Battery pack and electric device

Abstract

This utility model relates to the field of power battery technology and provides a battery pack and an electrical device. The battery pack of this utility model includes a housing, a main inlet pipe and a main outlet pipe for coolant flow on the housing, multiple liquid cooling plates arranged at intervals from bottom to top within the housing, and a battery module disposed between adjacent liquid cooling plates. Each outlet of the multiple liquid cooling plates has a branch outlet pipe, and each branch outlet pipe is connected to the main outlet pipe. Each inlet of the multiple liquid cooling plates has a branch inlet pipe, and each branch inlet pipe is connected to the main inlet pipe through a flow distribution unit used to regulate the flow rate of coolant in each branch inlet pipe. This utility model's battery pack can distribute the flow rate of each branch inlet pipe according to the cooling status of each liquid cooling plate, ensuring that each liquid cooling plate maintains optimal operating conditions, thereby improving the cooling effect of the battery module and enhancing overall thermal management efficiency.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to a battery pack. This utility model also relates to an electrical device equipped with the aforementioned battery pack. Background Technology

[0002] Currently, battery packs generally use a single liquid cooling plate for cooling, but the cooling effect of the liquid cooling plate is limited and cannot meet the cooling requirements of fast charging. Even in a few battery pack structures that use multiple liquid cooling plates in series, this structure increases the flow channel length of the liquid cooling plate, increasing flow resistance and affecting the cooling effect. Furthermore, in a structure with multiple liquid cooling plates in series, if one liquid cooling plate becomes clogged and fails, it will simultaneously affect the operation of the other liquid cooling plates, thus affecting the overall cooling effect of the battery pack. Moreover, the coolant temperature varies within each liquid cooling plate, with the coolant temperature in the liquid cooling plate farther from the inlet being higher, which is not conducive to uniform heat dissipation of the battery module. In addition, the flow rate of the coolant in each liquid cooling plate cannot be adjusted individually. Utility Model Content

[0003] In view of this, the present invention aims to provide a battery pack that can adjust the flow rate of coolant in each liquid cooling plate, thereby improving the cooling effect of the battery module.

[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0005] A battery pack includes a housing, a main inlet pipe and a main outlet pipe for coolant flow on the housing, a plurality of liquid cooling plates arranged at intervals along the height direction of the housing inside the housing, and a battery module disposed between two adjacent liquid cooling plates.

[0006] Each of the multiple liquid cooling plates has a branch liquid outlet pipe at its outlet, and each branch liquid outlet pipe is connected to the main liquid outlet pipe. Each of the multiple liquid cooling plates has a branch liquid inlet pipe at its inlet, and each branch liquid inlet pipe is connected to the main liquid inlet pipe through a flow distribution unit. The flow distribution unit is used to adjust the flow rate of the coolant in each branch liquid inlet pipe.

[0007] Furthermore, each of the branch outlet pipes is connected in series with a first check valve, and each first check valve is used to unilaterally guide the corresponding branch outlet pipe in the coolant discharge direction.

[0008] Furthermore, a second check valve is connected in series on the main outlet pipe, and the second check valve is used to unilaterally guide the main outlet pipe in the direction of coolant discharge.

[0009] Furthermore, the plurality of liquid cooling plates include a top liquid cooling plate, a plurality of middle liquid cooling plates, and a bottom liquid cooling plate arranged at intervals; the top liquid cooling plate has a first flat plate and a first flow channel plate fastened to the first flat plate, the first flat plate being connected to the top layer of the battery module; and / or, the middle liquid cooling plate has a second flat plate and a third flat plate arranged opposite to each other, and a second flow channel plate sandwiched between the first flat plate and the second flat plate, the second flat plate and the third flat plate being respectively connected to two adjacent battery modules; and / or, the bottom liquid cooling plate has a fourth flat plate and a third flow channel plate fastened to the fourth flat plate, the fourth flat plate being connected to the bottom layer of the battery module.

[0010] Furthermore, the inlets and outlets on each of the liquid cooling plates are arranged on the same side of the battery module, and the inlets and outlets of the top liquid cooling plate are close together and arranged at one end of the same side of the battery module, the inlets and outlets of the middle liquid cooling plate are located at both ends of the same side of the battery module, and the inlets and outlets of the bottom liquid cooling plate are close together and arranged at the other end of the same side of the battery module.

