Battery pack and electric device

Abstract

The utility model relates to a battery pack and an electric device, and the battery pack comprises a box body which comprises two opposite open ends; the bottom layer liquid cooling plate is connected with the box body so as to seal one of the opening ends; the at least two battery cell layers are sequentially stacked in the box body and are positioned on one side, close to the box body, of the bottom-layer liquid cooling plate; the middle-layer liquid cooling plate is arranged between every two adjacent battery cell layers; the top-layer liquid cooling plate is connected with the box body so as to seal the other opening end, and is positioned on one side, far away from the middle-layer liquid cooling plate, of the uppermost-layer battery cell layer; wherein the bottom-layer liquid cooling plate, the middle-layer liquid cooling plate and the top-layer liquid cooling plate are respectively used for exchanging heat with the adjacent battery core layers. And each battery cell layer is cooled by the adjacent upper and lower liquid cooling plates, so that the heat dissipation effect of each battery cell layer is ensured, the heat spreading is reduced, and the safety performance of the battery pack is improved.

Description

Technical Field

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

[0002] With the rapid expansion and development of the new energy market, the market share of new energy vehicles is gradually increasing. As a result, the application of power batteries, the core component of new energy vehicles, is becoming increasingly widespread in people's lives.

[0003] Traditional batteries cool the cells inside the casing by bottom cooling, which results in poor cooling effect, low heat dissipation efficiency, and significant safety hazards. Utility Model Content

[0004] Therefore, it is necessary to provide a battery pack and power device that can improve heat dissipation efficiency to address the problem of low heat dissipation efficiency of traditional batteries.

[0005] On one hand, this application provides a battery pack, including:

[0006] The enclosure includes two opposing open ends;

[0007] A bottom liquid cooling plate is connected to the housing to seal one of the opening ends;

[0008] A battery cell layer, at least two battery cell layers are stacked sequentially inside the housing and located on the side of the bottom liquid cooling plate close to the housing;

[0009] A middle liquid cooling plate is provided between every two adjacent battery cell layers;

[0010] The top liquid cooling plate is connected to the housing to close the other opening end, and is located on the side of the uppermost cell layer away from the middle liquid cooling plate;

[0011] The bottom liquid cooling plate, the middle liquid cooling plate, and the top liquid cooling plate are used for heat exchange with the adjacent battery cell layers.

[0012] In one embodiment, the bottom liquid cooling plate is the bottom plate of the battery pack; the top liquid cooling plate is the top cover of the battery pack.

[0013] In one embodiment, the battery pack further includes an inlet pipe and an outlet pipe disposed within the housing;

[0014] The bottom liquid cooling plate, the middle liquid cooling plate and the top liquid cooling plate each have a liquid inlet and a liquid outlet, and the multiple liquid inlets are connected to the liquid inlet pipeline and the multiple liquid outlets are connected to the liquid outlet pipeline.

[0015] The inlet pipe and the outlet pipe pass through the housing to connect with the liquid supply system.

[0016] In one embodiment, the battery pack further includes multiple layers of thermally conductive adhesive, the bottommost cell layer is bonded and fixed to the bottom liquid cooling plate through the thermally conductive adhesive layer, at least one cell layer is bonded and fixed to its adjacent middle liquid cooling plate through the thermally conductive adhesive layer, and the topmost cell layer is bonded and fixed to the top liquid cooling plate through the thermally conductive adhesive layer.

[0017] In one embodiment, the housing has a cell mounting area and an electrical mounting area that are independent of each other, and the cell layers are stacked sequentially from top to bottom in the cell mounting area;

[0018] The top liquid cooling plate includes a liquid cooling body and a maintenance cover. The liquid cooling body is fixedly connected to the housing. The liquid cooling body has a maintenance port located opposite the electrical installation area, and the maintenance cover is placed over the maintenance port.

[0019] In one embodiment, each cell layer includes multiple rows of cell groups arranged along a first direction, and each row of cell groups includes multiple cells arranged sequentially along a second direction; the first direction is the width direction of the housing, and the second direction is the length direction of the housing;

[0020] The two adjacent rows of battery cells have a first end facing each other along the first direction and a second end facing away from each other. The first end of the two adjacent rows of battery cells is provided with one of a pole post and an explosion-proof valve, and the second end is provided with the other of the pole post and the explosion-proof valve.

