Battery cooling device and system

Abstract

The utility model discloses a battery cooling device and system. The device is used for a battery cluster, the battery cluster comprises at least one battery pack, and the device comprises at least one water pump which is connected in series or in parallel; the at least one water pump is configured to receive a control signal so as to change the running speed of the at least one water pump; the at least one water pump is connected with the battery cluster through a cooling water pipe, cooling water is arranged in the cooling water pipe, and the cooling water flows to the battery cluster along the cooling water pipe. The operation speed of the water pump can be adjusted according to the working condition of the battery cluster, the control precision is improved, and the energy-saving and environment-friendly effects are achieved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cooling device and system. Background Art

[0002] In recent years, the ship battery system has been developing towards large capacity, high density, and high charge and discharge rate, which has higher and higher requirements for heat dissipation capacity, and the cooling system will be equipped with more and more. The cooling system of the relevant battery is not well optimized for the ship's use environment, and consumes a lot of electricity, which is not energy-saving and environmentally friendly. Utility Model Content

[0003] The embodiments of the present application provide a battery cooling device and system, which can adjust the operating speed of a water pump according to the working conditions of a battery cluster, improve control accuracy, and achieve energy-saving and environmental protection effects.

[0004] To solve the above technical problems, the present application provides the following technical solutions:

[0005] The present application provides a battery cooling device, which is used for a battery cluster, wherein the battery cluster includes at least one battery pack, and the device includes: at least one water pump, wherein the at least one water pump is connected in series or in parallel; the at least one water pump is configured to receive a control signal to change the operating speed of the at least one water pump; the at least one water pump is connected to the battery cluster through a cooling water pipe, wherein cooling water is provided in the cooling water pipe, and the cooling water flows along the cooling water pipe to the battery cluster.

[0006] The present application also provides a battery cooling system, which is used for a battery cluster, wherein the battery cluster includes at least one battery pack, and the battery pack includes a power management module. The system includes the battery cooling device, and the battery management module is configured to send a drive signal to drive the at least one water pump to turn on, and send the control signal to change the operating speed of the water pump.

[0007] By optimizing the battery cooling device suitable for use on ships and performing variable frequency control on the water pump through a control signal, the embodiment of the present application can adjust the operating speed of the water pump according to the working condition of the battery cluster, improve the control accuracy, and achieve energy saving and environmental protection effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0009] Figure 1 A schematic diagram of the structure of a battery cooling device provided in an embodiment of the present application.

[0010] Figure 2A schematic diagram of the structure of another battery cooling device provided in an embodiment of the present application.

[0011] Figure 3 A schematic diagram of the working process of the battery cooling device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0012] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0013] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" 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" and "second" 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, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0014] In the description of the present invention, it should be noted that, unless otherwise clearly defined, 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, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0015] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the utility model. In addition, the utility model can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, and does not indicate the relationship between the various embodiments and / or settings discussed in itself. In addition, the utility model provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials. In some instances, methods, means, components and circuits well known to those skilled in the art are not described in detail, so as to highlight the main purpose of the utility model.

[0016] The embodiment of the present application provides a battery cooling device, which is used for a battery cluster, wherein the battery cluster includes at least one battery pack, and the battery pack includes at least one battery cell. In the present application, the battery cooling device is applied to a ship use environment, and the battery cluster can be arranged on the ship.

[0017] The battery cooling device includes: at least one water pump, which is connected in series or in parallel; the at least one water pump is configured to receive a control signal to change the operating speed of the at least one water pump; the at least one water pump is connected to the battery cluster through a cooling water pipe, and cooling water is provided in the cooling water pipe, and the cooling water flows along the cooling water pipe to the battery cluster.

[0018] The control signal may be a pulse width modulation (PWM) signal, and the duty cycle of the control signal may be adjusted according to the temperature of the battery cell and the rate of increase of the battery cell temperature.

[0019] Figure 1 This is a schematic diagram of the structure of a battery cooling device provided in an embodiment of the present application. Figure 1 As shown, the battery cooling device includes a water pump P-01 and a water pump P-02, and the two water pumps are connected in series on the same branch.

[0020] Figure 2 This is a schematic diagram of the structure of another battery cooling device provided in an embodiment of the present application. Figure 2 As shown, the battery cooling device includes a water pump P-01 and a water pump P-02, and the two water pumps are arranged in parallel.

[0021] The following will specifically combine Figure 1 and Figure 2 The specific structure of the battery cooling device is described.

