CN218004942U - Battery cell structure and battery module - Google Patents

Abstract

The utility model provides an electricity core structure and battery module. Wherein, electric core structure has electric core big face and electric core top cap, and electric core structure includes: the winding structure comprises a plurality of winding cores, a winding core and a winding core, wherein the two ends of each winding core in a first direction are respectively provided with a positive electrode lug and a negative electrode lug, and the plurality of winding cores are sequentially and adjacently arranged along a second direction perpendicular to the first direction; and the L-shaped adapter plate is provided with a first edge extending along the first direction and a second edge extending along the second direction, wherein the first edge is connected with the cell top cover, and the second edge is connected with the positive pole lugs or the negative pole lugs of the plurality of winding cores and then is attached to the large surface of the cell to form a bulge part on the large surface of the cell, so that a groove is formed in the area outside the bulge part on the large surface of the cell. The utility model discloses a roll up core in the electric core structure and lay side by side and can realize in the dilatation of length direction, electric core appearance possesses long, thin characteristic, increases heat radiating area by a wide margin.

Description

Battery cell structure and battery module

Technical Field

The utility model mainly relates to the field of batteries, especially, relate to an electricity core structure and battery module.

Background

With the rapid development of automobile electromotion and new energy storage, the market has higher and higher requirements on energy density, cycle life and battery cost of power batteries and energy storage batteries. Current research mainly focuses on assembling into more electric cores in limited module space, furthest reduces the auxiliary component among the module equipment process, strengthens module inside radiating effect etc. to realize higher energy density, longer cycle life and lower cost input.

Patent CN202010022452.5 proposes a battery. The battery mainly utilizes the inside series connection of a plurality of reel core groups, promotes electric core voltage in order to realize electric core overall energy and promote. However, the winding core of each independent cavity is stacked in the thickness direction to increase the capacity in parallel, and the whole heat dissipation effect of the battery cell is poor. Meanwhile, the internal series structure needs to isolate the electrolyte of each independent chamber, and some complicated structural connecting pieces can be introduced, so that the manufacturing cost and difficulty are increased.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide an electricity core structure and battery module, solve electric core and pile up the dilatation in the thickness direction and lead to the poor problem of radiating effect.

In order to solve the technical problem, the utility model provides an electricity core structure has electric core big face and electric core top cap, electricity core structure includes: the winding core comprises a plurality of winding cores, a plurality of winding cores and a plurality of control modules, wherein both ends of each winding core in a first direction are respectively provided with a positive electrode lug and a negative electrode lug, and the plurality of winding cores are sequentially and adjacently arranged along a second direction vertical to the first direction; and the L-shaped adapter sheet is provided with a first edge extending along the first direction and a second edge extending along the second direction, wherein the first edge is connected with the cell top cover, and the second edge is connected with the positive pole lugs or the negative pole lugs of the plurality of winding cores and then attached to the large surface of the cell to form a convex part on the large surface of the cell, so that a groove is formed in the area outside the convex part on the large surface of the cell.

In some embodiments of the present invention, the protrusion is formed by being turned over by 180 degrees after being connected with the positive electrode tab or the negative electrode tab from the second side.

In some embodiments of the present invention, an insulating material is attached to an outer surface of the second side.

In some embodiments of the present invention, the winding core connector further comprises a plurality of winding core positions adapted to receive the plurality of winding cores.

The utility model discloses an in some embodiments, still include apron, casing and bottom plate, wherein, the apron covers on the big face of electric core, the casing certainly the opposite side bearing of the big face of electric core the electric core structure, just the bottom plate be located with the opposite side that the electric core top cap is relative, the electric core top cap the apron the casing with the airtight space is constituteed to the bottom plate, airtight space is used for sealing a plurality of book cores.

In some embodiments of the invention, the housing has a protruding portion adapted to semi-surround the protruding portion.

In order to solve the technical problem, the utility model provides a battery module, including aluminium row, fan, BMS board and a plurality of electric core, a plurality of electric cores have before the electric core structure, wherein, the BMS board the aluminium row with the fan is located in proper order top cap one side of a plurality of electric cores.

The utility model discloses an in some embodiments, still include module bottom plate and bandage, a plurality of electric cores are placed on the module bottom plate and pass through the bandage is fixed.

