Power battery pack

Abstract

The present application relates to the technical field of battery packs. Provided is a power battery pack. The power battery pack comprises: a plurality of battery cell groups, wherein each battery cell group comprises a plurality of battery cells, which are sequentially arranged in the planar direction of each battery cell, and the battery cell groups are sequentially arranged in the direction of the thickness of each battery cell; and a plurality of liquid cooling plates, which extend in the extension direction of the battery cell groups, wherein each liquid cooling plate corresponds to at least one battery cell group; each liquid cooling plate comprises a side plate portion and a bottom plate portion that are connected to each other; each side plate portion fits with a side surface of the corresponding battery cell group, and each bottom plate portion fits with a bottom end face of the corresponding battery cell group; and each side plate portion at least serves as a cooling portion, and each bottom plate portion at least serves as a heating portion. The power battery pack of the present application has strong temperature regulation capability and good fast-charging performance, and is easy to disassemble.

Description

Power battery pack

[0001] This application claims priority to Chinese Patent Application No. 202410496749.3, filed on April 23, 2024, entitled "Power Battery Pack", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery pack technology, and more particularly to a power battery pack. Background Technology

[0003] Liquid cooling systems are an indispensable functional module in the development of power battery packs.

[0004] Currently, power battery packs have increasingly higher requirements for fast charging performance, and traditional bottom liquid cooling methods can no longer solve the heat dissipation problems brought about by fast charging. At the same time, the charging performance of the battery cells will also be affected under low temperature conditions, making fast charging impossible. In addition, with the application of module-less structures, the connection between the battery cells and the casing is increasingly being achieved through adhesive bonding, which makes disassembly issues increasingly prominent. Summary of the Invention

[0005] This application provides a power battery pack with strong temperature regulation capability, good fast charging performance, and easy disassembly.

[0006] This application provides a power battery pack, including:

[0007] Multiple cell groups, each cell group includes multiple cells, and the cells are arranged sequentially along the plane of the cells, and the cell groups are arranged sequentially along the thickness of the cells;

[0008] Multiple liquid cooling plates extend along the extension direction of the battery cell assembly, with each liquid cooling plate corresponding to at least one battery cell assembly.

[0009] The liquid cooling plate includes a connected side plate and a bottom plate. The side plate is attached to the side surface of the battery cell assembly, and the bottom plate is attached to the bottom end surface of the battery cell assembly. The side plate serves as at least a cooling section, and the bottom plate serves as at least a heating section.

[0010] In one possible implementation, the base plate includes a left plate and a right plate, and the side plate is connected between the left plate and the right plate.

[0011] The two side plates of the side plate are respectively attached to the side surfaces of the two adjacent cell groups, and the left and right plates are respectively attached to the bottom surfaces of the two adjacent cell groups.

[0012] In one possible implementation, the side plate is connected to one side of the base plate, one side surface of the side plate is attached to the side surface of a battery cell assembly, and the base plate is attached to the bottom end surface of a battery cell assembly.

[0013] In one possible implementation, the interior of the side plate is not connected to the interior of the bottom plate, with the side plate serving as a cooling section and the bottom plate serving as a heating section.

[0014] In one possible implementation, a heating element is provided inside the base plate.

[0015] In one possible implementation, when the liquid cooling plate is separated from the battery pack housing, the heating elements installed in each base plate are electrically connected to an external power source.

[0016] In one possible implementation, the interior of the side plate portion is connected to the interior of the bottom plate portion, and the side plate portion and the bottom plate portion together serve as a cooling portion or a heating portion.

[0017] In one possible implementation, the side plate is provided with an inlet and an outlet, which are located at opposite ends of the side plate in the extending direction.

[0018] In one possible implementation, the power battery pack further includes:

[0019] The liquid inlet pipe and liquid outlet pipe are respectively located on both sides of the extension direction of each cell group; the liquid inlet of each side plate is connected to the liquid inlet pipe, and the liquid outlet of each side plate is connected to the liquid outlet pipe.

[0020] In one possible implementation, both the side plate and the bottom plate are bonded to the battery cell assembly.

[0021] The power battery pack provided in this application includes multiple cell groups and multiple liquid cooling plates. Each cell group includes multiple cells, which are arranged sequentially along their own planar direction and along the thickness direction of the cells. Each liquid cooling plate extends along the extension direction of the cell group, and each liquid cooling plate corresponds to at least one cell group to cool the cell group. The liquid cooling plate has connected side plates and a bottom plate, with the side plates fitting against the side surfaces of the cell groups and the bottom plates fitting against the bottom surfaces of the cell groups. Furthermore, the side plates serve at least as cooling units to cool the cell groups, and the bottom plates serve at least as heating units to heat the cell groups. In this way, the liquid cooling plate can both cool and heat the cell groups, and the large contact area between the side plates and the cell groups results in good cooling performance, enhancing the temperature regulation capability of the power battery pack and improving its fast-charging performance. Furthermore, the battery cells and liquid cooling plates are easy to disassemble, facilitating the maintenance and replacement of the power battery pack. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 is a schematic diagram of the power battery pack provided in an embodiment of this application;

