Battery pack and electric device

Abstract

The application relates to the technical field of batteries, and provides a battery pack and a power utilization device. The battery pack provided by the application comprises a cold plate and a battery cell module arranged on the cold plate. The battery cell module comprises end battery cells and end plates arranged in sequence along the length direction of the battery cell module, an output pole conductive row arranged on the end plates, and a connecting row connecting the pole columns of the end battery cells and the output pole conductive row. The end plates are provided with end plate flow channels in communication with the flow channels of the cold plate, at least part of the end plate flow channels correspond to the output pole conductive row, and the connecting area Q of the output pole conductive row and the connecting row is arranged. The battery pack provided by the application can reduce the temperature of the position of the pole columns of the end battery cells, solve the problem that the fast charging rate is restricted by the temperature of the end battery cells, and thus facilitate the improvement of the fast charging rate of the battery pack.

Description

Technical Field

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

[0002] Currently, both complete vehicles and battery packs are developing towards higher voltage and faster charging rates, which places higher demands on the heat dissipation of battery cells and electrical connectors. Specifically, the output terminals of the end cells in the battery pack are usually connected to the output terminal copper busbar via a shaped aluminum busbar, and the end of the output terminal copper busbar furthest from the shaped aluminum busbar is connected to electrical components such as the BDU (Battery Duct Unit).

[0003] However, the heat generated by the irregularly shaped aluminum busbar and the output copper busbar increases rapidly under high current, which seriously affects the temperature of the end cell terminal connected to the irregularly shaped aluminum busbar and restricts the improvement of the fast charging rate of the cell and battery pack. Utility Model Content

[0004] In view of this, this application aims to provide a battery pack that can improve the fast charging rate.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows: A battery pack includes a cold plate and a cell module disposed on the cold plate: The battery cell module includes end cells and end plates arranged sequentially along the length of the battery cell module, an output electrode busbar disposed on the end plate, and a connection bar connecting the end cell terminals and the output electrode busbar. The end plate is provided with an end plate flow channel that communicates with the flow channel of the cold plate, and at least a portion of the end plate flow channel corresponds to the output electrode busbar, and a connection area Q is provided between the output electrode busbar and the connection busbar.

[0006] Furthermore, the connecting bus includes a first connecting portion connecting the end cell terminal post and a second connecting portion connecting the output electrode conductive bus, and the projections of the second connecting portion and the output electrode conductive bus in the length direction of the cell module at least partially overlap.

[0007] Furthermore, the end plate flow channel includes a first cooling flow channel corresponding to the output electrode busbar, a second cooling flow channel corresponding to the end cell electrode post, and a third cooling flow channel corresponding to the second connection portion; the second cooling flow channel and the third cooling flow channel are arranged in parallel, and along the length direction of the cell module, the second cooling flow channel is located between the end cell and the third cooling flow channel.

[0008] Further, along the length direction of the battery cell module, the first cooling flow channel is spaced from the end battery cells; and / or, along the width direction of the battery cell module, at least a part of the first connection part is arranged corresponding to the second cooling flow channel and the third cooling flow channel.

[0009] Further, along the width direction of the battery cell module, the output pole busbar penetrates through the end plate, and the part of the output pole busbar located in the end plate is immersed in the first cooling flow channel; and / or, along the width direction of the battery cell module, the projected profile of the first cooling flow channel is in a shape of a Chinese character 'hui'.

[0010] Further, an inward concave mounting groove is provided on the end plate. Along the length direction of the battery cell module, the mounting groove is located on the side of the end plate away from the end battery cells; the second connection part is located in the mounting groove, and both the second cooling flow channel and the third cooling flow channel are arranged corresponding to the mounting groove.

[0011] Further, both the second cooling flow channel and the third cooling flow channel are arranged along the height direction of the battery cell module, and along the width direction of the battery cell module, the second cooling flow channel and / or the third cooling flow channel include a plurality of shunt channels which are sequentially spaced and in parallel.

