Battery pack

Abstract

The utility model discloses a battery pack. The battery pack comprises a box body, a battery core stacking body and a pressure sensing assembly, the box body is provided with a first inner side wall and a second inner side wall which are opposite. The battery core stacking body is arranged in the box body, and the battery core stacking body is propped against the first inner side wall; the pressure sensing assembly is arranged in the box body, the pressure sensing assembly is provided with a first side and a second side which are opposite to each other, the first side of the pressure sensing assembly abuts against the side, away from the first inner side wall, of the battery cell stacking body, the second side of the pressure sensing assembly abuts against the second inner side wall of the mounting cavity, and the pressure sensing assembly is used for monitoring the expansion force of the battery cell stacking body. When the battery core stacking body expands, the battery core stacking body extrudes the pressure sensing assembly, and the pressure sensing assembly can sense the expansion force of the battery core stacking body, so that the expansion force of the battery core stacking body is monitored.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of battery equipment, especially relates to a battery pack. BACKGROUND

[0002] The battery pack is usually composed of multiple battery cells. When the battery pack is working, the battery cells inside the battery pack will expand. The expansion force inside the battery pack has a great influence on the performance of the battery pack. When the expansion force is too large, it may damage the structure of the battery pack, affecting the sealing and safety of the battery pack. For example, it may cause the battery pack shell to rupture, electrolyte to leak, and other serious consequences. However, the existing battery pack does not have an expansion force monitoring function, which reduces the safety of the battery pack. SUMMARY

[0003] The main purpose of the utility model is to provide a battery pack, which aims to solve the technical problem of the lack of expansion force monitoring function in the battery pack in related technology, which reduces the safety of the battery pack.

[0004] In order to achieve the above-mentioned utility model purposes, the utility model provides a battery pack.

[0005] A battery pack comprises:

[0006] a box body having opposite first and second inner side walls;

[0007] a battery cell stack disposed in the box body and abutting against the first inner side wall; and

[0008] a pressure sensing assembly disposed in the box body, the pressure sensing assembly having opposite first and second sides, the first side of the pressure sensing assembly abutting against a side of the battery cell stack away from the first inner side wall, and the second side of the pressure sensing assembly abutting against the second inner side wall, the pressure sensing assembly being configured to monitor the expansion force of the battery cell stack.

[0009] In one embodiment, the battery pack further comprises a side plate located in the box body, the side plate being attached to a side of the battery cell stack away from the first inner side wall and abutting against a side of the pressure sensing assembly away from the second inner side wall.

[0010] In one embodiment, the pressure sensing assembly is provided in multiple numbers.

[0011] Along the length direction of the side plate, the multiple pressure sensing assemblies are spaced apart and abut against the side plate.

[0012] In one of the embodiments, the side plate is provided with a mounting portion on the side away from the stack of battery cells, and the mounting portion is used for mounting the pressure sensing assembly.

[0013] In one of the embodiments, the mounting portion comprises a first protruding strip and a second protruding strip, the first protruding strip and the second protruding strip are oppositely arranged, and the pressure sensing assembly is mounted between the first protruding strip and the second protruding strip.

[0014] In one of the embodiments, the top of the pressure sensing assembly is provided with a first inclined surface, and the first inclined surface is arranged to be inclined towards the second inner side wall; and / or

[0015] The bottom of the pressure sensing assembly is provided with a second inclined surface, and the second inclined surface is arranged to be inclined towards the second inner side wall.

[0016] In one of the embodiments, the pressure sensing assembly comprises a pressure sensing block and a pressure sensor, the pressure sensor is arranged inside the pressure sensing block, the pressure sensing block is arranged in the box, and the pressure sensing block abuts against the stack of battery cells and the second inner side wall respectively.

[0017] In one of the embodiments, the box comprises a bottom plate and a frame, the frame is provided with a cross beam and a longitudinal beam, the cross beam and the longitudinal beam are connected, and the bottom plate is detachably connected to the bottom of the cross beam and the longitudinal beam, the cross beam, the longitudinal beam and the bottom plate enclose a plurality of mounting cavities, and the plurality of mounting cavities are used for mounting the stack of battery cells and the pressure sensing assembly.

[0018] In one of the embodiments, the cross beam is arranged to extend in a first direction, the longitudinal beam is arranged to extend in a second direction, the first direction intersects the second direction, and the longitudinal beam separates the mounting cavities into a first cavity and a second cavity adjacent in the first direction;

[0019] The plurality of pressure sensing assemblies comprises a first pressure sensing assembly and a second pressure sensing assembly, the first pressure sensing assembly is located in the first cavity, the second pressure sensing assembly is located in the second cavity, the first pressure sensing assembly abuts against the side of the longitudinal beam, and the second pressure sensing assembly abuts against the other side of the longitudinal beam.

