Battery cell module and battery pack

Abstract

The utility model provides a battery cell module and a battery pack. The battery cell module comprises a plurality of battery cell units, the battery cell units and the heat insulation units are arranged in an array mode in the length direction and the width direction of the battery cell module, the battery cell units are arranged in the circumferential direction of the heat insulation units in a surrounding mode, and the heat insulation units are located in the middle of the battery cell module. By applying the technical scheme of the utility model, the technical problem of poor temperature uniformity of the battery can be improved.

Description

Technical Field

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

[0002] In related technologies, battery energy storage generates heat during the charging and discharging process. This heat is the main factor that causes battery energy storage system insecurity. Studies have shown that temperature has a significant impact on battery performance, including capacity, power, and safety. In battery energy storage systems, the large number of batteries clustered together results in greater capacity and power. To improve battery energy storage efficiency, batteries are typically arranged in multiple rows, with a large number of batteries tightly packed within a certain space. Operating conditions are complex and variable, resulting in large temperature differences between batteries. Over time, this can lead to a decline in the charge and discharge performance, capacity, and lifespan of some batteries, affecting the performance of the entire battery energy storage system. In severe cases, thermal runaway can occur, resulting in major accidents. Utility Model Content

[0003] The embodiments of the present utility model provide a battery cell module and a battery pack, which can improve the technical problem of poor battery temperature uniformity.

[0004] In the first aspect, an embodiment of the present invention provides a battery cell module, which includes: a plurality of battery cell units; and at least one thermal insulation unit. The plurality of battery cell units and the thermal insulation unit are arranged in an array along the length and width directions of the battery cell module. The battery cell units are arranged around the thermal insulation unit, and the thermal insulation unit is located in the middle of the battery cell module.

[0005] In one embodiment, the battery cell module also includes a containing box, which is arranged above the battery cell unit and the insulation unit. The containing box has a guide channel that is arranged along the height direction of the battery cell module. The guide channel is arranged in a one-to-one correspondence with the explosion-proof valve of the battery cell unit. The guide channel is used to guide the electrolyte in the battery cell unit.

[0006] In one embodiment, a cross-sectional shape of the flow guide channel along the length direction of the battery cell module is the same as a cross-sectional shape of the explosion-proof valve along the length direction of the battery cell module.

[0007] In one embodiment, the cross-sectional area of ​​the flow guide channel along the length direction of the battery cell module is S1, the cross-sectional area of ​​the explosion-proof valve along the length direction of the battery cell module is S2, and S1≥S2.

[0008] In one embodiment, the accommodating box includes: a cover plate; a box body, the cover plate is arranged on the box body, the side of the box body away from the cover plate is connected to the battery cell unit and the insulation unit, and the box body is used to accommodate the bus; a guide column, which is arranged in the box body along the height direction of the battery cell module, and the guide column has a guide channel.

[0009] In an embodiment, the box comprises: a bottom plate connected with the cell units and the heat insulation units on a side away from the cover plate; a plurality of side plates arranged at the periphery of the bottom plate along the circumference of the bottom plate; wherein the bottom plate has a plurality of accommodating portions for accommodating the bus bars, the accommodating portions are arranged one-to-one with the cell units, each accommodating portion has an opening corresponding to the pole of the cell unit, and the bus bar is connected with the pole of the corresponding cell unit through the opening.

[0010] In an embodiment, the cell module has a plurality of cell groups arranged along the length direction of the cell module, each cell group comprises: a plurality of cell units arranged along the width direction of the cell module, or a plurality of cell units and heat insulation units arranged along the width direction of the cell module; wherein a heat insulation member is arranged between two adjacent cell groups.

[0011] In an embodiment, the plurality of cell groups form a cell part, and the cell module further comprises: two end plates arranged at two ends of the cell part along the length direction of the cell module; a fixing member arranged around the cell part and the two end plates, the fixing member being used for fixing the cell part and the two end plates; and a heat conduction member arranged between the end plate and the cell part.