[0012] Further, along the width direction of the battery cell module, the width H1 of the second cooling flow channel satisfies: 30mm ≤ H1 ≤ 40mm; and / or, along the width direction of the battery cell module, the width H2 of the third cooling flow channel satisfies: 30mm ≤ H2 ≤ 40mm.

[0013] Further, a heat-conducting insulating pad is provided between the second connection part and the end plate; and / or, a heat-conducting insulating layer is coated on the output pole busbar.

[0014] Compared with the related art, the present application has the following advantages: (1) For the battery pack of the present application, by arranging at least a part of the end plate flow channel corresponding to the output pole busbar and the connection area Q between the output pole busbar and the connection busbar, the output pole busbar and the connection area Q between the output pole busbar and the connection busbar can be cooled. Furthermore, by reducing the output pole busbar and the connection busbar, the temperature at the position of the end battery cell pole can be reduced, so as to solve the problem that the fast charging rate is restricted by the temperature of the end battery cells, and thus the requirement for increasing the fast charging rate of the battery pack can be met.

[0015] (2) The connection row includes a first connection part and a second connection part, facilitating the connection of the connection row to the end cell and the output pole conductive row. Moreover, the projections of the second connection part and the output pole conductive row in the length direction of the cell module at least partially overlap, which can help increase the connection area between the connection row and the output pole conductive row, thereby enhancing the connection reliability.

[0016] (3) Through the settings of the first cooling channel, the second cooling channel, and the third cooling channel, the output pole conductive row, the end cell pole column, and the connection row can be cooled respectively, improving the overall cooling effect. At the same time, the second cooling channel and the third cooling channel are arranged in parallel. On the one hand, it can achieve targeted cooling of the end cell pole column and the connection row. On the other hand, it can reduce the cross-sectional area of the channel, increase the flow rate of the coolant, and enhance the heat exchange capacity of the channel.

[0017] (4) Along the length direction of the cell module, the distance between the first cooling channel and the end cell is set to avoid the large surface contact between the first cooling channel and the end cell, which may lead to a lower temperature of the end cell and a larger temperature difference with other cells, ultimately affecting the overall temperature control effect. At the same time, along the width direction of the cell module, at least part of the first connection part corresponds to the second cooling channel and the third cooling channel, enabling the cooling of the first connection part. Based on cooling the second connection part, the overall cooling effect of the connection row can be improved.

[0018] (5) The part of the output pole conductive row located in the end plate is immersed in the first cooling channel, which can improve the cooling effect on the output pole conductive row. And along the width direction of the cell module, the projection profile of the first cooling channel is in the shape of a "return" character, which can avoid an overly large cross-section of the first cooling channel, increase the flow rate of the coolant, and enhance the heat exchange capacity of the coolant.

[0019] (6) By setting the installation groove, the space utilization rate along the length direction of the cell module can be improved, which is conducive to enhancing the overall energy density of the battery pack.

[0020] (7) Both the second cooling channel and the third cooling channel include a plurality of shunt channels that are spaced in sequence and arranged in parallel, which can reduce the cross-sectional area of the channel, increase the flow rate of the coolant, and enhance the heat exchange capacity of the coolant.

[0021] (8) Along the width direction of the cell module, the width H1 of the second cooling channel and the width H2 of the third cooling channel are both between 30 mm and 40 mm. This can ensure that the cooling areas of the second cooling channel and the third cooling channel cover the second connection part while also cooling the output pole part of the end cell, avoiding cooling the entire large surface of the end cell and preventing a too large temperature difference between the end cell and other cells with only bottom cooling.

[0022] (9) By setting a thermally conductive insulating pad, the heat exchange efficiency between the second connection part and the end plate can be improved.

[0023] This application also proposes an electrical device, which includes a battery pack as described above.