[0022] In one embodiment, the battery cluster is the cooling object of the battery cooling device, and the heat generated by the battery cluster can be removed by cooling water. Figure 1 and Figure 2 In the embodiment, there are two battery clusters, namely, battery cluster 1 and battery cluster 2. In practical applications, the battery cluster may be a single battery pack or may include multiple battery packs. It should be noted that the cooling object of the battery cooling device may also be a battery pack or a battery group including multiple battery clusters, and the present application does not limit the scope of the cooling object.

[0023] A battery management system (BMS) may be provided in the battery cluster. When the cooling object is a battery pack, the battery management system may also be provided in the battery pack. The battery management system may be used for management and control of the battery system, and may also control the battery cooling device.

[0024] In one embodiment, the at least one water pump is used for cooling water circulation, and the water pump can also be called a cooling water pump. The water pump can be equipped with a Figure 1 or Figure 2 Only one water pump can be removed from the two water pumps. Equipped with one water pump, it is suitable for cooling a single battery pack or a single battery cluster.

[0025] The number of the water pumps may be two. Figure 1 Two water pumps on the same series branch are suitable for single battery clusters or single battery groups. Figure 2 Two water pumps connected in parallel are suitable for situations with multiple battery clusters or multiple battery groups.

[0026] In one embodiment, the device further comprises at least one check valve. When the at least one water pump is connected in parallel, each of the at least one check valve is connected to each of the at least one water pumps in a one-to-one correspondence, and each of the check valves is arranged at the water outlet of each of the water pumps. Figure 2 In the example, the water pump P-01 is connected to the check valve V-051, and the water pump P-02 is connected to the check valve V-052. When the water pumps are connected in parallel, check valves are set to prevent the cooling water from flowing back.

[0027] In one embodiment, the device further comprises a plurality of stop valves, and a stop valve is provided at the water inlet or the water outlet of each water pump of the at least one water pump. A stop valve is provided at the water inlet or the water outlet of each water pump to facilitate the maintenance of the water pump.

[0028] In one embodiment, the device further comprises an expansion water tank, the expansion water tank being respectively connected to the battery cluster and each water pump of the at least one water pump, and the expansion water tank being configured to store cooling water. Figure 1 and Figure 2 In the process, adding cooling water into the expansion water tank V-01 can ensure that there is enough cooling water for the operating components of the device.

[0029] In one embodiment, the device also includes a liquid level meter and a liquid level switch, which are arranged in an expansion water tank, and the liquid level meter is connected to the liquid level switch; the liquid level meter is configured to monitor the water level in the expansion water tank, and the liquid level switch is configured to send a first alarm signal when the water level in the expansion water tank is lower than a preset value.

[0030] In other words, the inner wall of the expansion water tank may also be provided with a liquid level gauge, which is used to indicate the cooling water level in the expansion water tank. The liquid level gauge may be electrically connected to a liquid level switch, and the liquid level switch may be electrically connected to the battery management system. When the cooling water level in the water tank is too low, the liquid level switch may be turned on, triggering an alarm signal and sending it to the battery management system, which generates an alarm.

[0031] In one embodiment, the device further comprises a discharge valve and an air release valve, wherein the discharge valve is arranged on the side of the cooling water pipe connected to the battery cluster close to the water outlet of the water pump, and the air release valve is arranged on the side of the cooling water pipe connected to the battery cluster close to the expansion water tank. A discharge valve is arranged at the lowest point of the cooling water pipeline of each cluster for drainage during maintenance; an air release valve is arranged at the highest point of the cooling water pipeline of each cluster for accelerating the discharge of air in the pipeline when adding cooling water.

[0032] exist Figure 1 In the embodiment, the discharge valve V-01 and the discharge valve V-02 are arranged at the water outlet of the water pump P-02, the air release valve V-01 is arranged on the side of the cooling water pipe connected to the battery cluster 1 close to the expansion water tank, and the air release valve V-02 is arranged on the side of the cooling water pipe connected to the battery cluster 2 close to the expansion water tank. Figure 2 In the figure, the discharge valve V-01 and the discharge valve V-02 are arranged at the water outlet of the heat exchanger E-01, the air release valve V-03 is arranged on the side of the cooling water pipe connected to the battery cluster 1 close to the expansion water tank, and the air release valve V-04 is arranged on the side of the cooling water pipe connected to the battery cluster 2 close to the expansion water tank.

