Battery pack and vehicle

Abstract

The present application relates to the technical field of batteries. Provided are a battery pack and a vehicle. The battery pack comprises: a housing assembly; a water-cooling plate assembly, which is arranged in the middle of the housing assembly in the direction of height of the housing assembly; and at least two battery modules, which are both located in a housing, wherein one of the at least two battery modules is located on a first side of the water-cooling plate assembly, and the other of the at least two battery modules is located on a second side of the water-cooling plate assembly, the first side being arranged opposite the second side; and the at least two battery modules each comprise a plurality of battery cells and a plurality of CCS assemblies, each CCS assembly located on a first side of a water-cooling plate and each CCS assembly located on a second side of the water-cooling plate being located on one side of a terminal post of each battery cell, and each CCS assembly being engaged with each battery cell. In this way, the single water-cooling plate assembly can realize large surface cooling, thus reducing the risk of liquid leakage and lowering costs.

Description

Battery pack and vehicle Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery pack and a vehicle. This application claims priority to a patent application filed with the State Intellectual Property Office of China on December 6, 2023, with application number 2023116690294 and titled “Battery Pack and Vehicle.” Background Art

[0002] GB38031-2020 Safety Requirements for Power Batteries for Electric Vehicles requires a minimum of 5 minutes from thermal runaway to visible flames outside the battery pack. Insulation pads were previously used to prevent heat spread. One company employed multiple water-cooling plates placed over the battery cells for insulation, but this introduced leakage risks and increased costs. Furthermore, welding connections between the cells increased costs.

[0003] Summary of the Invention

[0004] The main purpose of the present application is to provide a battery pack and a vehicle to solve the problem of leakage risk caused by the use of multiple sets of water-cooling plates in battery packs in the prior art.

[0005] To achieve the above-mentioned objectives, according to one aspect of the present application, a battery pack is provided. The battery pack includes: a housing assembly; a water-cooling plate assembly, the water-cooling plate assembly being arranged in the middle of the housing assembly along the height direction of the housing assembly; at least two battery modules, both of which are located within the housing, and one of the at least two battery modules is located on a first side of the water-cooling plate assembly, and the other of the at least two battery modules is located on a second side of the water-cooling plate assembly, the first side and the second side being arranged opposite each other, the at least two battery modules each including a plurality of battery cells and a plurality of CCS assemblies, the CCS assemblies located on the first side and the second side of the water-cooling plate being located on one side of each battery cell pole, and the CCS assemblies being snap-fitted to each battery cell.

[0006] Furthermore, at least two pole clamps are provided on one side of each battery cell, each pole clamp is provided with a limiting step, the height of the limiting step is set along the height direction of the pole clamp, and each CCS component includes: a CCS bracket, a plurality of limiting grooves are provided on the CCS bracket, the plurality of limiting grooves are arranged at intervals, and each limiting groove is clamped with the corresponding limiting step.

[0007] Furthermore, one end of each limiting groove extends along the width direction of the CCS bracket to the top of the CCS bracket, and the opening size of the limiting groove located at the top of the CCS bracket is larger than the opening size of the limiting groove near the bottom of the CCS bracket.

[0008] Furthermore, the water-cooled plate assembly includes: an exhaust crossbeam, which is located in the shell assembly, arranged along the length direction of the CCS assembly, has an exhaust cavity, and the surface of the exhaust crossbeam is in contact with the battery cell; a water-cooled plate, which is arranged adjacent to the exhaust crossbeam, and the surface of the water-cooled plate is in contact with the battery cell.