[0024] The electrical device described in this application is equipped with the aforementioned battery pack, which has the same beneficial effects as conventional technology, and will not be described in detail here. Attached Figure Description

[0025] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the battery pack described in the embodiments of this application; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 This is a simplified structural diagram of the endplate flow channel described in the embodiments of this application; Figure 4 This is a schematic diagram of the endplate flow channel structure described in an embodiment of this application; Figure 5 for Figure 4 A schematic diagram of the structure shown from another perspective; Explanation of reference numerals in the attached figures: 100. Cold-rolled steel plate; 101. Inlet pipe; 102. Outlet pipe; 200. Battery cell module; 201. End cell; 202. End plate; 2021. First cooling channel; 2022. Second cooling channel; 2023. Third cooling channel; 2024. Mounting slot; 2025. Connecting channel; 2026. Liquid inlet channel; 2027. Liquid outlet channel; 203. Output electrode busbar; 2031. Thermally conductive insulating layer; 204. Connecting busbar; 2041. First connecting part; 2042. Second connecting part; 205. Cell busbar; 300, thermally conductive insulating pad; 400, sealing ring; 500, BDU. Detailed Implementation

[0026] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0028] Furthermore, it should be noted that in the description of this application, if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, these are 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 on this application. In addition, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] Furthermore, in the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application in light of the specific circumstances.

[0030] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0031] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0032] An embodiment of the first aspect of this application provides a battery pack that can solve the problem that the fast charging rate is limited by the temperature of the end cell 201, thereby improving the fast charging rate of the entire pack.

[0033] In related technologies, both the vehicle and the battery pack are moving towards higher voltage and faster charging rates, which places higher demands on the heat dissipation of the cells and electrical connectors. Specifically, the output terminal of the end cell 201 in the battery pack is usually connected to the output terminal copper busbar through a shaped aluminum busbar, and the end of the output terminal copper busbar away from the shaped aluminum busbar is connected to electrical components such as the BDU (Battery Disconnect Unit or High Voltage Distribution Box) 500.

[0034] For traditional low-current charging battery packs, the heat generated by the irregularly shaped aluminum busbar and the output copper busbar has a relatively small impact on the terminal cell 201 due to the smaller fast charging current, and can be disregarded. However, when the charging current of the battery pack increases to 600-1000A or even higher, testing and simulation analysis show that under fast charging conditions, the heat generated by the irregularly shaped aluminum busbar and the output copper busbar (the welding resistance between the output copper busbar and the irregularly shaped aluminum busbar is the main cause of the high temperature of the terminal cell 201) results in the highest temperature of the output terminal of the terminal cell 201 being about 10-15°C higher than the highest temperature of cells in other conventional locations in the battery pack, severely restricting the improvement of the fast charging rate.

[0035] Therefore, the heat generated by the irregular aluminum busbar and the output copper busbar will increase rapidly under high current, which will seriously affect the temperature of the end cell 201 terminal connected to the irregular aluminum busbar and restrict the improvement of the fast charging rate of the cell and battery pack.

[0036] In view of this, in order to overcome the shortcomings of the related technology, the battery pack of this embodiment combines... Figures 1 to 5 As shown, the overall design includes a cold plate 100 and a battery cell module 200 disposed on the cold plate 100.

[0037] The battery module 200 includes end cells 201 and an end plate 202 arranged sequentially along the length of the battery module 200, an output electrode conductive bus 203 disposed on the end plate 202, and a connecting bus 204 connecting the terminals of the end cells 201 and the output electrode conductive bus 203. Furthermore, the end plate 202 has an end plate flow channel communicating with the flow channel of the cold plate 100, and at least a portion of the end plate flow channel corresponds to the output electrode conductive bus 203, and a connection area Q is provided between the output electrode conductive bus 203 and the connecting bus 204.