[0024] Figure 2 is an exploded view of the power battery pack in Figure 1;

[0025] Figure 3 is a schematic diagram of the battery module assembly provided in an embodiment of this application;

[0026] Figure 4 is a schematic diagram of the battery cell module provided in an embodiment of this application;

[0027] Figure 5 is an exploded view of the battery cell module in Figure 4;

[0028] Figure 6 is a schematic diagram of the structure of the liquid cooling plate provided in an embodiment of this application;

[0029] Figure 7 is an internal cross-sectional view of the liquid cooling plate provided in an embodiment of this application.

[0030] Explanation of reference numerals in the attached drawings: 10-Power battery pack; 10a-Cell module assembly; 10b-Cell module; 100-Casing; 200-Cell group; 300-Liquid cooling plate; 400-Inlet pipe; 500-Outlet pipe; 110-Main casing; 210-Cell; 310-Side plate; 320-Bottom plate; 410-Main inlet pipe; 420-Inlet branch pipe; 510-Main outlet pipe; 520-Outlet branch pipe; 311-Inlet port; 312-Outlet port; 313-Disassembly structure; 314-Separator; 321-Left plate; 322-Right plate; 3201-Heating element. Detailed Implementation

[0031] As described in the background section, in related technologies, power battery packs typically employ bottom liquid cooling to dissipate heat from the battery cells. Specifically, a liquid cooling plate is placed at the bottom of the battery module (a module formed by packaging multiple battery cells) or unpackaged battery cells to cool the bottom of the cells, thereby dissipating heat from the cells.

[0032] However, with the technological advancements in power battery packs and increasing user demands, the requirements for fast charging performance in power battery packs are becoming increasingly stringent. Traditional bottom liquid cooling methods are slow and ineffective at cooling the battery cells, failing to meet the heat dissipation requirements of fast charging. Furthermore, when the power battery pack operates at low temperatures, the low cell temperature affects the cell's charging performance, preventing the power battery pack from achieving fast charging functionality.

[0033] Furthermore, with the application of module-less structures (as opposed to battery modules, where each cell is directly installed inside the casing), adhesive bonding is increasingly used to connect the cells and the casing. Liquid cooling methods in related technologies also make cell disassembly inconvenient.

[0034] In view of this, embodiments of this application provide a power battery pack, which includes multiple cell groups and multiple liquid cooling plates. Each cell group includes multiple cells, and the cells in each cell group are arranged sequentially along their own planar direction, and the cell groups are arranged sequentially along the thickness direction of the cells. Each liquid cooling plate extends along the extension direction of the cell group, and each liquid cooling plate corresponds to at least one cell group to cool the cell group. The liquid cooling plate has connected side plates and bottom plates, with the side plates fitting against the side surfaces of the cell groups and the bottom plates fitting against the bottom surfaces of the cell groups. Furthermore, the side plates at least serve as cooling sections for cooling the cell groups, and the bottom plates at least serve as heating sections for heating the cell groups. In this way, the liquid cooling plates can both cool and heat the cell groups, and the large contact area between the side plates and the cell groups results in good cooling performance, enhancing the temperature regulation capability of the power battery pack and improving its fast-charging performance. Furthermore, the battery cells and liquid cooling plates are easy to disassemble, facilitating the maintenance and replacement of the power battery pack.

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0036] Figure 1 is a schematic diagram of the power battery pack provided in an embodiment of this application. Figure 2 is an exploded view of the power battery pack in Figure 1. Figure 3 is a schematic diagram of the cell module assembly provided in an embodiment of this application.

[0037] Referring to Figures 1 and 2, this application embodiment provides a power battery pack 10, which can be applied in new energy vehicles, such as pure electric vehicles or hybrid vehicles. Alternatively, the power battery pack 10 can also be applied in other fields such as solar / wind power energy storage systems, power grid / electric power supply systems, base station battery power supplies, and electric robots.

[0038] Specifically, the power battery pack 10 includes a housing 100, a number of battery cells 210 and a number of liquid cooling plates 300. The housing 100 is the basic support structure of the power battery pack 10. The number of battery cells 210 and the number of liquid cooling plates 300 are all arranged inside the housing 100 to assemble the power battery pack 10 as a whole.

[0039] These battery cells 210 are the core components of the power battery pack 10, and are used to charge and discharge the power battery pack 10. The charging process of the battery cell 210 converts electrical energy into chemical energy for energy storage. The discharging process of the battery cell 210 converts chemical energy into electrical energy to provide current to electrical devices.