[0021] The battery pack also includes an electrical connector, which is disposed in the assembly gap formed by two adjacent rows of battery cells and / or the assembly gap formed by the battery cells and the side wall of the housing, and is electrically connected to the terminal post.

[0022] In one embodiment, each cell layer includes multiple rows of cell groups arranged along a first direction, and each row of cell groups includes multiple cells arranged sequentially along a second direction; the first direction is the width direction of the housing, and the second direction is the length direction of the housing;

[0023] The battery pack also includes a protective component, which is disposed between two rows of the battery cells in the cell layer and / or between the battery cells and the housing, to prevent gas ejected through the explosion-proof valve of the battery cells from spraying toward adjacent rows of the battery cells and / or the housing.

[0024] In one embodiment, the protective component includes a protective part and an air guide part, the air guide part being connected to the protective part, the air guide part and the protective part together forming an air guide channel, and the air guide part having a through hole;

[0025] Each of the through holes is opposite to one of the explosion-proof valves, and the through holes are connected to the gas guide channel.

[0026] In one embodiment, the protective component is disposed between two adjacent rows of battery cells. The protective component includes two air guides, each of which forms an air guide channel with the protective component. The protective component is disposed between the two air guide channels. The air guides are L-shaped, and the two air guides are connected to form a U-shaped structure. The protective component is disposed within the U-shaped structure, making the protective component an E-shaped structure.

[0027] and / or

[0028] The protective component is disposed between the battery cell assembly and the housing. The protective component includes a venting section, which has an L-shaped structure. The protective component is connected to the venting section, making the protective component U-shaped.

[0029] On the other hand, this application also provides an electrical device including the aforementioned battery pack.

[0030] Compared with the prior art, this application has the following beneficial effects:

[0031] Each cell layer can exchange heat with its adjacent upper and lower liquid cooling plates, ensuring effective heat dissipation, reducing heat spread, and improving the battery pack's safety performance. Simultaneously, since the bottom and top liquid cooling plates can respectively seal the two openings of the casing, their areas are no smaller than the opening areas of the casing. The relatively large areas of the bottom and top liquid cooling plates further enhance the cooling effect on the bottom and top cell layers, thereby further improving battery safety performance. Attached Figure Description

[0032] Figure 1 This is a structural diagram of a battery pack provided in one embodiment of this application;

[0033] Figure 2 for Figure 1 An exploded view of the battery pack shown;

[0034] Figure 3 for Figure 1 The diagram shows a structural view of the battery pack from another perspective.

[0035] Figure 4 for Figure 1The diagram shows the structure of the battery pack's hidden maintenance cover.

[0036] Figure 5 for Figure 1 The diagram shows the structure of the battery pack with the top liquid cooling plate hidden.

[0037] Figure 6 for Figure 5 A structural diagram of the structure shown from another perspective;

[0038] Figure 7 for Figure 1 An exploded view of a portion of the battery pack structure shown.

[0039] Figure 8 for Figure 1 The diagram shows the structure of the top liquid cooling plate of the battery pack.

[0040] Figure 9 for Figure 5 Exploded view of the structure shown;

[0041] Figure 10 This is a structural diagram of a protective component for a battery pack provided in one embodiment of this application;

[0042] Figure 11 This is a structural diagram of the protective component of a battery pack provided in another embodiment of this application.

[0043] Explanation of reference numerals in the attached figures:

[0044] 100. Battery pack; 10. Housing; 11. Bottom liquid cooling plate; 12. Cell mounting area; 13. Electrical mounting area; 20. Cell layer; 21. Cell; 211. Terminal; 212. Explosion-proof valve; 22. Cell assembly; 30. Middle liquid cooling plate; 40. Top liquid cooling plate; 41. Liquid cooling body; 411. Maintenance port; 42. Maintenance cover; 43. Second sealing gasket; 50. Liquid inlet pipe; 60. Liquid outlet pipe; 70. Thermally conductive adhesive layer; 80. Assembly gap; 90. Electrical connector; 110. Protective component; 101. Protective part; 102. Gas guide part; 103. Gas guide channel; 104. Through hole; 120. Liquid inlet; 130. Liquid outlet; 140. First sealing gasket; X, First direction; Y, Second direction. Detailed Implementation

[0045] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0046] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship 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 are not intended to 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.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0048] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0049] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0050] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0051] See Figure 1 and Figure 2 One embodiment of this application provides a battery pack 100, including a housing 10, which has two opposing open ends. Specifically, the housing 10 is a hollow cuboid structure, and the housing 10 has an opening in the height direction ( Figure 2 The two ends in the Z direction are respectively formed as described above.

