Battery pack and power device

Abstract

The utility model discloses a battery pack and a power plant, the battery pack comprises: a housing, in which an accommodating cavity is formed; the battery pack comprises a plurality of battery modules, each battery module comprises a plurality of battery monomers, the plurality of battery monomers are arranged in the thickness direction, and the opposite side surfaces of every two adjacent battery monomers are mutually attached; the positive current collector is arranged at one end of the battery monomer in the length direction, the negative current collector is arranged at the other end of the battery monomer in the length direction, and the negative current collector is connected with a negative electrode of the battery monomer. According to the battery pack disclosed by the utility model, the battery monomers are connected in parallel to form the battery module, so that the thermal runaway heat-insulation protection cost is reduced, and in addition, the plurality of battery monomers are connected in parallel, and the small-capacity battery core is manufactured into the large-capacity battery core, so that the reject ratio of directly manufacturing the battery module is reduced, and the safety and the capacity of the battery module are improved.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, and in particular to a battery pack and a power unit. Background Technology

[0002] The relevant technology indicates that lithium iron phosphate (LFP) cells currently account for the largest proportion of electrochemical energy storage, and large capacity and high safety are the key technological directions that LFP battery development is focusing on. Increasing the capacity of individual cells and reducing the number of cells collected is currently the best technical path to reduce the cost of energy storage systems. However, when the capacity of individual cells is increased, it will lead to a decrease in cell safety, large overcurrent at the cell terminals and electrical connections, more heat generation, and difficulty in heat dissipation. Moreover, low yield is a current R&D challenge for large-capacity cells. Based on the above factors, the capacity of current energy storage LFP cells is usually above 280Ah, with some exceeding 1000Ah. Furthermore, in order to ensure that thermal runaway in a single cell does not spread to adjacent cells, aerogel pads are required between cells for thermal barrier.

[0003] The existing technology has the following problems: 1. As the cell capacity increases, the defect rate rises, resulting in high manufacturing costs and a loss of cell safety; 2. The existing cell capacity is relatively small, and the number of sampling channels is large, resulting in high sampling costs; 3. In order to prevent thermal runaway between cells from spreading, aerogel needs to be installed between each cell, which results in high thermal insulation costs; 4. Existing energy storage cells are basically large-capacity square cells. Due to the small capacity and high sampling costs of pouch cells, pouch cells cannot be used for energy storage. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the present invention provides a battery pack that has low production cost and high safety.

[0005] This utility model also proposes a power device having the above-mentioned battery pack.

[0006] A battery pack according to a first aspect of the present invention includes: a housing having a receiving cavity formed therein; a battery module comprising a plurality of battery modules, each battery module comprising a plurality of battery cells arranged in a thickness direction; a positive current collector and a negative current collector, the positive current collector being disposed at one end of the battery cell in a length direction and connected to the positive electrode of the battery cell, and the negative current collector being disposed at the other end of the battery cell in a length direction and connected to the negative electrode of the battery cell.

[0007] According to the battery pack of this utility model, by connecting individual battery cells in parallel to form a battery module, the cost of thermal runaway insulation and protection is reduced. Furthermore, by connecting multiple individual battery cells in parallel, small-capacity cells are made into large-capacity cells, which reduces the defect rate of directly manufacturing battery modules and improves the safety and capacity of battery modules. Positive current collectors and negative current collectors are respectively set at both ends, which reduces sampling costs.

[0008] In some embodiments, a plurality of conductive portions are formed on both the positive current collector and the negative current collector, and each conductive portion includes a conductive platform and a conductive post, wherein the conductive platform is connected between the current collector and the conductive post.

[0009] In some embodiments, the housing includes a positive terminal plate and a negative terminal plate, both of which have through holes. The through holes correspond one-to-one with the conductive platform, and the conductive platform is located in the through hole.

[0010] In some embodiments, an insulating bushing is provided between the conductive platform and the through hole, the end face of the conductive platform is located outside the through hole, and the distance between the end face of the conductive platform and the end face of the insulating bushing is not less than 0.5 mm.