[0009] Furthermore, each exhaust beam includes: a first exhaust plate, the first exhaust plate is provided with a plurality of first exhaust holes, and the plurality of first exhaust holes are arranged at intervals; a second exhaust plate, the second exhaust plate is arranged opposite to the first exhaust plate, and the second exhaust plate is provided with a plurality of second exhaust holes, and the plurality of second exhaust holes are arranged at intervals; an airflow baffle plate, the airflow baffle plate is located between the first exhaust plate and the second exhaust plate, the airflow baffle plate is arranged parallel to the first exhaust plate and the second exhaust plate, one end of the first exhaust plate, one end of the second exhaust plate and one end of the airflow baffle plate are connected by a connecting plate, a first exhaust cavity among the plurality of exhaust cavities is formed between the first exhaust plate and the airflow baffle plate, and a second exhaust cavity among the plurality of exhaust cavities is formed between the second exhaust plate and the airflow baffle plate.

[0010] Furthermore, each CCS component also includes: a voltage sampling piece, which is located at one end close to the bottom of the CCS bracket, and the voltage sampling piece is arranged close to the limiting groove; a temperature sampling piece, which is located at one end close to the top of the CCS bracket; a low-voltage sampling piece, which is located between the voltage sampling piece and the temperature sampling piece, and the voltage sampling piece and the temperature sampling piece are respectively connected to the low-voltage sampling piece.

[0011] Furthermore, a first through hole for the pole to pass through is provided in each limiting groove, and a second through hole for the pole to pass through is provided on each pole clamping piece. The first through hole and the second through hole are arranged correspondingly, and a connecting copper busbar is provided between two adjacent limiting grooves, and the connecting copper busbar is located on the low-voltage sampling piece.

[0012] Furthermore, at least two battery modules include: multiple thermally conductive adhesives, multiple thermally conductive adhesives are located between multiple battery cells and multiple exhaust beams, and multiple thermally conductive adhesives are connected to the first exhaust plate or the second exhaust plate; multiple spacer thermal pads, multiple spacer thermal pads are located between multiple thermally conductive adhesives and multiple battery cells, one end of each spacer thermal pad is connected to the thermally conductive adhesive, and the other end of each spacer thermal pad is connected to the battery cell, and each spacer thermal pad is arranged with a certain thickness.

[0013] Furthermore, the shell assembly includes: a lower cover of the box; an upper cover of the box, which is located below the lower cover of the box; a box frame, which is arranged around the water-cooling plate assembly, and the lower cover of the box and the upper cover of the box are respectively connected to the box frame, and a water inlet and a water outlet are provided on the box frame, and the water inlet and the water outlet are arranged to be connected to the water-cooling plate.

[0014] Furthermore, multiple lower-layer thermal insulation buffer pads are provided between the lower cover of the box body and the multiple battery cells located below the water-cooled plate assembly, and multiple upper-layer thermal insulation buffer pads are provided between the upper cover of the box body and the multiple battery cells located above the water-cooled plate assembly.

[0015] According to another aspect of the present application, a vehicle is provided, the vehicle including a battery pack, and the battery pack is the battery pack described above.

[0016] By applying the technical solution of this application, by positioning the water-cooling plate assembly at the height center of the housing assembly, with a layer of cells above and below the water-cooling plate assembly, a single water-cooling plate assembly can achieve large-surface cooling, reducing the risk of leakage and lowering costs. Furthermore, the cell clip-on structure eliminates the need for welding between the cells and the CCS assembly, facilitating assembly and improving production line cycle time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings that constitute part of this application are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0018] FIG1 shows a schematic structural diagram of a first embodiment of a battery pack according to the present application;

[0019] FIG2 shows a schematic structural diagram of a battery cell of a battery pack according to a first embodiment of the present application;

[0020] FIG3 shows a schematic structural diagram of a first embodiment of a CCS assembly of a battery pack according to the present application;

[0021] FIG4 shows a schematic structural diagram of a second embodiment of a CCS assembly of a battery pack according to the present application;

[0022] FIG5 shows a schematic structural diagram of a third embodiment of a CCS assembly of a battery pack according to the present application;

[0023] FIG6 shows an enlarged schematic diagram of point A in FIG5 ;

[0024] FIG7 shows a first partial structural schematic diagram of a CCS assembly of a battery pack according to the present application;

[0025] FIG8 shows a second partial structural schematic diagram of the CCS assembly of the battery pack according to the present application;

[0026] FIG9 shows a schematic structural diagram of a first embodiment of an exhaust crossbeam of a battery pack according to the present application;

[0027] FIG10 shows a schematic structural diagram of a second embodiment of an exhaust crossbeam of a battery pack according to the present application;

[0028] FIG11 shows a schematic structural diagram of a water-cooling plate of a battery pack according to the present application.

