CN220290981U - Battery system - Google Patents

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery system which comprises a battery box, a clamping shell, a battery pack, a battery management module and an interface module. The clamping shell is arranged in the battery box and comprises a first shell and a second shell, and the first shell and the second shell are buckled and fixedly connected; the battery pack is clamped between the first shell and the second shell and comprises a plurality of battery cells, the battery cells are sequentially stacked along a first direction, and the first direction points to the first shell from the second shell; the battery management module is arranged in the battery box and is electrically connected with the battery pack; the interface module is exposed out of the battery box and arranged on the battery box, and is electrically connected with the battery management module. The multiple battery cells are stacked and clamped by the first shell and the second shell, the first shell and the second shell apply initial pretightening force to the battery cells, the battery cells are tightly and seamlessly connected, the energy density of a battery system is improved, and the cycle life of the battery cells is prolonged; and no structural adhesive is used between the battery cores, so that the space occupation of the structural adhesive is reduced.

Description

Battery system

Technical Field

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

Background

Electric vehicles generally require higher voltage and current, so that a plurality of single batteries need to be combined into a battery system in a serial, parallel or series-parallel mode.

In a conventional 12V battery system, the most basic components are: the battery box and the battery cells, wherein the battery cells are arranged in the battery box, assembled to form a battery pack through the form of fixing by structural adhesive, and fixed in the battery box.

However, the battery system formed by the structural adhesive is larger in height and grouping volume, so that the design size of the battery box is increased, and the battery system cannot adapt to the space requirement of the whole vehicle.

Disclosure of Invention

The utility model aims to provide a battery system, which can avoid the occupation of structural adhesive to the volume of the battery system and reduce the volume of the battery system.

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

a battery system, comprising:

a battery box;

the clamping shell is arranged in the battery box and comprises a first shell and a second shell, and the first shell and the second shell are buckled and fixedly connected;

the battery pack is clamped between the first shell and the second shell and comprises a plurality of electric cores, and the electric cores are sequentially stacked along a first direction, and the first direction points to the first shell from the second shell;

the battery management module is arranged in the battery box and is electrically connected with the battery pack;

the interface module is exposed out of the battery box and arranged on the battery box, is electrically connected with the battery management module and is configured to be connected with electric equipment.

Optionally, the end of the clamping shell on the second direction is provided with an avoidance gap, the second direction is perpendicular to the first direction, the electrode end of each electric core is located at the avoidance gap, and the battery management module is arranged at the avoidance gap and is connected with the electrode end of each electric core.

Optionally, the first casing includes roof, first curb plate and second curb plate, first curb plate with the second curb plate is in opposite directions the roof is in the both ends of third direction, the third direction the second direction with two liang of perpendicular of first direction, the second casing includes bottom plate, third curb plate and fourth curb plate, the third curb plate with the fourth curb plate is in opposite directions the both ends of bottom plate in the third direction, the roof with the bottom plate is relative, first curb plate with the third curb plate links to each other, the second curb plate with the fourth curb plate links to each other, the roof, first curb plate the second curb plate the bottom plate the third curb plate with the fourth curb plate is in one end in the second direction encloses into dodge breach, the group battery is inserted between roof and the bottom plate.

Optionally, a first step part is arranged on one of the first side plate and the third side plate, and the end part of the other side plate is embedded in the first step part; one of the second side plate and the fourth side plate is provided with a second step portion, and the other end portion is fitted into the second step portion.

Optionally, the battery box further comprises a limiting block, the battery box comprises a box body, one end of the box body in the second direction is opened, the other end of the box body is provided with a wall plate, the limiting block is arranged at one end, close to the opening, of the box body, and the second shell is clamped between the limiting block and the wall plate.

Optionally, still include being located dodge the piece that converges of breach department, it is in to converge the piece to fix press from both sides tight shell, battery management module sets up on the piece that converges, and with it is connected to converge the piece electricity, it has the bounding wall to press from both sides tight shell in the second direction keep away from dodge the one end of breach, the electrode terminal of group battery connect in the piece that converges, keep away from on the group battery the tip of electrode terminal supports and leans on the bounding wall.

Optionally, the battery pack includes at least two parallel groups, the parallel groups include a plurality of the electric cells, each of the parallel groups is sequentially arranged along a third direction, and the third direction is perpendicular to the first direction.