[0052] The battery pack 100 also includes a bottom liquid cooling plate 11 and cell layers 20. The bottom liquid cooling plate 11 is connected to the housing 10 to close one of the open ends. At least two cell layers 20 are arranged along the height direction of the housing 10. Figure 2 The cells are stacked sequentially in the Z-direction within the housing 10, and are located on the side of the bottom liquid cooling plate 11 closest to the housing 10. Because the cell layers 20 are stacked in the height direction within the housing 10, the space utilization of the battery pack 100 is improved.

[0053] It should be noted that "at least two cell layers 20 are located on the side of the bottom liquid cooling plate 11 closest to the casing 10" means that at least two cell layers 21 are located on the inner side of the bottom liquid cooling plate 11, which is the side of the battery pack 100 that is not exposed to the outside after assembly. In other words, the bottom liquid cooling plate 11 is located on the side of the bottommost cell layer 20 away from the middle liquid cooling plate 30.

[0054] Continue reading Figure 2 The battery pack 100 also includes a middle liquid cooling plate 30 and a top liquid cooling plate 40. A middle liquid cooling plate 30 is provided between every two adjacent cell layers 20, thus the number of middle liquid cooling plates 30 is one less than the number of cell layers 20. In some embodiments, the battery pack 100 has two cell layers 20, in which case the battery pack 100 has one middle liquid cooling plate 30. In other embodiments, the battery pack 100 has three cell layers 20, in which case the battery pack 100 has two middle liquid cooling plates 30. The top liquid cooling plate 40 is connected to the housing 10 to close another opening end and is located on the side of the uppermost cell layer 20 away from the middle liquid cooling plate 30.

[0055] The bottom liquid cooling plate 11, the middle liquid cooling plate 30, and the top liquid cooling plate 40 are used for heat exchange with their adjacent cell layers 20. In this way, each cell layer 20 can exchange heat with its adjacent upper and lower liquid cooling plates. For example, the bottom cell layer 20 can exchange heat with the bottom liquid cooling plate 11 and its adjacent middle liquid cooling plate 30, and the top cell layer 20 can exchange heat with the top liquid cooling plate 40 and its adjacent middle liquid cooling plate 30.

[0056] The battery pack 100 provided in this application embodiment allows each cell layer 20 to exchange heat with its adjacent upper and lower liquid cooling plates, ensuring the heat dissipation effect of each cell layer 20, reducing heat spread, and improving the safety performance of the battery pack 100. Simultaneously, since the bottom liquid cooling plate 11 and the top liquid cooling plate 40 can respectively close the two openings of the housing 10, it can be seen that the area of ​​the bottom liquid cooling plate 11 and the top liquid cooling plate 40 is not less than the area of ​​the openings of the housing 10. The relatively large area of ​​the bottom liquid cooling plate 11 and the top liquid cooling plate 40 further improves the cooling effect on the bottommost and topmost cell layers 20, thereby further improving the battery's safety performance.

[0057] It should also be noted that the bottom liquid cooling plate 11 and the middle liquid cooling plate 30 also serve to support the battery cell 21, thereby improving the structural strength of the battery pack 100.

[0058] In some embodiments, see Figure 3 The bottom liquid cooling plate 11 serves as the base plate of the battery pack 100. With this configuration, the bottom liquid cooling plate 11 not only has a cooling function but also protects the cell layer 20. Compared to using a separate base plate, this reduces the space occupied by the battery pack 100 in the height direction.

