Battery module and battery pack

Abstract

The utility model provides a battery module and battery pack wherein the battery module comprises: a plurality of electrical core assemblies, each electrical core assembly comprises: N electrical cores, N is a positive integer and N > 2; the N battery cells are sequentially arranged along the length direction of the overflowing plate; each battery cell comprises a tab, and open slots are sequentially formed in the overflowing plate in the length direction of the overflowing plate and used for allowing the tabs to penetrate in; the fixing frame corresponds to the battery cells, a limiting piece is arranged on one side of the fixing frame, a limiting hole corresponding to the limiting piece is formed in the other side of the fixing frame, and the fixing frame for fixing the battery cells penetrates into the limiting hole through the limiting piece so as to limit the adjacent battery cells; and the integrated busbar is arranged on the battery cell assembly, the integrated busbar comprises a connecting plate, and the connecting plate is pressed on the over-current plate. According to the utility model, the total capacity and the total voltage of the module can be improved at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of power vehicles, in particular to a battery module and a battery pack. Background Art

[0002] With the introduction of relevant national laws and regulations on new energy, the development of new energy vehicles is a key measure to alleviate energy and environmental pressures and promote the sustainable development of the automotive industry. New energy vehicles include pure electric vehicles and hybrid vehicles. However, regardless of the type of vehicle, batteries are required to provide power. Due to the inherent characteristics of power batteries, they require series and parallel connections to increase the capacity and voltage of the battery pack during use.

[0003] In the prior art, soft-pack batteries are connected in parallel by welding the tabs to the busbar. In this parallel connection method, the two tabs are bent onto the busbar on either side and welded together. Therefore, a busbar can only support two tabs in parallel. The resulting capacity of the module is limited and cannot meet actual needs. At the same time, an injection molded frame is used to support the stacking of soft-pack batteries. However, due to the low strength of the injection molded frame, it is easy to collapse and be damaged in the subsequent process flow, resulting in a small number of soft-pack batteries connected in series. At this time, the voltage obtained by the module cannot meet the high voltage requirements.

[0004] Therefore, in order to obtain a module with higher capacity and voltage at the same time, it is necessary to provide a battery module and a battery pack to solve the above-mentioned problems existing in the prior art. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a battery module and a battery pack to solve the problem of low capacity and voltage of the battery module in the prior art.

[0006] In order to solve the above technical problems, the present invention provides a battery module, comprising:

[0007] A plurality of battery cell assemblies, each of the battery cell assemblies comprising:

[0008] N battery cells, where N is a positive integer and N>2;

[0009] A current plate, wherein the N battery cells are arranged in sequence along the length direction of the current plate; each battery cell includes a tab, and the current plate is provided with opening slots in sequence along the length direction thereof for the tabs to penetrate;

[0010] A fixing frame corresponding to the battery cell, wherein a limiting member is provided on one side of the fixing frame and a limiting hole corresponding to the limiting member is provided on the other side. The fixing frame fixing the battery cell is inserted into the limiting hole through the limiting member to limit the adjacent battery cell;

[0011] An integrated busbar is arranged on the battery cell assembly, and the integrated busbar includes a connecting plate, which is pressed onto the current plate.

[0012] The battery module provided by the utility model has the following beneficial effects:

[0013] By providing an open slot for the tab to pass through along the length of the current plate, the current plate can simultaneously connect N battery cells in parallel. However, due to the small cross-sectional area of ​​the current plate, the current flow capacity is weak. Therefore, the current plate is pressed onto the connecting plate of the integrated busbar, which effectively increases the cross-sectional area, thereby enhancing the current flow capacity and thus increasing the capacity of the battery module. At the same time, a fixed frame is used to fix each battery cell, and a limiter and a limit hole corresponding to the limiter are designed on the fixed frame. By inserting the limiter into the limit hole, the adjacent fixed frames and battery cells are locked in position, thereby locking N battery cells together in turn to form a battery cell assembly, and multiple battery cell assemblies can be integrated into a longer module. In this way, multiple battery cells can be connected in series, thereby increasing the voltage of the battery module. The battery module provided by the utility model can simultaneously increase the capacity and voltage of the battery module, which has a profound impact on the field of power vehicle technology.

