CN220420764U

CN220420764U - Battery pack using long battery cell

Info

Publication number: CN220420764U
Application number: CN202321991293.5U
Authority: CN
Inventors: 黄毅轩; 唐丽娟
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2023-07-26
Filing date: 2023-07-26
Publication date: 2024-01-30
Anticipated expiration: 2033-07-26

Abstract

The utility model relates to the technical field of new energy batteries, and particularly discloses a battery pack applying a long battery cell, which comprises the following components: a battery housing, a cell component, and a bus bar; the two ends of the busbar are provided with preset angles in an initial state; the two battery core components are respectively connected to the two side connecting ends of the busbar, and the busbar can be bent to an assembly angle to form a long battery core module; the long battery modules are electrically connected to form a battery module and are arranged in the battery shell; the busbar is set to be an initial angle convenient for welding operation, so that the welding operation can be performed on the battery core component and the busbar, the busbar is bent to an assembly angle after welding is finished, a large welding gap is not required to be reserved, the space utilization rate of the battery pack is improved, and the energy density of the battery pack is further improved; and more convenient welding operation's going on is favorable to promoting welding efficiency, and then promotes battery package production efficiency greatly.

Description

Battery pack using long battery cell

Technical Field

The utility model relates to the technical field of new energy batteries, in particular to a battery pack applying a long battery cell.

Background

The modern automotive industry is revolutionarily changing, namely, the traditional fuel automobiles are gradually replaced by new energy automobiles, wherein pure electric automobiles are emerging as one of the new energy automobiles, and many transmission fuel automobile platforms directly change the power source of the automobiles from fuel to a battery by changing the engine structure to a power battery pack structure. With the emergence of new energy automobiles in the market, people have higher demands on the endurance of the electric automobiles, the same battery core parameters mean that more battery cores are required to be arranged in a battery pack of the electric automobiles with higher endurance mileage, and the matrix battery pack can greatly improve the utilization rate of the battery pack and the endurance mileage of the whole automobile.

When the length of the used battery core is less than half of the width of the whole battery pack, the matrix battery pack in the current market is insufficient in utilization of the whole battery pack in the width direction of the whole battery pack, and the electric quantity of the whole battery pack cannot be further improved. And there is not interconnect between the electric core, causes whole package width direction axis position, and rigidity is poor, needs more structure to promote whole package rigidity, and the assembly is complicated, and is with high costs to sacrifice the space inside the battery package, reduced volume utilization, be unfavorable for promoting the energy density of battery package. The battery cells in the battery pack are generally connected into a module through a bus bar and are fixed through welding; however, the traditional bus bar is fixed in shape, and the battery cells are required to be placed into a final shape and then uniformly welded; however, the intervals between the opposite battery cells are often very small, and the welding operation has great difficulty; if the interval is increased, the space utilization rate of the battery pack cannot be ensured, and the battery pack is difficult to be fully utilized.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems in the related art to some extent.

Therefore, the embodiment of the utility model provides a battery pack with a long battery cell, which solves the problems of low space utilization rate of the battery pack and high welding difficulty of a battery cell component and a bus bar.

A battery pack using a long cell according to an embodiment of the present utility model includes: a battery housing, a cell component, and a bus bar; wherein,

the cell component is provided with a plurality of cells; the two ends of the busbar are provided with preset angles in an initial state; the two electric core components are respectively connected to the two side connecting ends of the bus bar, and the bus bar can be bent to an assembling angle to form a long electric core module; and the long battery modules are electrically connected to form a battery module and are arranged in the battery shell.

In the scheme of the utility model, the busbar is set to be an initial angle convenient for welding operation, so that the welding operation can be performed on the battery core component and the busbar, the busbar is bent to an assembly angle after welding is finished, a large welding gap is not required to be reserved, the space utilization rate of the battery pack is improved, and the energy density of the battery pack is further improved; and more convenient welding operation's going on is favorable to promoting welding efficiency, and then promotes battery package production efficiency greatly.