[0059] Continue reading Figure 2 The battery pack 100 also includes multiple layers of thermally conductive adhesive 70. The bottommost cell layer 20 is bonded and fixed to the bottom liquid cooling plate 11 through the thermally conductive adhesive 70. At least one cell layer 20 is bonded and fixed to its adjacent middle liquid cooling plate 30 through the thermally conductive adhesive 70. The topmost cell layer 20 is bonded and fixed to the top liquid cooling plate 40 through the thermally conductive adhesive 70. On the one hand, the thermally conductive adhesive 70 can conduct heat, facilitating heat exchange between the liquid cooling plate and the cell layer 20; on the other hand, the bonding and fixing of the cell layer 20 to the corresponding liquid cooling plate through the thermally conductive adhesive 70 improves the structural strength of the battery pack 100.

[0060] In some specific embodiments, all cell layers 20 are bonded and fixed to their adjacent intermediate liquid cooling plates 30 via thermally conductive adhesive layers 70 to further improve the structural strength of the battery pack 100. Of course, in other embodiments, some cell layers 20 may also be bonded and fixed to their adjacent intermediate liquid cooling plates 30 via thermally conductive adhesive layers 70, which is not limited here.

[0061] Further reading Figure 4 The top liquid cooling plate 40 serves as the top cover of the battery pack 100, and a first sealing gasket 140 is provided between the top liquid cooling plate 40 and the housing 10 to ensure sealing performance. With this configuration, the top liquid cooling plate 40 not only has a cooling function but also protects the cell layer 20. Compared to having a separate top cover, this reduces the space occupied by the battery pack 100 in the height direction.

[0062] Continue reading Figure 2 And see Figure 5 The housing 10 has independent cell mounting area 12 and electrical mounting area 13. Cell layers 20 are stacked sequentially from top to bottom in cell mounting area 12. The cell mounting area 12 and electrical mounting area 13 are independently configured, ensuring that the installation of the cell layers 20 and the electrical installation do not interfere with each other. (Continue reading...) Figure 2 and Figure 4 The top liquid cooling plate 40 includes a liquid cooling body 41 and a maintenance cover 42. The liquid cooling body 41 is fixedly connected to the housing 10. A maintenance port 411 is provided on the liquid cooling body 41 facing the electrical installation area 13, and the maintenance cover 42 is placed over the maintenance port 411. The maintenance port 411 is provided on the liquid cooling body 41 facing the electrical installation area 13 to facilitate electrical maintenance of the electrical installation area 13.

[0063] Specifically, the maintenance cover 42 is connected to the liquid cooling body 41 by fixing screws to facilitate the installation and removal of the maintenance cover 42. In order to ensure the sealing effect, a second sealing gasket 43 is provided between the maintenance cover 42 and the liquid cooling body 41.

[0064] Further reading Figure 5 and Figure 6 The battery pack 100 also includes an inlet pipe 50 and a drain pipe 60 located within the housing 10. Optionally, portions of the inlet pipe 50 and the drain pipe 60 are located in the electrical installation area 13. When the maintenance port 411 is open, the inlet pipe 50 and the drain pipe 60 can be observed through the maintenance port 411, reducing the occurrence of leakage. This also provides installation and operation space for the inlet pipe 50 and the drain pipe 60. (See reference...) Figure 7 and Figure 8 The bottom liquid cooling plate 11, the middle liquid cooling plate 30, and the top liquid cooling plate 40 are all provided with liquid inlets 120 for inlet and liquid outlets 130 for outlet. Multiple liquid inlets 120 are connected to liquid inlet pipes 50, and multiple liquid outlets 130 are connected to liquid outlet pipes 60. The liquid inlet pipes 50 and 60 pass through the housing 10 to connect with an external liquid supply system. This facilitates the inlet and outlet of liquid in the bottom liquid cooling plate 11, the middle liquid cooling plate 30, and the top liquid cooling plate 40.

[0065] Generally, the electrical installation area 13 is located at the end of the housing 10 along its length. When parts of the liquid inlet pipe 50 and the liquid outlet pipe 60 are located in the electrical installation area 13, in order to reduce the length of the liquid inlet pipe 50 and the liquid outlet pipe 60, the liquid inlet 120 and the liquid outlet 130 of each liquid cooling plate are located at the end closest to the electrical installation area 13.