[0040] The plurality of battery cells 210 can be respectively attached to the plurality of liquid cooling plates 300, and heat exchange can be carried out between the liquid cooling plates 300 and the battery cells 210. The plurality of liquid cooling plates 300 are used to cool or heat the plurality of battery cells 210 to maintain the battery cells 210 at a suitable operating temperature. In turn, the working performance of the battery cells 210 is guaranteed, and the stability and reliability of the power battery pack 10 are guaranteed.

[0041] It is understood that the power battery pack 10 in Figures 1 and 2 only shows a portion of the structure of the housing 100 in order to demonstrate the internal structure of the power battery pack 10. For example, the figures show the main housing 110 of the housing 100. The housing 100 may also include a cover (not shown in the figures), which covers the opening at the top of the main housing 110. The cover and the main housing 110 together form the housing 100. The cover and the main housing 110 together form a sealed receiving cavity, within which the plurality of battery cells 210 and the plurality of liquid cooling plates 300 are disposed.

[0042] Referring to Figure 2 or Figure 3, the plurality of battery cells 210 are arranged in a battery cell group 200 within the housing 100. Alternatively, the housing 100 may contain multiple battery cell groups 200 arranged sequentially, each group comprising a plurality of sequentially arranged battery cells 210. Multiple liquid cooling plates 300 are correspondingly disposed to the multiple battery cell groups 200, extending along the extending direction of the battery cell groups 200. Each liquid cooling plate 300 corresponds to at least one battery cell group 200, allowing for cooling or heating of the multiple battery cell groups 200 through the liquid cooling plates 300.

[0043] Each cell assembly 200 is connected to a corresponding liquid cooling plate 300, and each liquid cooling plate 300 and the cell assembly 200 connected thereto form a whole. For ease of explanation, in this embodiment, the whole module consisting of a liquid cooling plate 300 and the cell assembly 200 connected thereto is defined as cell module 10b. The whole consisting of all cell assemblies 200 and the liquid cooling plates 300, or the whole consisting of the sequentially arranged cell modules 10b, is defined as cell module assembly 10a.

[0044] In this assembly, each battery cell 210 in the battery cell module assembly 10a can be erected inside the housing 100, or in other words, each battery cell group 200 can be erected inside the housing 100. For example, each battery cell group 200 can be perpendicular to the inner bottom wall of the housing 100. In each battery cell group 200, each battery cell 210 can be arranged sequentially along its own planar direction. Each battery cell group 200 can be arranged sequentially along the thickness direction of the battery cell 210.

[0045] By vertically erecting the battery cells 210 within the housing 100 and arranging them in a cell group 200, the battery cells 210 are arranged in an array within the housing 100. This results in a smaller overall space occupied by the battery cells 210 and a higher density of arrangement, which helps to reduce the volume of the power battery pack 10, increase its capacity, and improve its fast-charging performance.

[0046] For example, referring to Figure 3, when the battery cell 210 is vertically erected inside the housing 100, the arrangement direction of each battery cell group 200 (the X direction in the figure) can correspond to the thickness direction of the battery cell 210, or in other words, each battery cell group 200 is arranged sequentially along the thickness direction of the battery cell 210. Within each battery cell group 200, each battery cell 210 can be arranged along its own length direction (the Y direction shown in the figure), or in other words, the battery cell group 200 can extend along the length direction of the battery cell 210. The height direction of the battery cell group 200 (the Z direction shown in the figure) is the height direction of a single battery cell 210, and the height direction of the battery cell group 200 can also be considered as the width direction of the battery cell 210.

[0047] By arranging the cells 210 in each cell group 200 along their own length, with the height of the cell group 200 corresponding to the width of the cells 210, the cell group 200 can maintain a relatively small height. In this way, while ensuring a high cell module 10b with a large arrangement density and a large capacity, the small height of the cell module 10b reduces the height of the power battery pack 10, which is beneficial for making the power battery pack 10 thinner and lighter.

[0048] Referring to Figure 2, the power battery pack 10 may further include an inlet pipe 400 and an outlet pipe 500. Each liquid cooling plate 300 is provided with an inlet 311 and an outlet 312. The inlet 311 and outlet 312 on the liquid cooling plate 300 are both connected to the interior of the liquid cooling plate 300, and the inlet 311 of each liquid cooling plate 300 is connected to the inlet pipe 400, and the outlet 312 of each liquid cooling plate 300 is connected to the outlet pipe 500. Liquid enters the liquid cooling plate 300 from the inlet pipe 400 through the inlet 311 on the liquid cooling plate 300, circulates within the liquid cooling plate 300, and then flows out through the outlet 312 of the liquid cooling plate 300 to the outlet pipe 500, and is finally discharged from the outlet pipe 500.