[0014] Preferably, the overflow plate is provided with M open slots in sequence along its length, where M is a positive integer and M=N-2; the tabs of the first battery cell and the tabs of the Nth battery cell are inserted from both ends of the overflow plate, and the tabs of the battery cell located between the first and Nth battery cells are inserted into the corresponding open slots. The beneficial effect is that the overflow plate is provided with M open slots, and M=N-2, i.e., the number of open slots is designed to be the number of battery cells minus two. Compared with the prior art, this greatly increases the number of parallel battery cells, and the overflow plate can be used to connect N battery cells in parallel according to specific practical requirements.

[0015] Preferably, the connecting plate is provided with a groove corresponding to the tab, so that when the tab is inserted into the groove, the connecting plate and the current plate are closely connected. This has the beneficial effect of: the connecting plate is provided with a groove corresponding to the tab, so that when the connecting plate and the current plate are affixed together, the tab is inserted into the groove, ensuring that the connecting plate is affixed to the current plate.

[0016] Preferably, a fixing plate is further included, and the plurality of battery cell assemblies are mounted and fixed on the fixing plate. This has the beneficial effect of placing the plurality of battery cell assemblies connected in series and parallel on the fixing plate. During subsequent processes such as hoisting, the fixing plate can provide support for the plurality of battery cell assemblies. Compared with no support, this ensures that the plurality of battery cell assemblies will not collapse or be damaged during subsequent processes.

[0017] Preferably, the battery assembly further includes end plates, two of which are respectively abutted against the two ends of the battery cell assembly and connected to the fixing plate. This advantageously provides the following advantages: an end plate is placed on each end side of the battery cell assembly, and the battery cell assembly is squeezed from both ends using the end plates. After squeezing is completed, the end plates and the battery cell assembly are locked to the fixing plate, thereby maintaining the state of the integrated battery cell assembly.

[0018] Preferably, the battery cell assembly is mounted on the fixing plate by sequentially inserting a fastener through the first through-hole of the end plate and the second through-hole of the fixing plate. This advantageously allows the fastener to engage the first through-hole of the end plate and the second through-hole of the fixing plate, securely locking the battery cell assembly and the end plate to the fixing plate, thereby integrating the battery cell assembly.

[0019] Preferably, a steel belt is further included, and the steel belt is arranged around the periphery of the battery core assembly. The beneficial effect is that the extruded battery core assembly is bound by arranging the steel belt around the periphery of the battery core assembly.

[0020] Preferably, the integrated busbar further comprises a blister plate, on which a cavity for accommodating the connecting plate is formed. The beneficial effect is that the blister plate is used to support and fix the connecting plate, and the cavity formed on the blister plate facilitates the connection between the connecting plate and the flow plate.

[0021] Preferably, the fixed plate is a liquid cooling plate, comprising a plate body, a liquid inlet, and a liquid outlet, the liquid inlet and the liquid outlet being connected via a liquid channel provided on the plate body. The beneficial effect of using a liquid cooling plate as the fixed plate is that it not only provides fixed support for the entire battery cell assembly but also provides heat dissipation for the battery module, ensuring that the battery module operates within a suitable temperature range.

[0022] The present invention also provides a battery pack, comprising: a plurality of battery modules as described above.

[0023] For the beneficial effects of the battery pack provided by the present invention, please refer to the description of the battery module above. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Shown is a schematic structural diagram of a battery module according to an embodiment of the present utility model;

[0025] Figure 2 Shown is a schematic diagram of the assembled state of the battery module according to an embodiment of the present invention;

[0026] Figure 3 Shown is a schematic diagram of a battery cell assembly and a connecting plate according to an embodiment of the present invention;

[0027] Figure 4 Shown is a schematic structural diagram of a portion of a battery cell assembly according to an embodiment of the present utility model;

[0028] Figure 5 Shown is a schematic structural diagram of a flow plate according to an embodiment of the present utility model;

[0029] Figure 6 Shown is a schematic structural diagram of a connecting plate according to an embodiment of the present utility model;

[0030] Figure 7-Figure 8 Shown is a structural schematic diagram of a fixing frame according to an embodiment of the present utility model;

[0031] Figure 9 Shown is a schematic diagram of the integration of the fixing frames of an embodiment of the present utility model;

[0032] Figure 10 Shown is an exploded view of an integrated busbar according to an embodiment of the present invention;

[0033] Figure 11 Shown is a structural schematic diagram of a fixing plate according to an embodiment of the present utility model.

