CN214754042U

CN214754042U - Power battery pack

Info

Publication number: CN214754042U
Application number: CN202121453754.4U
Authority: CN
Inventors: 金小朝; 张航; 宋明; 李飞鸿; 廉静; 于旭东
Original assignee: SAIC Volkswagen Automotive Co Ltd
Current assignee: SAIC Volkswagen Automotive Co Ltd
Priority date: 2021-06-29
Filing date: 2021-06-29
Publication date: 2021-11-16
Anticipated expiration: 2031-06-29

Abstract

The utility model discloses a power battery package, include: several electric core groups, separator and casing. Each electric core group comprises a plurality of electric cores which are adjacently arranged and mutually fixed to form the electric core group. The spacers are disposed between the electric core groups to separate the adjacent electric core groups. The electric core groups separated by the separators are directly arranged in the shell, the electric cores are mutually connected through connecting wires, the shell is provided with an interface, and the connecting wires are led out from the interface. The utility model discloses a power battery package adopts the two-stage structure that electric core direct assembly becomes the battery package, has saved battery package inner space, has promoted space utilization. Under the same volume, the utility model discloses a power battery package has improved about 21% than the energy of traditional tertiary structure's battery package, and whole Package Energy Density (PED) has improved about 15%, and the battery core also improves 76% to the integrated efficiency of whole package.

Description

Power battery pack

Technical Field

The utility model relates to a new energy automobile technical field, more specifically say, relate to the power battery technique among the new energy automobile.

Background

With the continuous development of electric vehicles, the performance requirements for electric vehicles are also higher and higher. The power battery is a core component of the electric automobile, and the energy density of the power battery directly determines the cruising ability and various driving indexes of the electric automobile, and is one of the most concerned core indexes of the electric automobile. The energy density of the power battery is the stored energy in unit volume, and various ways for improving the energy density are available, such as changing material components, improving the energy density by using different materials, and improving the battery pack structure, for example, more battery cells are filled in the same volume to improve the energy density.

The difficulty of improving the energy density by changing the battery material is high, the characteristics of the battery after the material is changed are changed, strict stability and risk tests are required, the development period is long, and the power system of the whole vehicle is required to be correspondingly changed to match the battery performance.

In contrast, the structure of the battery pack is changed, more battery cores are arranged in the original space, the battery pack is easier to realize, the change only relates to the battery pack, peripheral parts do not need to be changed, and the battery pack is easy to apply.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a novel power battery package, the tertiary structure who assembles module, module and reassemble into the battery package with traditional electric core changes electric core direct assembly into the two-stage structure of battery package.

According to the utility model discloses an embodiment provides a power battery package, include:

the battery pack comprises a plurality of battery cores, each battery core pack comprises a plurality of battery cores, and the plurality of battery cores are adjacently arranged and mutually fixed to form the battery core pack;

the isolating pieces are arranged between the electric core groups to isolate the adjacent electric core groups;

the battery cell comprises a shell, wherein a plurality of battery cell groups separated by a partition piece are directly arranged in the shell, the battery cells are mutually connected through connecting wires, an interface is arranged on the shell, and the connecting wires are led out from the interface.

In one embodiment, the plurality of cells in each cell group are fixed to each other by means of rolling and gluing, and the aerogel is filled between the adjacent cells.

In one embodiment, the connection wiring comprises an electric wiring and a signal wiring, the electric wiring is a high-voltage copper bar, the electrodes of the cells in the cell group are connected through the high-voltage copper bar, the signal wiring comprises a flexible circuit board, a plurality of temperature sensors and a plurality of sampling nickel sheets, the flexible circuit board spans all the cells in the cell group, the sampling nickel sheets are in contact with the cells, and the temperature sensors and the sampling nickel sheets are connected through the flexible circuit board.

In one embodiment, the isolation piece is an inverted T-shaped isolation piece, the inverted T-shaped isolation piece is inserted between the electric core groups from the bottom of the electric core groups, the transverse plates of the inverted T-shaped isolation piece are tightly attached to the bottom surfaces of the electric core groups, the vertical plates of the inverted T-shaped isolation piece are inserted into the intervals between the adjacent electric core groups, and the height of the vertical plates of the inverted T-shaped isolation piece is not less than the height of the electric cores.

In one embodiment, the case has a buffer area and a reinforcing beam, the outer circumference of the case has a fixing piece extending outward, the fixing piece has a fixing hole and a fixing groove, and the position of the fixing hole and the fixing groove corresponds to the battery pack mounting position on the vehicle body.

