CN214123997U

CN214123997U - Compatible same-voltage different-capacitance lithium battery PACK structure

Info

Publication number: CN214123997U
Application number: CN202120063507.7U
Authority: CN
Inventors: 王金胜
Original assignee: Shaanxi Changfeng Power Co ltd
Current assignee: Shaanxi Changfeng Power Co ltd
Priority date: 2021-01-12
Filing date: 2021-01-12
Publication date: 2021-09-03
Anticipated expiration: 2031-01-12

Abstract

The utility model relates to a compatible same voltage different capacitance lithium cell PACK structure, including a shell, the shell includes upper cover, lower box that mutually support, the lower box has a die cavity in, the cross-section of this die cavity is isosceles trapezoid shape, and the length of the upper base of die cavity is longer than the length of the lower base of die cavity, still all installs the buffering bubble cotton on the inner wall of lower box, the one side that the inner wall of lower box was kept away from to buffering bubble cotton is a vertical plane, and the one side that buffering bubble cotton and the inner wall of lower box laminated mutually is an inclined plane; and the battery cell unit is arranged in the shell. The utility model has the advantages that: the cotton complex design of die cavity and buffering bubble that adopts the isosceles trapezoid shape utilizes the buffering bubble cotton to realize the uniformity of box internal dimension down, and based on such design, the accessible increases to draw the increase of the degree of depth that the inclination realized the inner chamber of box down to the integration shaping of box down is realized to the realization can be applicable to the installation of the lithium cell of the different electric capacity of multiple same voltage.

Description

Compatible same-voltage different-capacitance lithium battery PACK structure

Technical Field

The utility model relates to a lithium cell field, in particular to compatible with different electric capacity lithium cell PACK structure of voltage.

Background

The battery is a vehicle-mounted energy source for providing energy for the electric vehicle, and the lithium battery electric vehicle uses the latest lithium ion battery. And (4) using a prompt: the controller main control board is an electric vehicle main loop, has larger working current and can emit larger heat. Therefore, the electric vehicle does not need to be parked under the sun for insolation and does not need to be drenched for a long time, so that the controller is prevented from being out of order.

The lithium battery is not applied to the electric bicycle for a long time, and the technology of the lithium battery does not reach a high level, so that various technical problems still exist, and the development of the electric bicycle lithium battery industry is restricted to a certain extent.

Lithium battery electric bicycles have the advantages of long life, light weight and small volume. There is a small-size lithium battery electric bicycle, the weight is about 16 kilograms, and the battery is 5 kilograms heavy, can put in the package and carry away, can also be used for charging the computer, and the lead-acid battery weight that its horsepower is equivalent is about 15 kilograms.

The lithium battery electric bicycle has the biggest advantage of long service life, a group of batteries can be used for 4-5 years, and the service life of a lead-acid battery is only about 2 years. The lithium battery is easy to activate, and the battery can be activated only by 3-5 times of normal charge-discharge cycles to recover the normal capacity. The lithium battery has almost no memory effect due to the characteristics of the lithium battery. Therefore, the user does not need special methods and equipment in the activation process of the new lithium battery.

The lithium battery electric bicycle has the defects of high price and market share of only 4 percent. At present, the price of the lithium battery electric bicycle is generally higher than that of a lead-acid battery electric bicycle by hundreds of yuan to one thousand yuan, so the sales volume is not large. At present, the light electric vehicle uses lithium batteries which generally have too many structural design defects, the working condition environment of the light electric vehicle (especially a shared electric vehicle) is not fully considered, the light electric vehicle has higher voltage due to large capacity, more batteries need to be connected in parallel, and the requirements on shock resistance and protection are higher, but the existing battery pack design on the market adopts a certain number of battery cores to be directly connected in parallel, the structural design is simple bracket connection or direct bracket connection is not used, the shell design adopts plastics but the heat dissipation performance of the shell is not fully considered, the interior of the battery is a simple basic protection function, and the problems of the whole string of battery cores burning and igniting caused by impact, shock and single battery core abnormity in the practical application of the light electric vehicle are lack of consideration and counter measures; and the battery is changed and is taken and all need the professional to come the operation, and PCBA control unit is for decomposing structural design, leads to the higher scheduling problem defect of cost and risk.

