CN214505699U

CN214505699U - Low-voltage battery system

Info

Publication number: CN214505699U
Application number: CN202120508870.5U
Authority: CN
Inventors: 颜旭; 卞祥福
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2021-03-10
Filing date: 2021-03-10
Publication date: 2021-10-26
Anticipated expiration: 2031-03-10

Abstract

The utility model discloses a low voltage battery system belongs to power battery technical field. The low-voltage battery system comprises a plurality of battery cells, a CCS integrated board, a box body and a glue filling structure, wherein the CCS integrated board is fixedly arranged with the battery cells, the box body is provided with a limiting component and a connecting part, the battery cells are fixedly arranged in the box body through the limiting component, the CCS integrated board is fixedly arranged with the connecting part, and the glue filling structure is filled between the box body and the battery cells. In the low-voltage battery system of the utility model, a plurality of battery cores are directly arranged in the box body, so that the structure of the battery system is simplified, the manufacturing cost is reduced, and the energy density is improved; the box body is provided with the limiting assembly and the connecting part, so that the fixed installation of the battery cell and the CCS integrated board is realized respectively, and the battery cell is fixedly connected with the CCS integrated board, so that the structural installation stability is improved; the glue filling structure is filled between the battery core and the box body, so that the battery core is fixed with the box body, the rigidity of the whole battery system is increased, and the shock resistance is enhanced.

Description

Low-voltage battery system

Technical Field

The utility model relates to a power battery technical field especially relates to a low voltage battery system.

Background

With the technical development of new energy batteries in recent years, the new energy batteries have been popularized from automobile power batteries to the fields of rail transit, marine transportation, industrial docks, warehousing and transportation, household power supplies and the like. The conventional low-voltage battery system generally forms the battery cores into a module by a grouping technology and then fixes the battery cores in the box body by the long screw rods, and the connection mode has the advantages that the connection strength is improved, the shock resistance is ideal, the assembly automation degree of the whole system is high, and the battery system is a conventional design mode of the battery system; however, the weight of the low-voltage battery system in the prior art is large, parts such as the end plates and the side plates are required to be matched in groups in the process of forming the battery cell into a module, the manufacturing cost of the whole system is greatly improved, part structures such as the end plates and the side plates occupy large space, the space utilization rate is low, and the energy density of the battery system is reduced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a low voltage battery system simplifies the structure, and reduce cost improves energy density, improves shock resistance.

To achieve the purpose, the utility model adopts the following technical proposal:

a low-voltage battery system comprising:

a plurality of cells;

the CCS integrated board is fixedly arranged with the battery cell;

the battery cell is fixedly arranged in the box body through the limiting assembly, and the CCS integrated board is fixedly arranged with the connecting part;

and the glue filling structure is filled between the box body and the battery cell.

Optionally, each of the electric cores forms an electric core group, and each of the electric cores is fixed to each other by a fixing member, where the fixing member includes:

the spacing pieces are arranged between every two adjacent electric cores at intervals;

and the coating structure is coated outside the electric core group.

Optionally, the limiting assembly comprises:

the limiting piece is fixed on the box body and is abutted against the battery cell; and/or

The structure glue, coat in the bottom of the case of box, the box with electric core passes through the structure glues the bonding.

Optionally, the CCS integrated board includes a CCS bracket, and a buss bar and an FFC integrated on the CCS bracket, where the buss bar is welded to the battery cell, and the CCS bracket is connected to the connecting portion.

Optionally, a glue injection hole is formed in the CCS support, and the glue injection structure is filled between the box body and the battery cell through the glue injection hole.

Optionally, the box includes:

the battery cell and the CCS integrated board are arranged in the lower box body;

and the upper cover plate is connected to the lower box body in a sealing manner.

Optionally, the low voltage battery system further includes a BMS detachably connected to the upper cover plate, and a communication plug connected to the BMS, the communication plug penetrating the upper cover plate and being capable of being connected to the outside, the FFC being welded to the BMS.

Optionally, a conductive block is detachably connected to the lower case, the busbar includes an output electrode, and the conductive block is used for connecting the BMS and the output electrode.

Optionally, the CCS integrated board further includes an insulating cover plate clamped to the CCS support, the insulating cover plate is disposed between the buss bar and the upper cover plate, and the insulating cover plate is used for insulating protection of the buss bar.

Optionally, the upper cover plate is connected with a sealing cover in a sealing manner; and/or

The upper cover plate is connected with a pressure release valve in a sealing way; and/or

The upper cover plate is connected with a pole protective cover, and the pole protective cover is used for insulating and protecting a pole.