In the preferred scheme of the battery pack applying the long battery cells, the battery pack further comprises a battery cell connecting piece, wherein the battery cell connecting piece is connected between the two battery cell components of the long battery cell module and corresponds to the bus bar.

In the above preferred embodiment of the battery pack using long cells, the cell connector includes: a plug female component and a plug male component; wherein,

the plug-in female component is connected to the connecting end of one of the battery core components of the long battery core module; the plug-in male component is connected to the connecting end of the other cell component of the long cell module; after the busbar is bent, the plug-in male component can be connected with the plug-in female component.

In the above preferred embodiment of the battery pack using long cells, the outer wall of the battery case has a length of W ₁ The length of the inner wall of the battery shell is W ₂ The method comprises the steps of carrying out a first treatment on the surface of the The total length of the long battery core module is L ₀ The method comprises the steps of carrying out a first treatment on the surface of the The sum of the lengths of two cell components in the long cell module is L ₁ The method comprises the steps of carrying out a first treatment on the surface of the Wherein,

and/or

And/or

In the above preferred embodiment of the battery pack using a long battery cell, the length of the battery cell member is c; the height of the battery cell component is b; wherein,

c＝350～1000mm；

and/or b.ltoreq.160 mm.

In the above preferred solution of the battery pack using long cells, a gap h is provided between the opposing cell members in adjacent long cell modules, and is filled with a spacer; the thickness of the battery cell component is a; wherein h is more than or equal to 0.1mm, and h is more than or equal to 0.2a.

In the above preferred embodiment of the battery pack using long cells, the cell shoulder distance of the cell members opposing each other in the long cell module is 4 to 60mm.

In the above preferred embodiment of the battery pack using long cells, the long cells are arranged in the thickness direction of the cell members; the positive pole and the negative pole of the long battery cell module are respectively arranged on the end surfaces of the two ends.

In the preferred scheme of the battery pack using the long battery cell, the bottom wall of the battery cell component in the long battery cell module is adhered to the water cooling plate in the battery cell shell, and the adhering area accounts for 60% -80% of the area of the bottom wall;

and/or the top wall of the cell component in the long cell module is adhered to the top plate of the cell shell, and the adhering area accounts for 60% -80% of the area of the top wall.

In the above preferred scheme of the battery pack using the long battery cell, the bottom plate of the battery cell housing is provided with a vertical reinforcing rib, and the vertical reinforcing rib and the explosion-proof valve of the battery cell component are arranged in a staggered manner.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. Other features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic view showing the internal structure of a battery pack using a long cell.

Fig. 2 is a top view of fig. 1.

Fig. 3 is an exploded view of the battery pack shown using long cells.

Fig. 4 is a schematic connection diagram of the initial state of the cell components in the battery pack to which the long cells are applied.

Fig. 5 is a top view of fig. 4.

Fig. 6 is a schematic illustration of the connection of the cell components after bending in a battery pack using long cells.

Fig. 7 is a schematic view of an initial state of a bus bar in a battery pack using a long cell.

Fig. 8 is a schematic diagram of a bent state of a bus bar in a battery pack using a long cell.

Fig. 9 is a schematic diagram of one embodiment of a cell connector in a battery pack employing long cells.

Reference numerals:

1. a cell component; 10. a long cell module; 2. a busbar; 30. a lower housing; 300. a frame structure; 301. a floor member; 31. a top cover; 32. a water cooling plate; 33. a BMS battery system; 34. a BDU battery energy distribution unit; 4. a cell connector; 40. a plug-in female component; 41. and (5) inserting the male component.