[0011] Furthermore, the flow distribution unit includes a flow distribution valve that is connected to both the main inlet pipeline and each of the branch inlet pipelines.

[0012] Furthermore, each of the branch outlet pipes is equipped with a temperature detection device, which is used to detect the temperature of the coolant in each branch outlet pipe.

[0013] Compared with the prior art, this utility model has the following advantages:

[0014] The battery pack described in this utility model arranges multiple liquid cooling plates between multiple stacked battery modules, and connects each branch liquid inlet pipe to the main liquid inlet pipe through a flow distribution unit. This allows the flow rate of each branch liquid inlet pipe to be distributed according to the cooling status of each liquid cooling plate. When the cooling effect of one or more liquid cooling plates is insufficient or excessive, the flow rate of the coolant in the corresponding branch liquid inlet pipe can be increased or decreased by adjusting the opening of the flow distribution unit. This achieves dynamic distribution of the cooling capacity of each liquid cooling plate, ensuring that each liquid cooling plate can maintain its optimal working state, thereby improving the cooling effect of the battery module and enhancing the overall thermal management efficiency.

[0015] In addition, a first check valve is connected in series on each branch outlet pipe to effectively prevent backflow of coolant in each branch outlet pipe and ensure unidirectional flow of coolant in each liquid cooling plate. A second check valve is connected in series on the main outlet pipe to effectively prevent backflow of coolant in the main outlet pipe.

[0016] Secondly, a top liquid cooling plate, several middle liquid cooling plates, and a bottom liquid cooling plate are arranged at intervals, so that the first flat plate of the top liquid cooling plate is connected to the battery module. This increases the contact area between the top liquid cooling plate and the battery module, thereby improving the connection strength between the top liquid cooling plate and the battery module and enhancing the cooling effect on the top battery module.

[0017] The central liquid cooling plate has a second plate and a third plate arranged opposite to each other, and a second flow channel plate sandwiched between the second plate and the third plate. The second plate and the third plate are respectively connected to two adjacent battery modules. This can increase the contact area between the central liquid cooling plate and the two adjacent battery modules, improve the connection strength between the central liquid cooling plate and the battery module in the middle position, and enhance the cooling effect on the battery module in the middle position.

[0018] The bottom liquid cooling plate is designed with a fourth flat plate and a third flow channel plate that is fastened to the fourth flat plate. This connects the fourth flat plate to the bottom battery module, increasing the contact area between the bottom liquid cooling plate and the bottom battery module, improving the connection strength, and enhancing the cooling effect on the bottom battery module. Simultaneously, the cooperation of the top, middle, and bottom liquid cooling plates also improves the overall temperature uniformity of the battery module.

[0019] Furthermore, the arrangement of the inlet and outlet positions on each liquid cooling plate facilitates the layout of the branch inlet and outlet pipes. The flow distribution unit uses a flow distribution valve, a mature technology that allows for independent adjustment of the coolant flow rate in each branch inlet pipe based on the actual conditions of the battery module, enabling dynamic distribution of the cooling capacity of each liquid cooling plate. The inclusion of a temperature detection device facilitates real-time monitoring of the temperature at the outlet of each liquid cooling plate, providing a basis for closed-loop control of the flow distribution unit and thus enabling intelligent dynamic adjustment of the cooling system.

[0020] Another objective of this invention is to provide an electrical device that includes a battery pack as described above.

[0021] The electrical equipment of this invention, by adopting the battery pack as described above and utilizing the set flow distribution unit, can distribute the flow of each branch liquid inlet pipe according to the cooling status of each liquid cooling plate, so that each liquid cooling plate can be kept in the optimal working state, thereby improving the cooling effect of the battery module, improving the overall thermal management efficiency, and thus improving the reliability of the electrical equipment. Attached Figure Description

[0022] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0023] Figure 1 This is a front view of a portion of the structure of the battery pack described in this embodiment of the present invention;

[0024] Figure 2 This is a top view of a portion of the structure of the battery pack described in an embodiment of the present invention;