[0066] In some embodiments, see Figure 5 and Figure 9 Each cell layer 20 includes multiple rows of cell groups 22 arranged along a first direction X, and each row of cell groups 22 includes multiple cells 21 arranged sequentially along a second direction Y. The first direction X is the width direction of the housing 10, and the second direction Y is the length direction of the housing 10. Adjacent rows of cell groups 22 have a first end facing each other along the first direction X and a second end facing away from each other; that is, each row of cell groups 22 has a first end and a second end arranged opposite each other along the first direction X, with the first ends of adjacent rows of cell groups 22 facing each other and the second ends facing away from each other. The first end of adjacent rows of cell groups 22 is simultaneously provided with one of a terminal post 211 and an explosion-proof valve 212, and the second end is simultaneously provided with the other of a terminal post 211 and an explosion-proof valve 212. The battery pack 100 also includes an electrical connector 90, which is disposed within an assembly gap 80 formed by two adjacent rows of battery cells 22 and / or within an assembly gap 80 formed by the battery cells 22 and the side wall of the housing 10, and is electrically connected to the terminal post 211. Specifically, an assembly gap 80 is formed between the ends of two adjacent rows of battery cells 22 that do not have an explosion-proof valve 212 and / or between the end of the battery cells 22 that does not have an explosion-proof valve 212 and the side wall of the housing 10, so that the electrical connector 90 located in the assembly gap 80 can be separated from the explosion-proof valve 212, thereby improving the safety performance of the battery pack 100. The electrical connector 90 is used to realize the electrical connection between the battery cells 21.

[0067] The above arrangement, with the first ends of adjacent rows of battery cell groups 22 facing each other and the second ends facing away from each other, ensures that the pole post 211 and the explosion-proof valve 212 are located at non-adjacent ends of each pair of adjacent rows of battery cell groups 22. This minimizes the impact on adjacent rows of battery cell groups 22 in the event of thermal runaway of a battery cell 21. Furthermore, the assembly gap 80 formed between adjacent rows of battery cell groups 22 and / or between the battery cell group 22 and the side wall of the housing 10 facilitates the assembly of the electrical connectors 90.

[0068] Optionally, the battery cell 21 has a cuboid structure, with its length direction being the width direction of the housing 10, its width direction being the length direction of the housing 10, and its height direction being parallel to the height direction of the housing 10. The terminals 211 and the explosion-proof valve 212 are located at both ends along the length of the battery cell 21, with the positive and negative terminals 211 of the battery cell 21 located at the same end. The length, width, and height of the battery cells 21 decrease sequentially, and the cells 21 are stacked along the height direction, which reduces the size of the battery pack 100 in the height direction. Simultaneously, the large surface of the battery cell 21 exchanges heat with the liquid cooling plate, improving the cooling effect of the liquid cooling plate on the battery cell 21.

[0069] In some embodiments, see further reference. Figure 9 The battery pack 100 also includes a protective component 110. The protective component 110 is disposed between two rows of cell groups 22 in the cell layer 20 and / or between the cell group 22 and the housing 10, to prevent the gas ejected from the explosion-proof valve 212 of the cell group 22 from spraying toward the adjacent row of cell groups 22 and / or the housing 10. That is, the protective component 110 is disposed at the end of the cell group 22 where the explosion-proof valve 212 is located, to prevent the gas ejected from the explosion-proof valve 212 from spraying toward the adjacent row of cell groups 22 and / or the housing 10. It can be seen that the setting of the protective component 110 can prevent the heat from spreading to the adjacent cell group 22 and / or the housing 10 when the cell 21 thermally runs away, thereby improving the safety performance of the battery pack 100.

[0070] Furthermore, the protective component 110 includes a protective section 101 and a venting section 102. The venting section 102 is connected to the protective section 101, and together they form a venting channel 103. The venting section 102 has through holes 104. Each through hole 104 is opposite to an explosion-proof valve 212 and communicates with the venting channel 103. The venting channel 103 extends along the second direction Y. Thus, when thermal runaway occurs in the battery cell 21, the gas ejected through the explosion-proof valve 212 enters the venting channel 103 through the through holes 104, and is guided to the outside for discharge through the venting channel 103, reducing the occurrence of heat propagation.