[0029] The above drawings include the following reference numerals:

[0030] 1. CCS assembly; 101. Connecting copper busbar; 102. Voltage sampling piece; 103. Temperature sampling piece; 104. Low-voltage sampling piece; 105. CCS bracket; 1016. First via hole; 1017. Limiting groove;

[0031] 2. Battery cell; 201. Post connector; 2011. Positioning step; 2016. Second via;

[0032] 3. Spacer heat pad;

[0033] 4. Thermal conductive adhesive;

[0034] 5. Water cooling plate; 501. First exhaust hole; 502. Air flow baffle; 503. Second exhaust hole;

[0035] 6. Exhaust beam; 61. First exhaust plate; 62. Second exhaust plate; 63. First exhaust cavity; 64. Second exhaust cavity;

[0036] 7. Box cover; 8. Upper thermal insulation cushion; 9. Box frame;

[0037] 10. Water inlet; 11. Water outlet; 12. Lower thermal insulation cushion; 13. Lower cover of the box. DETAILED DESCRIPTION

[0038] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0039] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0040] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0041] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in a variety of different forms and should not be interpreted as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of this application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for the sake of clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0042] It should be noted that a water cooling plate is a heat dissipation device used in battery packs, primarily used to control and reduce the temperature of the battery pack. It is usually made of metal and has multiple small channels that circulate water or other cooling media to absorb and dissipate the heat generated in the battery pack.

[0043] In the battery pack, the functions of the water cooling plate are mainly as follows:

[0044] 1. Heat dissipation: Batteries generate a large amount of heat during operation. If heat is not dissipated in time, it may cause the battery to overheat, affecting its performance and lifespan. The water cooling plate absorbs the heat in the battery pack and quickly dissipates it by circulating cooling medium, effectively reducing the battery temperature.

[0045] 2. Temperature Balance: Different cells in a battery pack may have different temperatures, which can lead to uneven performance of the battery pack. A water-cooled plate evenly distributes the cooling medium, ensuring consistent temperatures across the cells, improving the overall performance and life of the battery pack.

[0046] 3. Safety protection: Excessively high battery temperatures may cause battery safety issues such as overheating, combustion, and explosion. The use of water cooling plates can effectively lower battery temperatures, reduce battery safety risks, and improve battery pack safety.

[0047] In general, the role of the water cooling plate in the battery pack is to effectively reduce the battery temperature, protect the battery performance and safety, and improve the service life and reliability of the battery pack.

[0048] 1 to 11 , a battery pack is provided according to a specific embodiment of the present application.

[0049] As shown in Figure 1, the battery pack includes: a shell assembly; a water-cooled plate assembly, which is arranged in the middle of the shell assembly along the height direction of the shell assembly; at least two battery modules, at least two battery modules are located in the shell, and one of the at least two battery modules is located on the first side of the water-cooled plate assembly, and the other of the at least two battery modules is located on the second side of the water-cooled plate assembly, the first side and the second side are arranged opposite to each other, and the at least two battery modules each include multiple battery cells 2 and multiple CCS assemblies 1, each CCS assembly 1 located on the first side of the water-cooled plate and the second side of the water-cooled plate is located on one side of the pole of each battery cell 2, and each CCS assembly 1 is clamped with each battery cell 2.

[0050] In this embodiment, by positioning the water-cooling plate assembly at the height center of the housing assembly, with a layer of cells 2 located above and below the water-cooling plate assembly, a single water-cooling plate assembly can achieve large-surface cooling, reducing the risk of leakage and lowering costs. Furthermore, the cell clip-on structure eliminates the need for welding between the cells and the CCS assembly 1, facilitating assembly and improving production line cycle time.