Optionally, the clamping shell further comprises an insulating plate, and the insulating plates are arranged between the adjacent parallel groups.

Optionally, the interface module includes output joint and connection pencil, output joint sets up on the battery box and expose in the battery box, connection pencil is located in the battery box, and one end connect in output joint, the other end connect in battery management module.

Optionally, a closable operation port is provided on the battery box, and the operation port is just opposite to one end of the connection harness connected with the battery management module.

The beneficial effects are that:

according to the battery system provided by the utility model, the clamping shell for clamping the battery pack is arranged in the battery box, and the electric energy of the battery pack is transmitted to the interface module exposed out of the battery box through the battery management module, so that the battery system can supply power to electric equipment. The multiple battery cells are clamped and fixed by the first shell and the second shell, the first shell and the second shell apply initial pretightening force to each battery cell, the battery cells are tightly and seamlessly connected, the volume energy density of a battery system is improved, and under a certain pretightening force, the expansion rate of pole pieces in the battery cells in the circulation process is reduced, so that the circulation life of the battery cells is prolonged; and the use of structural adhesive between the battery cores further reduces the occupation of the structural adhesive to the space.

Drawings

Fig. 1 is a schematic structural view of a battery system according to an embodiment of the present utility model;

fig. 2 is an exploded view of a battery system according to an embodiment of the present utility model;

FIG. 3 is an assembled schematic view of a clamp housing provided in an embodiment of the present utility model;

FIG. 4 is an exploded view of a clamp housing provided in accordance with an embodiment of the present utility model;

fig. 5 is a schematic structural diagram of a case according to an embodiment of the present utility model.

In the figure: 100. avoiding the notch;

1. a battery box; 11. a case; 111. an operation port; 112. a closing plate; 113. a pressure release valve; 114. a wall plate; 12. a cover body; 121. a seal ring; 122. perforating;

2. a clamping shell; 21. a first housing; 211. a top plate; 212. a first side plate; 213. a second side plate; 22. a second housing; 221. a bottom plate; 222. a third side plate; 2221. a first step portion; 223. a fourth side plate; 2231. a second step portion; 224. coaming plate; 23. an insulating plate; 24. a cushion pad;

31. a parallel group; 311. a battery cell;

4. a battery management module; 41. a harness connection interface;

5. an interface module; 51. an output joint; 511. a high pressure junction; 512. a low pressure junction;

6. a limiting block; 61. a gasket;

7. a confluence sheet; 71. and (5) fixing bolts.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", "left", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

As shown in fig. 1 and 2, the present embodiment provides a battery system including a battery box 1, a clamping case 2, a battery pack, a battery management module 4, a battery management module, and an interface module 5.

Specifically, as shown in fig. 2 to 4, the clamping shell 2 is arranged in the battery box 1, the clamping shell 2 comprises a first shell 21 and a second shell 22, and the first shell 21 and the second shell 22 are fastened and fixedly connected; the battery pack is sandwiched between the first housing 21 and the second housing 22, and the battery pack includes a plurality of battery cells 311, each battery cell 311 being stacked in sequence along a first direction, the first direction being directed from the second housing 22 to the first housing 21; the battery management module 4 is arranged in the battery box 1 and is electrically connected with the battery pack; the interface module 5 is exposed out of the battery box 1 and is arranged on the battery box 1, the interface module 5 is electrically connected with the battery management module 4, and the interface module 5 is configured to be connected with electric equipment. The battery management module 4 is a battery management system (Battery Management System, BMS) commonly used in the prior art, and is mainly used for scheduling the discharging and charging processes of the battery pack.

In the battery system provided in this embodiment, the clamping shell 2 for clamping the battery pack is disposed in the battery box 1, and the electric energy of the battery pack is transmitted to the interface module 5 exposed out of the battery box 1 through the battery management module 4, so as to realize the function of externally supplying power to the battery system. The multiple battery cells 311 are sequentially stacked and clamped and fixed by the first shell 21 and the second shell 22, the first shell 21 and the second shell 22 apply initial pretightening force to the battery cells 311, the battery cells 311 are tightly and seamlessly connected, the volume energy density of a battery system is improved, and under a certain pretightening force, the expansion rate of a pole piece in the battery cell 311 is reduced in the circulating process, so that the circulating life of the battery cell 311 is prolonged; the use of no structural adhesive between the battery cores 311 further reduces the occupation of space by the structural adhesive.