In some embodiments of the present invention, in the plurality of battery cells, each at least two battery cells constitute a battery cell unit, and the number of the aluminum row and the number of the fans are plural, wherein each of the battery cells in the battery cell unit is fixed by at least one section of binding tape, and each of the battery cell units corresponds to a set of aluminum row and fan.

Compared with the prior art, the utility model has the advantages of it is following:

the utility model discloses a roll up core in the electric core structure and lay side by side can realize in length direction dilatation, and electric core appearance possesses long, thin characteristic, increases heat radiating area by a wide margin; the L-shaped flow guide structure greatly improves the welding width of the lug, improves the overcurrent capacity of the winding core and reduces the impedance of the battery core; the utility model discloses a battery module turns over the bellying that turns over the formation of book at big face through utmost point ear welding and switching piece and assists in the module design and form the wind channel, and the auxiliary component of wind channel design among the module can be saved in the design that this kind of electric core appearance self-assembly formed the wind channel structure, helps reducing originally.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the principle of the invention. In the drawings:

fig. 1 is an exploded view of a cell structure according to an embodiment of the present invention;

fig. 2A is a schematic structural diagram of a winding core 10 according to an embodiment of the present invention;

fig. 2B is a schematic view of a welding structure of the L-shaped adapter sheet and the tab of the winding core in fig. 1;

fig. 3 is a schematic perspective view of a cell structure according to an embodiment of the present invention;

fig. 4 is an exploded view of a battery module according to an embodiment of the present invention;

fig. 5 is a schematic view illustrating a self-assembly air duct structure of a battery module according to an embodiment of the present invention;

FIG. 6 is an enlarged partial schematic view of portion I of FIG. 5;

fig. 7 is a schematic structural diagram of a battery module according to an embodiment of the present invention.

Detailed Description

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings used in the description of the embodiments will be briefly introduced below. It is obvious that the drawings in the following description are only examples or embodiments of the application, from which the application can also be applied to other similar scenarios without inventive effort for a person skilled in the art. Unless otherwise apparent from the context, or stated otherwise, like reference numbers in the figures refer to the same structure or operation.

As used in this application and the appended claims, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are intended to be inclusive in the plural unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that steps and elements are included which are explicitly identified, that the steps and elements do not form an exclusive list, and that a method or apparatus may include other steps or elements.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present application, it is to be understood that the directions or positional relationships indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the directions or positional relationships shown in the drawings, and are for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be construed as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

For ease of description, spatially relative terms such as "over 8230 \ 8230;,"' over 8230;, \8230; upper surface "," above ", etc. may be used herein to describe the spatial relationship of one device or feature to another device or feature as shown in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary terms "at 8230; \8230; above" may include both orientations "at 8230; \8230; above" and "at 8230; \8230; below". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited. Further, although the terms used in the present application are selected from publicly known and used terms, some of the terms mentioned in the specification of the present application may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein. Further, it is required that the present application is understood not only by the actual terms used but also by the meaning of each term lying within.

It will be understood that when an element is referred to as being "on," "connected to," "coupled to" or "contacting" another element, it can be directly on, connected or coupled to or contacting the other element or intervening elements may be present. In contrast, when an element is referred to as being "directly on," "directly connected to," "directly coupled to" or "directly contacting" another element, there are no intervening elements present. Similarly, when a first component is said to be "in electrical contact with" or "electrically coupled to" a second component, there is an electrical path between the first component and the second component that allows current to flow. The electrical path may include capacitors, coupled inductors, and/or other components that allow current to flow even without direct contact between the conductive components.