[0034] Component number description

[0035] 1. Battery cell assembly; 11. Battery cell; 111. Tab; 12. Current overflow plate; 121. Opening slot; 13. Fixing frame; 131. First limiting piece; 132. First limiting hole; 133. Second limiting piece; 134. Second limiting hole; 2. Integrated busbar; 21. Connecting plate; 211. Groove; 22. Blister plate; 23. Collection harness assembly; 3. Fixing plate; 31. Second through hole; 32. Plate body; 33. Liquid inlet; 34. Liquid outlet; 4. End plate; 5. Fastener; 6. Steel belt. DETAILED DESCRIPTION

[0036] The following describes the implementation of the present invention through specific embodiments. People familiar with this technology can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0037] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model. Therefore, they have no technical substantive significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed by the utility model without affecting the efficacy and purpose that can be achieved by the utility model. The following detailed description should not be considered restrictive, and the scope of the embodiments of this application is limited only by the claims of the published patents. The terms used here are only for describing specific embodiments and are not intended to limit this application. Spatial-related terms, such as "upper", "lower", "left", "right", "below", "below", "lower", "above", "upper", etc., may be used in the text to facilitate the description of the relationship between one element or feature shown in the figure and another element or feature.

[0038] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," "holding," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0039] Furthermore, as used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It should be further understood that the terms "comprise", "include" indicate the presence of the described features, operations, elements, components, items, kinds, and / or groups, but do not exclude the presence, occurrence, or addition of one or more other features, operations, elements, components, items, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Thus, "A, B, or C" or "A, B, and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B, and C". Exceptions to this definition occur only when the combination of elements, functions, or operations is inherently mutually exclusive in some way.

[0040] like Figures 1-11As shown, an embodiment of the present invention provides a battery module, comprising: a plurality of battery cell assemblies 1 and an integrated busbar 2, to realize the integration of the plurality of battery cell assemblies 1. The integrated busbar 2 is arranged on the battery cell assembly 1. Each battery cell assembly 1 includes N battery cells 11, an overcurrent plate 12 and a fixing frame 13, wherein N is a positive integer and N>2. As the smallest energy storage unit, the battery cell 11 directly affects the performance of the entire module. The overcurrent plate 12 connects the battery cells 11 in parallel, and the current transmitted by the battery cell 11 is transmitted to the outside world through the overcurrent plate 12. The fixing frame 13 is used to install and fix the battery cell 11, and the number of the fixing frame 13 corresponds to the number of the battery cells 11.

[0041] N battery cells 11 are arranged in sequence along the length direction of the current plate 12. Each battery cell 11 includes a tab 111. The current plate 12 is provided with opening slots 121 in sequence along its length direction for the tabs 111 to pass through. A limiting member is provided on one side of the fixing frame 13, and a limiting hole corresponding to the limiting member is provided on the other side. The fixing frame 13 that fixes the battery cells 11 is passed through the limiting hole by the limiting member to limit the adjacent battery cells 11. The integrated busbar 2 includes a connecting plate 21, which is pressed onto the current plate 12.

