Battery pack heat dissipation structure

Abstract

The utility model provides a battery pack heat dissipation structure which comprises a shell, a pair of end part heat dissipation pieces and a side heat dissipation piece, the end part heat dissipation pieces are respectively arranged at the top and the bottom of the shell, two ends of a cylindrical battery are respectively fixed on the end part heat dissipation pieces, and the end part heat dissipation pieces are used for dissipating heat from the end parts of the cylindrical battery; a first cooling cavity allowing cooling liquid to circulate is formed in the end heat dissipation piece. The side heat dissipation piece is arranged in the shell, the cylindrical battery is mounted in the side heat dissipation piece, and the side heat dissipation piece is used for dissipating heat from the cylindrical surface of the cylindrical battery. According to the utility model, the end part heat dissipation piece is arranged to dissipate heat for the end part of the cylindrical battery, so that the risk of thermal runaway caused by the fact that a large amount of heat is concentrated at the end part of the battery is avoided, the heat dissipation effect of the battery is greatly improved, the heat dissipation efficiency is improved, and the safety performance of the battery is greatly guaranteed.

Description

Technical Field

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

[0002] Cylindrical battery is a kind of battery with high capacity, long cycle life and wide operating temperature range. Its products are widely used in solar lamps, lawn lamps, backup energy, power tools, toy models, and photovoltaic energy. Cylindrical batteries are divided into different systems of lithium iron phosphate, lithium cobalt oxide, lithium manganese oxide, cobalt-manganese mixture, and ternary materials. The outer shell is divided into steel shell and polymer. Batteries of different material systems have different advantages. The main ones are steel shell cylindrical lithium iron phosphate batteries, which have the advantages of high capacity, high output voltage, good charge and discharge cycle performance, stable output voltage, large current discharge, electrochemical stability, safety in use (will not cause combustion or explosion due to improper operation such as overcharging, over-discharging and short circuit), wide operating temperature range, and environmental friendliness. A cooling plate is usually required in a cylindrical battery pack to dissipate heat from the battery. The cooling structure in the prior art usually only contacts the side of the battery. Since the current density at the end of the cylindrical battery is relatively high under working conditions, a large amount of heat is concentrated at the end of the battery. The traditional cooling structure cannot dissipate heat at the end of the battery, resulting in low heat dissipation efficiency of the battery pack. There is a risk of thermal runaway of the battery due to excessive temperature in the battery pack. Utility Model Content

[0003] In view of this, the utility model aims to provide a battery pack heat dissipation structure to solve the above technical problems.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] A heat dissipation structure for a battery pack, comprising a housing and a pair of end heat dissipators, wherein the end heat dissipators are respectively arranged at the top and bottom of the housing, and the two ends of a cylindrical battery are respectively fixed on the end heat dissipators, and the end heat dissipators are used to dissipate heat from the ends of the cylindrical battery;

[0006] A first cooling cavity for cooling liquid to flow is provided inside the end heat sink.

[0007] Furthermore, it also includes a side heat sink, which is arranged inside the shell, and the cylindrical battery is installed in the side heat sink, and the side heat sink is used to dissipate heat from the cylindrical surface of the cylindrical battery.

[0008] Furthermore, a plurality of fixing grooves for fixing the ends of the cylindrical batteries are provided on the inner end surface of the end heat sink.

[0009] Furthermore, a first liquid inlet pipe and a first liquid outlet pipe are formed on the outer end surface of the end heat sink, and the first liquid inlet pipe, the first liquid outlet pipe and the first cooling cavity are connected.

[0010] Furthermore, the side heat dissipation element includes a plurality of heat dissipation bars arranged in parallel, and the heat dissipation bars are of a wavy structure.

[0011] Furthermore, a second cooling cavity for circulating coolant is provided in the heat sink.

[0012] Furthermore, the ends of the plurality of heat sinks are connected together via a connecting channel, and the connecting channel is connected through the second cooling cavity.

[0013] Furthermore, a second liquid outlet pipe and a second liquid inlet pipe are formed on both sides of the side heat dissipation element.

[0014] Furthermore, the shell is provided with a through hole for the second liquid outlet pipe and the second liquid inlet pipe to extend out.

[0015] Furthermore, the end heat sink is a plate-shaped structure.

[0016] Compared with the prior art, the battery pack heat dissipation structure described in the utility model has the following beneficial effects:

[0017] In the heat dissipation structure of the battery pack described in the utility model, by providing an end heat dissipation member, heat is dissipated at the end of the cylindrical battery, thereby avoiding the risk of thermal runaway caused by a large amount of heat concentrated at the end of the battery, greatly improving the heat dissipation effect of the battery, improving the heat dissipation efficiency, and bringing great protection to the safety performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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:

[0019] Figure 1 It is a schematic diagram of the structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the utility model (with the housing hidden);

[0021] Figure 3 This is a schematic diagram of the structure of the utility model (the end heat sink and the housing at the top are hidden);

[0022] Figure 4 It is a schematic diagram of the structure of the end heat sink of the utility model;

[0023] Figure 5 It is a longitudinal cross-sectional view of the end heat sink of the utility model;

[0024] Figure 6 It is a schematic structural diagram of the side heat dissipation element of the utility model.

