CN204928300U - Balanced cooling system of lithium cell - Google Patents

Abstract

A balanced heat dissipation system for a lithium battery, comprising a balanced circuit board in contact with each other, an insulating and heat-conducting component, and a system control circuit. The output end of the control circuit is connected to the input end of the control circuit with a unidirectional signal, the equalization circuit is connected in series with the battery nodes on the lithium battery module through an external interface, and the equalization circuit is connected to the system control circuit with a bidirectional signal. This design has the characteristics of strong heat dissipation capability and controllable heat dissipation process.

Description

A balanced cooling system for lithium batteries

technical field

The utility model belongs to the technical field of battery management, in particular to a balanced cooling system for a lithium battery, which is suitable for controlling the cooling process and improving the cooling capacity.

Background technique

Faced with the huge pressure of energy shortage and environmental pollution, electric vehicles are becoming more and more popular. Electric vehicles replace oil with electricity, which can achieve "zero emission" and low noise, and are an important means to solve energy and environmental problems. With the shortage of oil resources and the development of battery technology, electric vehicles are close to or even superior to traditional fuel vehicles in terms of performance and economy, and have begun to be gradually promoted and applied worldwide.

Today's electric vehicles mainly use lithium-ion battery modules to store electrical energy. The composition of the lithium battery module is as follows: multiple battery cells are connected in parallel to form a node, and multiple nodes are connected in series to form a battery module. When the battery is working, the battery management system must be used to detect and control the working status of the battery. When the voltage of the battery is unbalanced, the battery with too high voltage must be discharged to ensure the life of the battery. The discharge process is called " for battery balancing". The existing battery equalization circuit generates a lot of heat during battery equalization, and cannot increase the equalization current, resulting in too long equalization time.

Chinese patent: The authorized announcement number is CN203691015U, and the authorized announcement date is July 2, 2014. The utility model patent discloses a balanced resistance heat dissipation system for new energy vehicles, including a metal shell, and an insulating and heat-conducting silicone pad is provided under the metal shell. There is a circuit board under the insulating and heat-conducting silicone pad, and a number of uniformly arranged equalizing resistors are fixed on the surface of the circuit board. The metal shell, the insulating and heat-conducting silicone pad, and the circuit board are parallel to each other, and the metal shell and the insulating and heat-conducting silicone pad are closely attached. Although this utility model can effectively reduce the temperature rise caused by the heating of the balancing resistor, the heat generated by the balancing resistor is dissipated through the insulating heat-conducting silica gel and the metal shell. control, prone to accidents.

Contents of the invention

The purpose of the utility model is to overcome the problem in the prior art that the heat dissipation process cannot be controlled, and provide a lithium battery balanced heat dissipation system with controllable heat dissipation process.

For realizing above object, the technical scheme of the present utility model is as follows:

A balanced heat dissipation system for a lithium battery, comprising a balanced circuit board in contact with each other and insulating and heat-conducting components, the balanced circuit board is connected in series with the lithium battery module;

The heat dissipation system also includes a system control circuit, and the equalization circuit board is a high-voltage heat-conducting circuit board, on which a temperature monitoring circuit and a plurality of equalization circuits are arranged;

The output end of the temperature monitoring circuit is connected to the input end of the control circuit with a unidirectional signal, the equalization circuit is connected in series with the battery nodes on the lithium battery module, and the equalization circuit is connected to the system control circuit with a bidirectional signal.

The heat dissipation system also includes a box-shaped heat dissipation housing, the balanced circuit board, insulating and heat-conducting components, and the system control circuit are all located inside the box-shaped heat-dissipating housing, and the two sides of the insulating and heat-conducting components are respectively connected to the balanced circuit board and the box-shaped heat dissipation The inner walls of the housing are in contact.

The box-shaped heat-dissipating shell includes a box body and a matching box cover. The equalization circuit board, insulating and heat-conducting components, and system control circuits are all located inside the box body, and the insulating and heat-conducting components are in contact with the inner wall of the box cover.

A heat dissipation medium is arranged on the box cover.

The heat dissipation medium is an air-cooled or water-cooled heat sink.

The manufacturing material of the box-shaped heat dissipation housing is aluminum alloy.

The insulating and heat-conducting component is a flexible insulating and heat-conducting component.

The balancing circuit is correspondingly connected in series with the battery nodes through the external interface.

Compared with the prior art, the beneficial effects of the utility model are:

1. A lithium battery balanced heat dissipation system of the utility model includes a system control circuit. The balanced circuit board is a high-voltage heat-conducting circuit board, and a temperature monitoring circuit and a plurality of balancing circuits are arranged on it. The output terminal of the temperature monitoring circuit is connected to the control circuit. The input end is connected to a unidirectional signal, and the balancing circuit is connected in series with the battery nodes on the lithium battery module, and the balancing circuit is connected to the system control circuit in a bidirectional signal connection. During operation, the temperature monitoring circuit monitors the actual temperature of the balancing circuit board in real time, and Feedback the detection value to the system control circuit, the system control circuit will compare the detection value with the preset temperature alarm value to judge whether the equalization circuit continues to work, if the detection value exceeds the temperature alarm value, the system control circuit will control The equalization circuit stops working, and this design realizes the active control of the heat dissipation process, which can effectively avoid the occurrence of accidents. Therefore, the utility model realizes active control of heat dissipation.