[0033] In one embodiment, the device further comprises a heat exchanger. The heat exchanger is used to dissipate the heat brought out of the battery cluster by the cooling water into the air, so as to perform heat exchange between the cooling water and the air.

[0034] When the at least one water pump is connected in parallel, the input end of the heat exchanger is connected to the water outlet of the at least one water pump, and the output end of the heat exchanger is connected to the battery cluster; when the at least one water pump is connected in series, the heat exchanger is connected in series between any two of the at least one water pump.

[0035] In one embodiment, the device further comprises at least one fan, which is connected to the heat exchanger and is used to accelerate the air circulation near the heat exchanger to increase the heat dissipation efficiency of the heat exchanger. The number of fans can be 1, 2 or more, and the number of fans depends on the size of the heat exchanger and the heat dissipation requirements. The present application does not limit the number of fans. Figure 1 and Figure 2 Fan F-01 and fan F-02 can be set in each unit.

[0036] In one embodiment, the device also includes a temperature sensor, which is respectively connected to the input end and the output end of the heat exchanger, and the temperature sensor is configured to respectively monitor the temperature of the cooling water input to the input end of the heat exchanger and the temperature of the cooling water output from the output end of the heat exchanger. Figure 1 and Figure 2 The heat exchanger E-01 can be set between the corresponding two temperature sensors. Figure 1 In the embodiment, a temperature sensor TT-01 may be provided at the water outlet of the water pump P-01, and a temperature sensor TT-01' may be provided at the water inlet of the water pump P-02; Figure 2 In the embodiment, a temperature sensor TT-01 may be provided on the right side of the check valve at the water outlet of the water pump P-01 and the water pump P-02, and a temperature sensor TT-01' may be provided at the outlet of the heat exchanger. The temperature sensor may be an NTC type.

[0037] In one embodiment, the BMS sends power switch signals for two water pumps, sends a PWM speed control signal for adjusting the speed of the two water pumps, and receives fault feedback signals from the two water pumps. The BMS can also send power switch signals for two fans, receive temperature signals, and receive dry contact signals, which are triggered when the expansion tank has a low liquid level.

[0038] Figure 3 This is a schematic diagram of the working process of the battery cooling device provided in the embodiment of the present application. Figure 3 As shown, after the BMS starts to wake up, it can detect whether the temperature of the battery cell is less than or equal to the first temperature threshold of 35°C. If the temperature of the battery cell is less than or equal to the first temperature threshold of 35°C, the PWM speed regulation signal can be reduced to 0% duty cycle, and then the water pump is turned off, and then the fan is turned off, and the process returns to the wake-up step; if the temperature of the battery cell is greater than the first temperature threshold of 35°C, it can be further determined whether the temperature of the battery cell is greater than or equal to the second temperature threshold of 38°C.

[0039] If the detected temperature of the battery cell is greater than or equal to the second temperature threshold of 38°C, the fan is turned on first, then the water pump is turned on, and then a PWM speed regulation signal is issued, the duty cycle of the PWM speed regulation signal is the first duty cycle of 17%, and further judge whether the temperature of the battery cell is greater than the second temperature threshold of 38°C and less than the third temperature threshold of 45°C; if the detected temperature of the battery cell is less than the second temperature threshold of 38°C, the step of waking up can be returned.

[0040] If the temperature of the battery cell is greater than the second temperature threshold of 38°C and less than the third temperature threshold of 45°C, as the temperature increases from the second temperature threshold of 38°C to the third temperature threshold of 45°C, the basic value of the PWM speed regulation signal can be controlled to increase linearly from the first duty cycle of 17% to the second duty cycle of 85%. The PWM speed regulation value is the sum of the basic value and the supplementary value, and the PWM speed regulation value is not greater than the second duty cycle of 85%.

[0041] If the temperature of the battery cell is not in the temperature range of greater than 38°C and less than 45°C, there are two cases: one is that the temperature of the battery cell is less than or equal to 38°C, then return to the wake-up step; the other is that the temperature of the battery cell is greater than or equal to 45°C, at this time the PWM speed regulation value can be directly adjusted to 85%.

[0042] After the BMS wakes up, it can continue to detect the temperature rise rate of the battery cell. When the temperature rise rate of the battery cell is detected to be in the preset range of (0.1℃ / s, 0.8℃ / s), the PWM speed regulation signal supplement value can be controlled to increase linearly from 0% to 85% as the temperature rise rate increases from 0.1℃ / s to 0.8℃ / s; if the temperature rise rate of the battery cell is greater than or equal to 0.8℃ / s, the PWM speed regulation value is directly adjusted to 85%. It is worth noting that when the temperature of the battery cell is in the range of (38℃, 45℃) and the temperature rise rate is in the range of (0.1℃ / s, 0.8℃ / s), the PWM speed regulation signal supplement value can still increase linearly to 85%. The detection of the battery cell temperature and the detection of the temperature rise rate do not conflict, and the two can work together.