[0012] In an embodiment, the cell module further comprises a collection assembly, the collection assembly comprises a collection wire harness and a collection terminal, the collection wire harness is at least partially arranged in the box, the collection terminal is located on the outside of the box, one end of the collection wire harness is connected with the bus bar, and the other end of the collection wire harness is connected with the collection terminal.

[0013] In an embodiment, the heat insulation unit has the same length, width and height as the cell unit.

[0014] In a second aspect, an embodiment of the utility model provides a battery pack, the battery pack comprises the cell module.

[0015] The technical scheme of the utility model is applied to arrange at least one heat insulation unit and a plurality of cell units in an array, so that the heat insulation unit does not occupy additional installation space, and the heat insulation unit is arranged in the middle part of the cell module, and the cell units are arranged around the heat insulation unit in the circumference, so that the temperature difference between the plurality of cell units can be reduced as much as possible during the operation of the cell module, the uniformity of the temperature of the plurality of cell units is improved, the charge and discharge performance, capacity and service life of the battery are improved, and the performance of the whole battery energy storage system is improved, and the occurrence of thermal runaway and other accidents can be avoided as much as possible. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0017] Figure 1 is a perspective view of the battery cell module provided by the embodiment of the present application;

[0018] Figure 2 is an exploded view of the battery cell module provided by the embodiment of the present application;

[0019] Figure 3 is a perspective view of the box provided by the embodiment of the present application;

[0020] Figure 4 is a partial structure view of the battery cell module provided by the embodiment of the present application;

[0021] Figure 5 is a top view of the partial structure of the battery cell module provided by the embodiment of the present application.

[0022] Among them, the above drawings include the following reference signs:

[0023] 10, battery cell unit;

[0024] 20, heat insulation unit;

[0025] 30, containing box; 31, flow guide channel; 32, cover plate; 33, box body; 331, bottom plate; 332, side plate; 34, flow guide column; 35, opening;

[0026] 40, busbar;

[0027] 50, explosion-proof valve;

[0028] 60, pole;

[0029] 70, heat insulation piece;

[0030] 80, end plate;

[0031] 90, fixing piece;

[0032] 100, heat conduction piece;

[0033] 110, acquisition assembly; 111, acquisition wire harness; 112, acquisition terminal;

[0034] X, length direction of the battery cell module; Y, width direction of the battery cell module; Z, height direction of the battery cell module. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0036] like Figures 1 to 5 As shown, in the first aspect, an embodiment of the present invention provides a battery cell module, which includes: a plurality of battery cell units 10; and at least one thermal insulation unit 20. The plurality of battery cell units 10 and the thermal insulation unit 20 are arranged in an array along the length and width directions of the battery cell module. The battery cell units 10 are arranged around the thermal insulation unit 20, and the thermal insulation unit 20 is located in the middle of the battery cell module.

[0037] By applying the technical solution of the present invention, at least one thermal insulation unit 20 and a plurality of battery cell units 10 are arranged in an array, so that the thermal insulation unit 20 does not occupy additional installation space. At the same time, the thermal insulation unit 20 is arranged in the middle of the battery cell module, and battery cell units 10 are arranged around the thermal insulation unit 20. In this way, during the operation of the battery cell module, the temperature difference between the multiple battery cell units 10 can be reduced as much as possible to improve the temperature uniformity of the multiple battery cell units 10. This can improve the charging and discharging performance, capacity and life of the battery, thereby improving the performance of the entire battery energy storage system, and can also avoid accidents such as thermal runaway as much as possible.

[0038] In one embodiment, the battery cell module further includes a storage box 30, which is positioned above the battery cell units 10 and the thermal insulation unit 20. The storage box 30 includes a flow channel 31 extending along the height of the battery cell module. The flow channel 31 corresponds to the explosion-proof valve 50 of the battery cell unit 10 and is used to guide the electrolyte within the battery cell unit 10. This arrangement allows the electrolyte within the battery cell unit 10 to flow out of the storage box 30 when excessive pressure within the battery cell unit 10 ruptures the explosion-proof valve 50. Because the storage box 30 is positioned above the battery cell unit 10 and the thermal insulation unit 20, it prevents electrolyte flowing out of the battery cell unit 10 from contacting the terminal 60 of the battery cell unit 10, which could cause a short circuit in the battery cell 10. This improves the stability of the battery cell module during operation.