[0049] For example, the liquid inlet pipe 400 may include a main liquid inlet pipe 410 and multiple branch liquid inlet pipes 420. Each branch liquid inlet pipe 420 is connected to the main liquid inlet pipe 410 and is connected to the liquid inlet port 311 of each liquid cooling plate 300. Each liquid cooling plate 300 is connected to the main liquid inlet pipe 410 through a corresponding branch liquid inlet pipe 420. Similarly, the liquid outlet pipe 500 may include a main liquid outlet pipe 510 and multiple branch liquid outlet pipes 520. Each branch liquid outlet pipe 520 is connected to the main liquid outlet pipe 510 and is connected to the liquid outlet port 312 of each liquid cooling plate 300. Each liquid cooling plate 300 is connected to the main liquid outlet pipe 510 through a corresponding branch liquid outlet pipe 520.

[0050] The liquid inlet pipe 400 has its inlet branch pipes 420 detachably connected to the liquid inlet ports 311 on each liquid cooling plate 300, and the liquid outlet pipe 500 has its outlet branch pipes 520 detachably connected to the liquid outlet ports 312 on each liquid cooling plate 300. For example, the liquid inlet branch pipes 420 of the liquid inlet pipe 400 can be connected to the liquid inlet ports 311 on each liquid cooling plate 300 via quick connectors, and the liquid outlet branch pipes 520 of the liquid outlet pipe 500 can be connected to the liquid outlet ports 312 on each liquid cooling plate 300 via quick connectors. In this way, the liquid inlet pipes 400 and 500 can be quickly and non-destructively disassembled from the liquid cooling plate 300 without disassembling the cell assembly 200 or the liquid cooling plate 300, which facilitates the assembly and disassembly of the power battery pack 10 and reduces the maintenance and replacement costs of the power battery pack 10.

[0051] Figure 4 is a schematic diagram of the battery cell module provided in an embodiment of this application. Figure 5 is an exploded view of the battery cell module in Figure 4. Figure 6 is a schematic diagram of the liquid cooling plate provided in an embodiment of this application.

[0052] Referring to Figures 4 and 5, for a single cell module 10b, to facilitate the connection of the liquid cooling plate 300 with the inlet pipe 400 and the outlet pipe 500, at least one end of the liquid cooling plate 300 can extend beyond the end of the cell assembly 200 along the extending direction of the cell assembly 200. For ease of explanation, in this embodiment, the portion of the liquid cooling plate 300 (in the extending direction of the cell assembly 200) extending beyond the cell assembly 200 is defined as the protruding end of the liquid cooling plate 300.

[0053] The liquid inlet 311 and outlet 312 on the liquid cooling plate 300 can be located at the extended end of the liquid cooling plate 300. The extended end of the liquid cooling plate 300 will not be obstructed by the cell assembly 200, leaving sufficient space for the liquid inlet 311 and outlet 312. Furthermore, since the extended end of the liquid cooling plate 300 is outside the end of the cell assembly 200 in the extending direction, there is no need to design a protruding portion for the liquid cooling plate 300 to accommodate the liquid inlet 311 and outlet 312 in the height direction of the cell assembly 200. This results in a smaller overall height and a more regular structure for the cell module 10b, simplifying the structural design of the housing 100 and facilitating the miniaturization of the power battery pack 10.

[0054] Referring to Figures 4 and 5, in some examples, the two ends of the liquid cooling plate 300 can extend beyond the two ends of the cell assembly 200 in the extending direction of the cell assembly 200. In this case, both ends of the liquid cooling plate 300 in the length direction are extending ends. The liquid inlet 311 can be located at one extending end of the liquid cooling plate 300, and the liquid outlet 312 can be located at the other extending end of the liquid cooling plate 300. Correspondingly, the liquid inlet pipe 400 and the liquid outlet pipe 500 can be respectively located on both sides of the extending direction of each cell assembly 200; in other words, the liquid inlet pipe 400 and the liquid outlet pipe 500 are located on opposite sides of the cell module assembly 10a. The liquid inlet pipe 400 corresponds to and communicates with the liquid inlet 311 of each liquid cooling plate 300, and the liquid outlet pipe 500 corresponds to and communicates with the liquid outlet 312 of each liquid cooling plate 300.

[0055] With this configuration, the liquid enters from one end of the liquid cooling plate 300, flows from that end to the other end, and exits from the other end. The liquid flow path design within the liquid cooling plate 300 is reasonable, ensuring the balance of liquid pressure and flow rate. Furthermore, the inlet pipe 400 and outlet pipe 500 are located on opposite sides of the cell module assembly 10a, resulting in a more rational layout and better symmetry within the housing 100, which is beneficial for improving the balance and reliability of the power battery pack 10.

[0056] Of course, in other examples, the liquid cooling plate 300 may extend beyond the end of the cell assembly 200 at only one end in the extending direction of the cell assembly 200. In this case, one end of the liquid cooling plate 300 in the longitudinal direction is the extended end, and both the liquid inlet 311 and the liquid outlet 312 can be located at this end of the liquid cooling plate 300. Correspondingly, the liquid inlet pipe 400 and the liquid outlet pipe 500 may be located on the same side in the extending direction of the cell assembly 200; in other words, the liquid inlet pipe 400 and the liquid outlet pipe 500 are located on the same side of the cell module assembly 10a.