[0051] As shown in Figures 2, 3, 4, 5, and 6, at least two pole clips 201 are provided on one side of each battery cell 2. Each pole clip 201 is provided with a limiting step 2011. The height of the limiting step 2011 is set along the height direction of the pole clip 201. Each CCS assembly 1 includes a CCS bracket 105. The CCS bracket 105 is provided with a plurality of limiting grooves 1017. The plurality of limiting grooves 1017 are arranged at intervals, and each limiting groove 1017 is clamped with a corresponding limiting step 2011. Specifically, the pole clip 201 adopts a stepped design structure. The limiting step 2011 is designed on the pole clip 201 and cooperates with the limiting groove 1017 on the CCS assembly 1, making the assembly between the battery cell 2 and the CCS assembly simple and quick, saving costs.

[0052] As shown in Figures 7 and 8, one end of each retaining groove 1017 extends along the width direction of the CCS bracket 105 to the top of the CCS bracket 105, and the opening size of the retaining groove 1017 located at the top of the CCS bracket 105 is larger than the opening size of the retaining groove 1017 near the bottom of the CCS bracket 105. Specifically, the retaining groove 1017 of the present application adopts a gradually expanding design, with the opening size at the top being larger than the opening size at the bottom, to facilitate the matching of the pole clamp 201 with the CCS bracket 105.

[0053] As shown in Figures 9 and 11, the water-cooled plate assembly includes: an exhaust beam 6, located within the housing assembly and extending along the length of the CCS assembly 1. The exhaust beam 6 defines an exhaust cavity, and its surface contacts the battery cells 2. A water-cooled plate 5 is positioned adjacent to the exhaust beam 6, with its surface contacting the battery cells 2. This arrangement prevents thermal runaway in other cells by utilizing the coolant flow path within the cooling plate if one battery cell experiences thermal runaway.

[0054] As shown in Figure 10, each exhaust cross beam 6 includes: a first exhaust plate 61, on which a plurality of first exhaust holes 501 are provided, and the plurality of first exhaust holes 501 are arranged at intervals; a second exhaust plate 62, which is arranged opposite to the first exhaust plate 61, and on which a plurality of second exhaust holes 503 are provided, and the plurality of second exhaust holes 503 are arranged at intervals; an airflow baffle plate 502, which is located between the first exhaust plate 61 and the second exhaust plate 62, and the airflow baffle plate 502 is arranged parallel to the first exhaust plate 61 and the second exhaust plate 62, one end of the first exhaust plate 61, one end of the second exhaust plate 62 and one end of the airflow baffle plate 502 are connected by a connecting plate, a first exhaust cavity 63 among the plurality of exhaust cavities is formed between the first exhaust plate 61 and the airflow baffle plate, and a second exhaust cavity 64 among the plurality of exhaust cavities is formed between the second exhaust plate 62 and the airflow baffle plate 502. In this way, by setting a water cooling plate in the exhaust cavity of the exhaust beam, the upper and lower layers of battery cells can be cooled without interfering with each other.

[0055] As shown in Figures 3 and 4, each CCS assembly 1 further includes: a voltage sampling piece 102, which is located at one end near the bottom of the CCS bracket 105 and is arranged near the limiting groove 1017; a temperature sampling piece 103, which is located at one end near the top of the CCS bracket 105; and a low-voltage sampling piece 104, which is located between the voltage sampling piece 102 and the temperature sampling piece 103, and the voltage sampling piece 102 and the temperature sampling piece 103 are respectively connected to the low-voltage sampling piece. This arrangement is simple in structure and saves space.