[0038] Therefore, by setting at least a portion of the end plate flow channels corresponding to the output electrode conductive bus 203 and the connection area Q between the output electrode conductive bus 203 and the connection bus 204, heat dissipation can be achieved for the output electrode conductive bus 203 and the connection area Q between the output electrode conductive bus 203 and the connection bus 204. In turn, by reducing the output electrode conductive bus 203 and the connection bus 204, the temperature at the terminal post of the end cell 201 can be reduced, thereby solving the problem that the fast charging rate is limited by the temperature of the end cell 201, and thus meeting the requirement to improve the fast charging rate of the battery pack.

[0039] Meanwhile, the end plate flow channel is directly connected to the flow channel of the cold plate 100, which allows the end plate flow channel to be integrated into the liquid cooling system of the battery pack in the form of a branch flow channel. This eliminates the need to build a separate cooling system, which simplifies the overall cooling structure of the battery pack and the temperature control strategy, thereby achieving cost reduction.

[0040] Based on the above overview, specifically, the irregular aluminum busbar in the aforementioned related technologies refers to the connection busbar 204 in this embodiment, and the output electrode copper busbar refers to the output electrode conductive busbar 203 in this embodiment. In this embodiment, in addition to the end battery cell 201, the battery cell module 200 also includes several conventional battery cells arranged in a square sequence along the length of the battery cell module 200, and adjacent conventional battery cells are connected by a battery cell busbar 205.

[0041] Furthermore, there are typically two end cells 201, with one end cell 201 having a positive output terminal and the other end cell 201 having a negative output terminal. The two end cells 201 correspond to the aforementioned end plate 202, end plate flow channel, connecting bus 204, and output electrode conductive bus 203, etc. Therefore, Figure 1 Only a portion of the battery module 200 and one end battery cell 201 are shown for illustration purposes; further details will not be provided below.

[0042] Continue to combine Figure 1 and Figure 2 As shown, in some exemplary embodiments, the connection bus 204 includes a first connection portion 2041 for connecting the end cell 201 pole and a second connection portion 2042 for connecting the output electrode bus 203, and the projections of the second connection portion 2042 and the output electrode bus 203 in the length direction of the cell module 200 at least partially overlap.

[0043] It is understood that the connection bar 204 includes a first connection portion 2041 and a second connection portion 2042, which facilitates the connection of the end cell 201 and the output electrode conductive bar 203. Furthermore, the projections of the second connection portion 2042 and the output electrode conductive bar 203 in the length direction of the cell module 200 at least partially overlap, which can help increase the connection area between the connection bar 204 and the output electrode conductive bar 203, thereby improving the connection reliability.

[0044] In specific implementation, the first connecting portion 2041 and the second connecting portion 2042 are integrally formed, making the connecting bus 204 visually "L"-shaped, thus better adapting to the connecting end cell 201 and the output electrode conductive bus 203. Furthermore, the first connecting portion 2041 is connected to the terminal post of the end cell 201, and the second connecting portion 2042 is welded to the output electrode conductive bus 203 to form an electrical connection between the end cell 201 and the output electrode conductive bus 203.

[0045] Continue to combine Figures 1 to 5As shown, in some exemplary embodiments, the end plate flow channels include a first cooling flow channel 2021 corresponding to the output electrode bus 203, a second cooling flow channel 2022 corresponding to the terminal post of the end cell 201, and a third cooling flow channel 2023 corresponding to the second connection portion 2042. Furthermore, the second cooling flow channel 2022 and the third cooling flow channel 2023 are arranged in parallel, and along the length direction of the cell module 200, the second cooling flow channel 2022 is located between the end cell 201 and the third cooling flow channel 2023.

[0046] With this configuration, the output electrode busbar 203, the terminal cell 201 electrode post, and the connecting busbar 204 can be cooled separately through the first cooling channel 2021, the second cooling channel 2022, and the third cooling channel 2023, thereby improving the overall cooling effect. At the same time, the second cooling channel and the third cooling channel 2023 are connected in parallel, which can achieve targeted cooling of the output electrode of the terminal cell 201 and the connecting busbar 204, and reduce the cross-sectional area of ​​the channels, increase the coolant flow rate, and enhance the heat exchange capacity of the channels.