2. The balanced circuit board in the balanced heat dissipation system for lithium batteries of the utility model adopts a high-voltage heat-conducting circuit board, which is beneficial to the uniform heat conduction of the entire circuit board. The box-shaped heat-dissipating shell is made of aluminum alloy with good heat conduction and heat dissipation performance. Moreover, a heat dissipating medium is arranged on the box cover, and this design further improves the heat dissipation capacity of the heat dissipation system. Therefore, the utility model has strong heat dissipation capability.

Description of drawings

Fig. 1 is a schematic diagram of an exploded structure of the utility model.

Fig. 2 is a system structure diagram of the utility model.

In the figure: balanced circuit board 1, temperature monitoring circuit 11, balanced circuit 12, insulating and heat-conducting component 2, system control circuit 3, box-shaped heat dissipation shell 4, box body 41, box cover 42, heat dissipation medium 5, external interface 6 , lithium battery module 7, battery node 71.

detailed description

The utility model will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Referring to Fig. 1 and Fig. 2, a balanced heat dissipation system for a lithium battery includes a balanced circuit board 1 in contact with each other, an insulating and heat-conducting component 2, and the balanced circuit board 1 is connected in series with a lithium battery module 7;

The heat dissipation system also includes a system control circuit 3, and the equalization circuit board 1 is a high-voltage heat-conducting circuit board, on which a temperature monitoring circuit 11 and a plurality of equalization circuits 12 are arranged;

The output end of the temperature monitoring circuit 11 is connected to the input end of the control circuit 3 with a unidirectional signal, the equalization circuit 12 is connected in series with the battery node 71 on the lithium battery module 7, and the equalization circuit 12 is connected to the system control circuit 3 Bi-directional signal connection.

The heat dissipation system also includes a box-shaped heat-dissipating shell 4, the balanced circuit board 1, the insulating and heat-conducting component 2, and the system control circuit 3 are all located inside the box-shaped heat-dissipating shell 4, and the two sides of the insulating and heat-conducting component 2 are respectively connected to the balance The circuit board 1 and the inner wall of the box-shaped heat dissipation housing 4 are in contact with each other.

The box-shaped heat dissipation housing 4 includes a box body 41 and a box cover 42 matched therewith. The balanced circuit board 1, the insulating and heat-conducting component 2, and the system control circuit 3 are all located inside the box body 41, and the insulating and heat-conducting component 2 is connected to the box. The inner walls of the cover 42 are in contact.

The box cover 42 is provided with a heat dissipating medium 5 .

The heat dissipation medium 5 is an air-cooled or water-cooled heat sink.

The manufacturing material of the box-shaped heat dissipation housing 4 is aluminum alloy.

The insulating and heat-conducting component 2 is a flexible insulating and heat-conducting component.

The balancing circuit 12 is correspondingly connected in series with the battery node 71 through the external interface 6 .

The principle of the utility model is described as follows:

The utility model proposes a heat dissipation system combining passive heat dissipation and active control, which has the characteristics of strong heat dissipation capacity and controllable heat dissipation process, and effectively solves the problem that the balanced current cannot be increased due to poor heat dissipation when the lithium-ion battery is in balanced operation. technical problem. Its specific working principle is as follows:

Passive heat dissipation: Since the balanced circuit board 1, the insulating and heat-conducting component 2, the box cover 42, and the heat dissipating medium 5 are sequentially contacted in the utility model, the heat generated by the heating element installed on the balanced circuit board 1 can pass through the balanced circuit board 1, The insulating and heat-conducting component 2, the box cover 42, and the heat dissipating medium 5 are dissipated as much as possible, thereby reducing the temperature of the heating element.

Active control: a temperature monitoring circuit 11 is provided on the equalization circuit board 1 to monitor the actual temperature of the equalization circuit board 1, and feed back the detected value to the system control circuit 3, and the system control circuit 3 will compare the detected value with the The preset temperature alarm value is compared, and if the detection value exceeds the temperature alarm value, the system control circuit 3 will control the equalization circuit to stop working, so that the equalization function of the cooling system is terminated.

Balanced circuit board 1: The high-voltage heat-conducting circuit board is used, which not only can effectively conduct the heat emitted by the heating elements on the circuit board to the entire board surface of the circuit board, but also can withstand high voltage to prevent breakdown and leakage.

Insulating and heat-conducting component 2: adopting flexible insulating and heat-conducting components can ensure that the balance circuit board 1 and the box cover 42 can be in close contact to achieve good heat transfer.