[0042] By providing an open groove 121 along the length direction of the current plate 12 for the tab 111 to penetrate, it is possible to connect multiple battery cells 11 in parallel at the same time. However, due to the small cross-sectional area of ​​the current plate 12, the current flow capacity is small. Therefore, the connecting plate 21 is pressed onto the current plate 12, which effectively increases the cross-sectional area, thereby greatly increasing the current flow capacity, thereby improving the overall capacity of the battery module; at the same time, a limiting member and a limiting hole corresponding to the limiting member are designed on the fixing frame 13 for installing and fixing the battery cell 11. By inserting the limiting member into the corresponding limiting hole, the adjacent battery cells 11 and the fixing frame 13 are limited and supported, so that each battery cell 11 and the fixing frame 13 are connected more closely together, thereby enabling a larger number of battery cells 11 to be connected in series, thereby improving the voltage of the entire battery module. Therefore, by designing the opening slot 121 of the current plate 12 and the limiting member and limiting hole of the fixing frame 13, a larger number of battery cells 11 can be connected in parallel at the same time, and the parallel-connected battery cells 11 can be connected in series, thereby achieving the effect of simultaneously increasing the capacity and voltage of the battery module. It should be noted that the specific size design of the current plate 12 needs to be specifically designed according to the actual number of parallel-connected battery cells 11 and the size of the tab 111, and is not specifically limited here.

[0043] It should be understood that the tabs 111 are conductive connectors extending from the battery cells 11 and are used to connect to external circuits during charging and discharging. It should also be understood that the integrated busbar (CCS, Cells Contact System), a key component in the battery module, enables high-voltage series and parallel connection of the battery cells 11 and enables temperature and voltage sampling of the battery.

[0044] Exemplarily, the material of the flow plate 12 and the connecting plate 21 is copper, aluminum or other materials, which are not specifically limited here.

[0045] like Figure 3-Figure 5 As shown, in some embodiments of the present invention, the current plate 12 is provided with M open slots 121 along its length, where M is a positive integer and M=N-2. The tabs 111 of the first battery cell 11 and the tabs 111 of the Nth battery cell 11 are disposed at opposite ends of the current plate 12, and the tabs 111 of the battery cell 11 between the first and Nth battery cells 11 are inserted into the corresponding open slots 121. For example, if a battery cell assembly 1 has seven battery cells 11, then the number of corresponding positive and negative tabs is also seven. Each positive tab corresponds to one current plate 12, and each negative tab also corresponds to one current plate 12. Thus, one current plate 12 connects the seven positive tabs together, and one current plate 12 connects the seven negative tabs together, thereby enabling the seven battery cells 11 to be connected in parallel. The following description uses the positive tabs as an example, and the same applies to the negative tabs. The number of opening slots 121 corresponding to the seven battery cells 11 is five, that is, the positive tabs of the five middle battery cells 11 pass through the opening slots 121 and are bent to contact the flow plate 12, and the positive tabs of the first battery cell 11 and the positive tabs of the seventh battery cell 11 pass through the two end sides of the flow plate 12 and are bent to contact the flow plate 12, that is, one flow plate simultaneously connects seven tabs in parallel. Compared with the prior art, by providing opening slots 121 on the flow plate 12, the number of battery cells 11 connected in parallel can be greatly increased. It should be noted that the specific number of opening slots 121 needs to be specifically designed according to the number of battery cells 11 that need to be connected in parallel, and is not specifically limited here.

[0046] In other embodiments of the present invention, the flow plate 12 is provided with openings 121 sequentially along its length, corresponding to the tabs 111. Specifically, the number of openings 121 is the same as the number of tabs 111, so that the tabs 111 pass through the openings 121 and are bent until they contact the flow plate 12. In this embodiment, the tabs 111 are not bent at either end of the flow plate 12; the number of openings 121 can be specifically designed based on actual usage.

[0047] like Figure 3 and Figure 6As shown, in some embodiments of the present invention, a groove 211 corresponding to the pole lug 111 is provided on the connecting plate 21. The groove 211 is provided on the connecting plate 21 so that when the pole lug 111 is inserted into the groove 211, the connecting plate 21 is fitted and connected to the flow plate 12. It should be noted that the number and size of the connecting plates 21 need to be specifically designed according to actual usage. It should also be noted that the specific number of grooves 211 is the same as the number of corresponding pole lugs 111, so that when the connecting plate 21 and the flow plate 12 are fitted and connected together, the groove 211 can place the pole lug 111 bent on the flow plate 12 in the groove 211, thereby fixing the connecting plate 21 and the flow plate 12 together, for example, by welding.