Fig. 1 is an exploded view of a battery cell structure 100 according to an embodiment of the present invention. As shown in fig. 1, the cell structure 100 includes a plurality of winding cores 10, a first L-shaped interposer 21, a second L-shaped interposer 22, and a cell top cover 30. In the present embodiment, the cell structure 100 includes four battery cells 10. Opposite ends of each winding core 10 in the first direction D1 have a first tab 101 and a second tab 102, respectively. The first tab 101 may be configured as a positive tab or a negative tab, and the second tab 102 has a polarity opposite to that of the first tab 101. The four winding cores 10 are sequentially and adjacently arranged along the second direction D2, and the first direction D1 is perpendicular to the second direction D2. The number of the winding cores 10 included in the cell structure 100 can be set as required, and the application does not limit the number of the winding cores 10. The surfaces of the four winding cores 10 form a cell large surface H. The first L-shaped interposer 21 has a first side 211 extending along the first direction D1 and a second side 212 extending along the second direction D2. Second L-shaped interposer 22 has first side 221 extending in first direction D1 and second side 222 extending in second direction D2. The initial state of the first tab 101 and the second tab 102 is parallel to the large cell surface H, the initial state of the first L-shaped interposer 21 is also parallel to the large cell surface H, after the second edge 212 is connected to the first tabs 101 of the four winding cores 10, the first L-shaped interposer 21 is turned over by 90 degrees so that the second edge 212 and the first tabs 101 are perpendicular to the large cell surface H, and then the first L-shaped interposer 21 is turned over by 90 degrees so that the second edge 212 and the first tabs 101 are attached to the large cell surface H, that is, after the second edge 212 is connected to the first tabs 101 of the four winding cores 10, the second edge 212 is turned over by 180 degrees and attached to the large cell surface H. At this time, the first edge 211 of the first L-shaped interposer 21 is parallel to the cell large surface H, and the first edge 211 is turned by 90 ° around the cell top cap 30, so that the first edge 211 is attached to the cell top cap 30. The second L-shaped interposer 22 is also parallel to the cell large surface H in the initial state, the second edge 222 is connected to the second electrode tab 102 of the four winding cores 10 and then turned over by 90 ° so that the second edge 222 and the second electrode tab 102 are perpendicular to the cell large surface H, and then the second L-shaped interposer 22 is turned over by 90 ° so that the second edge 222 and the second electrode tab 102 are attached to the cell large surface H, that is, the second edge 222 is connected to the second electrode tab 102 of the four winding cores 10 and then turned over by 180 ° so as to be attached to the cell large surface H. At this time, the first edge 221 of the second L-shaped interposer 22 is parallel to the cell large surface H, and the first edge 221 is turned by 90 ° around the cell top cap 30, so that the first edge 221 is attached to the cell top cap 30. The cell cap 30 covers the first edge 211 and the first edge 221. The cell cap 30 includes a first pole column 301, a second pole column 302, and an explosion-proof valve 303. The first pole 301 is connected to the first side 211, and the second pole 302 is connected to the first side 221, so that the current or voltage in the winding core 10 is guided from the pole ear to the L-shaped patch and then to the pole. The first tab 101 and the second tab 102 in fig. 1 are turned 180 °. The second edge 212 and the second edge 222 are higher than the cell large surface H, and two protrusions are formed on the cell large surface H, so that a region other than the two protrusions forms a groove on the cell large surface H.

Fig. 2A is a schematic structural diagram of a winding core 10 according to an embodiment of the present invention. Fig. 2B is a schematic view of a welding structure of the L-shaped adapter sheet and the tab of the winding core in fig. 1. The winding core 10 in fig. 2A is a structural view in an initial state, and the winding core 10 has a first tab 101 and a second tab 102 as shown in fig. 2A. The initial state of the first tab 101 and the second tab 102 is parallel to the cell large surface H. For the sake of clarity, only the first L-shaped interposer 21 is shown in fig. 2B, and the second L-shaped interposer 22 in fig. 1 is not shown, in order to illustrate the state of the L-shaped interposer and the state of the tab after the L-shaped interposer and the tab of the winding core are welded and inverted. As shown in fig. 2B, the first L-shaped interposer 21 has a first side 211 extending along the first direction D1 and a second side 212 extending along the second direction D2. The second edge 212 is connected with the first tabs of the four winding cores 10 and then turned over by 180 degrees to be attached to the large cell surface H. The first tabs of the four winding cores 10 are covered by the second edge 212 as seen in fig. 2B, and therefore the first tabs of the four winding cores 10 are not shown in fig. 2B. The second edge 212 is higher than the cell large surface H, and a protrusion is formed on the cell large surface H. After the connection is turned over by 180 °, the second tab 102 of each winding core 10 is also attached to the cell large surface H.