Detailed Description

The technical solutions of the present utility model will be clearly and completely described in connection with the embodiments, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the background art, when the length of the used battery cell is less than half of the width of the whole battery pack, the utilization of the whole battery pack in the width direction of the whole battery pack is insufficient, so that the electric quantity of the whole battery pack cannot be further improved. And there is not interconnect between the electric core, causes whole package width direction axis position, and rigidity is poor, needs more structure to promote whole package rigidity, and the assembly is complicated, and is with high costs to sacrifice the space inside the battery package, reduced volume utilization, be unfavorable for promoting the energy density of battery package. The battery cells in the battery pack are generally connected into a module through a bus bar and are fixed through welding; however, the traditional bus bar is fixed in shape, and the battery cells are required to be placed into a final shape and then uniformly welded; however, the intervals between the opposite battery cells are often very small, and the welding operation has great difficulty; if the interval is increased, the space utilization rate of the battery pack cannot be ensured, and the battery pack is difficult to be fully utilized.

In order to improve the problem, the application provides a battery pack with long battery cells, through the busbar of buckling, can be earlier with the terminal post of electric core part with the corresponding end of busbar at initial angle be connected, then buckle welded overall structure in busbar department, and then reduce the welding degree of difficulty.

Referring to fig. 1 to 9, a battery pack using a long cell according to an embodiment of the present application includes: a battery case, a cell unit 1, and a bus bar 2; wherein,

the cell member 1 is provided in plurality; the busbar 2 both ends are provided with the angle of predetermineeing at initial state, and two electric core parts 1 are connected in the both sides link of busbar 2 respectively to busbar 2 can buckle to assembly angle, forms a long electric core module 10, and a plurality of long electric core modules 10 are connected the back and are formed the battery module, set up side by side in the battery case.

Specifically, the battery case is a sealed case composed of a lower case 30 and a top cover 31, the lower case 30 includes a frame structure 300 and a bottom plate member 301, the bottom plate member 301 is provided with a water cooling plate 32, and a BMS battery system 33 and a BDU battery energy distribution unit 34 are provided.

Specifically, the bus bar 2 may be made of a conductive material such as copper that is conductive and bendable.

Specifically, the long cell modules 10 are arranged along the cell thickness direction of the cell component 1, after connection, a battery module is formed in the battery shell, and the positive and negative electrode posts of the long cell modules 10 are respectively arranged on the end surfaces of the two ends and are electrically connected; the poles of the long cell module 10 are arranged at two ends and are 2-30 mm away from the top end face of the cell component 1.

Specifically, the two cell units 1 that make up the long cell module 10 may be the same type or different types, and a suitable connection pitch may be selected according to the size, and adaptive connection may be performed according to the positions of the poles of the cell units 1 of the specific type.

Specifically, a cross beam can be added in the battery shell, so that the constraint mode can be more than 500Hz, and the overall rigidity of the battery pack is further enhanced

Specifically, the initial state of the busbar 2 may be set to an L-shaped structure, a bent portion is provided at a corner, a preset angle for facilitating welding operation is formed in the middle, and the preset angle may be preferably 90 °; after the welding is finished, the bending part in the middle of the busbar 2 is bent to form a U-shaped structure, at this time, the two cell components 1 connected with the same busbar 2 are oppositely arranged and are parallel in the length direction, and the distance between the connecting walls on two sides of the busbar 2 after bending is preferably 0.2-20 mm.

Specifically, both connecting ends of the busbar 2 are provided with weld beads for welding and fixing the pole and the busbar 2.

Specifically, the edges of the bent bus bars 2 are located in the edge lines of the opposite planes of the two cell components 1, and do not protrude out of the planes of the cell components 1, so that the long cell modules 10 of multiple groups are not affected to form a battery module, and the extra space in the cell shell is not occupied, thereby being beneficial to improving the energy density of the battery pack.

In the scheme of the utility model, the busbar 2 is set to be an initial angle convenient for welding operation, so that the welding operation can be performed on the battery core and the busbar 2, and the busbar 2 is bent to an assembly angle after the welding is finished, so that a larger welding gap is not required to be reserved, the space utilization rate of the battery pack is improved, and the energy density of the battery pack is further improved; and more convenient welding operation's going on is favorable to promoting welding efficiency, and then promotes battery package production efficiency greatly.