[0056] As shown in Figures 2 and 7, each limiting groove 1017 is provided with a first through-hole 1016 for the pole to pass through, and each pole clamping piece 201 is provided with a second through-hole 2016 for the pole to pass through. The first through-hole 1016 and the second through-hole 2016 are provided correspondingly, and a connecting copper bar 101 is provided between two adjacent limiting grooves 1017. The connecting copper bar 101 is located on the low-voltage sampling piece 104. The power cell pole is passed through the first through-hole 1016 on the limiting groove 1017 and the second through-hole 2016 on the pole clamping piece 201, thereby connecting the battery cell to the CCS assembly.

[0057] As shown in Figure 1, at least two battery modules each include: multiple thermally conductive adhesives 4 positioned between the battery cells 2 and the exhaust beams 6, each connected to the first exhaust plate 61 or the second exhaust plate 62; and multiple thermal spacers 3 positioned between the thermally conductive adhesives 4 and the battery cells 2, with one end of each thermal spacer 3 connected to the thermally conductive adhesive 4 and the other end connected to the battery cells 2. Each thermal spacer 3 is arranged with a certain thickness. The thermally conductive adhesive 4 is a material with excellent thermal conductivity that helps heat within the battery pack quickly transfer to heat dissipation components, such as heat sinks or radiators. By improving heat conduction efficiency, the thermally conductive adhesive 4 can effectively reduce the temperature of the battery pack, thereby improving battery efficiency and lifespan. The thermal spacers 3 are generally made of insulating material. Their primary function is to prevent heat from the battery from being transferred outward and to protect the external environment of the battery pack from the high temperature of the battery. The thermal spacers 3 provide thermal insulation for the battery pack, preventing overheating and reducing the impact of the battery pack temperature on the surrounding environment. In summary, thermal conductive adhesive helps quickly conduct heat within the battery pack, improving heat dissipation, while thermal insulation pads prevent heat from escaping, protecting the battery and the surrounding environment. Both settings help improve the efficiency and safety of the battery pack.

[0058] The housing assembly further includes: a lower housing cover 13; an upper housing cover 7, which is located below the lower housing cover 13; and a housing frame 9, which surrounds the water-cooling plate assembly. The lower housing cover 13 and the upper housing cover 7 are respectively connected to the housing frame 9. The housing frame 9 is provided with a water inlet 10 and a water outlet 11, which are arranged to communicate with the water-cooling plate 5. The housing frame 9 protects the water-cooling plate assembly, preventing it from being accidentally touched or damaged by external objects or people. The housing frame 9 firmly secures the water-cooling plate assembly within the housing, preventing it from moving or falling off during transportation or use. The housing frame 9 guides the water-cooling plate assembly, ensuring proper installation within the housing and ensuring a precise fit between the water-cooling plate assembly and the housing. The housing frame 9 increases the heat dissipation surface area of ​​the water-cooling plate assembly, improving heat dissipation and ensuring the stability and reliability of the water-cooling plate assembly during operation. The box frame 9 can isolate the water-cooling plate assembly from the external environment, preventing the water-cooling plate assembly from being affected by external dust, moisture, etc. In short, the box frame is set around the water-cooling plate assembly to protect, fix, guide, dissipate heat, and isolate the water-cooling plate assembly, ensuring its normal operation and service life.

[0059] Furthermore, a plurality of lower-layer thermal insulation cushion pads 12 are provided between the lower cover 13 of the box body and the plurality of battery cells 2 located below the water-cooled plate assembly, and a plurality of upper-layer thermal insulation cushion pads 8 are provided between the upper cover 7 of the box body and the plurality of battery cells 2 located above the water-cooled plate assembly. An upper-layer thermal insulation cushion pad 8 is arranged on the upper part of the upper-layer battery cell, and its function is two-fold. First, when the battery is normally charged and discharged, the battery cell will swell, and the upper-layer thermal insulation cushion pad 8 absorbs the swelling and deformation of the battery cell. On the other hand, because the battery pack has a need to be kept warm in low or high temperature environments, the upper-layer thermal insulation cushion pad 8 has a porous structure, which can suppress heat exchange between the inside and outside of the battery pack. Similarly, a lower-layer thermal insulation cushion pad 12 is arranged on the lower-layer battery cell.