[0025] Figure 3 This is a left view of a portion of the structure of the battery pack described in this embodiment of the present invention;

[0026] Figure 4 This is a perspective view of a portion of the structure of the battery pack described in an embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the structure of the plurality of liquid cooling plates described in an embodiment of the present utility model;

[0028] Figure 6 This is a schematic diagram of the flow distribution valve described in an embodiment of the present utility model;

[0029] Figure 7 This is a schematic diagram of the first check valve described in an embodiment of the present utility model;

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Top liquid cooling plate; 2. Middle liquid cooling plate; 3. Bottom liquid cooling plate; 4. Flow distribution valve; 5. Four-way connector;

[0032] 10. Main inlet pipeline; 11. Branch inlet pipeline; 22. Branch outlet pipeline; 20. Main outlet pipeline;

[0033] 100. Battery module; 101. First plate; 102. First flow channel plate; 201. Second plate; 202. Third plate; 301. Fourth plate; 302. Third flow channel plate; 401. First interface; 402. Second interface; 403. Third interface; 404. Fourth interface; 501. Liquid inlet interface; 502. Liquid outlet interface. Detailed Implementation

[0034] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0035] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0036] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model in light of the specific circumstances.

[0038] In the description of this utility model, it should be noted that the directional terms used in this embodiment, such as "up," "down," "left," "right," "front," and "rear," are defined based on the vertical, horizontal, and longitudinal directions of the vehicle. Specifically, the vertical direction of the vehicle is its height, the longitudinal direction is its length, and the horizontal direction is its width. "Inner" and "outer" are defined based on the outline of the corresponding components. For example, the interior and exterior of the vehicle are defined based on its outline, with the side closer to the center of the vehicle being "inner" and the opposite side being "outer."

[0039] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0040] Example 1

[0041] This embodiment relates to a battery pack that can reduce the flow rate of coolant in each liquid cooling plate, thereby improving the cooling effect of the battery module.

[0042] In terms of overall structure, such as Figures 1 to 4As shown, the battery pack of this embodiment includes a housing, a main inlet pipe 10 and a main outlet pipe 20 for coolant flow provided on the housing, a plurality of liquid cooling plates arranged at intervals along the height direction of the housing inside the housing, and a battery module 100 disposed between two adjacent liquid cooling plates.

[0043] Each of the liquid cooling plates has a branch outlet pipe 22 at its outlet, and each branch outlet pipe 22 is connected to the main outlet pipe 20. Each of the liquid cooling plates has a branch inlet pipe 11 at its inlet, and each branch inlet pipe 11 is connected to the main inlet pipe 10 through a flow distribution unit. The flow distribution unit is used to adjust the flow rate of coolant in each branch inlet pipe 11.

[0044] In the above structure, multiple liquid cooling plates are arranged at intervals along the height of the box, and the battery module 100 is placed between two adjacent liquid cooling plates, so that liquid cooling plates are provided on both the upper and lower sides of each layer of battery module 100, and each branch liquid inlet pipe 11 is connected to the main liquid inlet pipe 10 through the flow distribution unit. In this way, the flow of each branch liquid inlet pipe 11 can be distributed according to the cooling status of each liquid cooling plate.

[0045] When the cooling effect of one or more liquid cooling plates is insufficient or excessive, the flow rate of the coolant in the corresponding branch liquid inlet pipe 11 can be increased or decreased by adjusting the opening of the flow distribution unit. This enables the cooling capacity of each liquid cooling plate to be dynamically distributed, so that each liquid cooling plate can be kept in the best working state, thereby improving the cooling effect of the battery module 100 and improving the overall thermal management efficiency.

[0046] Based on the above overview, for details please refer to... Figures 1 to 4 As shown, in this embodiment, the two-layer battery module 100 arranged vertically is used as an example for explanation. Specifically, the multiple liquid cooling plates include a top liquid cooling plate 1, a middle liquid cooling plate 2, and a bottom liquid cooling plate 3 arranged at intervals. A first battery module 100 is disposed between the top liquid cooling plate 1 and the middle liquid cooling plate 2, and a second battery module 100 is disposed between the middle liquid cooling plate 2 and the bottom liquid cooling plate 3. That is to say, the top liquid cooling plate 1, the first battery module 100, the middle liquid cooling plate 2, the second battery module 100, and the bottom liquid cooling plate 3 are stacked sequentially from top to bottom.