In the preferred embodiment of the battery pack using long cells, the battery pack further includes a cell connector 4, and the cell connector 4 is connected between two cell members 1 in the long cell module 10, corresponding to the bus bar 2.

In a specific embodiment, the cell connector 4 comprises: a female plug 40 and a male plug 41; wherein,

the plug-in female connector 40 is connected to the connecting end of one of the cell components 1 of the long cell module 10; the plug-in male component 41 is connected to the connecting end of the other cell component 1 of the long cell module 10; after bending of the busbar 2, the plug-in male part 41 can be connected to the plug-in female part 40.

Specifically, one end of the plug female member 40 is connected to the corresponding cell member 1, the other end thereof is provided with a plug hole, and one end of the plug male member 41 is connected to the corresponding cell member 1, so that the plug male member can be inserted into the plug hole when the busbar 2 is bent and deformed.

Specifically, the female plug connector 40 and the male plug connector 41 may be interference fit, or may be clearance fit, and when a clearance fit connection method is adopted, further reinforcement can be performed by welding, bonding, or the like.

In a specific embodiment, the electric core connecting piece 4 can also be a hollow connecting block, and the weight of the battery pack can be reduced by adopting a hollow structure; the cell connector 4 is preferably a profile with a cross-section in the shape of a Chinese character 'ri', the two side connecting surfaces of which are fixed between two corresponding cell components 1 by means of gluing.

It should be understood that the cell connector 4 can connect the opposite cell components 1 into a whole, so as to connect the long cell modules 10 into a whole, thereby increasing the overall rigidity of the central axis part of the battery pack; the cell connecting piece 4 can also limit the interval distance between the opposite cell components 1 in the long cell module 10, so that the problems of deformation and the like of the busbar 2 caused by the change of the interval distance are avoided, and the quality of the battery pack is influenced; the structure design is simple, easy to realize, low in assembly difficulty and low in cost.

In the preferred embodiment of the battery pack using the long cells, the outer wall of the battery case has a length of W ₁ The length of the inner wall of the battery shell is W ₂ The method comprises the steps of carrying out a first treatment on the surface of the The total length of the long cell module is L ₀ ；

Wherein,and/or +.>

Specifically, when the total length of the long cell module 10 is L ₀ Parallel to W ₁ At the time W ₁ Parallel to the advancing direction of the whole vehicle.

In particular, the method comprises the steps of,preferably 0.97.

The length of the cell element 1 is c (excluding the two side poles), the width is a, and the height is b; the total length of the long cell module 10 is L ₀ Is the sum of the lengths of the two opposing cell units 1, the cell shoulder spacing of the two cell units 1 and the lengths of the two poles on the outer sides of the two opposing cell units 1.

Specifically, in the embodiment of the present utility model, the length c of the cell unit 1 is preferably 350 to 1000mm; the height b is less than or equal to 160mm, and the total length L of the long battery cell module 10 ₀ 730-2500 mm.

Above-mentioned electric device using long cellIn the preferred embodiment of the cell pack, the sum of the lengths of the two cell units 1 in the long cell module 10 is L ₁ ，L ₁ Preferably L ₁ ＝2c； Preferably 0.95.

The sum of the lengths of the two cell units 1 in the long cell module 10 is L ₁ Is the sum of the lengths of the two opposite cell units 1.

In the above preferred embodiment of the battery pack employing long cells, a gap h is provided between the opposing cell members 1 in the adjacent long cell modules 10, and is filled with a spacer; the thickness of the cell component 1 is a; wherein h is more than or equal to 0.1mm, and h is more than or equal to 0.2a.

In the above preferred embodiments of the battery pack employing long cells, the cell shoulder spacing in the long cell module 10 relative to the cell component 1 is 4-60 mm or 8-60 mm; if the cell shoulder distance is too small, the cells cannot be grouped, and if the cell shoulder distance is too large, the energy density of the battery pack is affected.