[0047] Furthermore, continue to combine Figures 1 to 3 As shown, in some exemplary embodiments, the distance between the first cooling channel 2021 and the end cell 201 along the length of the cell module 200 can prevent the first cooling channel 2021 from making large-area contact with the end cell 201, which would result in the end cell 201 having a lower temperature and a larger temperature difference with other cells, ultimately affecting the overall temperature control effect.

[0048] Meanwhile, in some exemplary embodiments, at least a portion of the first connection portion 2041 is provided along the width direction of the cell module 200, corresponding to the second cooling channel 2022 and the third cooling channel 2023. This allows for cooling of the first connection portion 2041, and, in addition to cooling the second connection portion 2042, improves the overall cooling effect of the connection busbar 204.

[0049] That is, the second cooling channel 2022 and the third cooling channel 2023 simultaneously cool the first connecting portion 2041 and the second connecting portion 2042 of the connecting busbar 204, which can achieve a better cooling effect on the connecting busbar 204 and the connection area Q between the output electrode conductive busbar 203 and the connecting busbar 204.

[0050] In addition, continue to combine Figures 1 to 3As shown in [reference], in some exemplary embodiments, along the width direction of the battery cell module 200, the output pole busbar 203 penetrates through the end plate 202, and the part of the output pole busbar 203 located in the end plate 202 is immersed in the first cooling channel 2021, which can form immersion cooling, increasing the cooling area of the output pole busbar 203 and thus enhancing the cooling effect.

[0051] Furthermore, in some exemplary embodiments, along the width direction of the battery cell module 200, the projection profile of the first cooling channel 2021 is in the shape of a "hui" character. The main advantage of this setting is that it can prevent the cross-section of the first cooling channel 2021 from being too large, increase the flow rate of the coolant, and enhance the heat transfer capacity of the coolant.

[0052] Continuing to refer to Figure 1 and Figure 3 As shown in [reference], in some exemplary embodiments, the end plate 202 is provided with a concave mounting groove 2024, and along the length direction of the battery cell module 200, the mounting groove 2024 is located on the side of the end plate 202 away from the battery cells of the end plate 202.

[0053] Moreover, the second connection part 2042 is located in the mounting groove 2024, and both the second cooling channel 2022 and the third cooling channel 2023 are correspondingly arranged with respect to the mounting groove 2024. Here, by providing the concave mounting groove 2024, the space utilization rate along the length direction of the battery cell module 200 can be improved, which is beneficial to the improvement of the overall energy density of the battery pack.

[0054] In addition, continuing to refer to Figure 3 As shown in [reference], in some exemplary embodiments, both the second cooling channel 2022 and the third cooling channel 2023 are arranged along the height direction of the battery cell module 200, and along the width direction of the battery cell module 200, the second cooling channel 2022 and the third cooling channel 2023 include a plurality of shunt channels that are sequentially spaced apart and connected in parallel.

[0055] Setting both the second cooling channel 2022 and the third cooling channel 2023 as a structural form of a plurality of shunt channels that are sequentially spaced apart and connected in parallel can reduce the cross-section of the channels, increase the flow rate of the coolant, and enhance the heat transfer capacity of the coolant.

[0056] Of course, when necessary in this embodiment, according to the cooling requirements for the pole positions of the end battery cells 201 and the second connection part 2042, only the second cooling channel 2022 can be set as a plurality of shunt channels that are sequentially spaced apart and connected in parallel, or only the third cooling channel 2023 can be set as a plurality of shunt channels that are sequentially spaced apart and connected in parallel.