As shown in fig. 1 and 2, alternatively, the battery cell 311 is a flat core pack, the battery case 1 is a rectangular case, the first direction is the thickness direction of the battery cell 311, and the height direction of the battery case 1 is parallel to the first direction. Stacking the battery cells 311 in the thickness direction from bottom to top in the battery case 1 can reduce the dimension of the battery case 1 in the height direction, make the battery case 1 have dimensional redundancy in the height direction, and facilitate its arrangement on a vehicle.

Optionally, the end of the clamping shell 2 in the second direction is provided with an avoidance gap 100, the second direction is perpendicular to the first direction, the electrode ends of the battery cells 311 are all located at the avoidance gap 100, and the battery management module 4 is arranged at the avoidance gap 100 and is connected with the electrode ends of the battery cells 311. The design of the avoidance gap 100 can provide an avoidance space for the power connection of the battery pack, so that the electrode end of the battery pack can be conveniently connected to the battery management module 4.

As shown in fig. 2 to 4, further, the first case 21 includes a top plate 211, a first side plate 212 and a second side plate 213, the first side plate 212 and the second side plate 213 are oppositely disposed at two ends of the top plate 211 in the third direction, the second direction and the first direction are perpendicular to each other, the second case 22 includes a bottom plate 221, a third side plate 222 and a fourth side plate 223, the third side plate 222 and the fourth side plate 223 are oppositely disposed at two ends of the bottom plate 221 in the third direction, the top plate 211 and the bottom plate 221 are oppositely disposed, the first side plate 212 is connected with the third side plate 222, the second side plate 213 is connected with the fourth side plate 223, one ends of the top plate 211, the first side plate 212, the second side plate 213, the bottom plate 221, the third side plate 222 and the fourth side plate 223 in the second direction enclose a relief notch 100, and the battery pack is sandwiched between the top plate 211 and the bottom plate 221. Optionally, a cushion 24, such as a sponge, is further provided between the battery pack and the clamping case 2, and the cushion 24 can alleviate the influence of external vibration impact on the battery pack itself, thereby improving the safety of the battery pack.

As shown in fig. 3 and 4, in order to facilitate the relative positioning between the first housing 21 and the second housing 22 and improve the positioning accuracy, optionally, in both the first side plate 212 and the third side plate 222, a first step 2221 is provided on one of them, and the end of the other is fitted in the first step 2221; in both the second side plate 213 and the fourth side plate 223, a second stepped portion 2231 is provided, and an end portion of the other is fitted into the second stepped portion 2231. In the present embodiment, the first step portion 2221 is disposed outside the third side plate 222, the second step portion 2231 is disposed outside the fourth side plate 223, the inner side of the first side plate 212 is bonded to the outer side of the third side plate 222 and is fitted to the first step portion 2221, and the inner side of the second side plate 213 is bonded to the outer side of the fourth side plate 223 and is fitted to the second step portion 2231. In the present embodiment, after the relative positioning of the first housing 21 and the second housing 22 is completed, the first housing 21 and the second housing 22 can be welded together by a welding process, so that the connection therebetween is reliable. In other embodiments, the third side plate 222 and the first side plate 212, and the fourth side plate 223 and the second side plate 213 may be fixedly connected by a snap connection, so as to facilitate disassembly and assembly.

As shown in fig. 5, the battery system further includes a stopper 6, the battery box 1 includes a box body 11, one end of the box body 11 in the second direction is opened, the other end has a wall plate 114, the stopper 6 is disposed at one end of the box body 11 near the opening, and the second housing 22 is sandwiched between the stopper 6 and the wall plate 114. The limiting block 6 and the wall plate 114 of the box 11 fix the second shell 22 in the box 11, so that the second shell 22 is fixed relative to the box 11, and the first shell 21 and the second shell 22 are fixedly connected, therefore, the clamping shell 2 is fixed relative to the box 11, and the battery pack is fixed in the box 11. In this embodiment, the battery case 1 further includes a cover 12, where the cover 12 is disposed at the opening of the case 11, and seals the case 11. Specifically, the cover 12 is adhered to the opening of the case 11 by a sealant. The limiting block 6 is located in the case 11, and is fixed at the bottom wall of the case 11 near the cover 12 by bolts, and the wall plate 114 and the limiting block 6 clamp the second housing 22, thereby limiting the clamping shell 2.