[0020] In one of the embodiments, the box further comprises a pressing plate, the pressing plate is detachably arranged on the top of the frame, and the pressing plate is oppositely arranged with the bottom plate.

[0021] Advantages:

[0022] The battery pack of the utility model discloses, the box has opposite first inner side wall and second inner side wall. The electric core stack is arranged in the box, and the electric core stack is in abutment with the first inner side wall. The pressure sensing assembly is arranged in the box, and the pressure sensing assembly has opposite first side and second side, the first side of the pressure sensing assembly is in abututment with the side of the electric core stack away from the first inner side wall, and the second side of the pressure sensing assembly is in abututment with the second inner side wall. When the electric core stack expands, the electric core stack will be extruded towards the pressure sensing assembly, and the pressure sensing assembly can sense the expansion force of the electric core stack, thereby monitoring the expansion force of the electric core stack. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the exploded view of the battery pack of the utility model one embodiment.

[0024] Figure 2 It is the top view of the battery pack of the utility model one embodiment.

[0025] Figure 3 It is the perspective view of the battery pack of the utility model one embodiment.

[0026] Figure 4 It is the structure schematic diagram of the box of the utility model one embodiment.

[0027] Figure 5 It is the exploded view of the box and the electric core stack of the utility model one embodiment.

[0028] Figure 6 It is the structure schematic diagram of the side plate and the pressure sensing assembly of the utility model one embodiment.

[0029] Figure 7 It is the internal structure diagram of the side plate and the pressure sensing assembly of the utility model one embodiment.

[0030] Among them:

[0031] 100, box;110, first inner side wall;120, second inner side wall;130, bottom plate;140, frame;141, crossbeam;142, longitudinal beam;150, pressing plate;160, box cover;

[0032] 200, electric core stack;

[0033] 300, pressure sensing assembly;310, pressure sensing block;320, pressure sensor;330, first inclined surface;340, second inclined surface;

[0034] 400, side plate;410, mounting portion;411, first protruding strip;412, second protruding strip.

[0035] The purposes, functional features and advantages of the utility model will be further explained in combination with embodiments and with reference to the drawings. DETAILED DESCRIPTION

[0036] It should be understood that the specific embodiments described herein merely exemplify the utility model and are not intended to limit the utility model.

[0037] In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0038] In the description of the utility model, it should be noted that, unless otherwise specifically specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected, it can be mechanical connection, it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication between two elements or the interaction relationship between two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0039] In the utility model, unless otherwise specifically specified and limited, the "upper" or "lower" of the first feature to the second feature can include the direct contact of the first and second features, or the contact of the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include the vertical direction of the first feature above and oblique above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include the vertical direction of the first feature below and oblique below the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0040] As Figures 1 to 5As shown, in some embodiments, a battery pack includes a box 100, a cell stack 200, and a pressure sensing assembly 300. The box 100 has opposite first and second inner side walls 110 and 120. The cell stack 200 is disposed in the box 100, and the cell stack 200 abuts the first inner side wall 110. The pressure sensing assembly 300 is disposed in the box 100, the pressure sensing assembly 300 has opposite first and second sides, the first side of the pressure sensing assembly 300 abuts a side of the cell stack 200 away from the first inner side wall 110, and the second side of the pressure sensing assembly 300 abuts the second inner side wall 120. The pressure sensing assembly 300 is configured to monitor an expansion force of the cell stack 200. When the cell stack 200 expands, the cell stack 200 presses against the pressure sensing assembly 300, and the pressure sensing assembly 300 is configured to sense the expansion force of the cell stack 200, thereby monitoring the expansion force of the cell stack 200.

[0041] In some embodiments, the battery pack further includes a side plate 400 disposed in the box 100, the side plate 400 is attached to a side of the cell stack 200 away from the first inner side wall 110, and the side plate 400 abuts a side of the pressure sensing assembly 300 away from the second inner side wall 120. Specifically, the side plate 400 is disposed in the box 100, and the side plate 400 is not fixed in the box 100. When the cell stack 200 expands, the cell stack 200 pushes the side plate 400 to move, thereby transmitting the expansion of the cell stack 200 to the pressure sensing assembly 300.

[0042] It should be noted that when the cell stack 200 expands, the expansion force first acts on the side plate 400. The side plate 400 is closely attached to the cell stack 200, and can uniformly transmit the expansion force of the cell stack 200 to the pressure sensing assembly 300. In this way, the problem that the expansion force may not be uniform due to the inconsistent expansion of the cell stack 200 or the uneven contact with the pressure sensing assembly 300 is avoided. The side plate 400 is disposed between the cell stack 200 and the pressure sensing assembly 300, so that the expansion force of the cell stack 200 can be transmitted to the pressure sensing assembly 300 in a more uniform and stable manner, so that the pressure sensing assembly 300 can accurately measure the expansion force, and the accuracy of the pressure sensing assembly 300 in monitoring the expansion force is improved.