[0057] During specific implementation, continuing to refer to Figure 5As shown, in some exemplary embodiments, along the width direction of the cell module 200, the width H1 of the second cooling channel 2022 satisfies: 30mm ≤ H1 ≤ 40mm, and the width H2 of the third cooling channel 2023 also satisfies: 30mm ≤ H2 ≤ 40mm. For example, H1 and H2 can specifically take values ​​of 30mm, 35mm, or 40mm, etc.

[0058] The main advantage of this arrangement is that it allows the cooling areas of the second cooling channel 2022 and the third cooling channel 2023 to cover the second connection portion 2042, while also cooling the terminal post (i.e., output terminal) of the end cell 201. This avoids cooling the entire surface of the end cell 201, preventing excessive temperature differences between the end cell 201 and other cells that are only cooled at the bottom, which could affect the improvement of the charging rate.

[0059] In addition, continue to combine Figure 2 As shown, in some exemplary embodiments, a thermally conductive insulating pad 300 is provided between the second connecting portion 2042 and the end plate 202. The thermally conductive insulating pad 300 can be compressed by the pre-tightening force installed on the second connecting portion 2042, thereby reducing the air gap, reducing the contact thermal resistance, establishing a heat transfer path between the connecting pad 204 and the end plate 202, and improving the heat exchange efficiency between the second connecting portion 2042 and the end plate 202.

[0060] Meanwhile, in some exemplary embodiments, the output electrode bus 203 is covered with a thermally conductive insulating layer 2031. Specifically, the thermally conductive insulating layer 2031 can be an insulating skin with insulating, waterproof, and thermally conductive properties, such as thermally conductive silicone skin, to ensure the heat exchange efficiency between the output electrode bus 203 and the first cooling channel 2021 while ensuring that the output electrode bus 203 is not affected by the coolant. If necessary, a sealing ring 400 is also provided between the output electrode bus 203 and the end plate 202 to prevent coolant from leaking out of the first cooling channel 2021.

[0061] It should be mentioned that the end plate 202 in this embodiment is preferably made of plastic. This embodiment Figure 3 The main feature is the endplate flow channel structure. Figure 4 This is a wireframe diagram of the endplate flow channel. The endplate flow channel is actually composed of cavities opened inside the endplate 202. The reason for the simplification is... Figure 3 It is considered Figure 4 There are many lines in the middle, making it difficult to understand, but the actual structure of the endplate flow channel should be as follows: Figure 4 As shown. And, still as... Figure 1 and 3As shown, an inlet pipe 101 and an outlet pipe 102 are provided between the end plate 202 and the cold plate 100. The end plate flow channel also includes an inlet flow channel 2026 connecting the flow channel of the cold plate 100 with the second cooling flow channel 2022 and the third cooling flow channel 2023, an outlet flow channel 2027 connecting the flow channel of the cold plate 100 with the first cooling flow channel 2021, and a connecting flow channel 2025 connecting the first cooling flow channel 2021, the second cooling flow channel 2022 and the third cooling flow channel 2023. At least a portion of the inlet flow channel 2026 is located in the inlet pipe 101, and at least a portion of the outlet flow channel 2027 is located in the outlet pipe 102.

[0062] It is worth noting that, regarding the battery pack of this embodiment, based on the above exemplary embodiments, in specific implementation, as a preferred embodiment, it is still composed of... Figures 1 to 3 As shown, it includes a cold plate 100 and a cell module 200 disposed on the cold plate 100.

[0063] The battery module 200 includes end cells 201 and end plates 202 arranged sequentially along the length of the battery module 200, an output electrode conductive bus 203 disposed on the end plate 202, and a connecting bus 204 connecting the terminal posts of the end cells 201 and the output electrode conductive bus 203. Meanwhile, the end plate 202 is provided with an end plate flow channel that communicates with the flow channel of the cold plate 100, and at least a portion of the end plate flow channel corresponds to the output electrode conductive bus 203, and a connection area Q between the output electrode conductive bus 203 and the connecting bus 204 is provided.