[0011] In some embodiments, the receiving cavity is filled with an immersion liquid, and both the positive current collector and the negative current collector are located in the immersion liquid, with at least a portion of the battery cell located in the immersion liquid.

[0012] In some embodiments, an explosion-proof valve is provided on the positive terminal plate, and an exhaust connector is formed on the negative terminal plate. The interior of each battery cell can communicate with both the explosion-proof valve and the exhaust connector.

[0013] In some embodiments, the housing includes side plates disposed on both sides of the battery cell in the thickness direction, a heat insulation plate is provided between the side plates and the battery cell, and a rib extending in the length direction of the battery cell is formed on the side plates. The rib and the heat insulation plate define an exhaust channel, and the two ends of the exhaust channel are respectively connected to the explosion-proof valve and the exhaust connector. A one-way valve is provided in the exhaust connector.

[0014] In some embodiments, the housing includes a top plate and a bottom plate, wherein the bottom plate is bonded to the battery cell via structural adhesive.

[0015] In some embodiments, the battery pack further includes a management module electrically connected to each of the battery cells and located in the immersion liquid, and a communication interface formed on the housing, the communication interface being electrically connected to the management module.

[0016] The power device according to the second aspect of the present invention includes the battery pack according to the first aspect of the present invention.

[0017] According to the power device of this utility model, by setting the battery pack of the first aspect mentioned above, the overall performance of the power device is improved, the safety of the power device is enhanced, and the production cost of the power device is reduced.

[0018] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a battery pack according to an embodiment of the present utility model;

[0020] Figure 2 yes Figure 1 A schematic diagram of the battery pack from another perspective;

[0021] Figure 3 yes Figure 1 An exploded view of the battery pack shown;

[0022] Figure 4 yes Figure 2 An exploded view of the battery pack shown from another perspective;

[0023] Figure 5 yes Figure 1 The diagram shows the end plate assembly of the battery pack.

[0024] Figure 6 yes Figure 5 The diagram shows the assembly of individual battery cells in the battery pack.

[0025] Figure 7 yes Figure 5 A schematic diagram of the battery pack from another perspective;

[0026] Figure 8 yes Figure 6 This is another schematic diagram of the battery pack shown.

[0027] Figure label:

[0028] 100. Battery module;

[0029] 1. Shell; 11. Positive end plate; 111. Explosion-proof valve; 12. Negative end plate; 121. Exhaust connector; 13. Insulating bushing; 14. Heat insulation board; 15. Side plate; 151. Rib; 16. Top plate; 17. Bottom plate;

[0030] 2. Battery cell; 21. Safety valve;

[0031] 3. Positive current collector; 4. Negative current collector;

[0032] 5. Conductive part; 51. Conductive platform; 52. Conductive post. Detailed Implementation

[0033] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0034] Reference below Figures 1-8 A battery pack according to a first aspect embodiment of the present invention is described.

[0035] like Figures 1-8 As shown, the battery pack according to the first aspect of the present invention includes: a housing 1, a battery module 100, a positive current collector 3, and a negative current collector 4.

[0036] Specifically, a receiving cavity is formed within the casing 1, and a battery module 100 is formed. The battery module 100 includes multiple battery cells 2, each of which is arranged in the thickness direction. A positive current collector 3 is located at one end of the battery cell 2 in the length direction and is connected to the positive electrode of the battery cell 2. A negative current collector 4 is located at the other end of the battery cell 2 in the length direction and is connected to the negative electrode of the battery cell 2. It can be understood that multiple battery cells 2 are used to form the battery module 100, using small-capacity cells to create large-capacity cells. This solves the problem of defects easily occurring when directly manufacturing large-capacity cells. When a cell experiences thermal runaway, the impact of thermal runaway can be controlled within the corresponding module, preventing it from spilling over and affecting other modules. Compared to the conventional large-capacity battery module 100 design, where the entire pack is scrapped due to thermal runaway of one cell, this design reduces the damage and impact of thermal runaway failures.