The advantages and disadvantages of the lithium battery for the electric bicycle and the internal structure composition are as above. When purchasing the lithium battery, whether a safety protection circuit board is additionally arranged or not needs to be seen. Without the protection circuit board, the lithium battery has the danger of deformation, liquid leakage and explosion. At present, lithium batteries are in the stages of continuously improved performance, continuously reduced cost, rapidly expanded application fields and sharply increased market share, and gradually replace nickel-hydrogen batteries, cadmium-nickel batteries and other batteries.

At present, the problem that needs to be solved by the lithium ion battery for the electric bicycle is mainly the safety problem in the use process, and how to solve the safety problem becomes a trend of the development of the lithium ion battery for the electric bicycle in the future.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a compatible with different electric capacity lithium cell PACK structure of voltage, can solve the two wheeler lithium cell PACK structure among the prior art incompatible, the electric core type incompatible, the condition such as battery model incompatible to and the resonance that arouses the battery package easily in the vibration of driving in-process automobile body produces the influence scheduling problem to the battery performance, solve the incompatible and electrical property fault condition of battery fundamentally.

In order to solve the technical problem, the utility model adopts the technical scheme that: the utility model provides a compatible same voltage different capacitance lithium cell PACK structure, its innovation point lies in: comprises that

The shell comprises an upper cover and a lower box body which are matched with each other, a cavity is formed in the lower box body, the section of the cavity is in an isosceles trapezoid shape, the length of the upper bottom of the cavity is longer than that of the lower bottom of the cavity, buffering foam is arranged on the inner wall of the lower box body, one surface, away from the inner wall of the lower box body, of the buffering foam is a vertical plane, one surface, attached to the inner wall of the lower box body, of the buffering foam is an inclined surface, and the inclined direction of the inclined surface is gradually inclined towards the inner wall of the lower box body from bottom to top;

the battery cell unit is arranged in the shell, the battery cell unit is provided with a plurality of parts which are distributed in the shell side by side, the battery cell unit comprises a pair of battery cell supports which are arranged in a cavity of the lower box body, a gap for installing the battery cell is reserved between the two battery cell supports, and a nickel strap for connecting the battery cell is also arranged on the battery cell supports.

Furthermore, the electric core support is a rectangular support, positioning grooves for accommodating one-to-one installation of the electric cores are formed in the end face of one side, adjacent to each other, of two electric core supports in the same electric core unit, positioning column groups are further arranged on one side of the long axis direction of the electric core support and are formed by positioning columns extending along the width direction of the electric core support, one sides of the positioning columns are fixed with the electric core support, the other sides horizontally extend out of the outer side of the electric core support, wiring slot groups are further arranged on the two sides of the width direction of the electric core support, each wiring slot group is formed by wiring slots distributed along the long axis direction of the electric core support, and each wiring slot is sunken towards the inside of the electric core support.

Further, the upper side and the lower side of the battery cell support are both provided with protective cotton, the PC sheets with insulation protection are attached to the front side and the rear side of the battery cell support, and a protective plate is additionally arranged on the outer side of the PC plate.

Furthermore, the nickel strap comprises a long strip-shaped nickel sheet and chip groups arranged at the side end of the nickel sheet, each chip group consists of a plurality of chips which are distributed in parallel along the long axis direction of the nickel sheet and correspond to the battery cell one by one, through holes which are contacted with the battery cell and are used for accommodating the chips are further formed in the battery cell support, the nickel sheet is attached to the bottom end face of the battery cell support, meanwhile, sunken nickel sheet positioning grooves are further formed in the bottom end face of the battery cell support, positioning flanges which are attached to the side end face of the battery cell support are further arranged on one side of the long axis direction of the nickel sheet, a flange structure which extends towards the through holes of the battery cell support is arranged at each chip on the nickel sheet, and one side of the chip is connected with the flange structure, so that the chip, the flange structure and the nickel sheet form a Z-shaped structure.

Furthermore, the upper cover is also provided with a handle which is integrally formed with the upper cover.