The utility model has the advantages that:

according to the low-voltage battery system provided by the utility model, the plurality of battery cells are directly arranged in the box body, so that the structure of the battery system is simplified, the manufacturing cost is reduced, the space ratio of the battery system is improved, and the energy density is further improved; the box body is provided with the limiting assembly and the connecting part, so that the fixed installation of the battery cell and the CCS integrated board is realized respectively, and the battery cell is fixedly connected with the CCS integrated board, so that the structural installation stability is improved, and the stability of the service performance is further improved; the glue filling structure is filled between the battery core and the box body, so that the battery core is fixed with the box body, the rigidity of the whole battery system is increased, and the shock resistance is enhanced.

Drawings

Fig. 1 is an exploded view of a low voltage battery system according to an embodiment of the present invention;

fig. 2 is a schematic view of an installation structure of a battery cell and a spacer according to an embodiment of the present invention;

fig. 3 is a schematic view of an installation structure of the electric core assembly and the lower box body according to the embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a lower box according to an embodiment of the present invention;

FIG. 5 is an enlarged view at A of FIG. 4;

fig. 6 is a schematic view of an installation structure of the CCS integrated board and the lower box according to the embodiment of the present invention;

FIG. 7 is a schematic view of an installation structure of an upper cover plate and a lower case provided in an embodiment of the present invention;

fig. 8 is a schematic view illustrating a first viewing angle of the BMS and the upper cover plate according to the embodiment of the present invention;

fig. 9 is a partial structural view of a second view angle between the BMS and the upper cover plate according to the embodiment of the present invention;

fig. 10 is a schematic view of an installation structure of a conductive block and a lower box according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of a low-voltage battery system according to an embodiment of the present invention.

In the figure:

11. a lower box body; 111. a limiting hole; 112. a limiting bulge; 113. a groove; 114. structural adhesive; 115. a connecting portion; 116. a conductive block; 1161. a limiting groove; 117. cell support ribs; 118. pouring a glue opening; 119. a sealing groove; 12. an upper cover plate; 121. a sealing cover; 122. a pressure relief valve; 123. a pole protective cover; 124. a mounting seat; 13. a seal member;

2. the electric core group; 21. an electric core; 22. a spacer sheet; 23. a cladding structure;

3. a CCS integrated board; 31. a CCS holder; 311. injecting glue holes; 312. a bracket connecting plate; 313. a battery cell vent hole; 32. busbar; 321. an output electrode; 33. an FFC; 34. an insulating cover plate;

4. a BMS; 41. a fastener;

5. a communication plug-in; 51. a PIN needle; 52. and (4) a plug.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solutions adopted by the present invention and the technical effects achieved by the present invention clearer, the following will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The embodiment provides a low-voltage battery system, as shown in fig. 1, which includes a box, a glue filling structure, and a plurality of battery cells 21 and a CCS integrated board 3 arranged in the box; specifically, CCS integrated board 3 and electric core 21 are fixed, the box is provided with limiting component and connecting portion 115, electric core 21 is fixed in the box through limiting component, CCS integrated board 3 and connecting portion 115 are fixed, and the potting compound structure is filled between the box and electric core 21.

The plurality of battery cells 21 are directly arranged in the box body, so that the structure of the battery system is simplified, the manufacturing cost is reduced, the space rate of the battery system is improved, and the energy density is further improved; the box body is provided with the limiting assembly and the connecting part 115, so that the fixed installation of the battery cell 21 and the CCS integrated board 3 is realized respectively, and the battery cell 21 is fixedly connected with the CCS integrated board 3, so that the structural installation stability is improved, and the stability of the use performance is further improved; the glue filling structure is filled between the battery cell 21 and the box body, so that the battery cell 21 and the box body are fixed, the rigidity of the whole battery system is increased, and the shock resistance is enhanced.

Optionally, each battery cell 21 is fixed to each other by a fixing member, so that each battery cell 21 forms an integral battery cell group 2, and is convenient to assemble with the box body. Optionally, as shown in fig. 2 and fig. 3, the fixing member includes a spacer 22 and a cladding structure 23, and two adjacent battery cells 21 are arranged at intervals through the spacer 22, so as to improve the safety use performance between the battery cells 21; the coating structure 23 coats all the battery cells 21, so that the battery cells 21 are fixed to each other; the flaky structure reduces the space between the battery cores 21, improves the space utilization rate of the battery core group 2, and further increases the energy density, specifically, the spacing piece 22 can be an insulating structure piece such as plastic, and the danger such as electric leakage short circuit is prevented. Specifically, the coating structure 23 may be a structural member, the spacers 22 may be integrated with the coating structure 23, and each of the battery cells 21 is fixed by coating the structural member and is arranged at intervals by the spacers 22; specifically, the spacers 22 may be bonded to two adjacent battery cells 21, respectively, so as to improve the structural installation stability.