[0037] According to the battery pack of this utility model embodiment, by connecting the battery cells 2 in parallel to form a battery module 100, the cost of thermal runaway insulation protection is reduced. Furthermore, by connecting multiple battery cells 2 in parallel, small-capacity cells are made into large-capacity cells, which reduces the defect rate of directly manufacturing the battery module 100 and improves the safety and capacity of the battery module 100. Positive current collector 3 and negative current collector 4 are respectively set at both ends, which reduces sampling costs.

[0038] In some embodiments of the present invention, Figures 1-4As shown, multiple conductive portions 5 are formed on both the positive electrode current collector 3 and the negative electrode current collector 4. Each conductive portion 5 includes a conductive platform 51 and a conductive post 52, with the conductive platform 51 connecting the current collector and the conductive post 52. This arrangement of the conductive platform 51 and conductive post 52 increases the effective contact area, reduces resistance loss, and improves the energy transfer efficiency of the entire battery pack. Furthermore, the conductive post 52 and conductive platform 51 serve a positioning function, reducing the assembly difficulty of the battery pack and improving its assembly efficiency.

[0039] In some embodiments of the present invention, Figures 1-4 As shown, the housing 1 includes a positive terminal plate 11 and a negative terminal plate 12. Both the positive terminal plate 11 and the negative terminal plate 12 have through holes, which are correspondingly arranged with conductive platforms 51 located within the through holes. This improves the compactness of the assembly between the end plate and the current collector, reduces assembly difficulty, and simplifies the connection between the battery cell 2 and external electrical components.

[0040] In some embodiments of the present invention, Figures 1-4 As shown, an insulating bushing 13 is provided between the conductive platform 51 and the through hole. The end face of the conductive platform 51 is located outside the through hole, and the distance between the end face of the conductive platform 51 and the end face of the insulating bushing 13 is not less than 0.5mm. In this way, the insulating bushing 13 ensures electrical isolation between the conductive platform 51 and the end plate, guarantees good insulation performance, and improves the safety and reliability of the battery pack. The end face of the conductive platform 51 extends at least 0.5mm beyond the end face of the insulating bushing 13, ensuring a rigid and locked connection with the external copper busbar and preventing loosening.

[0041] In some embodiments of this invention, the receiving cavity is filled with an immersion liquid, and both the positive electrode current collector 3 and the negative electrode current collector 4 are located in the immersion liquid, with at least a portion of the battery cell 2 also located in the immersion liquid. It is understood that the immersion liquid cools and de-cools both the positive electrode current collector 3 and the negative electrode current collector 4, while also reducing the temperature difference between the battery cells 2. It is particularly important to note that the safety valve 21 of the battery cell 2 must not be located in the immersion liquid.

[0042] In some embodiments of the present invention, Figures 1-4As shown, an explosion-proof valve 111 is provided on the positive terminal plate 11, and an exhaust connector 121 is formed on the negative terminal plate 12. The interior of each battery cell 2 can communicate with both the explosion-proof valve 111 and the exhaust connector 121. The housing 1 includes side plates 15 located on both sides of the battery cell 2 in the thickness direction. A heat insulation plate 14 is provided between the side plates 15 and the battery cell 2. A rib 151 extending in the length direction of the battery cell 2 is formed on the side plates 15. The rib 151 and the heat insulation plate 14 define an exhaust channel. The two ends of the exhaust channel are respectively connected to the explosion-proof valve 111 and the exhaust connector 121. A one-way valve is provided in the exhaust connector 121. Thus, the heat insulation plate 14 reduces heat transfer, which helps to maintain the stable operation of the battery cell 2 within a suitable range. The two ends of the exhaust channel are respectively connected to the explosion-proof valve 111 and the exhaust connector 121, which ensures that the high-temperature gas in the battery pack is released quickly, preventing battery damage or explosion.

[0043] Alternatively, the insulation board 14 can be an epoxy board or a mica board.