In one embodiment, the battery pack is fixed to the housing by a thermally conductive adhesive.

In one embodiment, the power battery pack further comprises a battery management assembly located outside the housing and connected to the connection wiring by an interface, the battery management assembly comprising: the battery management controller is connected with the plurality of module controllers, the plurality of module controllers are connected with the connecting wiring through interfaces, and the plurality of module controllers respectively correspond to different battery cores.

In one embodiment, the battery management controller is arranged at the tail end of the shell, the module controllers are respectively arranged at two sides of the shell, and the interfaces are distributed at the two sides of the shell.

In one embodiment, each of the module controllers has a plurality of sampling jacks, the total number of the sampling jacks of the module controllers is equal to the total number of the cells in the casing, the cells correspond to the jacks one to one, the module controllers correspond to the cells with a short spatial distance, and the connection wiring led out from the cells is connected to the sampling jacks on the corresponding module controllers through the interfaces on the side edges of the casing so as to obtain the shortest wiring distance.

The utility model discloses a power battery package adopts the two-stage structure that electric core direct assembly becomes the battery package, has saved battery package inner space, has promoted space utilization. Under the same volume, the utility model discloses a power battery package has improved about 21% than the energy of traditional tertiary structure's battery package, and whole Package Energy Density (PED) has improved about 15%, and the battery core also improves 76% to the integrated efficiency of whole package.

Drawings

Fig. 1 discloses a structure diagram of a power battery pack according to an embodiment of the present invention.

Fig. 2 shows a structure diagram of the battery cell set and the separator in the power battery pack according to an embodiment of the present invention.

Fig. 3a and 3b show schematic diagrams of wiring lines of the electric core pack in the power battery pack according to an embodiment of the present invention.

Fig. 4 discloses a schematic diagram of the connection between the power battery pack and the battery management assembly according to an embodiment of the present invention.

Detailed Description

Fig. 1 discloses a structure diagram of a power battery pack according to an embodiment of the present invention. Referring to fig. 1, the power battery pack includes: several electric core groups 101, a separator 102 and a shell 103.

Each of the plurality of electric core groups 101 includes a plurality of electric cores, and the plurality of electric cores are adjacently arranged and fixed to each other to form the electric core group 101. In one embodiment, the cell is a square-shelled cell. The square-shell electric cores in each electric core group are mutually fixed by means of rolling and gluing, for example, the electric cores are connected by gluing and then are bound and fixed by steel rolling strips. In order to realize insulation and heat insulation between the battery cells, in one embodiment, aerogel is filled between the adjacent battery cells for insulation and heat insulation. In the illustrated embodiment, each of the cell packs 101 includes 18 square-shell cells, and one battery pack includes 6 cell packs, and 108 square-shell cells.

Spacers 102 are provided between the electric core groups 101 to separate the adjacent electric core groups 101. Fig. 2 shows a structure diagram of the battery cell set and the separator in the power battery pack according to an embodiment of the present invention. As shown, the spacer 102 is an inverted T-shaped spacer, which is inserted between the electric core groups from the bottom of the electric core group 101. The transverse plates of the inverted T-shaped isolating pieces 102 are tightly attached to the bottom surfaces of the electric core groups 101, and the vertical plates of the inverted T-shaped isolating pieces 102 are inserted into the intervals between the adjacent electric core groups 101. The height of the vertical plate of the inverted T-shaped separator is not less than the height of the cells, so that the separator 102 can completely separate the adjacent cell groups and the cells therein. In the illustrated embodiment, the height of the vertical plate of the inverted T-shaped separator is substantially equal to the height of the cell.

In the utility model discloses a power battery package, the several is with the electric core group 101 direct mount of separator 102 partition in casing 103. In one embodiment, the electrical core pack 101 is secured to the housing 103 by a thermally conductive adhesive. For example, the partition member 102 is first fixed to the housing 103, then the electric core assembly 101 is placed on the partition member 102, and then a heat conductive adhesive is injected between the bottom of the electric core assembly 101 and the housing 103, so that the electric core assembly 101, the partition member 102 and the housing 103 are fixed. The outer envelope shape of the housing 103 remains consistent with the outer envelope of the housing of existing battery packs. Referring to fig. 1, the case 103 has a buffer 131 and a reinforcing beam 132, the case 103 has a fixing piece 133 extending outward at an outer circumference thereof, the fixing piece 133 has a fixing hole 134 and a fixing groove 135 therein, and the positions of the fixing hole 133 and the fixing groove 135 correspond to the battery pack mounting position on the vehicle body. Thus, all structural modifications are limited to the inside of the case, the structure of the outside of the case and the peripheral components is not changed, and the battery pack can be directly used with an existing vehicle. The electric cores are connected with each other through a connecting wire, the shell is provided with an interface, and the connecting wire is led out from the interface.