[0048] Place the overflow plate 12 on the battery cells 11 to be connected in parallel, so that the pole ears 111 of each battery cell 11 pass through the two end sides of the overflow plate 12 and the open groove 121, and then bend the pole ears 111 until they contact the overflow plate 12, and weld them by methods such as laser welding. The bent pole ears 111 are welded to the overflow plate 12; place the connecting plate 21 on the battery cell assembly 1, at this time, the connecting plate 21 covers the bent pole ears 111, and the groove 211 of the connecting plate 21 allows the pole ears 111 to be placed therein, so that the connecting plate 21 and the overflow plate 12 are fitted together, and at this time, the connecting plate 21 is welded to the overflow plate 12 by methods such as laser welding. In this way, the current plate 12 connects the cells 11 in parallel. However, due to the small cross-sectional area of ​​the current plate 12 with the open slots 121, the current flow capacity is weakened. By welding the current plate 12 and the connecting plate 21 together, the current is transferred to the connecting plate 21, effectively increasing the cross-sectional area and thus improving the current flow capacity. This solution greatly increases the number of cells 11 connected in parallel, thereby increasing the capacity of the battery module. It should be noted that the thickness of the groove 211 should be designed to be sufficient to accommodate the thickness of the tab 111.

[0049] like Figure 7-Figure 9 As shown, in some embodiments of the present invention, the limiting member includes a first limiting member 131 and a second limiting member 133. The limiting hole includes a first limiting hole 132 and a second limiting hole 134. The first limiting member 131 and the first limiting hole 132 are arranged on one side of the frame body of the fixed frame 13, and the second limiting member 133 and the second limiting hole 134 are arranged on the other side of the frame body of the fixed frame 13. It should be noted that one side of the frame body is relative to the other side. For example, Figure 7 The face of the frame shown is defined as a side, then Figure 8The surface shown is defined as the other side. The first limiting member 131 is inserted into the second limiting hole 134 and the second limiting member 133 is inserted into the first limiting hole 132, thereby limiting and supporting the adjacent fixing frames 13 together, that is, integrating the adjacent battery cells 11 more tightly together. For example, the first limiting member 131 of the first fixing frame 13 is inserted into the second limiting hole 134 of the second fixing frame 13, and the second limiting member 133 of the second fixing frame 13 is inserted into the first limiting hole 132 of the first fixing frame 13; the first limiting member 131 of the second fixing frame 13 is inserted into the second limiting hole 134 of the third fixing frame 13, and the second limiting member 133 of the third fixing frame 13 is inserted into the first limiting hole 132 of the second fixing frame 13... and so on, which will not be repeated here. It should be noted that there is no specific limitation on the number of limiting members and limiting holes, and the specific design can be made according to actual needs.

[0050] For example, the fixing frame 13 is rectangular in shape, and the shape of the fixing frame 13 is specifically designed according to the shape of the battery cell 11. The first limiting member 131 and the first limiting hole 132 are respectively arranged at the diagonal corners of one side of the rectangular frame, and the second limiting member 133 and the second limiting hole 134 are respectively arranged at the diagonal corners of the other side of the rectangular frame, so that the first limiting member 131 and the second limiting hole 134 correspond to each other, and the second limiting member 133 and the first limiting hole 132 correspond to each other, so that adjacent rectangular frames can be tightly stacked together by inserting the first limiting member 131 into the second limiting hole 134 and the second limiting member 133 into the first limiting hole 132, which can tightly connect the parallel-connected battery cells 11 together and achieve the effect of connecting multiple battery cells 11 in series at the same time.

[0051] like Figure 1 and Figure 2 As shown, in some embodiments of the present invention, the battery module further includes a fixing plate 3. Multiple battery cell assemblies 1 are mounted and fixed on the fixing plate 3. By first fixing the battery cell assemblies 1 to the fixing plate 3, strong support is provided to the multiple battery cell assemblies 1 during subsequent operations, thereby preventing the battery cell assemblies 1 from collapsing due to lack of support at the bottom. In this way, even if the integration of multiple battery cell assemblies 1 causes the battery module to be longer, it will not cause collapse.