[0060] According to another aspect of the present application, a vehicle is provided, comprising a battery pack, which is the battery pack described above. The battery pack comprises: a housing assembly; a water-cooling plate assembly, the water-cooling plate assembly being disposed in the middle of the housing assembly along the height direction of the housing assembly; and at least two battery modules, both of which are located within the housing, with one of the at least two battery modules being located on a first side of the water-cooling plate assembly and the other of the at least two battery modules being located on a second side of the water-cooling plate assembly, the first side being disposed opposite the second side, and the at least two battery modules each comprising a plurality of battery cells 2 and a plurality of CCS assemblies 1, with each CCS assembly 1 located on the first side and the second side of the water-cooling plate being located on one side of a pole of each battery cell 2, and each CCS assembly 1 being snap-fitted to each battery cell 2. In this embodiment, by disposing the water-cooling plate assembly at the center of the height direction of the housing assembly, a layer of battery cells 2 is provided on the upper and lower sides of the water-cooling plate assembly, allowing a single water-cooling plate assembly to achieve large-surface cooling, thereby reducing the risk of leakage and lowering costs. At the same time, the battery cell clip-on structure is adopted, which eliminates the need for welding between the battery cell and the CCS assembly 1, facilitates assembly, and improves the production line rhythm.

[0061] The large surface of the battery cell is perpendicular to the height direction of the entire package, and the entire package of battery cells is divided into two layers, upper and lower, to achieve large-surface cooling. The water-cooling plate is arranged in the center of the height direction of the battery box frame. The large surface of the battery cell is in close contact with the water-cooling plate, which increases the heat dissipation area of ​​the battery cell to meet the cooling needs during super-fast charging. When thermal runaway occurs, it can also prevent heat from being transferred to other battery cells through the large surface of the battery cell. At the same time, when thermal runaway occurs, the battery circuit cooling water pump is started, and the coolant in the water-cooling plate circulates. Through convection heat transfer, the heat of the runaway battery cell is dissipated, the temperature of the runaway battery cell is reduced, and the risk of thermal runaway in other battery cells is further reduced. Insulation pads are arranged on the sides of the battery cell to prevent heat from being transferred to other battery cells through the sides of the battery.

[0062] The battery case frame and water-cooling plate are integrated into the design, eliminating the need for a water-cooling plate within the battery pack and reducing the risk of leakage. The water-cooling plate provides thermal insulation, enhancing battery cell safety. The battery case consists of a frame, upper and lower covers, with an upper insulation cushion between the upper cells and the upper cover, and a lower insulation cushion between the lower cells and the lower cover. Thermal insulation pads are located on the sides of the batteries to prevent heat dissipation.

[0063] For complete assembly, the battery case is divided into three parts: the frame, the upper cover, and the lower cover. The assembly sequence is to attach the water cooling plate to the frame, then assemble the upper cells and their components, weld the upper CCS layer vertically, then assemble the upper insulation cushion and the upper cover. The entire pack is then flipped over. Next, assemble the lower cells and their components, weld the lower CCS layer vertically, then assemble the lower insulation cushion, and finally the lower cover and the upper cover.

[0064] When thermal runaway occurs, thermal insulation protection is achieved by using a water-cooled plate in the large surface direction and a thermal insulation pad on the side direction of the battery cell. When thermal runaway occurs, the battery pack's cooling system is activated to allow the coolant in the water-cooled plate to flow, and convection heat is used to remove the heat. Through the combined application of thermal insulation and heat dissipation measures, the temperature of the battery cell that is not out of control is controlled below the runaway threshold to prevent heat diffusion.

[0065] This application innovates the whole package layout, with the large surface of the battery cell perpendicular to the height direction of the vehicle, and the whole package of battery cells is divided into two layers, upper and lower, to achieve large-surface cooling. In order to achieve this design, a battery cell clip-on design is invented to improve the manufacturability of the whole package assembly.