In this embodiment, referring to fig. 2 and fig. 3, the cladding structure 23 and the spacer 22 are separate structures, specifically, the fixing member includes the spacer 22 and the cladding structure 23 made of a plastic material, the cladding structure 23 is a blue-coated film, the battery cells 21 are arranged at intervals through the spacer 22, and are fixed to form an integrated structure through the blue-coated film after being pre-tightened by the fixture, and the blue-coated film is light and thin in structure, so that the occupied space is reduced, and the energy density is further improved.

Optionally, as shown in fig. 4, the limiting assembly includes a limiting member fixed to the box, the limiting member abuts against the battery cell 21 to fix the battery cell 21, in this embodiment, as shown in fig. 4 and 5, a coated blue film is coated outside the battery cell 21, the limiting member includes a limiting protrusion 112 and a limiting hole 111 disposed on the box, a limiting pin is mounted on the limiting hole 111, the limiting protrusion 112 abuts against the battery cell 21, and the limiting pin abuts against the coated blue film; in other embodiments, the limiting member is adaptively adjusted according to the specific structure of the battery cell 21, and is not limited. In this embodiment, the limiting part is disposed on the diagonal angle of the box body, so as to limit the battery cell 21.

Optionally, the limiting assembly further includes a structural adhesive 114, the structural adhesive 114 is coated on the bottom of the box body, the box body and the battery cell 21 are bonded through the structural adhesive 114, so that the battery cell 21 and the box body are relatively fixed, specifically, as shown in fig. 4, a battery cell support rib 117 is arranged on the bottom of the box body on the box body, a groove 113 is formed between each battery cell support rib 117, the battery cell support rib 117 is used for supporting the battery cell 21, so that the battery cell 21 is stably installed, and the groove 113 is filled with the structural adhesive 114 and is used for bonding the battery cell 21. The limiting component may be only one of the limiting component and the structural adhesive 114, or both of them may be disposed at the same time, and may be disposed according to specific structural requirements. The structural adhesive 114 is a heat-conducting structural adhesive, so that heat dissipation of the battery cell 21 is improved.

Optionally, the CCS integrated board 3 includes a CCS bracket 31, and a busbar32 busbar and an FFC33(Flexible Flat Cable) integrated on the CCS bracket 31 to form an integrated structure, which facilitates modular assembly, specifically, the busbar32 and the battery cell 21 may be connected by laser welding or the like, the CCS bracket 31 is connected with the connection portion 115, specifically, as shown in fig. 6, a bracket connection board 312 is disposed on the CCS bracket 31, and the bracket connection board 312 is connected with the connection portion 115.

Optionally, a glue injection hole 311 is formed in the CCS support 31, the glue filling structure is filled between the box body and the battery cell 21 through the glue injection hole 311, in this embodiment, three glue injection holes 311 are formed in the CCS support 31, correspondingly, three glue filling ports 118 are formed in the box body, the glue injection holes 311 and the glue filling ports 118 are respectively arranged in a one-to-one correspondence manner, glue is filled into the box body through the glue injection holes 311 and the glue filling ports 118 in sequence to form the glue filling structure, and the three glue injection holes 311 are arranged at intervals to prevent uneven glue filling. Specifically, firstly, conducting welding between the busbar32 and the battery cell 21, then conducting bonding connection between the CCS support 31 and the connecting portion 115, the installation sequence can guarantee a small movement amount in the welding process, internal stress after gluing is reduced, glue is poured after installation is completed, and impact resistance is improved. Optionally, a cell vent hole 313 is formed in the CCS support 31, and when the pressure in the box is too high, the cell vent hole 313 is used for exhausting air, so that danger is prevented.

As shown in fig. 1 and fig. 7, optionally, the box body includes a lower box body 11 and an upper cover plate 12, where the battery cell 21 and the CCS integrated plate 3 are disposed in the lower box body 11, and the lower box body 11 and the upper cover plate 12 are separately disposed, so as to facilitate installation; specifically, as shown in fig. 7, the upper cover plate 12 is hermetically connected to the lower case 11 to improve the structural sealing performance of the battery system, a sealing groove 119 is formed in the lower case 11, and a sealing element 13 may be disposed in the sealing groove 119 or a sealing compound may be filled to form the sealing element 13, so that the upper cover plate 12 and the lower case 11 are hermetically connected. Optionally, the upper cover plate 12 and the lower case 11 are detachably connected by a fastener, so as to be convenient for disassembly and assembly. Specifically, the lower box body 11 is of a cast aluminum structure, so that the shock resistance is higher, the upper cover plate 12 is made of 66% of nylon and 30% of glass fiber through an injection molding process, the structural strength is high, and the lower box body has better shock resistance; be provided with the output utmost point copper bar on the upper cover plate 12, the output utmost point copper bar inlays locates upper cover plate 12, reduces the installation degree of difficulty, and saves the inner space.