[0052] like Figure 1-Figure 3As shown, in some embodiments of the present invention, the battery module further includes an end plate 4. The two end plates 4 are respectively abutted against the two ends of the battery cell assembly 1 and are connected to the fixed plate 3. After the N battery cells 11 are connected in parallel into a battery cell assembly 1 through the overflow plate 12, the multiple battery cell assemblies 1 are connected in series; the two end plates 4 are respectively abutted against the two end sides of the battery cell assembly 1 connected in series, and an extrusion force is applied to the two ends of the battery cell assembly 1 connected in series, thereby integrating the battery cell assembly 1 together, and locking the two end plates 4 and the battery cell assembly 1 on the fixed plate 3, thereby maintaining the state after the end plate 4 squeezes the battery cell assembly 1, and at the same time, the fixed plate 3 provides support for the integrated battery cell assembly 1, and will not cause the battery cell assembly 1 to collapse or be damaged during the process of hoisting into the box.

[0053] like Figure 1 and Figure 2 As shown and combined with reference Figure 11 In some embodiments of the present invention, the battery cell assembly 1 is mounted on the fixing plate 3 by sequentially inserting the fastener 5 into the first through-hole of the end plate 4 and the second through-hole 31 of the fixing plate 3. When the battery cell assembly 1 is squeezed and stacked on the fixing plate 3 using the end plate 4, the fastener 5 is sequentially inserted into the first through-hole of the end plate 4 and the second through-hole 31 of the fixing plate 3 to lock the stacked battery cell assembly 1 on the fixing plate 3 and maintain the stacked state of the battery cell assembly 1. Exemplarily, the fastener 5 is a long, strip-shaped bolt.

[0054] like Figure 1 and Figure 2 As shown, in some embodiments of the present invention, the battery module further includes a steel belt 6. The steel belt 6 is arranged around the periphery of the battery cell assembly 1. After the battery cell assembly 1 is extruded and stacked on the fixing plate 3 using the end plate 4, the steel belt 6 is used to bind the periphery of the battery cell assembly 1 to fix the extruded battery cell assembly 1. In order to better bind the multiple battery cell assemblies 1, two steel belts 6 are respectively arranged around the upper and lower positions of the battery cell assembly 1 to better assemble the multiple battery cell assemblies 1 connected in series and maintain the stacked state of the battery cell assemblies 1.

[0055] The individual battery cells 11 are arranged according to the positive and negative poles, first in parallel and then in series, that is, the arranged battery cells 11 are placed on the fixed plate 3, and the battery cells 11 and the fixed plate 3 are placed on the extrusion table to stack and extrude the modules. After the extrusion is completed, they are fixed with steel strips 6, and the end plates 4 are locked with long bolts to lock the module assembly on the fixed plate 3. The integrated busbar 2 is then placed on the module assembly, and the current plate 12 and the connecting plate 21 are welded. In this process, the battery cells 11 are stacked directly on the fixed plate 3, and the module assembly is directly fixed on the fixed plate 3. In subsequent processes such as hoisting and loading into the box, due to the support of the fixed plate 3, no matter how long the module is, it will not collapse or arch. Therefore, the length of the module is effectively increased, the number of series connections is increased, and the voltage of the module is increased.

[0056] like Figure 3 and Figure 10 As shown, in some embodiments of the present invention, the integrated busbar 2 further includes a blister plate 22, which has a cavity for accommodating the connecting plate 21. The connecting plates 21 are placed in the cavities of the blister plate 22 so that when the integrated busbar 2 is placed on the battery cell assembly 1, the connecting plates 21 and the current plate 12 can be welded together.

[0057] In some embodiments of the present invention, the integrated busbar 2 further includes a data acquisition harness assembly 23. This harness assembly 23 is mounted on a blister plate 22. The blister plate 22 supports and secures the connecting plate 21 and the data acquisition harness assembly 23. The data acquisition harness assembly 23 is used to collect information such as the temperature and voltage of the battery modules and transmit this information to the battery management system for processing.