Optionally, the battery system further includes a busbar 7 located at the avoidance gap 100, the busbar 7 is fixed on the clamping shell 2, the battery management module 4 is disposed on the busbar 7 and is electrically connected with the busbar 7, one end of the clamping shell 2, far away from the avoidance gap 100, in the second direction is provided with a coaming 224, the electrode end of the battery pack is connected to the busbar 7, and the end, far away from the electrode end, of the battery pack is abutted against the coaming 224. In the second direction, the battery is held in place by the shroud 224 and the buss plate 7.

Specifically, one end of the bus bar 7 in the first direction (the upper end of the bus bar 7 in fig. 2) is fixed to the top plate 211 of the first housing 21 by the fixing bolt 71, the other end of the bus bar 7 in the first direction (the lower end of the bus bar 7 in fig. 2) is fixed to the bottom plate 221 of the second housing 22 by the fixing bolt 71, fixing of the bus bar 7 to the clamp housing 2 is achieved, the electrode terminals of the respective cells 311 are welded to the side of the bus bar 7 facing the battery pack, and the ends of the respective cells 311 away from the electrode terminals abut against the surrounding plate 224, and therefore, the battery pack is restrained by the bus bar 7 and the surrounding plate 224 in the second direction. In the present embodiment, the shroud 224 is provided on the second housing 22 and is connected to the bottom plate 221, the third side plate 222, and the fourth side plate 223.

Optionally, the battery pack includes at least two parallel groups 31, the parallel groups 31 include a plurality of electric cells 311, and each parallel group 31 is sequentially arranged along a third direction, and the third direction is perpendicular to the first direction. The plurality of battery cells 311 are stacked in the first direction and connected in parallel with each other, so that a high-capacity parallel group 31 can be formed to increase the capacity of the battery system. The plurality of parallel groups 31 are arranged in the third direction, not in the first direction, so that the increase in the size of the battery system in the first direction is avoided, and the arrangement of the battery system on the whole vehicle is further affected. In the present embodiment, the parallel groups 31 are connected in series with each other, thereby increasing the output voltage of the battery system. To improve the safety of the battery system, the clamping shell 2 optionally further comprises insulating plates 23, and insulating plates 23 are arranged between adjacent parallel groups 31. In the present embodiment, the insulating plate 23 is a plastic plate.

To output the electric energy of the battery pack out of the battery box 1, optionally, the interface module 5 includes an output connector 51 and a connection harness, the output connector 51 is disposed on the battery box 1 and exposed to the battery box 1, the connection harness is disposed in the battery box 1, and one end of the connection harness is connected to the output connector 51, and the other end of the connection harness is connected to the battery management module 4. After the electric energy of the battery cell 311 group is regulated and controlled by the battery management module 4, the electric energy is transmitted from the connecting wire bundle to the output connector 51 exposed out of the battery box 1. In the present embodiment, the output connector 51 includes a high-voltage connector 511 and a low-voltage connector 512 to meet the power requirements of different electric devices on the vehicle. Further, the parallel group 31 has two, the high voltage power formed by connecting the two parallel groups 31 in series is output through the high voltage connector 511, and the low voltage power formed by one of the parallel groups 31 is output through the low voltage connector 512. In this embodiment, the cover 12 is provided with perforations 122 corresponding to the output connectors 51 one by one, and the output connectors 51 are respectively inserted into the corresponding perforations 122, extend out of the cover 12, and are fixed on the cover 12 by bolts. In order to improve the sealing property at the through hole 122, a seal ring 121 is interposed between the output connector 51 and the cover 12. In order to fix the output connector 51 and the cover 12 reliably, in this embodiment, the lower end of the output connector 51 is also fixed to the stopper 6 by a bolt and a washer 61.

In assembly, the output connector 51 is arranged on the cover 12, then the cover 12 is connected with the box 11, the box 11 is closed, at this time, the connecting wire harness is not connected with the battery management module 4, and in order to conveniently connect the connecting wire harness to the battery management module 4, optionally, a closable operation opening 111 is arranged on the battery box 1, and the operation opening 111 is opposite to one end of the connecting wire harness connected with the battery management module 4. Specifically, the operation port 111 is opened on the top wall of the case 11, and the sealing of the case 11 can be achieved by bolting the closing plate 112 to the case 11 after the connection harness and the battery management module 4 are connected through the operation port 111.