[0057] Referring to Figures 5 and 6, in this embodiment, the liquid cooling plate 300 includes a side plate portion 310 and a bottom plate portion 320, which are connected together. For example, the side plate portion 310 and the bottom plate portion 320 can be an integrally formed structure; in other words, the main structure of the liquid cooling plate 300 can be an integrally formed part. Alternatively, the side plate portion 310 and the bottom plate portion 320 can be formed separately, and the two can be connected by welding, bonding, or locking components such as bolts or screws.

[0058] In this configuration, the side plate portion 310 of the liquid cooling plate 300 is attached to the side surface of the battery cell assembly 200, which is the surface of the battery cell assembly 200 facing (or away from) the adjacent battery cell assembly 200. In other words, the side plate portion 310 of the liquid cooling plate 300 is attached to the surface of the battery cell assembly 200 facing (or away from) the adjacent battery cell assembly 200. The bottom plate portion 320 of the liquid cooling plate 300 can be located between the bottom end face of the battery cell assembly 200 and the inner bottom wall of the housing 100, and the bottom plate portion 320 of the liquid cooling plate 300 is attached to the bottom end face of the battery cell assembly 200.

[0059] Regarding the connection between the liquid cooling plate 300 and the cell assembly 200, both the side plate portion 310 and the bottom plate portion 320 of the liquid cooling plate 300 can be bonded to the cell assembly 200. That is, the side surface of the cell assembly 200 can be bonded to the side plate portion 310 of the liquid cooling plate 300, and the bottom end face of the cell assembly 200 can be bonded to the bottom plate portion 320 of the liquid cooling plate 300, thereby achieving the connection between the cell assembly 200 and the liquid cooling plate 300, connecting the liquid cooling plate 300 and the corresponding cell assembly 200 together to form the cell module 10b.

[0060] In this embodiment, the side plate portion 310 of the liquid cooling plate 300 serves at least as a cooling portion, and the bottom plate portion 320 of the liquid cooling plate 300 serves at least as a heating portion. In other words, the side plate portion 310 of the liquid cooling plate 300 is used at least to cool each cell 210 in the cell assembly 200 to reduce the temperature of the cell 210. The bottom plate portion 320 of the liquid cooling plate 300 is used at least to heat each cell 210 in the cell assembly 200 to increase the temperature of the cell 210.

[0061] During the operation of the power battery pack 10, when the power of the battery cell 210 is high and the heat generation is large, the battery cell 210 can be cooled by at least the side plate portion 310 of the liquid cooling plate 300 to reduce the temperature of the battery cell 210, enhance the heat dissipation performance of the battery cell 210, and ensure the stability and reliability of the battery cell 210's operating performance. When the battery cell 210 operates under low-temperature conditions, the battery cell 210 can be heated by at least the bottom plate portion 320 of the liquid cooling plate 300 to raise the temperature of the battery cell 210, so that the battery cell 210 operates at a suitable temperature and ensures that the battery cell 210 can achieve fast charging function.

[0062] Since each cell 210 in the cell assembly 200 is erected inside the housing 100, the side surface of the cell 210 has the largest surface area. Therefore, by using the side plate portion 310 of the liquid cooling plate 300 as at least a cooling portion, the contact area between the side plate portion 310 of the liquid cooling plate 300 and the side surface of the cell 210 is large, resulting in high heat exchange efficiency and good effect. This can effectively enhance the heat dissipation performance of the cell 210, reduce the temperature of the cell 210, ensure the working performance of the cell 210, and improve the stability and reliability of the fast charging performance of the power battery pack 10.

[0063] Compared to the severe challenges posed by excessively high temperatures in cell 210, the problems faced by cell 210 under low-temperature conditions are relatively minor, as the required temperature rise for cell 210 under low-temperature conditions is less significant. To address this, by utilizing at least the bottom plate portion 320 of the liquid cooling plate 300 as a heating element, the heat generated by the bottom plate portion 320 is transferred to the bottom surface of cell 210, thereby raising the temperature of cell 210 and maintaining it at a suitable operating temperature to ensure the fast-charging performance of the power battery pack 10.

[0064] Furthermore, when the battery cell assembly 200 is connected to the liquid cooling plate 300 by adhesive bonding, by using at least the bottom plate portion 320 of the liquid cooling plate 300 as a heating element, the heat generated by the heating element acts on the adhesive layer between the battery cell assembly 200 and the liquid cooling plate 300, easily melting the adhesive layer and reducing the bonding force between the battery cell assembly 200 and the liquid cooling plate 300. This facilitates the disassembly of the battery cell assembly 200 and the liquid cooling plate 300. In other words, it facilitates the disassembly of a single battery cell module 10b and the disassembly of the telecommunications module assembly.