[0044] It should be noted that when it is a blade battery cell 2, the safety valve 21 is set at both ends of the battery cell 2; when it is a pouch battery cell 2, the high temperature and high pressure gas generated by thermal runaway cracks from the aluminum-plastic film pressing joint, which acts as the safety valve 21. Therefore, the pouch battery does not need to be equipped with a safety valve 21.

[0045] In some embodiments of this utility model, the housing 1 includes a top plate 16 and a bottom plate 17, with the bottom plate 17 bonded to the battery cells 2 via structural adhesive. That is, the structural adhesive between the bottom plate 17 and the battery cells 2 has thermal conductivity, ensuring the safety and reliability of the battery pack.

[0046] In some embodiments of this utility model, the battery pack further includes a management module, which is electrically connected to each battery cell 2 and is located in the immersion liquid. A communication interface is formed on the housing 1, and the communication interface is electrically connected to the management module. Therefore, the voltage, current, temperature, and other parameters of each battery cell 2 can be monitored in real time, providing the battery pack with safety functions such as overcharge protection, over-discharge protection, and short-circuit protection, thereby improving the battery pack's thermal management capabilities and safety.

[0047] The power device according to a second aspect embodiment of the present invention includes a battery pack according to the first aspect embodiment of the present invention described above.

[0048] According to the power device of the present invention, by providing the battery pack of the first aspect embodiment described above, the overall performance of the power device is improved, the safety of the power device is enhanced, and the production cost of the power device is reduced.

[0049] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0051] In this utility model, unless otherwise expressly specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0052] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0053] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that, include: A housing having a receiving cavity formed within it; A battery module, comprising multiple battery modules, each battery module comprising multiple battery cells, the multiple battery cells being arranged in the thickness direction; A positive current collector and a negative current collector are provided. The positive current collector is located at one end of the battery cell along its length and is connected to the positive electrode of the battery cell. The negative current collector is located at the other end of the battery cell along its length and is connected to the negative electrode of the battery cell.

2. The battery pack according to claim 1, characterized in that, Multiple conductive portions are formed on both the positive current collector and the negative current collector. Each conductive portion includes a conductive platform and a conductive post, with the conductive platform connecting the current collector and the conductive post.

3. The battery pack according to claim 2, characterized in that, The housing includes a positive terminal plate and a negative terminal plate, and through holes are formed on both the positive terminal plate and the negative terminal plate. The through holes are arranged in a one-to-one correspondence with the conductive platform, and the conductive platform is located in the through hole.

4. The battery pack according to claim 3, characterized in that, An insulating bushing is provided between the conductive platform and the through hole. The end face of the conductive platform is located outside the through hole, and the distance between the end face of the conductive platform and the end face of the insulating bushing is not less than 0.5 mm.

5. The battery pack according to claim 4, characterized in that, The cavity is filled with an immersion liquid, and both the positive current collector and the negative current collector are located in the immersion liquid. At least a portion of the battery cell is located in the immersion liquid.

6. The battery pack according to claim 5, characterized in that, An explosion-proof valve is provided on the positive terminal plate, and an exhaust connector is formed on the negative terminal plate. The interior of each battery cell can be connected to both the explosion-proof valve and the exhaust connector.

7. The battery pack according to claim 6, characterized in that, The housing includes side plates on both sides of the battery cell in the thickness direction. A heat insulation plate is provided between the side plates and the battery cell. A rib extending in the length direction of the battery cell is formed on the side plates. The rib and the heat insulation plate define an exhaust channel. The two ends of the exhaust channel are respectively connected to the explosion-proof valve and the exhaust connector. A one-way valve is provided in the exhaust connector.

8. The battery pack according to claim 7, characterized in that, The housing includes a top plate and a bottom plate, wherein the bottom plate is bonded to the battery cell via structural adhesive.

9. The battery pack according to claim 8, characterized in that, Also includes: The management module is electrically connected to each of the battery cells and is located in the immersion liquid. A communication interface is formed on the housing and is electrically connected to the management module.

10. A battery pack, characterized in that, The battery pack includes any one of claims 1-9.

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