[0047] It is worth noting that, in this embodiment, the battery module 100 can be arranged in two layers, or in three, four, or other multiple layers. This embodiment does not impose any restrictions on this. In this case, when the battery module 100 is arranged in three layers, the corresponding central liquid cooling plates 2 are arranged in two spaced intervals; when the battery module 100 is arranged in four layers, the corresponding central liquid cooling plates 2 are arranged in three spaced intervals, and so on.

[0048] In this embodiment, refer to Figure 5 As shown, the top liquid cooling plate 1 has a first flat plate 101 and a first flow channel plate 102 that is fastened and connected to the first flat plate 101. The first flat plate 101 is connected to the top battery module 100. By connecting the first flat plate 101 of the top liquid cooling plate 1 to the battery module 100, the contact area between the top liquid cooling plate 1 and the battery module 100 can be increased, thereby improving the connection strength between the top liquid cooling plate 1 and the battery module 100 and enhancing the cooling effect on the top battery module 100.

[0049] The central liquid cooling plate 2 has a second plate 201 and a third plate 202 arranged opposite to each other, and a second flow channel plate sandwiched between the first plate 101 and the second plate 201. The second plate 201 and the third plate 202 are respectively connected to two adjacent battery modules 100. By arranging the second plate 201 and the third plate 202 of the central liquid cooling plate 2 to be connected to two adjacent battery modules 100, the contact area between the central liquid cooling plate 2 and the two adjacent battery modules 100 can be increased, the connection strength between the central liquid cooling plate 2 and the battery module 100 in the middle position can be improved, and the cooling effect on the battery module 100 in the middle position can be enhanced.

[0050] The bottom liquid cooling plate 3 has a fourth flat plate 301 and a third flow channel plate 302 that is fastened and connected to the fourth flat plate 301. The fourth flat plate 301 is connected to the bottom battery module 100. By setting the bottom liquid cooling plate 3 to have a fourth flat plate 301 and a third flow channel plate 302 that is fastened and connected to the fourth flat plate 301, the fourth flat plate 301 is connected to the bottom battery module 100. This also increases the contact area between the bottom liquid cooling plate 3 and the bottom battery module 100, improves the connection strength between the bottom liquid cooling plate 3 and the bottom battery module 100, and enhances the cooling effect on the bottom battery module 100.

[0051] In specific implementation, the top liquid cooling plate 1 can preferably adopt a stamped and brazed cold plate structure, and the first plate 101 in the top liquid cooling plate 1 can be bonded to the top of the top battery module 100, for example, by means of thermally conductive structural adhesive. The middle liquid cooling plate 2 can preferably adopt an extruded profile cold plate structure, and the upper and lower second plates 201 and the third plate 202 of the middle liquid cooling plate 2 can also be bonded to two adjacent battery modules 100 respectively by means of thermally conductive structural adhesive. The bottom liquid cooling plate 3 is the same as the top liquid cooling plate 1, and can also preferably adopt a stamped and brazed cold plate structure, and the fourth plate 301 in the bottom liquid cooling plate 3 can also be bonded to the bottom of the bottom battery module 100 by means of thermally conductive structural adhesive. This use of thermally conductive structural adhesive also facilitates the heat conduction of the battery module 100. At the same time, the cooperation of the top liquid cooling plate 1, the middle liquid cooling plate 2 and the bottom liquid cooling plate 3 can further improve the overall temperature uniformity of the battery module 100.

[0052] As a further preferred embodiment, in this example, the inlets and outlets on each liquid cooling plate are arranged on the same side of the battery module 100. The inlets and outlets of the top liquid cooling plate 1 are positioned close together and located at one end of the same side of the battery module 100. The inlets and outlets of the middle liquid cooling plate 2 are located at opposite ends of the same side of the battery module 100. The inlets and outlets of the bottom liquid cooling plate 3 are positioned close together and located at the other end of the same side of the battery module 100. By limiting the positions of the inlets and outlets on each liquid cooling plate, the arrangement of the branch inlet pipes 11 and branch outlet pipes 22 is facilitated.