[0039] In one embodiment, the cross-sectional shape of the flow channel 31 along the length of the cell module is the same as the cross-sectional shape of the explosion-proof valve 50 along the length of the cell module. This arrangement facilitates the outflow of the electrolyte from the flow channel 31 while minimizing the possibility of the electrolyte not entering the flow channel 31.

[0040] In an embodiment, the cross-sectional area of the flow guide channel 31 along the length direction of the battery cell module is S1, and the cross-sectional area of the explosion-proof valve 50 along the length direction of the battery cell module is S2, S1≥S2. By setting the above structure, the flow guiding effect of the flow guide channel 31 can be improved as much as possible, so as to effectively reduce the risk of short circuit when the battery cell module is out of control.

[0041] In an embodiment, the containing box 30 comprises: a cover plate 32; a box body 33, the cover plate 32 is covered on the box body 33, the side of the box body 33 away from the cover plate 32 is connected with the battery cell unit 10 and the heat insulation unit 20, and the box body 33 is used for containing the busbar 40; and a flow guide column 34, which is provided in the box body 33 along the height direction of the battery cell module and has the flow guide channel 31. In this way, the flow guide column 34 does not need to occupy additional installation space, thereby facilitating the reduction of the overall volume of the containing box 30 and the miniaturization development of the battery cell module.

[0042] In an embodiment, the box body 33 comprises: a bottom plate 331, the side of the bottom plate 331 away from the cover plate 32 is connected with the battery cell unit 10 and the heat insulation unit 20; a plurality of side plates 332, which are circumferentially arranged at the periphery of the bottom plate 331; wherein the bottom plate 331 has a plurality of containing portions for containing the busbar 40, the containing portions are arranged one by one corresponding to the battery cell unit 10, each containing portion has an opening 35 corresponding to the pole column 60 of the battery cell unit 10, and the busbar 40 is connected with the pole column 60 of the corresponding battery cell unit 10 through the opening 35. In this application, the bottom plate 331 and the side plate 332 are an integrated molding structure, the integrated molding process integrates multiple processes into one operation, greatly shortens the production cycle, and improves the production efficiency. At the same time, the automatic integrated molding technology adopts automatic equipment and process control system to realize the whole process automation from raw material processing to finished product output, further improving the production efficiency. Furthermore, the integrated molding process adopts advanced mold design and manufacturing technology to ensure that the material can accurately fill every detail of the mold during the molding process, thereby improving the dimensional accuracy and shape accuracy of the product.

[0043] Further, the integrated molding avoids the secondary processing and gluing process in the traditional process, reduces the defects and flaws on the surface of the product, and improves the overall quality of the product. In addition, proper heat treatment during the integrated molding process also helps to improve the hardness and strength of the material, thereby improving the service life and reliability of the product.

[0044] In an embodiment, the battery cell module has a plurality of battery cell groups arranged along the length direction of the battery cell module, each battery cell group comprising a plurality of battery cell units 10 arranged along the width direction of the battery cell module, or a plurality of battery cell units 10 and a heat insulation unit 20 arranged along the width direction of the battery cell module; and a heat insulation member 70 arranged between two adjacent battery cell groups. In this way, the battery cell module can be divided and controlled by the heat insulation member 70, limiting the range of heat spread when the battery cell unit 10 is in thermal runaway, thereby improving the safety of the battery cell module.

[0045] In the present application, the heat insulation member 70 comprises foam or aerogel. The foam can be silica gel foam, MPP foam, XPP foam or the like. Silica gel foam is a foam sponge-like silicone material formed by foaming polysiloxane, which has excellent properties such as high flame retardance, aging resistance, super water resistance, super dust resistance, lightweight, insulation, high and low temperature resistance, etc. Its service life is 3-5 times that of traditional foam materials, and it is also significantly better than traditional foam materials in terms of comfort, foam density and environmental protection. Silica gel foam is widely used in new energy vehicle lithium battery box 33 sealing and box bottom damping, new energy vehicle liquid cooling system damping material, high-speed rail floating floor support and damping, aerospace lightweight sealing material, and sealing of 5G signal towers and other instruments and meters. In addition, in the field of construction, silica gel foam is widely used due to its excellent sound insulation, shock resistance and waterproof performance.