[0064] The connecting bus 204 includes a first connecting portion 2041 connecting the terminal post of the end cell 201 and a second connecting portion 2042 connecting the output electrode conductive bus 203, and the projections of the second connecting portion 2042 and the output electrode conductive bus 203 in the length direction of the cell module 200 at least partially overlap.

[0065] The end plate flow channel includes a first cooling flow channel 2021 corresponding to the output electrode busbar 203, a second cooling flow channel 2022 corresponding to the terminal post of the end cell 201, and a third cooling flow channel 2023 corresponding to the second connection portion 2042; furthermore, the second cooling flow channel 2022 and the third cooling flow channel 2023 are arranged in parallel, and along the length direction of the cell module 200, the second cooling flow channel 2022 is located between the end cell 201 and the third cooling flow channel 2023.

[0066] Along the length of the cell module 200, the first cooling channel 2021 is spaced apart from the end cell 201; meanwhile, along the width of the cell module 200, at least a portion of the first connecting portion 2041 is provided corresponding to the second cooling channel 2022 and the third cooling channel 2023.

[0067] Among them, along the width direction of the battery cell module 200, the output pole current-carrying bar 203 penetrates through the end plate 202, and the part of the output pole current-carrying bar 203 located in the end plate 202 is immersed in the first cooling channel 2021; moreover, along the width direction of the battery cell module 200, the projected contour of the first cooling channel 2021 is in the shape of a Chinese character 'hui' (a square with a hole in the middle).

[0068] Among them, an inwardly concave mounting groove 2024 is provided on the end plate 202. Along the length direction of the battery cell module 200, the mounting groove 2024 is located on the side of the end plate 202 away from the battery cells of the end plate 202; meanwhile, the second connecting part 2042 is located in the mounting groove 2024, and both the second cooling channel 2022 and the third cooling channel 2023 are arranged corresponding to the mounting groove 2024.

[0069] Among them, both the second cooling channel 2022 and the third cooling channel 2023 are arranged along the height direction of the battery cell module 200, and along the width direction of the battery cell module 200, the second cooling channel 2022 and the third cooling channel 2023 include a plurality of shunt channels that are sequentially spaced and connected in parallel.

[0070] Among them, along the width direction of the battery cell module 200, the width H1 of the second cooling channel 2022 satisfies: 30 mm ≤ H1 ≤ 40 mm; meanwhile, along the width direction of the battery cell module 200, the width H2 of the third cooling channel 2023 satisfies: 30 mm ≤ H2 ≤ 40 mm.

[0071] Among them, a thermally conductive insulating pad 300 is provided between the second connecting part 2042 and the end plate 202; moreover, a thermally conductive insulating layer 2031 is coated on the output pole current-carrying bar 203.

[0072] In the preferred embodiment of the above battery pack, the specific settings and layout manners of the cold plate 100, battery cell module 200, end battery cells 201, end plate 202, first cooling channel 2021, second cooling channel 2022, third cooling channel 2023, mounting groove 2024, connecting bar 204, thermally conductive insulating pad 300, sealing ring 400, BDU 500, etc. can still be seen in the descriptions in the above various exemplary embodiments. And in this preferred embodiment, the beneficial effects brought by the design of the cold plate 100, battery cell module 200, end battery cells 201, end plate 202, first cooling channel 2021, second cooling channel 2022, third cooling channel 2023, mounting groove 2024, connecting bar 204, thermally conductive insulating pad 300, sealing ring 400, BDU 500, etc. can also be seen in the descriptions in the above various exemplary embodiments.

[0073] The battery pack of this embodiment adopts the above design. By setting at least part of the end plate flow channel corresponding to the output electrode conductive bus 203 and the connection area Q between the output electrode conductive bus 203 and the connection bus 204, heat dissipation can be achieved for the output electrode conductive bus 203 and the connection area Q between the output electrode conductive bus 203 and the connection bus 204. In this way, by reducing the output electrode conductive bus 203 and the connection bus 204, the temperature of the terminal post of the end cell 201 is reduced, thereby solving the problem that the fast charging rate is limited by the temperature of the end cell 201. This can meet the requirement of improving the fast charging rate of the battery pack.