Alternatively, as shown in fig. 8, the low voltage BATTERY system further includes a BMS (BATTERY MANAGEMENT SYSTEM )4 and a communication plug 5 connected to the BMS4, wherein the BMS4 is detachably connected to the upper cover plate 12 by a fastening member 41 or the like, the communication plug 5 penetrates the upper cover plate 12 and can be connected to the outside, the FFC33 is welded to the BMS4, and the communication plug 5 is integrated with the BMS4 to facilitate assembly and disassembly. Specifically, one side of BMS4, which is away from upper cover plate 12, is connected with a lock nut, and a set screw passes through upper cover plate 12 to be connected with lock nut, so that BMS4 is connected with upper cover plate 12. BMS4 is connected with upper cover plate 12 to form an upper cover module, which is convenient for forming modular assembly with lower case 11.

As shown in fig. 9, in the present embodiment, the upper cover plate 12 is provided with a mounting seat 124 along the x direction, and the communication plug 5 is provided in the BMS4 along the x direction, so that when the upper cover plate 12 is connected to the BMS4, the communication plug 5 penetrates the mounting seat 124 and is used for connecting to the outside, specifically, the communication plug 5 is connected to the harness connector at the end of the entire vehicle. In this embodiment, the communication plug-in unit 5 includes the PIN 51, and both ends of the PIN 51 are electrically connected to the BMS4 and the harness connector of the vehicle end, respectively, so that the electrical connection between the BMS4 and the harness connector of the vehicle end is realized through the PIN 51, thereby avoiding the use of a communication harness to electrically connect the BMS4 and the harness connector of the vehicle end, and simplifying the low-voltage communication connector; the PIN 51 is low cost, thereby reducing the cost of the communication card 5.

Specifically, the communication plug-in 5 further comprises a plug 52 fixedly connected to the BMS4, the PIN 51 is fixedly connected to the BMS4 and the upper cover plate 12 through the plug 52 and the mounting seat 124, respectively, the plug 52 is fixedly connected to the mounting seat 124 after the BMS4 and the upper cover plate 12 are assembled, the mounting seat 124 serves as an intermediate connection carrier, the plug 52 is fixedly connected to the harness connector at the vehicle end by arranging a structure matched with the plug 52 and the harness connector at the vehicle end on the mounting seat 124, the PIN 51 is fixedly connected through the fixed connection of the mechanical structure, and therefore the PIN 51 is electrically connected stably and reliably; the plug 52 is connected with the mounting seat 124 when the upper cover plate 12 is assembled with the BMS4, so that the wiring harness switching is omitted, the assembly process is simplified, and the assembly is convenient. Specifically, the specific structures and specific connection structures of the plug 52, the mounting seat 124, and the PIN 51 are not described in detail, and the connection may be implemented.

Optionally, as shown in fig. 10, a conductive block 116 is detachably connected to the lower case 11, the buss bar32 includes an output electrode 321, and the conductive block 116 is used for connecting the BMS4 and the output electrode 321, so as to realize the electrical connection between the BMS4 and the output electrode 321; specifically, the conductive block 116 is provided with a limiting groove 1161, and the output electrode 321 is clamped in the limiting groove 1161; the conductive block 116 is provided with a connecting hole, the output electrode 321 and the BMS4 are respectively provided with a connecting hole, and the fastener sequentially penetrates through the connecting hole on the BMS4 and the connecting hole on the output electrode 321 and is fixedly locked with the connecting hole on the conductive block 116, so that the structural fixed connection is realized, and the reliability of the electrical connection is ensured. The conductive block 116 may be fastened to the lower case 11 by a fastener such as a screw.

Optionally, referring to fig. 6, CCS integrated board 3 further includes an insulating cover 34 clamped to CCS support 31, where insulating cover 34 is disposed between buss bar32 and upper cover 12, and insulating cover 34 is used for insulating and protecting buss bar 32.

As shown in fig. 11, optionally, the sealing cover 121 is hermetically connected to the upper cover plate 12, the sealing cover 121 may be made of PC material by an injection molding process, and is locked to the upper cover plate 12 by a screw thread, a rubber ring is disposed between the sealing cover 121 and the upper cover plate 12, and a locking force compresses the rubber ring to achieve the hermetic connection between the sealing cover 121 and the upper cover plate 12.