In one embodiment, the connection wiring comprises an electric wiring and a signal wiring, the electric wiring is a high-voltage copper bar, the electrodes of the cells in the cell group are connected through the high-voltage copper bar, the signal wiring comprises a flexible circuit board, a plurality of temperature sensors and a plurality of sampling nickel sheets, the flexible circuit board spans all the cells in the cell group, the sampling nickel sheets are in contact with the cells, and the temperature sensors and the sampling nickel sheets are connected through the flexible circuit board. Fig. 3a and 3b show schematic diagrams of wiring lines of the electric core pack in the power battery pack according to an embodiment of the present invention. Referring to fig. 3a and 3b, in each electric core group, the wiring lines comprise: high-voltage copper bar 301, flexible line way board 302, sampling nickel piece 303, temperature sensor 304 and signal interface 305. The electrodes of each electric core in the electric core group are connected through a high-voltage copper bar 301. The flexible circuit board 302 spans all the electric cores in the electric core group, and the sampling nickel sheet 303 is contacted with the electric cores. The temperature sensor 304 and the sampling nickel sheet 303 are connected through a flexible circuit board 302. The sampling nickel sheet and the temperature sensor detect the temperature of the battery core, and detection signals are transmitted to the signal interface 305 through the flexible circuit board 302 and then transmitted to the outside through the signal interface 305. The wiring lines shown in fig. 3a and 3b are configured in a slightly different manner, but the basic components, namely the high-voltage copper bar 301, the flexible circuit board 302, the sampling nickel plate 303, the temperature sensor 304 and the signal interface 305 are the same, and the connection manner of the components is also basically the same, so that the arrangement positions and the number of the indication components are slightly different. In one embodiment, for 18 cells of one cell group, 2 flexible circuit boards, 4 temperature sensors and 20 sampling nickel sheets are configured, and a signal interface 305 is respectively arranged at two ends of the cell group. Fig. 3a and 3b show wiring lines in the cell packs, for the battery pack, the high-voltage copper bars and the signal interfaces of each cell pack respectively lead out copper bars and wiring, and the copper bars and the wiring are converged to form connecting wiring which is led out of the shell through the interface on the shell and connected with the battery management assembly.

In one embodiment, the power battery pack of the present invention further comprises a battery management assembly. Fig. 4 discloses a schematic diagram of the connection between the power battery pack and the battery management assembly according to an embodiment of the present invention. Referring to fig. 4, in the illustrated embodiment, the battery management assembly is located outside the housing and is connected to the connection wiring by an interface, the battery management assembly including: the battery management system comprises a battery management controller (BMCe)141 and a plurality of module controllers (CMCe)142, wherein the battery management controller 141 is connected with the module controllers 142, the module controllers 142 are connected with connecting wires through interfaces, and the module controllers 142 respectively correspond to different battery cores. In the illustrated embodiment, a battery management controller (BMCe)141 is disposed at the rear end of the housing 103, and a plurality of module controllers (CMCe)142 are respectively disposed at two sides of the housing 103, and accordingly, a plurality of the interfaces are distributed at two sides of the housing 103. The plurality of module controllers 142 each have a plurality of sampling jacks, the total number of the sampling jacks of the plurality of module controllers is equal to the total number of the cells in the casing, and the cells correspond to the jacks one to one. The module controller corresponds to the battery cell with a short space distance, and the connection wiring led out by the battery cell is connected to the sampling socket on the corresponding module controller through the interface on the side edge of the shell so as to obtain the shortest wiring distance. In the illustrated embodiment, the battery pack has 108 cells in total, and is given the numbers #1 to # 108. The module controller (CMCe)142 includes two models: CMCP12 and CMCP 48. CMCP12 has one sampling end with 12 sampling patch ports. CMCP48 has four sampling ports, each with 12 sampling patch ports, so a total of 48 sampling patch ports are available for one CMCP 48. In the illustrated embodiment, two module controllers (CMCe)142 are disposed on the upper side of the housing 103, one of which is CMCP12 and the other of which is CMCP 48. According to the principle of spatial proximity between the cells and the module controller, the CMCP12 samples the cells numbered #1- #12, and further, in the illustrated embodiment, the cells #1- #12 are divided into two parts: #1- #9 and #10- #12 are connected to the CMCP12 via closer interfaces through respective connection lines. The CMCP48 samples cells numbered #13- #60, and further, in the illustrated embodiment, the cells numbered #13- #60 are divided into seven parts: #13- #18, #19- #24, #25- #27, #28- #36, #37- #45, #46- #48 and #49- #60, respectively, are connected to the CMCP48 via the closer interface by respective connection lines. A module controller (CMCe)142, CMCP48, is disposed at the lower side of the housing 103, and the CMCP48 at the lower side samples cells numbered #61- #108 according to the spatial proximity principle of the cells and the module controller, and further, in the illustrated embodiment, the cells #61- #108 are divided into eight parts: #61- #63, #64- #72, #73- #81, #82- #84, #85- #90, #91- #96, #97- #99 and #100- #108, respectively, are connected to the CMCP48 via the closer interface by respective connection lines. The utility model discloses well module controller (CMCe)'s sampling socket's utilization ratio reaches 100%. And the space based on electric core and module controller is close to the principle and is corresponded for the length of connecting the pencil is the shortest, effectively optimizes the influence of line resistance to sampling precision.