[0071] For some specific implementation methods, see [link / reference]. Figure 10The protective component 110 is disposed between two adjacent rows of battery cell groups 22. The protective component 110 includes two venting sections 102, each of which forms a venting channel 103 with the protective component 101. The protective component 101 is disposed between the two venting channels 103. The venting sections 102 have an L-shaped structure, and the two venting sections 102 are connected to form a U-shaped structure. The protective component 101 is disposed within the U-shaped structure, making the protective component 101 have an E-shaped structure. With this arrangement, the two venting sections 102 of the protective component 110 are respectively located close to the two adjacent rows of battery cell groups 22. When a cell 21 in one of the two adjacent rows of battery cell groups 22 experiences thermal runaway, the heat is discharged through the through-hole 104 of the corresponding protective component 101 into the corresponding venting channel 103, reducing the impact of thermal runaway of one row of battery cell groups 22 on the adjacent rows.

[0072] For other specific implementations, see [link to relevant documentation]. Figure 11 The protective component 110 is located between the battery cell assembly 22 and the housing 10. The protective component 110 includes a venting section 102, which has an L-shaped structure. The protective component 101 is connected to the venting section 102, making the protective component 110 have a U-shaped structure. With this arrangement, one of the venting sections 102 of the protective component 110 is located close to the battery cell assembly 22 adjacent to the housing 10. When the battery cell assembly 22 experiences thermal runaway, the venting is discharged through the through hole 104 of the protective component 101 into the venting channel 103, reducing the impact of thermal runaway of the battery cell assembly 22 on the housing 10.

[0073] It is conceivable that in some specific embodiments, the U-shaped protective member 110 can be placed between two adjacent rows of battery cells 22, or the E-shaped protective member 110 can be placed between the battery cell group 22 and the housing 10. In other specific embodiments, the protective member 110 can also be set in other ways, such as setting the protective member 110 to only include the protective part 101 and omitting the air guide part 102, as long as the protective member 110 can achieve the protective effect.

[0074] Another embodiment of this application provides an electrical device including the battery pack 100 described above. Since the battery pack 100 has beneficial effects, the electrical device including the battery pack 100 has the same beneficial effects, which will not be described in detail here.

[0075] Optionally, the electrical device is a vehicle, which can be a gasoline vehicle, a natural gas vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended vehicles, etc.

[0076] It is worth noting that, for pure electric vehicles, the aforementioned batteries can serve as a driving power source, thereby replacing fossil fuels to provide driving power.

[0077] In other embodiments, the type of electrical device is not limited. For example, the electrical device can also be a ship, spacecraft, electric toy, power tool, energy storage device, amusement equipment, elevator, and lifting equipment, 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, or electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.; energy storage devices can be energy storage walls, base station energy storage, container energy storage, etc.; amusement equipment can be a carousel, a drop tower, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0078] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A battery pack, characterized by, The battery pack comprises: a box body (10) comprising two opposite open ends; a bottom liquid cooling plate (11) connected with the box body (10) to close one of the open ends; a plurality of cell layers (20) stacked in the box body (10) in sequence and located on a side of the bottom liquid cooling plate (11) close to the box body (10); a middle liquid cooling plate (30) arranged between every two adjacent cell layers (20); a top liquid cooling plate (40) connected with the box body (10) to close the other open end and located on a side of the uppermost cell layer (20) away from the middle liquid cooling plate (30); wherein the bottom liquid cooling plate (11), the middle liquid cooling plate (30) and the top liquid cooling plate (40) are used for heat exchange with the cell layers (20) adjacent thereto.

2. The battery pack of claim 1, wherein, The bottom liquid cooling plate (11) is a bottom plate of the battery pack, and the top liquid cooling plate (40) is a top cover of the battery pack.

3. The battery pack of claim 1, wherein, The battery pack further comprises a liquid inlet pipeline (50) and a liquid outlet pipeline (60) arranged in the box body (10); the bottom liquid cooling plate (11), the middle liquid cooling plate (30) and the top liquid cooling plate (40) each have a liquid inlet port (120) and a liquid outlet port (130), a plurality of the liquid inlet ports (120) are in communication with the liquid inlet pipeline (50), and a plurality of the liquid outlet ports (130) are in communication with the liquid outlet pipeline (60); the liquid inlet pipeline (50) and the liquid outlet pipeline (60) are arranged in the box body (10) to communicate with a liquid supply system.