As shown in fig. 11, optionally, upper cover plate 12 is connected with relief valve 122 in a sealing manner, relief valve 122 is formed by injection molding of a non-metallic material, a rubber ring is arranged between relief valve 122 and upper cover plate 12, the rubber ring is compressed by a locking force to realize the sealing connection between relief valve 122 and upper cover plate 12, when electric core 21 is out of thermal runaway, the inside of the box body reaches a certain pressure, and relief valve 122 is opened to release the internal pressure, so that risks such as explosion are prevented.

As shown in fig. 11, optionally, an electrode post protection cover 123 is connected to the upper cover plate 12, the electrode post protection cover 123 is used for insulating and protecting an electrode post, and the electrode post protection cover 123 has opening and closing functions, so that the use is convenient.

Specifically, the battery cell 21 can adopt a lithium iron phosphate battery cell, and is lead-free and more environment-friendly.

Optionally, the assembly process step of the low-voltage battery system comprises:

s1: the lower box body 11 is sequentially provided with the electric core group 2, the conductive block 116, the CCS integrated board 3 and the insulating cover plate 34;

s2: the upper cover plate 12 is connected with the BMS4 to form an upper cover module;

s3: the upper cover module is arranged on the lower box body 11, the FFC33 is welded with the BMS4, and then the upper cover plate 12 is hermetically connected with the lower box body 11 through structures such as sealant;

s4: a seal cap 121, a relief valve 122, an electrode protection cap 123, and the like are attached to the upper cover plate 12.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A low-voltage battery system, comprising:

a plurality of cells (21);

the CCS integrated board (3), the CCS integrated board (3) and the battery core (21) are fixedly arranged;

the battery cell is characterized by comprising a box body, wherein a limiting assembly and a connecting part (115) are arranged on the box body, the battery cell (21) is fixedly arranged in the box body through the limiting assembly, and the CCS integrated board (3) and the connecting part (115) are fixedly arranged;

and the glue filling structure is filled between the box body and the battery cell (21).

2. The low-voltage battery system according to claim 1, characterized in that each of the cells (21) forms a cell group (2), and each of the cells (21) is fixed to each other by a fixing member, and the fixing member comprises:

the spacing pieces (22) are arranged between two adjacent battery cells (21) at intervals;

and the coating structure (23) is coated outside the electric core group (2).

3. The low-voltage battery system of claim 1, wherein the limiting assembly comprises:

the limiting piece is fixed to the box body and is abutted against the battery cell (21); and/or

The structure glue (114) is coated on the bottom of the box body, and the box body is adhered with the battery cell (21) through the structure glue (114).

4. A low-voltage battery system according to any one of claims 1 to 3, characterized in that the CCS manifold (3) comprises a CCS support (31), and a buss bar (32) and an FFC (33) integrated on the CCS support (31), the buss bar (32) being welded to the battery cell (21), and the CCS support (31) being connected to the connection portion (115).

5. The low-voltage battery system according to claim 4, wherein the CCS bracket (31) is provided with a glue injection hole (311), and the glue injection structure is filled between the box body and the battery cell (21) through the glue injection hole (311).

6. The low-voltage battery system according to claim 4, wherein the case includes:

the battery cell (21) and the CCS integrated board (3) are arranged on the lower box body (11);

and the upper cover plate (12) is connected to the lower box body (11) in a sealing manner.

7. The low voltage battery system according to claim 6, further comprising a BMS (4) and a communication plug (5) connected to the BMS (4), wherein the BMS (4) is detachably connected to the upper cover plate (12), the communication plug (5) penetrates the upper cover plate (12) and is capable of being connected to the outside, and the FFC (33) is welded to the BMS (4).

8. The low voltage battery system according to claim 7, wherein a conductive block (116) is detachably attached to the lower case (11), and the busbar (32) includes an output electrode (321), and the conductive block (116) is used to connect the BMS (4) and the output electrode (321).

9. The low-voltage battery system according to claim 6, wherein the CCS integrated board (3) further comprises an insulating cover plate (34) clamped with the CCS bracket (31), the insulating cover plate (34) is arranged between the busbar (32) and the upper cover plate (12), and the insulating cover plate (34) is used for insulating and protecting the busbar (32).

10. The low-voltage battery system according to claim 6,

the upper cover plate (12) is hermetically connected with a sealing cover (121); and/or

The upper cover plate (12) is connected with a pressure release valve (122) in a sealing manner; and/or

The pole protection cover (123) is connected to the upper cover plate (12), and the pole protection cover (123) is used for insulating and protecting a pole.