CN221176379U - Battery cell and battery pack - Google Patents

Abstract

The utility model relates to the technical field of batteries, in particular to a battery cell and a battery pack, wherein the battery cell comprises a shell, a battery cell body, a positive electrode pole, an explosion-proof valve and a negative electrode pole, the battery cell body is arranged in the shell, the positive electrode pole, the explosion-proof valve and the negative electrode pole are all arranged at the right end of the shell, and the battery cell also comprises a heat radiation component and a plug-in component; the heat dissipation component is coated on the periphery of the shell; the plug-in assembly comprises a limit bar and a plug pin, wherein the limit bar is arranged at the upper end of the shell, and the plug pin is arranged at the lower end of the shell; the limiting strip is provided with the slot which is in plug-in fit with the plug pin, so that the volume energy density of the battery pack can be improved, and the safety performance of the battery pack can be ensured.

Description

Battery cell and battery pack

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery cell and a battery pack.

Background

The battery pack mainly comprises a battery cell module and a box body. The battery cell module comprises a plurality of closely arranged battery cells, and the bottom of each battery cell is adhered and fixed with the box body during assembly. Along with the increase of battery monomer quantity in the electric core module, need set up the roof beam structure in order to support spacing to electric core module from the side of electric core module in the inside of box to guarantee the overall structure intensity of electric core module and battery package.

However, the beam structure occupies space inside the case, resulting in a decrease in the volumetric energy density of the battery pack.

Disclosure of utility model

Aiming at the defects existing in the prior art, the utility model aims to provide a battery cell and a battery pack, which can improve the volume energy density of the battery pack and ensure the safety performance of the battery pack.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the battery cell comprises a shell, a battery cell body, a positive electrode pole, an explosion-proof valve and a negative electrode pole, wherein the battery cell body is arranged in the shell, the positive electrode pole, the explosion-proof valve and the negative electrode pole are all arranged at the right end of the shell, and the battery cell further comprises a heat radiation component and an inserting component; the heat dissipation component is coated on the periphery of the shell; the plug-in assembly comprises a limit bar and a plug pin, wherein the limit bar is arranged at the upper end of the shell, and the plug pin is arranged at the lower end of the shell; the limiting strip is provided with a slot which is in plug-in fit with the plug pin.

Preferably, the bolt is in a strip structure.

Preferably, the bolt is of a columnar structure.

Preferably, the heat dissipation assembly comprises a plurality of first heat dissipation strips and a plurality of second heat dissipation strips; the first radiating strips are uniformly distributed on the upper end face and the lower end face of the shell; the second radiating strips are uniformly distributed on the side surface of the shell; the height of the limiting strip is consistent with that of the first radiating strip, and the height of the bolt is larger than that of the first radiating strip.

Preferably, the first heat dissipating strip is laid along the length direction of the housing.

Preferably, the second heat sink strip is laid longitudinally on a side of the housing.

Preferably, the height of the latch is twice the height of the first heat sink bar.

The battery pack comprises a lower box body, an upper box body and a plurality of battery cells, wherein the lower box body and the upper box body are connected to form a fixed cavity, and the battery cells are stacked in the fixed cavity.

Preferably, the battery cell is bonded with the lower box body and the upper box body.

Preferably, the battery pack further includes a bus bar; the plurality of battery cells are connected in series through the bus bars.

Compared with the prior art, the utility model has the beneficial effects that: through setting up spacing, first heat dissipation strip, second heat dissipation strip and bolt on the electric core, spacing and bolt grafting cooperation for stacking between the electric core need not to realize also can guaranteeing the stability of structure after stacking with the help of the roof beam structure, and simultaneously the existence of first heat dissipation strip, second heat dissipation strip makes the electric core stack the back, forms a plurality of heat dissipation channels between the electric core, can avoid the electric core to stack up from top to bottom and be in the same place the back inside heat accumulation from this, has not only improved battery package volumetric energy density, has still guaranteed the security performance of battery package.