[0046] In an embodiment, the plurality of battery cell groups form a battery cell part, and the battery cell module further comprises two end plates 80 arranged at two ends of the battery cell part along the length direction of the battery cell module, a fixing member 90 arranged around the battery cell part and the two end plates 80, the fixing member 90 being used to fix the battery cell part and the two end plates 80, and a heat conduction member 100 arranged between the end plate 80 and the battery cell part. In this way, not only the insulation effect of the battery cell unit 10 can be improved, but also the heat dissipation effect of the battery cell can be improved. In the present application, the heat conduction member 100 is specifically a silica gel pad.

[0047] In an embodiment, the battery cell module further comprises a collection assembly 110, the collection assembly 110 comprising a collection wire harness 111 and a collection terminal 112, the collection wire harness 111 being at least partially arranged in the box 33, the collection terminal 112 being located on the outside of the box 33, one end of the collection wire harness 111 being connected to the busbar 40, and the other end of the collection wire harness 111 being connected to the collection terminal 112. The collection assembly 110 is used to collect data such as temperature and voltage of the battery cell unit 10, so as to monitor the battery cell unit 10, thereby further improving the safety of the battery cell module during operation.

[0048] In an embodiment, the thermal insulation unit 20 has the same length, width and height as the cell unit 10. In this way, the number of thermal insulation units 20 can be reduced, which not only facilitates the overall installation and disassembly of the cell module, but also reduces the production cost of the thermal insulation unit 20, so as to facilitate the mass production of the cell module.

[0049] In a second aspect, the embodiments of the utility model provide a battery pack, the battery pack includes the cell module.

[0050] The technical scheme of the utility model is applied, at least one thermal insulation unit 20 is arranged in an array with a plurality of cell units 10, so that the thermal insulation unit 20 does not occupy additional installation space, and the thermal insulation unit 20 is arranged in the middle of the cell module, and the cell units 10 are arranged around the thermal insulation unit 20 in the circumferential direction, so that the temperature difference between the plurality of cell units 10 can be reduced as much as possible during the operation of the cell module, to improve the uniformity of the temperature of the plurality of cell units 10, so that the charge-discharge performance, capacity and life of the battery can be improved, thereby improving the performance of the entire battery energy storage system, and accidents such as thermal runaway can be avoided as much as possible.

[0051] It should be noted that the terms used herein are only intended to describe specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a reference to the presence of a feature, step, operation, device, component and / or combinations thereof.

[0052] Unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions, and numerical values set forth in the various embodiments described herein are not limiting. Also, it is to be understood that the drawings are not necessarily to scale. For the most part, the dimensions can have been arbitrarily scaled or exaggerated for the sake of clarity. Technical, methods, and apparatus known to those of ordinary skill have not been described in detail in order to avoid obscuring the present application. In the interest of clarity, not all of the included components of the systems, methodologies, and apparatus are shown and described. It will be appreciated that in the development of any such actual implementation, numerous implementation-specific decisions can be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints. These specific goals will vary from one implementation to another and from one developer to another. Moreover, it is understood that a variety of programming language actinic media and combinations thereof can be employed to

[0053] In the description of the utility model, it is understood that the orientation words such as '' front, back, up, down, left, right '' '' horizontal, vertical, perpendicular, horizontal '' and '' top, bottom '' and the like indicated orientation or positional relationship is usually based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, in the absence of the opposite statement, these orientation words do not indicate and imply that the device or element indicated must have a particular orientation or be constructed and operated in a particular orientation, therefore can not be understood as the limitation of the protection scope of the utility model;The orientation words '' inside, outside '' refer to the inside and outside relative to the contour of each component.