[0053] In this embodiment, the inlets of multiple liquid cooling plates are each provided with branch liquid inlet pipes 11. As a preferred implementation, the flow distribution unit of this embodiment includes a flow distribution valve 4 that is connected to both the main liquid inlet pipe 10 and each branch liquid inlet pipe 11. Figures 4 to 6 As shown, the flow distribution valve 4 in this embodiment has a first interface 401 connected to the main inlet pipe 10, and a second interface 402, a third interface 403, and a fourth interface 404 respectively connected to each branch inlet pipe 11. It is worth noting here that... Figure 6 The flow distribution valve 4 shown is only a schematic structure; its specific structure can be found in mature products in the prior art.

[0054] In this embodiment, by setting a flow distribution valve 4 between the main liquid inlet pipe 10 and each branch liquid inlet pipe 11, the flow rate of coolant in each branch liquid inlet pipe 11 can be independently adjusted according to the actual situation of the battery module 100, so as to dynamically distribute the cooling capacity of each liquid cooling plate.

[0055] In a preferred embodiment, a first check valve is connected in series with each branch outlet pipe 22. Each first check valve is used to unidirectionally open the corresponding branch outlet pipe 22 in the coolant discharge direction. This effectively prevents reverse flow of coolant within each branch outlet pipe 22, ensuring a stable unidirectional circulation of coolant within each liquid cooling plate. Similarly, in another preferred embodiment, a second check valve can also be connected in series with the main outlet pipe 20. This second check valve is used to unidirectionally open the main outlet pipe 20 in the coolant discharge direction. Connecting the second check valve in series with the main outlet pipe 20 effectively prevents reverse flow of coolant within the main outlet pipe 20.

[0056] It is worth noting that the first check valve can be connected in series only on each branch outlet line 22, or the second check valve can be connected in series only on the main outlet line 20. Alternatively, the first check valve can be connected in series on each branch outlet line 22, and the second check valve can be connected in series on each main outlet line 20. It is also worth noting that, based on the flow distribution valve 4 installed between the main inlet line 10 and each branch inlet line 11, and considering cost, the first check valve can also be omitted from each branch outlet line 22; this is also feasible.

[0057] In practice, the main outlet pipeline 20 and each branch outlet pipeline 22 are connected via four-way connectors 5. For example... Figure 7 As shown, the four-way connector 5 has multiple liquid inlet ports 501 and one liquid outlet port 502. The multiple liquid inlet ports 501 are respectively connected to multiple branch liquid outlet pipes 22, and the liquid outlet port 502 is connected to the main liquid outlet pipe 20.

[0058] In addition, as a preferred embodiment, each branch outlet pipe 22 is equipped with a temperature detection device to detect the temperature of the coolant in each branch outlet pipe 22. This temperature detection device facilitates real-time monitoring of the temperature at the outlet of each liquid cooling plate, enabling the determination of which branch inlet pipe requires coolant flow adjustment. This provides a basis for closed-loop control of the flow distribution unit, thereby facilitating intelligent dynamic adjustment of the cooling system.

[0059] The battery pack in this embodiment uses multiple battery modules 100 stacked vertically, a top liquid cooling plate 1, several middle liquid cooling plates 2, and a bottom liquid cooling plate 3. The inlets of the top liquid cooling plate 1, several middle liquid cooling plates 2, and the bottom liquid cooling plate 3 are connected in parallel to the main liquid inlet pipeline 10, and the outlets of the top liquid cooling plate 1, several middle liquid cooling plates 2, and the bottom liquid cooling plate 3 are connected in parallel to the main liquid outlet pipeline 20. This solves the problems of high flow resistance, low flow rate, and high failure risk in the traditional structure of multiple liquid cooling plates in series.

[0060] Meanwhile, the flow distribution unit can allocate the flow rate of each branch inlet pipe 11 according to the cooling status of each liquid cooling plate. When the cooling effect of one or more liquid cooling plates is insufficient or excessive, the flow rate of the coolant in the corresponding branch inlet pipe 11 can be increased or decreased, thereby realizing the dynamic allocation of the cooling capacity of each liquid cooling plate. This ensures that each liquid cooling plate can maintain its optimal working state, thereby improving the cooling effect of the battery module 100, enhancing the overall thermal management efficiency, and achieving excellent performance.