[0058] like Figure 1 and Figure 11 As shown, in some embodiments of the present invention, the fixed plate 3 is a liquid cooling plate. The liquid cooling plate includes a plate body 32, a liquid inlet 33 and a liquid outlet 34, and the liquid inlet 33 and the liquid outlet 34 are connected through a liquid flow channel provided on the plate body 32. The coolant enters the liquid flow channel of the plate body 32 from the liquid inlet 33 for cooling and flows out from the liquid outlet 34. That is, the liquid cooling plate not only serves as a supporting device for multiple battery cell assemblies 1, but also serves as a heat dissipation device for the battery module. The liquid cooling plate transfers the heat generated by the battery during operation by contacting its surface, and then the heat is taken away by the coolant in the internal liquid flow channel, thereby maintaining the battery operating within a suitable temperature range and ensuring the performance and life of the battery.

[0059] like Figure 1-Figure 3 As shown and combined with reference Figure 9For example, nine battery cell assemblies 1 form a first module, and nine battery cell assemblies 1 form a second module. The tabs 111 of the battery cells 11 extend through the openings 121 of the current plate 12 and are bent onto the current plate 12 at both ends. The tabs 111 are welded to the current plate 12, for example, thereby increasing the number of battery cells 11 connected in parallel. The first module and the second module are arranged side by side on the fixed plate 3. Specifically, the limiting members of the fixed frame 13 are inserted into the limiting holes corresponding to the limiting members, thereby tightly connecting each battery cell 11 and the fixed frame 13, and each battery cell assembly 1 can also be tightly connected, thereby increasing the number of battery cells 11 connected in series; two end plates 4 are respectively abutted against the two ends of the first module, and two end plates 4 are respectively abutted against the two ends of the second module for compression and fixation, and steel strips 6 are used to bind along the outer periphery of the first module, and steel strips 6 are used to bind along the outer periphery of the second module, and fasteners 5 are respectively inserted into the first through holes of the end plates 4 and the second through holes of the fixed plate 3 to lock the first module and the second module to the fixed plate 3. At the same time, the integrated busbar 2 is arranged on the first module and the second module, and the connecting plate 21 of the integrated busbar 2 is fixed to the current plate 12 of the battery cell assembly 1 by, for example, welding, which effectively increases the cross-sectional area and improves the current capacity.

[0060] An embodiment of the present invention also provides a battery pack, comprising: a battery module as described above. The battery pack is composed of a plurality of battery modules. In addition, the battery pack also includes a thermal management system, a battery management system, a shell and an upper cover, etc. The thermal management system is used to control and adjust the battery temperature to ensure that the battery operates within an appropriate temperature range and prevent overheating from affecting the battery performance and life. The battery management system is used to monitor the battery status, temperature, voltage and other parameters, and to realize charge and discharge control, fault diagnosis and other functions. The battery module is arranged in the shell and the upper cover, and the shell and the upper cover are used to protect and fix the battery module.