[0054] For the convenience of description, spatial relative terms such as '' above'', '' above'', '' upper surface'', '' upper '' and the like can be used here to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawing. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawing. For example, if the device in the drawing is inverted, the device described as '' above '' or '' above '' other devices or structures will be positioned '' below '' or '' below '' other devices or structures. Thus, the exemplary term '' above '' can include both '' above '' and '' below '' orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative description used here is interpreted accordingly.

[0055] In addition, it should be noted that the use of '' first'', '' second '' and the like to limit parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, therefore can not be understood as the limitation of the protection scope of the utility model.

[0056] The above only describes the preferred embodiments of the utility model, and is not used to limit the utility model, for those skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A battery cell module, characterized in that: The battery cell module includes: Multiple battery cells; At least one thermal insulation unit, a plurality of the battery cell units and the thermal insulation unit are arranged in an array along the length and width directions of the battery cell module, the battery cell units are arranged around the thermal insulation unit, and the thermal insulation unit is located in the middle of the battery cell module.

2. The battery cell module according to claim 1, characterized in that: The battery cell module also includes a containing box, which is arranged above the battery cell unit and the insulation unit. The containing box has a guide channel that penetrates along the height direction of the battery cell module. The guide channel is arranged in a one-to-one correspondence with the explosion-proof valve of the battery cell unit. The guide channel is used to guide the electrolyte in the battery cell unit.

3. The battery cell module according to claim 2, characterized in that: The cross-sectional shape of the flow guide channel along the length direction of the battery cell module is the same as the cross-sectional shape of the explosion-proof valve along the length direction of the battery cell module.

4. The battery cell module according to claim 2, characterized in that: The cross-sectional area of ​​the flow guide channel along the length direction of the battery cell module is S1, and the cross-sectional area of ​​the explosion-proof valve along the length direction of the battery cell module is S2, where S1≥S2.

5. The battery cell module according to any one of claims 2 to 4, characterized in that: The receiving box comprises: cover; A box body, the cover plate is arranged on the box body, a side of the box body away from the cover plate is connected to the battery cell unit and the thermal insulation unit, and the box body is used to accommodate a busbar; A guide column is provided in the box body along the height direction of the battery core module, and the guide column has the guide channel.

6. The battery cell module according to claim 5, characterized in that: The box includes: a bottom plate, wherein a side of the bottom plate away from the cover plate is connected to the battery cell unit and the thermal insulation unit; A plurality of side plates, wherein the plurality of side plates are arranged around the periphery of the bottom plate along the circumference of the bottom plate; In which, the base plate has multiple accommodating parts, which are used to accommodate the busbars. The accommodating parts are arranged in a one-to-one correspondence with the battery cell units. Each of the accommodating parts has an opening, and the opening is arranged corresponding to the pole of the battery cell unit. The busbar is connected to the pole of the corresponding battery cell unit through the opening.

7. The battery cell module according to claim 1, characterized in that: The battery cell module has a plurality of battery cell groups arranged along the length direction of the battery cell module, and each of the battery cell groups includes: A plurality of the battery cell units arranged along the width direction of the battery cell module, or A plurality of the battery cell units and the thermal insulation unit arranged along the width direction of the battery cell module; Wherein, a heat insulating member is provided between two adjacent battery cell groups.

8. The battery cell module according to claim 7, characterized in that: A plurality of the battery cell groups form a battery cell portion, and the battery cell module further comprises: Two end plates are respectively arranged at both ends of the battery core along the length direction of the battery core module; A fixing member, wound around the battery core and the two end plates, the fixing member being used to fix the battery core and the two end plates; The heat conducting member is arranged between the end plate and the battery core.

9. The battery cell module according to claim 5, characterized in that: The battery cell module also includes a collection component, which includes a collection harness and a collection terminal. The collection harness is at least partially arranged in the box, and the collection terminal is located outside the box. One end of the collection harness is connected to the bus, and the other end of the collection harness is connected to the collection terminal.

10. The battery cell module according to claim 5, characterized in that: The heat insulation unit and the battery core unit have the same length, width and height.

11. A battery pack, characterized in that: The battery pack includes the battery cell module according to any one of claims 1 to 10.

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