[0066] Beneficial effects of this application:

[0067] (1) At the same time, the box and the water cooling plate adopt an integrated design, so there is no water cooling joint in the battery pack, reducing the risk of leakage.

[0068] (2) This application reduces the number of water-cooling plates and the number of water-cooling joints in the battery pack, thereby reducing costs.

[0069] (3) Heat insulation is provided by water cooling plates to improve the safety of the battery cells. The battery box is divided into a frame, an upper cover and a lower cover. There is an upper heat insulation cushion between the upper battery cells and the upper cover, and a lower heat insulation cushion between the lower battery cells and the lower cover. There are heat insulation cushions on the sides of the battery to prevent heat diffusion.

[0070] (4) Compared with the traditional bottom surface cooling solution, this application adopts large surface cooling, which is more conducive to fast charging and heat dissipation.

[0071] (5) The connection between the battery cells of this application adopts a unique clip-on structure, which does not require welding and improves the assembly performance of the production line.

[0072] (6) The connection between the battery cells of this application does not require welding, which improves the convenience of maintenance.

[0073] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0074] In addition to the above, it should be noted that references to "one embodiment," "another embodiment," "an embodiment," and the like in this specification refer to specific features, structures, or characteristics described in conjunction with that embodiment as included in at least one embodiment generally described in this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in conjunction with any embodiment, it is intended that such feature, structure, or characteristic, when implemented in conjunction with other embodiments, also fall within the scope of this application.

[0075] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0076] The foregoing description is merely a preferred embodiment of the present application and is not intended to limit the present application. Persons skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery pack, characterized in that: include: Shell assembly; A water-cooling plate assembly, wherein the water-cooling plate assembly is arranged in the middle of the shell assembly along the height direction of the shell assembly; At least two battery modules, at least two of the battery modules are located in the shell, and one of the at least two battery modules is located on the first side of the water-cooled plate assembly, and the other of the at least two battery modules is located on the second side of the water-cooled plate assembly, the first side and the second side are arranged opposite to each other, at least two of the battery modules each include a plurality of battery cells (2) and a plurality of CCS assemblies (1), each of the CCS assemblies (1) located on the first side of the water-cooled plate and the second side of the water-cooled plate is located on one side of a pole of each of the battery cells (2), and each of the CCS assemblies (1) is snap-fitted to each of the battery cells (2).

2. The battery pack according to claim 1, characterized in that: At least two pole clamping parts (201) are provided on one side of each battery cell (2), and each pole clamping part (201) is provided with a limiting step (2011), and the height of the limiting step (2011) is arranged along the height direction of the pole clamping part (201), and each CCS assembly (1) comprises: A CCS bracket (105), wherein a plurality of limiting grooves (1017) are provided on the CCS bracket (105), wherein the plurality of limiting grooves (1017) are arranged at intervals, and each of the limiting grooves (1017) is engaged with a corresponding limiting step (2011).

3. The battery pack according to claim 2, characterized in that: One end of each of the limiting grooves (1017) extends along the width direction of the CCS bracket (105) to the top of the CCS bracket (105), and an opening size of the limiting groove (1017) located at the top of the CCS bracket (105) is larger than an opening size of the limiting groove (1017) close to the bottom of the CCS bracket (105).

4. The battery pack according to claim 2, characterized in that: The water cooling plate assembly comprises: an exhaust crossbeam (6), the exhaust crossbeam (6) being located in the housing assembly, the exhaust crossbeam (6) being arranged along the length direction of the CCS assembly (1), the exhaust crossbeam (6) having an exhaust cavity, and the surface of the exhaust crossbeam (6) being in contact with the battery cell (2); A water cooling plate (5), the water cooling plate (5) being arranged adjacent to the exhaust cross beam (6), and the surface of the water cooling plate (5) being in contact with the battery core (2).