[0043] Specifically, multiple pressure sensing components 300 are configured. Along the length of the side plate 400, multiple pressure sensing components 300 are spaced apart and abut against the side plate 400. When the cell stack 200 expands, the distribution of the expansion force on the side plate 400 is not entirely uniform. By setting multiple pressure sensors 320 and spaced them together along the length of the side plate 400, the expansion force at different locations on the side plate 400 can be monitored more comprehensively, thus obtaining a more accurate distribution of the expansion force.

[0044] Specifically, each side plate 400 is equipped with three pressure sensing components 300. The BMS can monitor and record the real-time expansion force of each cell stack 200, and the monitoring data can be used to help determine the battery's cycle health status. If one of the cells experiences a thermal runaway event, an abnormal change in the expansion force between the cell stacks 200 will occur simultaneously. The real-time expansion force monitoring data can be used simultaneously to assist in early warning of thermal runaway events, thereby improving the safety of the battery pack.

[0045] In some embodiments, a mounting portion 410 is provided on the side of the side plate 400 opposite to the side plate 200, for mounting the pressure sensing component 300. This arrangement ensures that the pressure sensing component 300 accurately abuts against the side plate 400, maintaining a stable position and avoiding measurement errors caused by displacement of the pressure sensing component 300. For example, when the battery pack is subjected to vibration or slight impact, the mounting portion 410 prevents the pressure sensing component 300 from shaking, keeping it in close contact with the side plate 400, thereby accurately acquiring the expansion force data of the cell stack 200.

[0046] like Figure 6 As shown, specifically, the mounting portion 410 includes a first protruding strip 411 and a second protruding strip 412, which are arranged opposite to each other. The pressure sensing component 300 is mounted between the first protruding strip 411 and the second protruding strip 412. The first protruding strip 411 and the second protruding strip 412 are arranged opposite to each other to form a mounting groove. The pressure sensing component 300 is disposed within the mounting groove. The distance between the first protruding strip 411 and the second protruding strip 412 is adapted to the width of the pressure sensing component 300. During installation, the pressure sensing component 300 is inserted between the first protruding strip 411 and the second protruding strip 412.

[0047] Specifically, the first protruding strip 411 and the second protruding strip 412 can be reinforcing ribs of the side plate 400.

[0048] Specifically, the first protruding strip 411 and the second protruding strip 412 are arranged in parallel.

[0049] like Figure 7As shown, in some embodiments, the pressure sensing assembly 300 includes a pressure sensing block 310 and a pressure sensor 320, the pressure sensor 320 is arranged inside the pressure sensing block 310, the pressure sensing block 310 is arranged inside the box 100, and the pressure sensing block 310 abuts the cell stack 200 and the second inner side wall 120, respectively.

[0050] In some embodiments, the top of the pressure sensing assembly 300 is provided with a first inclined surface 330, which is arranged to be inclined towards the second inner side wall 120. That is, the top of the pressure sensing assembly 300 is provided with a chamfer structure, which provides a wire passing space for the pressure sensor 320.

[0051] Specifically, the bottom of the pressure sensing assembly 300 is provided with a second inclined surface 340, which is arranged to be inclined towards the second inner side wall 120. That is, the bottom of the pressure sensing assembly 300 is provided with a chamfer structure.

[0052] It should be noted that during the installation of the pressure sensing block 310 from top to bottom, the side plate 400 will be pushed to move to the left and compress the internal foam of the cell stack 200, so as to achieve the design pre-tightening force requirement of the cell stack 200. The cell stack 200 will be changed from a free state without pre-tightening force to a foam compression pre-tightening state. The pressure sensing block 310 can be designed with multiple thickness specifications to absorb the tolerances of the internal cell stack 200 and the parts of the box 100, so as to achieve the design pre-tightening force requirement of the cell stack 200. Or used to match the adjustment function of different pre-tightening forces of different system cell stacks 200.

[0053] Specifically, the side plate 400 can be a metal plate.

[0054] In some embodiments, the box 100 includes a bottom plate 130 and a frame 140, the frame 140 is provided with a cross beam 141 and a longitudinal beam 142, the cross beam 141 and the longitudinal beam 142 are connected, and the bottom plate 130 is detachably connected to the bottom of the cross beam 141 and the longitudinal beam 142. The cross beam 141, the longitudinal beam 142 and the bottom plate 130 enclose a plurality of mounting cavities for mounting the cell stack 200 and the pressure sensing assembly 300. Specifically, the material of the longitudinal beam 142 can be metal.