The utility model discloses a power battery package has got rid of the structure of module, effectively reduces the quantity of the inside spare part of battery package, reduces whole package quality by a wide margin, simplifies assembly process and flow. Simultaneously, the reduction of spare part has improved battery package space utilization, and the space in the outer envelope of electric core arrangement make full use of battery package compares in the traditional battery package design that has the module, can arrange more electric cores in the same space.

It should also be noted that the above-mentioned embodiments are only specific embodiments of the present invention. It is obvious that the present invention is not limited to the above embodiments, and similar changes or modifications can be directly derived or easily suggested by those skilled in the art from the disclosure of the present invention, and all should fall within the protection scope of the present invention. The above-described embodiments are provided to enable persons skilled in the art to make or use the invention, and many modifications and variations may be made to the above-described embodiments by persons skilled in the art without departing from the inventive concept of the present invention, so that the scope of the invention is not limited by the above-described embodiments, but should be accorded the widest scope consistent with the innovative features set forth in the claims.

Claims

1. A power battery pack, comprising:

2. The power battery pack of claim 1, wherein the plurality of cells in each cell pack are fixed to each other by taping and gluing, and the aerogel is filled between the adjacent cells.

3. The power battery pack of claim 1, wherein the connection wires comprise electrical wires and signal wires, the electrical wires are high-voltage copper bars, electrodes of the cells in the cell pack are connected through the high-voltage copper bars, the signal wires comprise a flexible circuit board, a plurality of temperature sensors and a plurality of sampling nickel plates, the flexible circuit board spans all the cells in the cell pack, the sampling nickel plates are in contact with the cells, and the temperature sensors and the sampling nickel plates are connected through the flexible circuit board.

4. The power battery pack of claim 1, wherein the separator is an inverted T-shaped separator, the inverted T-shaped separator is inserted between the electric core groups from the bottom of the electric core groups, the transverse plates of the inverted T-shaped separator are tightly attached to the bottom surfaces of the electric core groups, the vertical plates of the inverted T-shaped separator are inserted into the spaces between the adjacent electric core groups, and the height of the vertical plates of the inverted T-shaped separator is not less than the height of the electric cores.

5. The power battery pack according to claim 1, wherein the case has a buffer area and a reinforcing beam, the case has fixing pieces extending outward at the outer circumference thereof, the fixing pieces have fixing holes and fixing grooves, and the positions of the fixing holes and the fixing grooves correspond to the battery pack mounting positions on the vehicle body.

6. The power battery pack of claim 1, wherein the battery pack is secured to the housing by a thermally conductive adhesive.

7. The power battery pack of claim 1, further comprising a battery management assembly located outside the housing and connected to the connection wiring via the interface, the battery management assembly comprising: the battery management controller is connected with the plurality of module controllers, the plurality of module controllers are connected with the connecting wiring through interfaces, and the plurality of module controllers respectively correspond to different battery cores.

8. The power battery pack according to claim 7, wherein the battery management controller is disposed at the rear end of the housing, the plurality of module controllers are disposed at two sides of the housing, and the plurality of interfaces are distributed at two sides of the housing.

9. The power battery pack of claim 8, wherein each of the module controllers has a plurality of sampling jacks, the total number of the sampling jacks of the plurality of module controllers is equal to the total number of the cells in the housing, the cells correspond to the jacks one by one, the module controllers correspond to the cells with a short spatial distance, and the connection wires led out from the cells are connected to the sampling jacks on the corresponding module controllers through the interfaces on the side edges of the housing to obtain the shortest connection distance.