Furthermore, the upper cover is provided with two socket jacks, wherein one socket jack is a rectangular jack, and the other socket jack is a circular jack.

Further, it is fixed through screwed connection between lower box and the upper cover, has a round and beats the gluey nest on the top of box down, beats and to glue the intussuseption of nest and be filled with sealed glue, covers on simultaneously and still is provided with and ends and meets the mouth with beating the corresponding position of gluey nest.

The utility model has the advantages that: the utility model discloses in, through improving the lower box, the die cavity that adopts the isosceles trapezoid shape and the cotton complex design of buffering bubble, utilize the cotton unity that realizes the internal dimension of lower box of buffering bubble, based on such design, the accessible increases and touches the increase of the degree of depth of the inner chamber that the inclination realized the lower box, thereby realize the integrated shaping of lower box, need not to assemble lower box split into two parts, can be applicable to the installation of multiple lithium cell with the different electric capacity of voltage, can compatible multiple capacities such as 48V12Ah/16Ah/20Ah, can install the ternary simultaneously, the 18650/26700/21700 electric core of lithium iron, have the unity.

For the design of the battery cell support, the positioning grooves are designed on the end surface of the battery cell support, so that the battery cells are conveniently positioned and installed one by one, and the accuracy of the positions of the battery cells is ensured; the wiring groove group on the battery cell support is designed to facilitate wiring of the wiring harness, and the wiring harness is arranged in a manner of being the same as the best, so that the wiring harness is prevented from being distributed in a lower box body in a messy manner to influence subsequent maintenance; in addition, the design of the positioning column group on the battery cell support is used for positioning the position of the battery cell support, so that the phenomenon of dislocation of the battery cell support in the lower box body is avoided.

To protection cotton, PC piece, the protection shield on the electric core support, then be in order to carry out independent protection to the electric core support, make it insulating, avoid appearing the phenomenon of current interference between the adjacent electric core support.

The design of nickel strap is through setting up formula nickel piece constant head tank that sinks on the bottom face at electric core support to fix a position the relative position of nickel piece and electric core support, make things convenient for the quick installation of nickel strap, also avoid simultaneously at the in-process that uses, the phenomenon of mutual dislocation appears between nickel strap and the electric core support, and influence the smooth use of electric core, and the turn-ups's of location design on the nickel piece, then it is further to carry on spacingly to the relative position between nickel strap and the electric core support.

To being connected between lower box and the upper cover, beat through the top design of box down and glue the nest and fill sealed glue, cover simultaneously and design out and end meeting the mouth, pass through the screw fixation at last to make box and upper cover down form a inclosed whole, guarantee holistic waterproof performance.

In the lithium battery PACK structure of the utility model, all the used materials of the whole battery PACK are V0-grade flame retardant materials, thereby improving the overall flame retardant property; the protection foam and the protection cotton on the battery cell bracket are matched together, so that the all-around protection of six surfaces of the battery cell is realized, and the damping effect is better; the design of constant head tank can make electric core evenly arrange on electric core support, conveniently through the air heat dissipation, ensures holistic heat conduction thermal diffusivity behind the rubber coating.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Fig. 1 is a front view of the upper cover and the lower box of the present invention.

Fig. 2 is a front view of the middle battery module of the present invention.

Fig. 3 is a top view of the upper cover of the present invention.

Fig. 4 is a schematic view of the middle and lower box bodies of the present invention.

Fig. 5 is the structure diagram of the cell holder of the present invention.

Fig. 6 is a first structural schematic diagram of the middle nickel strap of the present invention.

Fig. 7 is a schematic diagram of a second middle structure of the middle nickel strap of the present invention.

Fig. 8 is a schematic diagram of the PC of the present invention.

Detailed Description

The following examples are presented to enable those skilled in the art to more fully understand the present invention and are not intended to limit the scope of the present invention.