As shown in fig. 1, the battery cell structure 100 further includes a winding core connector 40, an insulating material, a casing 60, a cover plate 70, and a bottom cover plate 80. The winding core connecting member 40 has winding core positions 401 corresponding to the number of winding cores, and the winding core positions 401 are isolated from each other. When each core 10 is placed in each core rolling position 401, no direct contact between the core is realized, and when a single core is out of control due to heat, other core can not be influenced by rapid spreading. And the relative position between the winding cores 10 and the shell 60 can be fixed. The housing 60 has a protruding portion 601 and a protruding portion 602, and the protruding portion 601 and the protruding portion 602 are respectively used for half-surrounding the protruding portion formed by the second side 212 and the second side 222, so that the final cell is concave in shape structure. The number of the insulating materials corresponds to the number of the L-shaped adaptor pieces, and in the present embodiment, the insulating materials include an insulating adhesive tape 51 and an insulating adhesive tape 52. The insulation adhesive paper 51 is located between the second side 212 and the protruding portion 601, and the insulation adhesive paper 52 is located between the second side 222 and the protruding portion 602, for insulating the second side 212 and the second side 222 from the housing 60. A plurality of book cores 10 are put into the book core connecting piece 40, the shell 60 supports the book core connecting piece 40, the cover plate 70 covers the cell large surface H, and the bottom cover plate 80 is positioned at the other side opposite to the cell top cover 30.

Fig. 3 is a schematic perspective view of a cell structure according to an embodiment of the present invention. The cell top cover 30, the cover plate 70, the casing 60 and the bottom cover plate 80 constitute a closed space for sealing a plurality of winding cores. The housing 60 has a protruding portion 601 and a protruding portion 602. The protruding portions 601 and 602 are higher than the cover plate 70, and finally, the cells are concave in shape structure. In some embodiments, the cover plate 70 is a PET plate.

The winding cores in the cell structure of the utility model can be arranged side by side to realize the expansion in the length direction (D2 direction in figure 1), and the cell appearance has the characteristics of long and thin, thereby greatly increasing the heat dissipation area; the L-shaped flow guide structure greatly improves the welding width of the tab, improves the overcurrent capacity of the winding core and reduces the resistance of the battery cell; the utility model discloses in shift the welded space occupy-place of utmost point ear and switching piece to electric core big face and form the arch, can improve width direction's space utilization by a wide margin.

Fig. 4 is an exploded view of a battery module 400 according to an embodiment of the present invention. As shown in fig. 4, the battery module 400 includes a plurality of battery cells 41, an aluminum row 42, a fan 43, and a battery management system board 44. The plurality of battery cells 41 have the cell structure 100 described above. In the plurality of battery cells 41, at least two battery cells constitute one battery cell unit 40. The battery module 400 includes at least one cell unit 40, and the number of the cell units 40 is not limited in the present application. The battery management system board 44, the fan 43 and the aluminum row 42 are sequentially located on one side of the unit cell top cover 411 to form an air-cooled module structure. The number of the aluminum bars 42 and the fans 43 is multiple, and each cell unit 40 corresponds to one set of the aluminum bars 42 and the fans 43.

Fig. 5 is a schematic view of a self-assembly air duct structure of a battery module according to an embodiment of the present invention. As shown in fig. 5, a one-dimensional insertion type is adopted when a plurality of battery cells 41 form a battery cell unit 40. The plurality of battery cells 41 are arranged in close proximity in sequence, and the air duct F is formed by matching between adjacent battery cells. Fig. 6 is a partially enlarged schematic view of a portion I in fig. 5. As shown in fig. 6, the plurality of battery cells 41 are arranged next to each other, and since the battery cells 41 are concave in the shape structure, the large surface a of one battery cell 41 between two adjacent battery cells 41 cooperates with the concave surface B of the other battery cell 41 to form an air duct F.

With continued reference to fig. 6, in some embodiments, the battery module 400 further includes a strap 45, and the cells 41 in each cell unit 40 are secured by at least one length of the strap 45.

In some embodiments, the battery module 400 further includes a module base plate 46, and the plurality of battery cells 41 are placed on the module base plate 46 and fixed by the binding bands 44.

Fig. 7 is a schematic structural diagram of a battery module 400 according to an embodiment of the present invention. As shown in fig. 7, a plurality of battery cells 41 form a battery cell unit 40, and the battery cell 41 in each battery cell unit 40 is fixed by two sections of binding bands 45. Battery module 400 includes a plurality of sets of cell units 40, with the plurality of sets of cell units 40 being disposed on module bottom plate 46. An air duct (not shown) is formed between adjacent battery cells 41 in each set of battery cell units 40, and the battery management system board 44 controls the start of the fan (not shown) according to the temperature of the whole battery module 400. The wind that the fan produced passes through the wind channel of adjacent electric core 41, keeps the flow of the inside air of module.