[0074] An embodiment of the second aspect of this application provides an electrical device that includes the battery pack described above.

[0075] The power device of this embodiment, by setting the battery pack in the first aspect embodiment, can reduce the temperature at the terminal post of the end cell 201, so that the temperature between the cells in the battery pack tends to be more uniform, thereby solving the problem that the fast charging rate is limited by the temperature of the end cell 201, which can help improve the fast charging rate of the battery pack and make the power device have a better performance.

[0076] The above descriptions are merely some embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1. A battery pack, characterized in that: it includes a cold plate and a battery cell module disposed on the cold plate: the battery cell module includes an end battery cell and an end plate arranged in sequence along the length direction of the battery cell module, an output pole busbar disposed on the end plate, and a connection busbar connecting the pole post of the end battery cell and the output pole busbar: the end plate is provided with an end plate flow channel communicating with the flow channel of the cold plate, and at least part of the end plate flow channel corresponds to the output pole busbar and the connection area Q between the output pole busbar and the connection busbar.

2. The battery pack according to claim 1, characterized in that: the connection busbar includes a first connection part connecting the pole post of the end battery cell and a second connection part connecting the output pole busbar, and at least part of the projections of the second connection part and the output pole busbar in the length direction of the battery cell module overlap.

3. The battery pack according to claim 2, characterized in that: the end plate flow channel includes a first cooling flow channel corresponding to the output pole busbar, a second cooling flow channel corresponding to the pole post of the end battery cell, and a third cooling flow channel corresponding to the second connection part; the second cooling flow channel and the third cooling flow channel are arranged in parallel, and along the length direction of the battery cell module, the second cooling flow channel is located between the end battery cell and the third cooling flow channel.

4. The battery pack according to claim 3, characterized in that: along the length direction of the battery cell module, the first cooling flow channel is spaced from the end battery cell; and / or, along the width direction of the battery cell module, at least part of the first connection part corresponds to the second cooling flow channel and the third cooling flow channel.

5. The battery pack according to claim 3, characterized in that: along the width direction of the battery cell module, the output pole busbar penetrates through the end plate, and the part of the output pole busbar located in the end plate is immersed in the first cooling flow channel; and / or, along the width direction of the battery cell module, the projected contour of the first cooling flow channel is in the shape of a "hui" character.

6. The battery pack according to claim 3, characterized in that: the end plate is provided with an inwardly concave mounting groove, and along the length direction of the battery cell module, the mounting groove is located on the side of the end plate away from the end battery cell; the second connection part is located in the mounting groove, and both the second cooling flow channel and the third cooling flow channel correspond to the mounting groove.

7. The battery pack according to claim 3, characterized in that: both the second cooling flow channel and the third cooling flow channel are arranged along the height direction of the battery cell module, and along the width direction of the battery cell module, the second cooling flow channel and / or the third cooling flow channel include a plurality of shunt channels arranged at intervals and in parallel.

8. The battery pack according to claim 7, characterized in that: along the width direction of the battery cell module, the width H1 of the second cooling flow channel satisfies: 30mm ≤ H1 ≤ 40mm; and / or, along the width direction of the battery cell module, the width H2 of the third cooling flow channel satisfies: 30mm ≤ H2 ≤ 40mm.

9. The battery pack according to any one of claims 2 to 8, characterized in that: A thermally conductive insulating pad is provided between the second connecting portion and the end plate; and / or, The output electrode busbar is covered with a thermally conductive insulating layer.

10. An electrical device, characterized in that: The electrical device is provided with a battery pack as described in any one of claims 1 to 9.

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