System control circuit 3: The system control circuit 3 has the functions of balance control, system executive device control, internal communication, and external communication, which can meet the control requirements of the entire system, and the system control circuit 3 can also have external power supply, external communication and other interfaces .

Box body 41 and box cover 42: both are made of aluminum alloy material with good thermal conductivity and heat dissipation performance, which can dissipate the heat transferred by the insulating and heat-conducting component 2, and at the same time, the box-shaped structure formed by them can play a role in the overall system. Installation and fixing function to ensure the stability of the whole system.

Heat dissipating medium 5: for further dissipating the heat of the box cover 42, so as to ensure that the temperature of the whole system can be further reduced. When the heat dissipating medium 5 adopts an air-cooled heat sink, the system control circuit 3 can control the start-up of the fan according to the temperature detection value fed back, so as to dissipate heat by wind. During design, whether to install this structure can be determined according to the actual heat dissipation requirements of the system.

When there are too many battery nodes in the lithium battery module, multiple heat dissipation systems can be used to work separately to achieve balanced heat dissipation.

Example 1:

Referring to Fig. 1 and Fig. 2, a balanced cooling system for a lithium battery includes a balanced circuit board 1, an insulating and heat-conducting component 2, a system control circuit 3, and a box-shaped heat-dissipating case 4. The balanced circuit board 1 is a high-voltage heat-conducting circuit board , a temperature monitoring circuit 11 and a plurality of equalization circuits 12 are arranged on it, the output end of the temperature monitoring circuit 11 is connected to the input end of the control circuit 3 in a unidirectional signal, and the equalization circuit 12 is connected to the lithium battery module through the external interface 6 The battery nodes 71 on the group 7 are correspondingly connected in series, and the equalizing circuit 12 is connected to the system control circuit 3 with bidirectional signals, the insulating and heat-conducting component 2 is a flexible insulating and heat-conducting component, and the manufacturing material of the box-shaped heat-dissipating shell 4 is aluminum alloy , including the box body 41 and the box cover 42 matched with it, the balanced circuit board 1, the insulating and heat-conducting component 2, and the system control circuit 3 are all located inside the box body 41, and the balanced circuit board 1 passes through the inner wall of the insulating and heat-conducting component 2 and the box cover 42 touch.

Example 2:

With embodiment 1, difference is:

A heat dissipating medium 5 is disposed on the box cover 42 , and the heat dissipating medium 5 is an air-cooled heat sink.

Example 3:

Same as Embodiment 2, the difference lies in: the heat dissipating medium 5 is a water-cooled heat sink.

Claims (8)

1. A balanced heat dissipation system for lithium batteries, comprising balanced circuit boards (1) in contact with each other and insulating and heat-conducting components (2), the balanced circuit board (1) is connected in series with lithium battery modules (7), characterized in that : The heat dissipation system also includes a system control circuit (3), and the equalization circuit board (1) is a high-voltage heat-conducting circuit board, on which a temperature monitoring circuit (11) and a plurality of equalization circuits (12) are arranged; The output end of the temperature monitoring circuit (11) is connected to the input end of the control circuit (3) with a unidirectional signal, and the equalization circuit (12) is connected in series with the battery node (71) on the lithium battery module (7) correspondingly , and the equalization circuit (12) is connected to the system control circuit (3) with bidirectional signals. 2. A lithium battery balanced cooling system according to claim 1, characterized in that: the cooling system also includes a box-shaped cooling case (4), the balanced circuit board (1), insulating and heat-conducting components (2 ), the system control circuit (3) are located inside the box-shaped heat dissipation shell (4), and the two sides of the insulating and heat-conducting component (2) are in contact with the balance circuit board (1) and the inner wall of the box-shaped heat dissipation shell (4) respectively. touch. 3. A lithium battery balanced heat dissipation system according to claim 2, characterized in that: the box-shaped heat dissipation casing (4) includes a box body (41) and a box cover (42) matched therewith, and the balanced The circuit board (1), the insulating and heat-conducting component (2), and the system control circuit (3) are all located inside the box body (41), and the insulating and heat-conducting component (2) is in contact with the inner wall of the box cover (42). 4. The lithium battery balanced heat dissipation system according to claim 3, characterized in that: the box cover (42) is provided with a heat dissipation medium (5). 5. The lithium battery balanced heat dissipation system according to claim 4, characterized in that: the heat dissipation medium (5) is an air-cooled or water-cooled heat sink. 6. The lithium battery balanced heat dissipation system according to claim 2, characterized in that: the box-shaped heat dissipation casing (4) is made of aluminum alloy. 7. A lithium battery balanced heat dissipation system according to any one of claims 1-6, characterized in that: the insulating and heat-conducting component (2) is a flexible insulating and heat-conducting component. 8. A lithium battery balanced heat dissipation system according to any one of claims 1-6, characterized in that: the balanced circuit (12) is correspondingly connected in series with the battery node (71) through the external interface (6).