[0043] It should be noted that the value of 85% is only a limitation, and the cooling efficiency will decrease if it exceeds 85%. 85% can be used as a preferred embodiment of the present application, but those skilled in the art should understand that in some embodiments, the first temperature threshold, the second temperature threshold, the third temperature threshold, the first duty cycle, and the second duty cycle can also be adjusted according to the situation, and the present application is not limited by comparison.

[0044] In summary, the present application optimizes the battery cooling device suitable for use on ships and performs variable frequency control on the water pump through a control signal, so as to adjust the operating speed of the water pump according to the working condition of the battery cluster, improve the control accuracy, and achieve energy-saving and environmental protection effects.

[0045] The present application also provides a battery cooling system, which is used for a battery cluster, wherein the battery cluster includes at least one battery pack, and the battery pack includes a power management module. The system includes the battery cooling device, and the battery management module is configured to send a drive signal to drive the at least one water pump to turn on, and send the control signal to change the operating speed of the water pump.

[0046] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0047] The battery cooling device and system provided in the embodiments of the present invention are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the technical solution and core idea of ​​the present invention. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery cooling device, characterized in that: For a battery cluster, the battery cluster includes at least one battery pack, the device includes: At least one water pump, the at least one water pump is connected in series or in parallel; the at least one water pump is configured to receive a control signal to change the operating speed of the at least one water pump; The at least one water pump is connected to the battery cluster via a cooling water pipe. Cooling water is arranged in the cooling water pipe. The cooling water flows along the cooling water pipe to the battery cluster.

2. The battery cooling device according to claim 1, characterized in that: The device also includes at least one check valve; When the at least one water pump is connected in parallel, each of the at least one check valve is connected to each of the at least one water pump in a one-to-one correspondence, and each of the check valves is arranged at the water outlet of each of the water pumps.

3. The battery cooling device according to claim 1, characterized in that: The device also includes a plurality of stop valves, and a stop valve is arranged at the water inlet or the water outlet of each water pump.

4. The battery cooling device according to claim 1, characterized in that: The device further includes an expansion water tank, which is respectively connected to the battery cluster and each of the water pumps, and is configured to store cooling water.

5. The battery cooling device according to claim 4, characterized in that: The device also includes a discharge valve and a deflation valve. The discharge valve is arranged on a side of a cooling water pipe connected to the battery cluster close to a water pump outlet, and the deflation valve is arranged on a side of a cooling water pipe connected to the battery cluster close to an expansion water tank.

6. The battery cooling device according to claim 1, characterized in that: The device also includes a heat exchanger; When the at least one water pump is connected in parallel, the input end of the heat exchanger is connected to the water outlet of the at least one water pump, and the output end of the heat exchanger is connected to the battery cluster; When the at least one water pump is connected in series, the heat exchanger is connected in series between any two of the at least one water pump.

7. The battery cooling device according to claim 4, characterized in that: The device further comprises a liquid level meter and a liquid level switch, wherein the liquid level meter and the liquid level switch are arranged in the expansion water tank, and the liquid level meter is connected to the liquid level switch; The liquid level meter is configured to monitor the water level in the expansion water tank, and the liquid level switch is configured to send out a first alarm signal when the water level in the expansion water tank is lower than a preset value.

8. The battery cooling device according to claim 6, characterized in that: The device further comprises at least one fan, and the at least one fan is connected to the heat exchanger to increase the heat dissipation efficiency of the heat exchanger.

9. The battery cooling device according to claim 6, characterized in that: The device also includes a temperature sensor, which is respectively connected to the input end and the output end of the heat exchanger, and is configured to respectively monitor the temperature of the cooling water input to the input end of the heat exchanger and the temperature of the cooling water output from the output end of the heat exchanger.

10. A battery cooling system, characterized in that: Used for a battery cluster, the battery cluster includes at least one battery pack, the battery pack includes a battery management module, the system includes a battery cooling device as described in any one of claims 1-9, and the battery management module is configured to send a drive signal to drive the at least one water pump to start, and send a control signal to change the operating speed of the water pump.

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