cell 1 modules, the battery cells 1 are evenly spaced along the circumferential direction. The battery cells 1 are fixed together by connecting components 2. The utility model adopts a ring-shaped battery cell 1 layout to replace the traditional rectangular array layout, thereby reducing the gaps between the battery cells 1, making full use of the battery pack space, improving the volume utilization of the battery pack, and increasing the energy storage of the battery pack in a limited space. Applying the above-mentioned battery pack to an electric bicycle can greatly guarantee the endurance of the electric bicycle. In a specific embodiment, as shown in the attached Figure 1 , 2As shown, a battery cell 1 is arranged at the center of the cylindrical battery pack, and a ring-shaped battery cell 1 module consisting of several battery cells 1 is arranged around the battery cell 1. In practical applications, the number of layers of the ring-shaped battery cell 1 module can be appropriately increased according to the needs of different application scenarios. It should be noted that the uniform spacing of the battery cells 1 along the circumferential direction in the several layers of the ring-shaped battery cell 1 modules is the same, and the number of battery cells 1 in the ring-shaped battery cell 1 module increases layer by layer from the inside to the outside. Specifically, when applied to electric bicycles, due to the limitation of the installation position, the number of layers of the ring-shaped battery cell 1 module is preferably not more than two layers.

[0040] As attached Figure 3 , 4 As shown, the connecting component 2 includes an annular connecting portion 22, a radial connecting portion 23 and a fixing portion 21, and a plurality of battery cells 1 in each layer of the annular battery cell 1 module are connected together in the circumferential direction through the annular connecting portion 22. The radial connecting portion 23 radiates outward with the battery cell 1 located at the center of the cylindrical battery pack as the center, and is used to connect the annular battery cell 1 module and the battery cell 1 at the center into a whole. The fixing portion 21 is coated on the periphery of the battery cell 1, connected with the annular connecting portion 22 and the radial connecting portion 23, and is used to fix the battery cell 1. The battery cells 1 are connected as a whole by the connecting component 2, and the battery cells 1 are fixed, and are reinforced in the circumferential direction and the radial direction respectively, thereby ensuring the stability of the annular structure composed of the battery cells 1 and ensuring the service life of the battery pack. A heat dissipation port 24 is provided on the fixing portion 21. A heat dissipation port 24 is provided at the portion where the connecting component 2 covers the battery cell 1, which provides a limit for the battery cell 1 while taking into account the heat dissipation of the battery cell 1, thereby preventing the battery performance from being affected by the temperature increase of the battery cell 1, extending the battery life, eliminating the risk of explosion due to thermal runaway of the battery, and ensuring the safety of battery use.

[0041] Furthermore, the cylindrical battery pack further includes a cooling plate 3, which is arranged at the positive end of the battery cell 1. Figure 5 , 6 As shown, a cooling cavity 34 for containing coolant is provided inside the cooling plate 3. A liquid inlet 31 and a liquid outlet 33 are respectively formed on both sides of the cooling plate 3. A plurality of receiving grooves 32 are provided on the upper end surface of the cooling plate 3 for fixing the ends of the battery cells 1. Preferably, the cooling plate 3 is designed as a polygonal structure in conjunction with the annular arrangement of the battery cells 1. The cooling plate 3 uses the coolant to transfer heat, reduce the temperature of the battery cells 1, prevent the battery from overheating and thermal runaway, and also improve the charging and discharging performance and life of the battery.

[0042] In a specific embodiment, as shown in the attached Figure 1 , 3 As shown, the heat dissipation opening 24 on the connecting component 2 is composed of a plurality of strip-shaped through holes. Figure 2 , 4As shown, the heat dissipation opening 24 is composed of a plurality of circular through holes, and the plurality of circular through holes are arranged in a rectangular array.

[0043] In practical applications, a shell is provided outside the cylindrical battery pack for packaging.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cylindrical battery pack, characterized in that: include: A battery cell, wherein a plurality of battery cells are distributed in a ring shape around a battery cell at a central position, forming a ring-shaped battery cell module; At least one layer of annular battery cell modules is provided in the cylindrical battery pack; In each layer of the annular battery cell module, the battery cells are evenly spaced along the circumferential direction.

2. A cylindrical battery pack according to claim 1, characterized in that: The battery cells are fixed together by connecting components.

3. A cylindrical battery pack according to claim 2, characterized in that: The connecting component comprises an annular connecting portion, and a plurality of cells in each layer of the annular cell module are connected together along the circumferential direction via the annular connecting portion.

4. A cylindrical battery pack according to claim 3, characterized in that: The connecting component also includes a radial connecting portion, which radiates outward from the battery cell located at the center of the cylindrical battery pack and is used to connect the annular battery cell module and the battery cell at the center into a whole.

5. A cylindrical battery pack according to claim 4, characterized in that: The connecting component also includes a fixing portion, which is wrapped around the periphery of the battery core and connected with the annular connecting portion and the radial connecting portion to fix the battery core.

6. A cylindrical battery pack according to claim 5, characterized in that: The fixing part is provided with a heat dissipation opening.

7. The cylindrical battery pack according to claim 1, characterized in that: Also included is a cooling plate, which is disposed at the positive end of the battery cell; A cooling cavity for containing coolant is arranged inside the cooling plate.

8. A cylindrical battery pack according to claim 7, characterized in that: A liquid inlet and a liquid outlet are respectively formed on both sides of the cooling plate.

9. The cylindrical battery pack according to claim 7, characterized in that: The upper surface of the cooling plate is provided with a plurality of receiving grooves for fixing the ends of the battery cells.

10. A cylindrical battery pack according to claim 6, characterized in that: The heat dissipation opening is composed of a plurality of strip-shaped through holes; Or the heat dissipation opening is composed of a plurality of circular through holes, and the plurality of circular through holes are arranged in a rectangular array.

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