[0025] Description of reference numerals:

[0026] 1-end heat sink; 11-first liquid inlet pipe; 12-first liquid outlet pipe; 13-fixing groove; 14-first cooling chamber; 2-housing; 3-side heat sink; 31-second liquid inlet pipe; 32-second liquid outlet pipe; 33-heat sink; 34-connecting channel; 4-cylindrical battery. DETAILED DESCRIPTION

[0027] 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.

[0028] 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.

[0029] 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.

[0030] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0031] The utility model provides a heat dissipation structure of a battery pack, comprising a shell 2 and a pair of end heat dissipators 1, wherein the end heat dissipators 1 are respectively arranged at the top and bottom of the shell 2, and the two ends of the cylindrical battery 4 are respectively fixed on the end heat dissipators 1, and the end heat dissipators 1 are used to dissipate heat from the ends of the cylindrical battery 4; a first cooling cavity 14 for the circulation of coolant is provided inside the end heat dissipator 1. The heat dissipation structure of the battery pack also includes a side heat dissipator 3, wherein the side heat dissipator 3 is arranged inside the shell 2, and the cylindrical battery 4 is installed in the side heat dissipator 3, and the side heat dissipator 3 is used to dissipate heat from the cylindrical surface of the cylindrical battery 4.

[0032] The end heat sink 1 is a plate-like structure. The inner end surface of the end heat sink 1 is provided with a plurality of fixing grooves 13 for fixing the ends of the cylindrical batteries 4. The outer end surface of the end heat sink 1 is provided with a first liquid inlet pipe 11 and a first liquid outlet pipe 12, and the first liquid inlet pipe 11 and the first liquid outlet pipe 12 are connected to the first cooling chamber 14.

[0033] The side heat sink 3 includes a plurality of heat sinks 33 arranged in parallel, and the heat sinks 33 are of a wavy structure. A second cooling cavity for the circulation of coolant is provided in the heat sink 33. The ends of the plurality of heat sinks 33 are connected together by a connecting channel 34, and the connecting channel 34 is connected to the second cooling cavity. A second liquid outlet pipe 32 and a second liquid inlet pipe 31 are formed on both sides of the side heat sink 3. A through hole for the second liquid outlet pipe 32 and the second liquid inlet pipe 31 to extend out is provided on the housing 2.

[0034] The working principle of the utility model is as follows: the end heat sink 1 is arranged at both ends of the cylindrical battery 4, the coolant flows into the first cooling cavity 14 through the first liquid inlet pipe 11 of the end heat sink 1, exchanges heat with the battery end, and finally discharges the heat sink from the first liquid outlet pipe 12. At the same time, the coolant flows into the side heat sink 3 from the second liquid inlet pipe 31, and is evenly distributed to a plurality of heat sinks 33 through the connecting channel 34, exchanges heat with the side of the cylindrical battery 4, and finally discharges the side heat sink 3 from the second liquid outlet pipe 32.

[0035] The utility model dissipates heat at the ends of the cylindrical batteries 4 by providing an end heat sink 1, thereby avoiding the risk of thermal runaway caused by a large amount of heat concentrated at the ends of the batteries, greatly improving the heat dissipation effect of the batteries, improving the heat dissipation efficiency, and bringing great protection to the safety performance of the batteries.

[0036] 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.

[0037] 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 battery pack heat dissipation structure, characterized in that: It includes a housing and a pair of end heat sinks, wherein the end heat sinks are respectively arranged at the top and bottom of the housing, and the two ends of the cylindrical battery are respectively fixed on the end heat sinks, and the end heat sinks are used to dissipate heat from the ends of the cylindrical battery; The end heat sink is provided with a first cooling cavity for the circulation of coolant; A plurality of fixing grooves for fixing the ends of the cylindrical batteries are provided on the inner end surface of the end heat sink; The outer end surface of the end heat sink is provided with a first liquid inlet pipe and a first liquid outlet pipe, and the first liquid inlet pipe, the first liquid outlet pipe and the first cooling cavity are connected; The end heat sink is a plate-shaped structure.

2. The heat dissipation structure of the battery pack according to claim 1, characterized in that: It also includes a side heat sink, which is arranged inside the shell, and the cylindrical battery is installed in the side heat sink, and the side heat sink is used to dissipate heat from the cylindrical surface of the cylindrical battery.

3. The heat dissipation structure of the battery pack according to claim 1, characterized in that: The side heat sink includes a plurality of heat sinks arranged in parallel, and the heat sinks are of a wave-shaped structure.

4. The heat dissipation structure of the battery pack according to claim 3, characterized in that: A second cooling cavity for cooling liquid to flow is provided in the heat sink.

5. The heat dissipation structure of the battery pack according to claim 4, characterized in that: The ends of the plurality of heat sinks are connected together through a connecting channel, and the connecting channel is connected through the second cooling cavity.

6. The heat dissipation structure of the battery pack according to claim 2, characterized in that: The side heat dissipating element is provided with a second liquid outlet pipe and a second liquid inlet pipe on both sides.

7. The heat dissipation structure of the battery pack according to claim 6, characterized in that: The shell is provided with a through hole for the second liquid outlet pipe and the second liquid inlet pipe to extend out.

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