[0065] When the side surface of the battery cell assembly 200 separates from the side plate portion 310 of the liquid cooling plate 300, the adhesive layer between the side surface of the battery cell assembly 200 and the side plate portion 310 of the liquid cooling plate 300 is subjected to shear force. This shear force facilitates the separation of the side surface of the battery cell assembly 200 from the side plate portion 310 of the liquid cooling plate 300. Therefore, when only the bottom plate portion 320 of the liquid cooling plate 300 serves as a heating element, the battery cell assembly 200 can be easily removed from the liquid cooling plate 300. Of course, if both the bottom plate portion 320 and the side plate portion 310 of the liquid cooling plate 300 serve as heating elements, the battery cell assembly 200 can be removed from the liquid cooling plate 300 even more easily.

[0066] In addition, to facilitate the separation of the liquid cooling plate 300 and the battery cell assembly 200, referring to Figures 5 or 6, a disassembly structure 313 can be provided on the liquid cooling plate 300. The disassembly structure 313 is, for example, provided on the side plate portion 310 of the liquid cooling plate 300. The disassembly section is a structure on the liquid cooling plate 300 used for lifting or skidding operations, allowing the liquid cooling plate 300 to be lifted using the disassembly structure 313, thereby separating the liquid cooling plate 300 from the battery cell assembly 200. For example, the disassembly structure 313 can be a disassembly hole provided on the side plate portion 310 of the liquid cooling plate 300, through which lifting or skidding tools can be inserted to apply force to the liquid cooling plate 300.

[0067] Referring again to Figure 5 or Figure 6, since the side plate portion 310 of the liquid cooling plate 300 serves as at least a cooling section, the liquid inlet 311 and the liquid outlet 312 on the liquid cooling plate 300 can be provided on the side plate portion 310, so that coolant can enter through the liquid inlet 311 on the side plate portion 310 and flow out through the liquid outlet 312 on the side plate portion 310. In this way, coolant can flow at least within the side plate portion 310 of the liquid cooling plate 300 to realize the function of the side plate portion 310 as a cooling section, and the coolant within the side plate portion 310 carries away the heat of the battery cell 210.

[0068] Taking the liquid inlet pipe 400 and liquid outlet pipe 500 located on opposite sides of the cell assembly 200 as an example, at least both ends of the side plate portion 310 of the liquid cooling plate 300 can extend beyond both ends of the cell assembly 200 in the length direction. The liquid inlet 311 and liquid outlet 312 can be respectively provided at the extended ends of both ends of the side plate portion 310. The liquid inlet 311 on the side plate portion 310 of each liquid cooling plate 300 is connected to the liquid inlet pipe 400, and the liquid outlet 312 on the side plate portion 310 of each liquid cooling plate 300 is connected to the liquid outlet pipe 500.

[0069] Referring to Figure 6, in some embodiments, a liquid cooling plate 300 can simultaneously cool or heat two adjacent battery cell groups 200. To achieve this, the base plate portion 320 of the liquid cooling plate 300 can be designed with a larger width, and the side plate portion 310 of the liquid cooling plate 300 can be connected to the middle portion of the base plate portion 320. Specifically, the base plate portion 320 of the liquid cooling plate 300 may include a left plate portion 321 and a right plate portion 322, and the side plate portion 310 can be connected between the left plate portion 321 and the right plate portion 322. The liquid cooling plate 300 can have an inverted "T" shaped structure.

[0070] At this time, the two adjacent cell groups 200 corresponding to the liquid cooling plate 300 are located on both sides of the side plate portion 310 of the liquid cooling plate 300. The two adjacent cell groups 200 are respectively attached to the two side plate surfaces of the side plate portion 310 of the liquid cooling plate 300, specifically, the opposite side surfaces of the two cell groups 200 are respectively attached to the two side plate surfaces of the side plate portion 310. At the same time, of the two adjacent cell groups 200, the bottom end surface of one cell group 200 is attached to the left plate portion 321 of the bottom plate portion 320 of the liquid cooling plate 300, and the bottom end surface of the other cell group 200 is attached to the right plate portion 322 of the bottom plate portion 320 of the liquid cooling plate 300.

[0071] By using a single liquid cooling plate 300 to simultaneously cool or heat two adjacent cell groups 200, the utilization rate of the liquid cooling plate 300 is improved, reducing the number of liquid cooling plates 300 in the cell module assembly 10a and lowering its production cost. Furthermore, each liquid cooling plate 300 only requires a single side plate 310, resulting in a smaller volume and reducing the space occupied by all liquid cooling plates 300 in the cell module assembly 10a. This, in turn, reduces the overall volume of the cell module assembly 10a, facilitating the miniaturization design of the power battery pack 10.

[0072] Furthermore, since the side plate portion 310 of the liquid cooling plate 300 is sandwiched between two adjacent cell groups 200, for the entire cell module assembly 10a, two cell groups 200 are provided between the side plate portions 310 of two adjacent liquid cooling plates 300 (see Figure 3). This results in a larger space between the protruding ends of the side plate portions 310 of each pair of adjacent liquid cooling plates 300, facilitating the placement of the inlet branch pipe 420 (or outlet branch pipe 520) of the inlet pipe 400 (or outlet pipe 500) within this space. Consequently, the layout of the cell module assembly 10a is more rational, facilitating the connection between the inlet pipe 400 (or outlet pipe 500) and the inlet port 311 (or outlet port 312) on each liquid cooling plate 300.