In the preferred embodiment of the battery pack using the long battery cell, the bottom wall of the battery cell part 1 in the long battery cell module 10 is adhered to the water cooling plate 32 in the battery cell shell, and the adhering area occupies 60% -80% of the area of the bottom wall;

and/or the top wall of the cell component 1 in the long cell module 10 is adhered to the top plate of the cell shell, and the adhering area accounts for 60-80% of the area of the top wall.

Specifically, the bottom wall of the cell unit 1 and the water cooling plate 32 in the cell case are bonded and fixed by a heat conductive structural adhesive, and the heat conductivity is not higher than 5W/(m·k).

Through above-mentioned scheme, can guarantee the joint strength of electric core spare 1 and battery case, further promote whole rigidity to guarantee radiating effect.

In the preferred embodiment of the battery pack using the long battery cell, the bottom plate of the battery cell shell is provided with the vertical reinforcing rib, and the vertical reinforcing rib and the explosion-proof valve of the battery cell component 1 are arranged in a staggered manner, namely, the vertical reinforcing rib and the battery cell explosion-proof valve are not overlapped in the Z-direction projection direction, so that the blocking of the reinforcing rib after the explosion of the explosion-proof valve and the ejection of fluid substances is avoided, and the influence on the structural strength of the battery pack is avoided.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.

Claims

1. A battery pack employing a long cell, comprising:

a battery case;

a plurality of cell members;

the bus bar, the said bus bar both ends are set up with the preset angle in the initial state; the two electric core components are respectively connected to the two side connecting ends of the bus bar, and the bus bar can be bent to an assembling angle to form a long electric core module; and the long battery modules are electrically connected to form a battery module and are arranged in the battery shell.

2. The battery pack of claim 1, further comprising a cell connector connected between two of the cell members of the long cell module, corresponding to the bus bar.

3. The battery pack using long cells as claimed in claim 2, wherein the cell connector comprises:

the plug-in female component is connected to the connecting end of one of the battery core components of the long battery core module;

the plug-in male component is connected to the connecting end of the other cell component of the long cell module; after the busbar is bent, the plug-in male component can be connected with the plug-in female component.

4. The battery pack using long cells according to claim 2, wherein the outer wall length of the battery case is W ₁ The length of the inner wall of the battery shell is W ₂ The method comprises the steps of carrying out a first treatment on the surface of the The total length of the long battery core module is L ₀ The method comprises the steps of carrying out a first treatment on the surface of the The sum of the lengths of two cell components in the long cell module is L ₁ The method comprises the steps of carrying out a first treatment on the surface of the Wherein,

and/or

And/or

5. A battery pack employing long cells as in claim 4, wherein the cell units have a length c; the height of the battery cell component is b; wherein,

c＝350～1000mm；

and/or b.ltoreq.160 mm.

6. A battery pack employing long cells according to claim 5, wherein a gap h is provided between the opposing cell members in adjacent long cell modules, and is filled with a spacer; the thickness of the battery cell component is a; wherein h is more than or equal to 0.1mm, and h is more than or equal to 0.2a.

7. A battery pack employing long cells as claimed in claim 6, wherein the cell shoulder spacing of the opposing cell members in the long cell module is 4-60 mm.

8. A battery pack employing long cells according to any one of claims 1-7, wherein the long cells are arranged in the thickness direction of the cell members; the positive pole and the negative pole of the long battery cell module are respectively arranged on the end surfaces of the two ends.

9. The battery pack using the long battery cell according to claim 8, wherein the bottom wall of the battery cell component in the long battery cell module is adhered to the water cooling plate in the battery cell shell, and the adhering area occupies 60% -80% of the area of the bottom wall;

10. The battery pack using the long electric core as claimed in claim 1, wherein the bottom plate of the electric core shell is provided with vertical reinforcing ribs, and the vertical reinforcing ribs and the explosion-proof valve of the electric core component are arranged in a staggered manner.