A PACK structure compatible with lithium batteries with same voltage and different capacitance as shown in FIGS. 1-8 comprises

An outer shell, the shell is including the upper cover 1 that mutually supports, lower box 2, a die cavity has in lower box 2, the cross-section of this die cavity is isosceles trapezoid shape, and the length of the lower bottom of die cavity is longer than the length of the lower bottom of die cavity, still all install the cotton 3 of buffering bubble on lower box 2's inner wall, the cotton 3 one side of the inner wall of box 1 is a vertical plane under keeping away from of buffering bubble, the cotton 3 one side of laminating mutually with lower box 1's inner wall of buffering bubble is an inclined plane, and the incline direction on this inclined plane is for the inner wall direction slope of box 1 down gradually from bottom to top.

The lower box body 2 and the upper cover 1 are fixedly connected through screws, as shown in fig. 3, through holes 14 for allowing the screws to pass through are formed in the upper cover 1, as shown in fig. 4, threaded blind holes 23 matched with the screws in a threaded manner are further formed in the lower box body 2, a circle of gluing nest 21 is arranged at the top end of the lower box body 2, sealant is filled in the gluing nest 21, and meanwhile, a seam stopping opening is further formed in the upper cover 1 at a position corresponding to the gluing nest 21. To being connected between lower box 2 and the upper cover 1, beat through the top design of box 2 down and glue nest 21 and fill sealed glue, design simultaneously on upper cover 1 and end meeting the mouth, fix through the screw at last to make box 2 and upper cover 1 down form a inclosed whole, guarantee holistic waterproof performance.

A transverse limiting column is arranged in the upper cover 1 to limit up-and-down movement, and a longitudinal limiting groove is arranged in the lower box body 2 to limit left-and-right movement.

The battery pack is characterized in that a top PC board 9 is further mounted at the position of the joint of the upper cover 1 and the lower box 2 in the lower box 2, a top protection board 8 is further arranged at the bottom end of the top PC board 9, a connector matched with the battery cell unit is formed in the top protection board 8, and a BMS control system of the whole battery pack is further integrated on the top protection board 8.

The upper cover 1 is also provided with a handle 11 integrally formed with the upper cover 1.

The upper cover 1 has two socket insertion holes, one of which is a rectangular insertion hole 12, and the other of which is a circular insertion hole 13.

The up end of box 2 still is provided with the spacing strengthening rib 22 that a plurality of levels set up under, and one side of spacing strengthening rib 22 is fixed on the inner wall of box 2 down, and the central axis direction of the downward box 2 of opposite side level of spacing strengthening rib 22 extends, through spacing strengthening rib 22's design to carry out spacing support to upper cover 1, guarantee the stability of the relative position between upper cover 1 and the lower box 2.

Set up the electric core unit in the shell, electric core unit has threely, from top to bottom side by side distribute in the shell, electric core unit includes a pair of installation electric core support in the die cavity of box 2 down, leave the clearance of holding the installation of electric core 6 between two electric core supports 5, still install the nickel strap 7 with electric core 6 connection on electric core support 5, cooperate jointly through nickel strap 7 and pencil to come to connect all electric cores 6 in same electric core unit and form a battery module, the battery module passes through power pencil and socket jack connection.

As can be seen from the schematic diagram shown in fig. 5, the cell supports 5 are rectangular supports, and positioning grooves 51 are respectively formed on end surfaces of two adjacent sides of the cell supports 5 in the same cell unit, where the cell supports 6 are installed in one-to-one correspondence. The positioning grooves 51 are designed on the end face of the battery cell support 5, so that the battery cells 6 can be conveniently positioned one by one, and the accuracy of the positions of the battery cells 5 is ensured.

Still be provided with the reference column group in one of them side of the major axis direction of electric core support 5, the reference column group comprises several jointly along the reference column 54 that the width direction of electric core support 5 extends, and reference column 54 is vertical to be connected on the side end face of electric core support 5, and one side of reference column 54 is fixed with electric core support 5, and the opposite side level of reference column 54 stretches out the outside of electric core support 5. The design of the positioning column group on the battery cell support positions the position of the battery cell support 5 through the cooperation of the plurality of positioning columns 54, and the phenomenon of dislocation of the battery cell support 5 in the lower box body 2 is avoided.