Drawings

FIG. 1 is a schematic diagram of the upper side of a cell of the present utility model;

Fig. 2 is a schematic view of the structure of the lower side of the battery cell according to the present utility model;

fig. 3 is a schematic diagram of an assembly structure of two adjacent cells in the upper and lower directions;

Fig. 4 is a schematic view of a horizontal assembled cell structure according to the present utility model;

Fig. 5 is a schematic view showing the internal structure of the battery pack according to the present utility model;

FIG. 6 is a schematic diagram of the structure of FIG. 5A according to the present utility model;

FIG. 7 is a schematic view of a stacked cell structure in a battery pack according to the present utility model;

fig. 8 is a schematic diagram of a lower side structure of a battery cell according to a second embodiment of the utility model.

In the figure: the battery comprises a battery core 1, a shell 11, a limit bar 12, a slot 121, a first heat dissipation bar 13, a heat dissipation channel 131y, a second heat dissipation bar 14, a heat dissipation channel 141z, a positive electrode pole 15, an explosion-proof valve 16, a negative electrode pole 17 and a plug 18.

Detailed Description

The following detailed description of the utility model, taken in conjunction with the accompanying drawings, will provide those skilled in the art with a more readily understood understanding of how the utility model may be practiced. While the present utility model has been described in connection with the preferred embodiments thereof, these embodiments are set forth only and are not intended to limit the scope of the utility model.

In the present application, the x-direction is the front-to-rear direction, the y-direction is the left-to-right direction, and the z-direction is the bottom-to-top direction.

First embodiment: referring to fig. 1-4, a cell, comprising: the battery cell comprises a shell 11, a battery cell body (not shown in the figure), a limit strip 12, a first heat dissipation strip 13, a second heat dissipation strip 14, a positive pole 15, an explosion-proof valve 16, a negative pole 17 and a bolt 18, wherein the shell 11 is of a box-shaped structure which is formed by surrounding an upper end plate, a lower end plate, a left end plate, a right end plate, a front end plate and a rear end plate and is internally provided with a cavity, the cavity of the shell 11 is used for accommodating substances such as the battery cell body, electrolyte and the like, and the shell 11 can be made of metal materials and can conduct heat and dissipate heat better; the positive pole 15, the explosion-proof valve 16 and the negative pole 17 are arranged on the right end plate of the shell 11 at intervals; the two limiting strips 12 and the two bolts 18 are arranged, the two limiting strips 12 are paved on the upper end plate, and the length direction of the two limiting strips 12 is the same as the length direction of the upper end plate; the two limiting strips 12 are provided with slots 121, and the openings of the two slots 121 are opposite; the two bolts 18 are arranged on the lower end plate, the positions of the two bolts 18 are in one-to-one correspondence with the positions of the two slots 121, and meanwhile, the sizes of the bolts 18 are mutually matched with the sizes of the slots 121;

The first heat dissipation strips 13 are provided with a plurality of first heat dissipation strips 13, the first heat dissipation strips 13 are paved on the upper end plate and the lower end plate along the y direction, and the first heat dissipation strips 13 are uniformly distributed; the first heat dissipation strips 13 are positioned between the two limiting strips 12 on the upper end plate, and the first heat dissipation strips 13 are positioned between the two bolts 18 on the lower end plate; the second heat dissipation strips 14 are formed by a plurality of second heat dissipation strips 14 which are uniformly distributed on the left end plate, the front end plate and the rear end plate, and the second heat dissipation strips 14 are paved along the z direction;

In this embodiment, the height of the limiting bar 12 is identical to the height of the first heat dissipating bar 13, and the height of the latch 18 is twice the height of the first heat dissipating bar 13.

As shown in fig. 3, when two electrical cores are stacked up and down, two pins 18 are located at the inner sides of two limiting bars 12, and three of four side walls of the pins 18 are abutted against the inner walls of the slots 121; because of the limit of the slot 121, the relative displacement of the two battery cells in the horizontal direction is limited, but the longitudinal stacking or separation is not limited, so that the battery cells are not required to be additionally provided with a beam mounting structure to keep the stacking stable when being stacked up and down; meanwhile, the first radiating strips 13 on the battery cells at the upper and lower positions are mutually pressed and connected, a plurality of y-direction radiating channels 131 with two open ends are formed between the first radiating strips 13, and heat generated by charging and discharging of the battery cells can be outwards diffused through the y-direction radiating channels 131, so that internal heat accumulation after the battery cells are stacked up and down can be avoided, and the safety performance of the battery pack is improved;

As shown in fig. 4, when a plurality of battery cells are placed horizontally, the second heat dissipation strips 14 at corresponding positions are abutted against each other, a plurality of z-direction heat dissipation channels 141 can be formed between the second heat dissipation strips 14, and the z-direction heat dissipation channels 141 further avoid heat accumulation inside the battery cells after the battery cells are stacked up and down, so that the safety performance of the battery pack is improved.