4. The battery pack of claim 1, wherein, The battery pack further comprises a plurality of heat-conducting adhesive layers (70), the lowermost cell layer (20) is fixedly bonded to the bottom liquid cooling plate (11) through the heat-conducting adhesive layer (70), at least one cell layer (20) is fixedly bonded to the middle liquid cooling plate (30) adjacent thereto through the heat-conducting adhesive layer (70), and the uppermost cell layer (20) is fixedly bonded to the top liquid cooling plate (40) through the heat-conducting adhesive layer (70).

5. The battery pack of claim 1, wherein, The box body (10) has a cell mounting area (12) and an electrical mounting area (13) independent of each other, and the cell layers (20) are stacked in the cell mounting area (12) in sequence from top to bottom; the top liquid cooling plate (40) comprises a liquid cooling body (41) and a maintenance cover (42), the liquid cooling body (41) is fixedly connected with the box body (10), the liquid cooling body (41) is provided with a maintenance opening (411) at a position opposite to the electrical mounting area (13), and the maintenance cover (42) is arranged on the maintenance opening (411).

6. The battery pack of claim 1, wherein, Each cell layer (20) comprises a plurality of cell groups (22) arranged along a first direction (X), and each cell group (22) comprises a plurality of cells (21) arranged in sequence along a second direction (Y); the first direction (X) is a width direction of the box body (10), and the second direction (Y) is a length direction of the box body (10). Two adjacent rows of the battery cell groups (22) have first ends facing each other and second ends facing away from each other along the first direction (X), and the first ends of the two adjacent rows of the battery cell groups (22) are provided with one of the polar posts (211) and the explosion-proof valves (212) at the same time, and the second ends of the two adjacent rows of the battery cell groups (22) are provided with the other one of the polar posts (211) and the explosion-proof valves (212) at the same time; The battery pack further comprises an electrical connector (90) arranged in an assembly gap (80) formed between two adjacent rows of the battery cell groups (22) and / or an assembly gap (80) formed between the battery cell groups (22) and the side wall of the box (10) and electrically connected with the polar posts (211).

7. The battery pack of any one of claims 1-6, wherein, Each of the battery cell layers (20) comprises a plurality of rows of battery cell groups (22) arranged along a first direction (X), and each of the rows of battery cell groups (22) comprises a plurality of battery cells (21) arranged along a second direction (Y) in sequence; the first direction (X) is the width direction of the box (10), and the second direction (Y) is the length direction of the box (10); The battery pack further comprises a protective member (110) arranged between two rows of the battery cell groups (22) of the battery cell layer (20) and / or arranged between the battery cell groups (22) and the box (10) to prevent the gas sprayed through the explosion-proof valve (212) of the battery cell group (22) from being sprayed to the adjacent row of the battery cell group (22) and / or the box (10).

8. The battery pack of claim 7, wherein, The protective member (110) comprises a protective portion (101) and a gas guiding portion (102), the gas guiding portion (102) is connected with the protective portion (101), and the gas guiding portion (102) and the protective portion (101) jointly form a gas guiding channel (103), and a through hole (104) is arranged on the gas guiding portion (102); Each of the through holes (104) is opposite to one of the explosion-proof valves (212), and the through hole (104) is in communication with the gas guiding channel (103).

9. The battery pack of claim 8, wherein, The protective member (110) is arranged between two adjacent rows of the battery cell groups (22), the protective member (110) comprises two gas guiding portions (102), each of the gas guiding portions (102) forms one of the gas guiding channels (103) with the protective portion (101), the protective portion (101) is arranged between the two gas guiding channels (103), the gas guiding portion (102) has an L-shaped structure, the two gas guiding portions (102) are connected to form a U-shaped structure, and the protective portion (101) is arranged in the U-shaped structure, so that the protective member (110) has an E-shaped structure. The protective member (110) is arranged between the battery cell groups (22) and the box (10), the protective member (110) comprises one gas guiding portion (102), the gas guiding portion (102) has an L-shaped structure, and the protective portion (101) is connected with the gas guiding portion (102), so that the protective member (110) has a U-shaped structure. The battery pack comprises the battery pack according to any one of claims 1-9.

10. An electrical device, characterized by ​

Images