[0073] In other embodiments, the liquid cooling plate 300 and the battery cell assembly 200 can be arranged in a one-to-one correspondence, with one liquid cooling plate 300 used to cool or heat one battery cell assembly 200. For this purpose, the bottom plate portion 320 of the liquid cooling plate 300 can be designed with a smaller width, which can match the width of the bottom end face of the battery cell assembly 200. Specifically, the side plate portion 310 of the liquid cooling plate 300 can be connected to one side of the bottom plate portion 320, or in other words, the bottom plate portion 320 of the liquid cooling plate 300 can be connected to one side of the side plate portion 310, and the liquid cooling plate 300 can have a positive (or negative) "L" shaped structure.

[0074] At this time, the cell assembly 200 corresponding to the liquid cooling plate 300 is located on one side of the side plate portion 310 of the liquid cooling plate 300, and the cell assembly 200 is located on the side of the bottom plate portion 320 of the liquid cooling plate 300. The side surface of the cell assembly 200 is attached to the side plate portion 310 of the liquid cooling plate 300, and the bottom end surface of the cell assembly 200 is attached to the bottom plate portion 320 of the liquid cooling plate 300. The liquid cooling plate 300 and the corresponding cell assembly 200 together form the cell module 10b.

[0075] A liquid cooling plate 300 is used to cool or heat a cell assembly 200. Sufficient heat exchange between the liquid cooling plate 300 and the cell assembly 200 improves the heat exchange efficiency, thereby increasing the heat dissipation (or heating) efficiency of the cell assembly 200 and enhancing its performance. Furthermore, the one-to-one assembly relationship between the liquid cooling plate 300 and the cell assembly 200 facilitates the assembly and disassembly of the cell module 10b, improving its efficiency.

[0076] Figure 7 is an internal cross-sectional view of the liquid cooling plate provided in an embodiment of this application. Referring to Figure 7, regarding the design of the heating section of the liquid cooling plate 300, in one embodiment, the interior of the side plate portion 310 and the interior of the bottom plate portion 320 of the liquid cooling plate 300 may not be connected. In this case, the liquid cooling plate 300 forms a liquid cooling cavity only in its side plate portion 310, and the coolant flows only in the side plate portion 310 of the liquid cooling plate 300. A heating element 3201 can be provided in the bottom plate portion 320 of the liquid cooling plate 300. That is, the side plate portion 310 of the liquid cooling plate 300 serves as the cooling section, while the bottom plate portion 320 of the liquid cooling plate 300 serves as the heating section.

[0077] The side plate portion 310 of the liquid cooling plate 300 may be provided with multiple partitions 314 at intervals along the height direction of the side plate portion 310. This creates multiple small cavities within the side plate portion 310 along its height direction, which are sequentially connected. This prevents the coolant from flowing only through the bottom of the side plate portion 310 due to gravity, allowing the coolant to flow evenly across all areas along the height direction of the side plate portion 310. This ensures effective heat dissipation for the battery cell assembly 200 by the side plate portion 310 of the liquid cooling plate 300, improves the temperature uniformity of the battery cell assembly 200, and guarantees the reliability and stability of the battery cell assembly 200's operation.

[0078] When the power battery pack 10 is operating normally, it supplies power internally to provide current to the heating elements 3201 installed in the base plate 320 of each liquid cooling plate 300. For example, the current to the heating elements 3201 in the base plate 320 of each liquid cooling plate 300 can be independently controlled to independently control the heating temperature of each liquid cooling plate 300. Furthermore, the heating temperature of each liquid cooling plate 300 can be controlled according to the heat required by each cell module 10b to meet the temperature requirements of each cell module 10b.

[0079] When the power battery pack 10 is removed, the cell module 10b is moved out of the housing 100, and the liquid cooling plate 300 separates from the inner bottom wall of the main housing 110. At this time, an external power supply can be used to power each liquid cooling plate 300 so that each liquid cooling plate 300 can normally heat each cell group 200. For example, the heating element 3201 provided in the bottom plate portion 320 of each liquid cooling plate 300 can be electrically connected to an external power supply so that each liquid cooling plate 300 can perform heating independently.