Referring to fig. 5-7, a battery pack is composed of a lower case 2, an upper case (not shown), a bus bar (not shown), and a plurality of battery cells, wherein the battery cells are arranged in a space between the lower case 2 and the upper case, and the battery cells are connected in series through the bus bar; the cells in the battery pack are stacked as follows: in the z direction, how many electric cores are stacked one by one to form a stack a, in the x direction, a plurality of stacks a are arranged one by one to form a stack b, in the y direction, two stacks b are combined into a set c in an outward polar column mode, and when the battery pack is implemented, a plurality of sets c can be contained in the battery pack; it should be noted that, the connection mode between the battery core and the lower case 2 and the upper case is bonding, specifically, bonding fixation is realized through the heat conduction structural adhesive.

Through this technical scheme, through setting up spacing, first heat dissipation strip, second heat dissipation strip and bolt on the electric core, spacing and bolt grafting cooperation for stacking between the electric core need not to realize also can guaranteeing the stability of structure after stacking with the help of the roof beam structure, and simultaneously the existence of first heat dissipation strip, second heat dissipation strip makes the electric core stack the back, forms a plurality of heat dissipation channels between the electric core, can avoid the electric core to stack up from top to bottom and internal heat accumulation together from this, has not only improved battery package volumetric energy density, has still guaranteed the security performance of battery package.

Embodiment two: in order to reduce the material cost, unlike the first embodiment, the pins 18 have a columnar structure, four pins 18 are provided, two pins 18 cooperate with one slot 121, and after the upper and lower battery cells are stacked, two side walls of the pins 18 are simultaneously abutted against the inner walls of the slot 121.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. The utility model provides a battery cell, includes shell (11), battery cell body, positive pole post (15), explosion-proof valve (16), negative pole post (17), and in shell (11) was located to the battery cell body, positive pole post (15), explosion-proof valve (16), negative pole post (17) all located the right-hand member of shell (11), its characterized in that: the battery cell also comprises a heat dissipation component and a plug-in component; the heat dissipation component is coated on the periphery of the shell (11); the plug-in assembly comprises a limit bar (12) and a plug pin (18), wherein the limit bar (12) is arranged at the upper end of the shell (11), and the plug pin (18) is arranged at the lower end of the shell (11); the limiting strip (12) is provided with a slot (121) which is in plug-in fit with the plug pin (18).

2. The cell of claim 1, wherein: the bolt (18) is of a strip-shaped structure.

3. The cell of claim 1, wherein: the bolt (18) is of a columnar structure.

4. The cell of claim 1, wherein: the heat dissipation assembly comprises a plurality of first heat dissipation strips (13) and a plurality of second heat dissipation strips (14); the plurality of first radiating strips (13) are uniformly distributed on the upper end face and the lower end face of the shell (11); the second radiating strips (14) are uniformly distributed on the side surface of the shell (11); the height of the limit strip (12) is consistent with that of the first heat dissipation strip (13), and the height of the bolt (18) is larger than that of the first heat dissipation strip (13).

5. The cell of claim 4, wherein: the first heat dissipation strip (13) is paved along the length direction of the shell (11).

6. The cell of claim 4, wherein: the second heat sink strips (14) are laid longitudinally on the side of the housing (11).

7. The cell of claim 4, wherein: the height of the bolt (18) is twice the height of the first radiating strip (13).

8. A battery pack, characterized in that: the battery pack comprises a lower box body, an upper box body and a plurality of electric cores as claimed in any one of claims 1-7, wherein the lower box body and the upper box body are connected to form a fixed cavity, and the electric cores are stacked in the fixed cavity.

9. The battery pack of claim 8, wherein: the battery cell is bonded with the lower box body and the upper box body.

10. The battery pack of claim 8, wherein: the battery pack further includes a bus bar; the plurality of battery cells are connected in series through the bus bars.