[0061] In summary, due to the small number of parallel stacked battery cells, the capacity of the battery module is relatively low. Therefore, in order to obtain a battery module with a higher capacity, more battery cells need to be connected in parallel. However, the overcurrent will become larger at this time, and the cross-sectional area of ​​the metal plate used for overcurrent needs to be increased. Therefore, in order to be able to connect a larger number of battery cells in parallel and meet the overcurrent capacity, the utility model has an open slot on the overcurrent plate that allows the tabs to pass through, thereby achieving the parallel connection of a larger number of battery cells. However, due to the opening of the slot, the cross-sectional area of ​​the overcurrent plate becomes smaller, and the overcurrent is small. Therefore, by welding the overcurrent plate and the connecting plate together, the cross-sectional area is effectively increased, the overcurrent capacity is improved, and the problem of low module capacity due to the limited number of parallel battery cells in the prior art is solved. At the same time, after the cells are connected in parallel, in order to obtain a higher voltage, more cell components need to be connected in series, and the length of the module will become longer. However, since the existing technology requires an external injection molding frame to support the stacked cells, when the stacked modules are subsequently hoisted into the box, the low strength of the injection molding frame makes it difficult to support the longer modules, which can easily cause the modules to collapse and be damaged. Therefore, in order to be able to connect more cells in series to obtain a higher voltage, the present invention designs a limiter and a limit hole corresponding to the limiter on the fixed frame for installing and fixing the cells. The limiter of the fixed frame is inserted into the limit hole of the adjacent fixed frame, providing strong support for the integration of each cell, and can stack more cells, connect more cells in series, and tightly connect the stacked cells together, thereby solving the problem of low module voltage due to the limited number of cells connected in series in the existing technology. When subsequently hoisted into the box, the tightly connected fixed frames will not collapse and be damaged. Through the technical solution of the present invention, the capacity and voltage of the module are effectively increased at the same time, which has a profound impact on the electric vehicle and energy storage markets. Therefore, the utility model effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0062] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed in the present invention are intended to be covered by the claims of the present invention.

Claims

1. A battery module, characterized in that: include: A plurality of battery cell assemblies (1), each of the battery cell assemblies (1) comprising: N battery cells (11), wherein N is a positive integer and N>2; A flow plate (12), wherein N battery cells (11) are sequentially arranged along the length direction of the flow plate (12); each battery cell (11) comprises a tab (111); and the flow plate (12) is sequentially provided with opening slots (121) along its length direction for the tabs (111) to penetrate therethrough; A fixing frame (13) corresponding to the battery cell (11), wherein a limiting member is provided on one side of the fixing frame (13), and a limiting hole corresponding to the limiting member is provided on the other side, and the fixing frame (13) fixing the battery cell (11) passes through the limiting member and enters the limiting hole to limit the adjacent battery cell (11); An integrated busbar (2) is arranged on the battery core assembly (1), and the integrated busbar (2) includes a connecting plate (21), and the connecting plate (21) is pressed onto the current plate (12).

2. The battery module according to claim 1, wherein: The current overflow plate (12) is sequentially provided with M opening slots (121) along its length direction, wherein M is a positive integer and M=N-2; the pole lug (111) of the first battery cell (11) and the pole lug (111) of the Nth battery cell (11) penetrate from both ends of the current overflow plate (12), and the pole lug (111) of the battery cell (11) located between the first battery cell (11) and the Nth battery cell (11) penetrates the corresponding opening slot (121).

3. The battery module according to claim 1, wherein: The connecting plate (21) is provided with a groove (211) corresponding to the pole lug (111), so that when the pole lug (111) passes through the groove (211), the connecting plate (21) is fitted and connected to the current plate (12).

4. The battery module according to claim 1, wherein: It also includes a fixing plate (3), and a plurality of the battery core assemblies (1) are mounted and fixed on the fixing plate (3).

5. The battery module according to claim 4, characterized in that: It also includes end plates (4), wherein the two end plates (4) are respectively in contact with the two ends of the battery core assembly (1) and are connected to the fixing plate (3).

6. The battery module according to claim 5, characterized in that: The battery core assembly (1) is mounted on the fixing plate (3) by sequentially penetrating the first through hole of the end plate (4) and the second through hole (31) on the fixing plate (3) through a fastener (5).

7. The battery module according to claim 1, characterized in that: It also includes a steel belt (6), which is arranged around the outer periphery of the battery core assembly (1).

8. The battery module according to claim 1, wherein: The integrated busbar (2) further comprises a blister plate (22), and a cavity for accommodating the connecting plate (21) is provided on the blister plate (22).

9. The battery module according to claim 4, characterized in that: The fixed plate (3) is a liquid cooling plate, comprising a plate body (32), a liquid inlet (33) and a liquid outlet (34), wherein the liquid inlet (33) and the liquid outlet (34) are connected via a liquid flow channel provided on the plate body (32).

10. A battery pack, characterized in that: include: A plurality of battery modules according to any one of claims 1 to 9.

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