The two sides of the width direction of the battery cell support 5 are also provided with routing slot groups, each routing slot group is composed of a plurality of routing slots 53 distributed along the long axis direction of the battery cell support 5, and the routing slots 53 are rectangular and are sunken into the battery cell support 5. For the design of the wire groove group on the electric core support, the wiring of the wire harness is facilitated, the wire harness is arranged in a way of being as complete as possible, and the wire harness is prevented from being distributed in the lower box body 2 in a mixed and disorderly manner to influence subsequent maintenance.

The upper side and the lower side of the battery cell support 5 are both provided with protective cotton 55, the front side and the rear side of the battery cell support 5 are both provided with PC sheets with insulation protection, and the outer side of the PC sheet is also provided with a protective plate. For the protection cotton 55, the PC sheet and the protection plate on the electric core support 5, the electric core support is independently protected and insulated, so that the phenomenon of current interference between adjacent electric core supports is avoided.

Two adjacent battery cell units are locked and fixed through bolts, and through holes for allowing the bolts to pass through are formed in the battery cell bracket 5.

As can be seen from the schematic diagrams shown in fig. 6 and 7, the nickel strap 7 includes a strip-shaped nickel sheet 71 and chip sets mounted at the side ends of the nickel sheet 71, in this embodiment, the nickel strap 7 has two different structural forms, the first is when there is only one chip set, the chip set is mounted at one side of the nickel sheet 71 in the width direction, as shown in fig. 7, and the second is when there are two chip sets, the two chip sets are respectively mounted at two sides of the nickel sheet 71 in the width direction, as shown in fig. 6. The design of nickel strap, through set up formula nickel piece constant head tank that sinks on electric core support 5's bottom face, thereby fix a position nickel piece 71 and electric core support 5's relative position, make things convenient for the quick installation of nickel strap 7, also avoid simultaneously at the in-process that uses, the phenomenon of mutual dislocation appears between nickel strap 7 and the electric core support 5, and influence electric core 6's smooth use, and the turn-ups's of location design on the nickel piece 71, it is further that the relative position between nickel strap 7 and the electric core support 5 carries on spacingly.

Each group of chip sets consists of a plurality of chips 72 which are distributed in parallel along the long axis direction of the nickel sheet 71 and correspond to the battery cores 6 one by one, the battery core support 5 is also provided with a through hole 52 for allowing each chip 72 to extend into contact with the battery core 6, the through hole 52 is positioned in the positioning groove 51, the nickel sheet 71 is attached to the bottom end surface of the battery core support 5, meanwhile, the bottom end surface of the battery cell bracket 5 is also provided with a sinking type nickel sheet positioning groove, the nickel sheet 71 is welded and fixed with the battery cell bracket 5 after being embedded into the nickel sheet positioning groove, one side of the nickel sheet 71 in the long axis direction is also provided with a positioning flange attached to the side end face of the battery cell bracket 5, the nickel sheet 71 at each chip 72 is provided with a flanging structure extending to the through hole of the cell support 5, and one side of the chip 72 is connected with the flanging structure, so that the chip 72, the flanging structure and the nickel sheet 71 form a Z-shaped structure.

The utility model discloses a lithium cell PACK structure, through improving the lower box, the die cavity that adopts the isosceles trapezoid shape and the cotton complex design of buffering bubble, utilize the cotton unity that realizes the internal dimension of lower box of buffering bubble, based on such design, the accessible increases and touches the increase of the degree of depth that the inclination realized the inner chamber of lower box, thereby realize the integrated shaping of lower box, need not to assemble lower box split into two parts, can be applicable to the installation of multiple lithium cell with the different electric capacity of voltage, can compatible multiple capacities such as 48V12Ah Ah 20Ah, can install the ternary simultaneously, the 18650/26700/21700 electric core of lithium iron, have the unity.