The battery module of the utility model assists in forming the air channel in module design by the lug welding and the turnover of the switching piece, and the design of the air channel structure formed by self-assembling the appearance of the battery cell can save the auxiliary component of the air channel design in the module, thus being beneficial to reducing cost; the problem of low space utilization rate caused by the protruding part of the battery cell is avoided by constructing the air duct structure at the module level.

Having thus described the basic concept, it will be apparent to those skilled in the art that the foregoing disclosure is by way of example only, and is not intended to limit the present application. Various modifications, improvements and adaptations to the present application may occur to those skilled in the art, although not explicitly described herein. Such modifications, improvements and adaptations are proposed in the present application and thus fall within the spirit and scope of the exemplary embodiments of the present application.

Also, this application uses specific language to describe embodiments of the application. Reference throughout this specification to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic described in connection with at least one embodiment of the present application is included in at least one embodiment of the present application. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, some features, structures, or characteristics of one or more embodiments of the present application may be combined as appropriate.

Similarly, it should be noted that in the preceding description of embodiments of the present application, various features are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the embodiments. This method of disclosure, however, is not intended to require more features than are expressly recited in the claims. Indeed, the embodiments may be characterized as having less than all of the features of a single embodiment disclosed above.

Numerals describing the number of components, attributes, etc. are used in some embodiments, it being understood that such numerals used in the description of the embodiments are modified in some instances by the use of the modifier "about", "approximately" or "substantially". Unless otherwise indicated, "about", "approximately" or "substantially" indicates that the number allows a variation of ± 20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximations that may vary depending upon the desired properties of the individual embodiments. In some embodiments, the numerical parameter should take into account the specified significant digits and employ a general digit preserving approach. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the range are approximations, in the specific examples, such numerical values are set forth as precisely as possible within the scope of the application.

Although the present application has been described with reference to the present specific embodiments, it will be recognized by those skilled in the art that the foregoing embodiments are merely illustrative of the present application and that various changes and substitutions of equivalents may be made without departing from the spirit of the application, and therefore, it is intended that all changes and modifications to the above-described embodiments that come within the spirit of the application fall within the scope of the claims of the application.

Claims (9)

1. The utility model provides a battery cell structure, has the big face of battery cell and battery cell top cap, its characterized in that, battery cell structure includes:

the winding structure comprises a plurality of winding cores, a winding core and a winding core, wherein the two ends of each winding core in a first direction are respectively provided with a positive electrode lug and a negative electrode lug, and the plurality of winding cores are sequentially and adjacently arranged along a second direction perpendicular to the first direction; and

the L-shaped adapter plate is provided with a first edge extending along the first direction and a second edge extending along the second direction, wherein the first edge is connected with the cell top cover, and the second edge is connected with the positive pole lugs or the negative pole lugs of the plurality of winding cores and then attached to the large surface of the cell to form a bulge part on the large surface of the cell, so that a groove is formed in an area outside the bulge part on the large surface of the cell.

2. The cell structure of claim 1, wherein the protrusion is formed from the second edge flipped 180 degrees after connection with the positive or negative electrode tab.

3. The cell structure of claim 1 or 2, wherein an insulating material is adhered to an outer surface of the second edge.

4. The cell structure of claim 1, further comprising a winding core connector having a plurality of winding core sites adapted to receive the plurality of winding cores.

5. The cell structure of claim 1 or 4, further comprising a cover plate, a casing, and a bottom cover plate, wherein the cover plate covers the large cell surface, the casing supports the cell structure from another side of the large cell surface, and the bottom cover plate is located at another side opposite to the top cell cover, and the top cell cover, the cover plate, the casing, and the bottom cover plate form a sealed space, and the sealed space is used for sealing the plurality of winding cores.

6. The cell structure of claim 5, wherein the casing has a protrusion adapted to semi-surround the protrusion.

7. A battery module is characterized by comprising an aluminum bar, a fan, a BMS board and a plurality of battery cells, wherein the battery cells are provided with the battery cell structures as claimed in any one of claims 1 to 6, and the BMS board, the aluminum bar and the fan are sequentially arranged on one side of top covers of the battery cells.

8. The battery module of claim 7, further comprising a module base plate and a strap, wherein the plurality of cells are placed on the module base plate and secured by the strap.

9. The battery module of claim 8, wherein each of the at least two cells in the plurality of cells constitutes a cell unit, and the number of the aluminum bars and the fans is multiple, wherein the cells in each cell unit are fixed by at least one section of binding tape, and each cell unit corresponds to one set of the aluminum bars and the fans.

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