[0061] Example 2

[0062] This embodiment relates to an electrical device, which includes a battery pack as described in Embodiment 1.

[0063] It is worth noting that the electrical device in this embodiment can be a vehicle, portable device, ship, spacecraft, or electric toy, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Portable devices can be, for example, unmanned logistics vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. This embodiment does not impose any special limitations on the aforementioned electrical devices.

[0064] The electrical device of this embodiment, by employing the battery pack of Embodiment 1 and utilizing the provided flow distribution unit, can distribute the flow rate of each branch liquid inlet pipe 11 according to the cooling status of each liquid cooling plate, so that each liquid cooling plate can maintain optimal working condition, thereby improving the cooling effect of the battery module 100, enhancing the overall thermal management efficiency, and thus improving the reliability of the electrical device. The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery pack, characterized in that: It includes a housing, a main inlet pipe (10) and a main outlet pipe (20) for coolant flow provided on the housing, a plurality of liquid cooling plates arranged at intervals along the height direction of the housing and disposed in the housing, and a battery module (100) disposed between two adjacent liquid cooling plates. Each of the multiple liquid cooling plates has a branch liquid outlet pipe (22) at its outlet, and each branch liquid outlet pipe (22) is connected to the main liquid outlet pipe (20). Each of the multiple liquid cooling plates has a branch liquid inlet pipe (11) at its inlet, and each branch liquid inlet pipe (11) is connected to the main liquid inlet pipe (10) through a flow distribution unit. The flow distribution unit is used to adjust the flow rate of the coolant in each branch liquid inlet pipe (11).

2. The battery pack according to claim 1, characterized in that: Each of the branch outlet pipes (22) is connected in series with a first check valve, and each first check valve is used to unilaterally guide the corresponding branch outlet pipe (22) in the direction of coolant discharge.

3. The battery pack according to claim 1, characterized in that: A second check valve is connected in series on the main outlet pipe (20). The second check valve is used to unilaterally guide the main outlet pipe (20) in the direction of coolant discharge.

4. The battery pack according to claim 1, characterized in that: The plurality of liquid cooling plates include a top liquid cooling plate (1) arranged at intervals, a plurality of middle liquid cooling plates (2) and a bottom liquid cooling plate (3); The top liquid cooling plate (1) has a first flat plate (101) and a first flow channel plate (102) that is fastened and connected to the first flat plate (101). The first flat plate (101) is connected to the battery module (100) at the top layer; and / or, The central liquid cooling plate (2) has a second plate (201) and a third plate (202) arranged opposite to each other, and a second flow channel plate sandwiched between the first plate (101) and the second plate (201). The second plate (201) and the third plate (202) are respectively connected to two adjacent battery modules (100); and / or, The bottom liquid cooling plate (3) has a fourth plate (301) and a third flow channel plate (302) that is fastened and connected to the fourth plate (301). The fourth plate (301) is connected to the battery module (100) at the bottom.

5. The battery pack according to claim 4, characterized in that: The inlet and outlet of each of the liquid cooling plates are arranged on the same side of the battery module (100), and the inlet and outlet of the top liquid cooling plate (1) are arranged close to each other and at one end of the same side of the battery module (100). The inlet and outlet of the middle liquid cooling plate (2) are located at both ends of the same side of the battery module (100), and the inlet and outlet of the bottom liquid cooling plate (3) are arranged close to each other and at the other end of the same side of the battery module (100).

6. The battery pack according to claim 1, characterized in that: The flow distribution unit includes a flow distribution valve (4) that is connected to both the main inlet pipe (10) and each of the branch inlet pipes (11).

7. The battery pack according to any one of claims 1 to 6, characterized in that: Each of the branch outlet pipes (22) is equipped with a temperature detection device, which is used to detect the temperature of the coolant in each branch outlet pipe (22).

8. An electrical device, characterized in that: The electrical device is provided with a battery pack as described in any one of claims 1 to 7.

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