The utility model provides a lithium cell price is higher, battery and incompatible, and the space utilization is not enough, and the electricity core type does not match, and the leading principle of emergence is: the light electric vehicle (especially a sharing electric vehicle) has various models, batteries are diverse, and working conditions and environments are not fully considered, the light electric vehicle has high capacity and high voltage, the number of batteries needing to be connected in parallel is large, and requirements on shock resistance and protection are high, but the existing battery pack on the market is designed to be directly connected in parallel by a certain number of battery cores, and the structure is designed to be simple bracket connection or not using a bracket to be directly connected with a shell and is designed to be made of plastic, but the heat dissipation performance of the battery is not fully considered, the interior of the battery is a simple basic protection function, and the problems that the whole string of battery cores are burnt and ignited due to impact, shock and single battery core abnormity in the practical application of the light electric vehicle are lack of consideration and countermeasures; and the replacement and taking of the batteries are all operated by professional personnel, the PCBA control unit is designed in a decomposition structure, so that the problems of high cost, high risk and the like are caused, various vehicle types can only be matched with specific batteries, various capacities such as 48V12Ah/16Ah/20Ah and the like can be compatible, a 18650/26700/21700 battery cell of ternary lithium iron can be installed, and the uniformity is realized.

The battery is in the use, because service environment is not static use, need use under various operating modes, there is a large amount of vibration operating modes, consequently, inside coupling part is ageing to drop, lead to the contact to open circuit, connect not hard up and so on, finally can produce harmful effects to battery life, adopt this patent, play the structure solidification effect to fastener and coupling part, effectively avoid the problem that battery life is short under the vibration operating mode, stop the vibration and lead to open circuit and not hard up the problem, consequently, extension battery package life.

It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a compatible with different capacitance lithium cell PACK structure of voltage which characterized in that: comprises that

2. The PACK structure of a compatible lithium battery with a same voltage and a different capacitance as defined in claim 1, wherein: the battery cell support is a rectangular support, positioning grooves for accommodating battery cells in one-to-one correspondence are formed in the end faces of one side, adjacent to each other, of two battery cell supports in the same battery cell unit, positioning column groups are further arranged on one side of the long axis direction of the battery cell support and are formed by positioning columns extending along the width direction of the battery cell support, one sides of the positioning columns are fixed to the battery cell support, the other sides of the positioning columns horizontally extend out of the outside of the battery cell support, wiring groove groups are further arranged on the two sides of the width direction of the battery cell support, each wiring groove group is formed by wiring grooves distributed along the long axis direction of the battery cell support, and each wiring groove is recessed towards the inside of the battery cell support.

3. The PACK structure of a compatible lithium battery with a same voltage and a different capacitance as defined in claim 1, wherein: the upper and lower both sides of electricity core support all are provided with the protection cotton, all paste the PC piece that is equipped with insulation protection around electricity core support, still add in the outside of PC board and be equipped with the protection shield.

4. The PACK structure of a compatible lithium battery with a same voltage and a different capacitance as defined in claim 1, wherein: the nickel strap comprises a long-strip-shaped nickel sheet and chip groups arranged at the side end of the nickel sheet, each chip group consists of a plurality of chips which are distributed in parallel along the long axis direction of the nickel sheet and chips which are in one-to-one correspondence with the electric core, through holes which are contacted with the electric core are formed in the electric core support, the nickel sheet is attached to the bottom end face of the electric core support, meanwhile, sunken nickel sheet positioning grooves are formed in the bottom end face of the electric core support, positioning flanges which are attached to the side end face of the electric core support are further formed in one side of the long axis direction of the nickel sheet, and the position of each chip on the nickel sheet is provided with a flange structure which extends towards the through holes of the electric core support, one side of the chip is connected with the flange structure, so that the chip, the flange structure and the nickel sheet form a Z-shaped structure.

5. The PACK structure of a compatible lithium battery with a same voltage and a different capacitance as defined in claim 1, wherein: the upper cover is also provided with a handle which is integrally formed with the upper cover.

6. The PACK structure of a compatible lithium battery with a same voltage and a different capacitance as defined in claim 1, wherein: the upper cover is provided with two socket jacks, wherein one socket jack is a rectangular jack, and the other socket jack is a circular jack.

7. The PACK structure of a compatible lithium battery with a same voltage and a different capacitance as defined in claim 1, wherein: the lower box body is fixedly connected with the upper cover through screws, a circle of glue beating nest is arranged at the top end of the lower box body, sealant is filled in the glue beating nest, and a seam stopping opening is further formed in the position, corresponding to the glue beating nest, of the upper cover.