5. The battery pack according to claim 4, characterized in that: Each of the exhaust cross beams (6) comprises: A first exhaust plate (61), wherein a plurality of first exhaust holes (501) are provided on the first exhaust plate, and the plurality of first exhaust holes (501) are arranged at intervals; a second exhaust plate (62), the second exhaust plate (62) being arranged opposite to the first exhaust plate (61), the second exhaust plate (62) being provided with a plurality of second exhaust holes (503), the plurality of second exhaust holes (503) being arranged at intervals; An airflow baffle plate (502), the airflow baffle plate (502) being located between the first exhaust plate (61) and the second exhaust plate (62), the airflow baffle plate (502) being arranged parallel to the first exhaust plate (61) and the second exhaust plate (62), at least one end of the first exhaust plate (61), at least one end of the second exhaust plate (62) and at least one end of the airflow baffle plate (502) being connected via a connecting plate, a first exhaust cavity (63) among a plurality of exhaust cavities being formed between the first exhaust plate (61) and the airflow baffle plate (502), and a second exhaust cavity (64) among a plurality of exhaust cavities being formed between the second exhaust plate (62) and the airflow baffle plate (502).

6. The battery pack according to claim 5, characterized in that: Each of the CCS components (1) further comprises: A voltage sampling piece (102), the voltage sampling piece (102) being located at one end close to the bottom of the CCS bracket (105), and the voltage sampling piece (102) being arranged close to the limiting groove (1017); A temperature sampling piece (103), the temperature sampling piece (103) being located at one end close to the top of the CCS bracket (105); A low-voltage sampling piece (104), the low-voltage sampling piece (104) is located between the voltage sampling piece (102) and the temperature sampling piece (103), and the voltage sampling piece (102) and the temperature sampling piece (103) are respectively connected to the low-voltage sampling piece.

7. The battery pack according to claim 6, characterized in that: A first through hole (1016) for a pole to pass through is arranged in each of the limiting grooves (1017), and a second through hole (2016) for the pole to pass through is arranged on each of the pole clamping parts (201), the first through hole (1016) and the second through hole (2016) are arranged correspondingly, and a connecting copper bus (101) is arranged between two adjacent limiting grooves (1017), and the connecting copper bus (101) is located on the low-voltage sampling sheet (104).

8. The battery pack according to claim 6, characterized in that: At least two of the battery modules include: A plurality of heat-conducting adhesives (4), the plurality of heat-conducting adhesives (4) being located between the plurality of battery cells (2) and the plurality of exhaust beams (6), and the plurality of heat-conducting adhesives (4) being connected to the first exhaust plate (61) or the second exhaust plate (62); A plurality of spacer thermal pads (3), wherein the plurality of spacer thermal pads (3) are located between the plurality of thermally conductive adhesives (4) and the plurality of battery cells (2), one end of each of the spacer thermal pads (3) is connected to the thermally conductive adhesive (4), and the other end of each of the spacer thermal pads (3) is connected to the battery cell (2), and each of the spacer thermal pads (3) is arranged with a certain thickness.

9. The battery pack according to claim 6, characterized in that: The housing assembly comprises: Box lower cover (13); A box upper cover (7), the box upper cover (7) being located below the box lower cover (13); A box frame (9), the box frame (9) is arranged around the water cooling plate assembly, the box lower cover (13) and the box upper cover (7) are respectively connected to the box frame (9), and the box frame (9) is provided with a water inlet (10) and a water outlet (11), and the water inlet (10) and the water outlet (11) are arranged to communicate with the water cooling plate (5).

10. The battery pack according to claim 9, characterized in that: A plurality of lower thermal insulation cushion pads (12) are provided between the box body lower cover (13) and the plurality of battery cells (2) located below the water cooling plate assembly, and a plurality of upper thermal insulation cushion pads (8) are provided between the box body upper cover (7) and the plurality of battery cells (2) located above the water cooling plate assembly.

11. A vehicle, characterized in that: The vehicle includes a battery pack, and the battery pack is the battery pack according to any one of claims 1 to 10.

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