In order to improve the safety of the battery system, the case 11 is further provided with an automatic pressure release valve 113, and after the air pressure in the battery case 1 exceeds a threshold value, the pressure release valve 113 is automatically opened to release pressure, so that explosion caused by high pressure accumulation in the case 11 is avoided. In the present embodiment, the case 11 is a stamped case, and its manufacturing cost is low compared to a die-cast case.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. A battery system, comprising:

a battery box (1);

the clamping shell (2) is arranged in the battery box (1), the clamping shell (2) comprises a first shell (21) and a second shell (22), and the first shell (21) and the second shell (22) are buckled and fixedly connected;

the battery pack is clamped between the first shell (21) and the second shell (22), the battery pack comprises a plurality of electric cores (311), the electric cores (311) are sequentially stacked along a first direction, and the first direction is directed to the first shell (21) by the second shell (22);

the battery management module (4) is arranged in the battery box (1) and is electrically connected with the battery pack;

the interface module (5) is exposed out of the battery box (1) and is arranged on the battery box (1), the interface module (5) is electrically connected with the battery management module (4), and the interface module (5) is configured to be connected with electric equipment.

2. The battery system according to claim 1, wherein the end portion of the clamping case (2) in the second direction is provided with an avoidance gap (100), the second direction is perpendicular to the first direction, the electrode end of each cell (311) is located at the avoidance gap (100), and the battery management module (4) is disposed at the avoidance gap (100) and is connected to the electrode end of each cell (311).

3. The battery system according to claim 2, wherein the first housing (21) includes a top plate (211), a first side plate (212) and a second side plate (213), the first side plate (212) and the second side plate (213) are oppositely disposed at both ends of the top plate (211) in a third direction, the second direction and the first direction are perpendicular, the second housing (22) includes a bottom plate (221), a third side plate (222) and a fourth side plate (223), the third side plate (222) and the fourth side plate (223) are oppositely disposed at both ends of the bottom plate (221) in the third direction, the top plate (211) and the bottom plate (221) are opposite, the first side plate (212) and the third side plate (222) are connected, the second side plate (213) and the fourth side plate (223) are connected, and the top plate (211), the second side plate (212), the second side plate (213), the third side plate (221) and the fourth side plate (223) are disposed around the top plate (221) and the fourth side plate (223) are opposite to each other.

4. The battery system according to claim 3, wherein a first stepped portion (2221) is provided on one of the first side plate (212) and the third side plate (222), and an end portion of the other is fitted into the first stepped portion (2221); a second stepped portion 2231 is provided on one of the second side plate 213 and the fourth side plate 223, and an end portion of the other is fitted into the second stepped portion 2231.

5. The battery system according to claim 2, further comprising a stopper (6), wherein the battery case (1) includes a case (11), one end of the case (11) in the second direction is open, the other end has a wall plate (114), the stopper (6) is provided at one end of the case (11) near the opening, and the second case (22) is sandwiched between the stopper (6) and the wall plate (114).

6. The battery system according to claim 2, further comprising a bus bar (7) located at the avoidance gap (100), the bus bar (7) being fixed to the clamping case (2), the battery management module (4) being disposed on the bus bar (7) and electrically connected to the bus bar (7), the clamping case (2) having a shroud (224) at an end of the second direction away from the avoidance gap (100), an electrode end of the battery being connected to the bus bar (7), an end of the battery remote from the electrode end being abutted against the shroud (224).

7. The battery system according to claim 1, wherein the battery pack includes at least two parallel groups (31), the parallel groups (31) including a plurality of the cells (311), each of the parallel groups (31) being disposed in order along a third direction, the third direction being perpendicular to the first direction.

8. The battery system according to claim 7, wherein the clamping shell (2) further comprises insulating plates (23), the insulating plates (23) being arranged between adjacent parallel groups (31).

9. The battery system according to any one of claims 1-8, wherein the interface module (5) comprises an output connector (51) and a connection harness, the output connector (51) is provided on the battery box (1) and exposed to the battery box (1), and the connection harness is located in the battery box (1) and has one end connected to the output connector (51) and the other end connected to the battery management module (4).

10. The battery system according to claim 9, characterized in that the battery box (1) is provided with a closable operation opening (111), the operation opening (111) being at the end connected to the battery management module (4) with respect to the connection harness.