[0080] Referring again to Figure 7, when the side plate portion 310 of the liquid cooling plate 300 is connected to the middle of the bottom plate portion 320, and the bottom plate portion 320 includes a left plate portion 321 and a right plate portion 322, heating elements 3201 can be respectively provided in the left plate portion 321 and the right plate portion 322. When the liquid cooling plate 300 is separated from the housing 100, the left plate portion 321 and the right plate portion 322 of a single liquid cooling plate 300 can be electrically connected to a common external power supply, and the left plate portion 321 and the right plate portion 322 of a single liquid cooling plate 300 can maintain the same heating temperature. Alternatively, the left plate portion 321 and the right plate portion 322 of a single liquid cooling plate 300 can also be electrically connected to an external power supply separately, allowing for individual control of the heating temperature of the left plate portion 321 and the right plate portion 322 of a single liquid cooling plate 300.

[0081] For example, the heating element 3201 provided in the bottom plate portion 320 of the liquid cooling plate 300 can be a heating wire or a PTC (positive temperature coefficient) heater.

[0082] In another embodiment, the interior of the side plate portion 310 and the interior of the bottom plate portion 320 of the liquid cooling plate 300 can be interconnected. In this case, the side plate portion 310 and the bottom plate portion 320 of the liquid cooling plate 300 together form a liquid cavity, and the liquid can circulate within the side plate portion 310 and the bottom plate portion 320. In other words, the side plate portion 310 and the bottom plate portion 320 of the liquid cooling plate 300 can jointly serve as a cooling section or a heating section, utilizing the heat exchange between the liquid and the battery cell assembly 200 to cool or heat the battery cell assembly 200.

[0083] When cooling of the battery cell assembly 200 is required, the side plate portion 310 and the bottom plate portion 320 of the liquid cooling plate 300 simultaneously serve as cooling sections, and a coolant with a lower temperature flows within the liquid cooling plate 300. When heating of the battery cell assembly 200 is required, the side plate portion 310 and the bottom plate portion 320 of the liquid cooling plate 300 simultaneously serve as heating sections, and a heating liquid with a higher temperature flows within the liquid cooling plate 300.

[0084] Specifically, when cooling the battery cell assembly 200 is required, coolant can be introduced into the side plate portion 310 of the liquid cooling plate 300 through the inlet 311. After circulating within the side plate portion 310 and the bottom plate portion 320, the coolant flows out through the outlet 312 on the side plate portion 310 to cool the battery cell assembly 200. When heating the battery cell assembly 200 is required, heating fluid can be introduced into the side plate portion 310 through the inlet 311. After circulating within the side plate portion 310 and the bottom plate portion 320, the heating fluid flows out through the outlet 312 on the side plate portion 310 to heat the battery cell assembly 200.

[0085] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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 application.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A power battery pack, characterized in that, include: Multiple cell groups, each cell group comprising multiple cells, wherein the cells are arranged sequentially along the plane of the cells and the cell groups are arranged sequentially along the thickness of the cells; Multiple liquid cooling plates extend along the extension direction of the battery cell assembly, and each liquid cooling plate corresponds to at least one battery cell assembly. The liquid cooling plate includes a side plate portion and a bottom plate portion connected together. The side plate portion is attached to the side surface of the battery cell assembly, and the bottom plate portion is attached to the bottom end surface of the battery cell assembly. The side plate portion serves as at least a cooling portion, and the bottom plate portion serves as at least a heating portion.

2. The power battery pack according to claim 1, characterized in that, The base plate includes a left plate and a right plate, and the side plate is connected between the left plate and the right plate; The two side plates of the side plate are respectively attached to the side surfaces of the two adjacent battery cell groups, and the left plate and the right plate are respectively attached to the bottom surfaces of the two adjacent battery cell groups.

3. The power battery pack according to claim 1, characterized in that, The side plate is connected to one side of the bottom plate, one side surface of the side plate is in contact with the side surface of one of the battery cells, and the bottom plate is in contact with the bottom end surface of one of the battery cells.

4. The power battery pack according to any one of claims 1-3, characterized in that, The interior of the side plate is not connected to the interior of the bottom plate. The side plate serves as the cooling section, and the bottom plate serves as the heating section.

5. The power battery pack according to claim 4, characterized in that, A heating element is provided inside the base plate.

6. The power battery pack according to claim 5, characterized in that, When the liquid cooling plate is separated from the housing of the power battery pack, the heating elements installed in each of the bottom plates are electrically connected to an external power source.

7. The power battery pack according to any one of claims 1-3, characterized in that, The interior of the side plate portion is connected to the interior of the bottom plate portion, and the side plate portion and the bottom plate portion together serve as the cooling portion or the heating portion.

8. The power battery pack according to any one of claims 1-3, characterized in that, The side plate is provided with a liquid inlet and a liquid outlet, which are located at opposite ends of the side plate in the extending direction.

9. The power battery pack according to claim 8, characterized in that, Also includes: The liquid inlet pipe and the liquid outlet pipe are respectively disposed on both sides of the extension direction of each of the battery cells; the liquid inlet of each of the side plates is connected to the liquid inlet pipe, and the liquid outlet of each of the side plates is connected to the liquid outlet pipe.

10. The power battery pack according to any one of claims 1-3, characterized in that, Both the side plate and the bottom plate are bonded to the battery cell assembly.

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