[0055] Specifically, the box 100 further includes a pressing plate 150, the pressing plate 150 is detachably arranged on the top of the frame 140, and the pressing plate 150 is arranged opposite to the bottom plate 130.

[0056] Specifically, the bottom plate 130 can be detachably connected with the bottom of the frame 140 by bolts. That is, the bottom plate 130 can be detachably connected with the bottom of the cross beam 141 and the longitudinal beam 142 by bolts. The pressing plate 150 is bolted to the top of the frame 140. That is, the pressing plate 150 is bolted to the top of the cross beam 141 and the longitudinal beam 142. The cell stack 200 is located between the bottom plate 130 and the pressing plate 150. The cover 160 is bolted to the top of the frame 140 to form a closed and high-strength battery pack.

[0057] In the related art, the soft-pack battery group basically needs a metal shell, and each surface of the metal shell forms a module closed cavity through welding or screwing during assembly. The module is screwed to the battery pack box 100 through the fixing points on the end plate of the metal shell. The metal shell of the soft-pack battery module increases the processing cost and weight of the battery pack and reduces the battery grouping efficiency.

[0058] The battery pack of the embodiment can cancel the module metal shell. The cell stack 200 can be assembled into a pre-tightening force-free state module by foam adhesion of the cells. The bottom plate 130 and the frame 140 are split, the cell stack 200 can be pre-assembled at the preset position of the bottom plate 130 (previously glued at the preset position of the bottom plate 130, and multiple cell stacks 200 are placed at the preset position), the frame 140 of the box 100 is placed on the bottom plate 130 from top to bottom, the frame 140 of the box 100 is installed on the bottom plate 130, and the bottom plate 130 and the frame 140 are connected by bolts. The cell stack 200 is fixed by the cross beam 141 and the longitudinal beam 142 of the frame 140, the grouping efficiency is improved, the cost of the battery pack is reduced, and the weight of the battery pack is reduced.

[0059] In some embodiments, the cross beam 141 extends along a first direction, the longitudinal beam 142 extends along a second direction, the first direction intersects the second direction, and the longitudinal beam 142 divides the mounting cavity into a first cavity and a second cavity adjacent along the first direction. The plurality of pressure sensing assemblies 300 includes a first pressure sensing assembly 300 and a second pressure sensing assembly 300, the first pressure sensing assembly 300 is located in the first cavity, the second pressure sensing assembly 300 is located in the second cavity, the first pressure sensing assembly 300 abuts a side surface of the longitudinal beam 142, and the second pressure sensing assembly 300 abuts another side surface of the longitudinal beam 142.

[0060] Specifically, the longitudinal beam 142 can be provided as two. The two longitudinal beams 142 are oppositely arranged, and the cell stack 200 is arranged between the two longitudinal beams 142. One longitudinal beam 142 faces a side wall of the cell stack 200 as a first inner side wall 110 of the box 100. The other longitudinal beam 142 faces a side wall of the cell stack 200 as a second inner side wall 120 of the box 100.

[0061] The above merely describes preferred embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, which are made by using the content of the present application specification and drawings, are also included in the patent protection scope of the present application.

Claims

1. A battery pack, characterized by, The battery pack comprises: a box body having opposite first and second inner side walls; an electric core stack arranged in the box body and abutting against the first inner side wall; and a pressure sensing assembly arranged in the box body, the pressure sensing assembly having opposite first and second sides, the first side of the pressure sensing assembly abutting against a side of the electric core stack away from the first inner side wall, and the second side of the pressure sensing assembly abutting against the second inner side wall, the pressure sensing assembly being configured to monitor the swelling force of the electric core stack. The battery pack further comprises a side plate arranged in the box body, the side plate being attached to a side of the electric core stack away from the first inner side wall and abutting against a side of the pressure sensing assembly away from the second inner side wall.

2. The battery pack of claim 1, wherein, The pressure sensing assembly is arranged in a plurality of groups.

3. The battery pack of claim 2, wherein, The plurality of groups of pressure sensing assemblies are spaced apart and abut against the side plate along the length direction of the side plate. The side of the side plate away from the electric core stack is provided with a mounting portion for mounting the pressure sensing assembly.

4. The battery pack of claim 2, wherein, The mounting portion comprises first and second protruding strips arranged opposite to each other, and the pressure sensing assembly is mounted between the first and second protruding strips.

5. The battery pack of claim 4, wherein, The top of the pressure sensing assembly is provided with a first inclined surface inclined towards the second inner side wall; and / or 6. The battery pack of claim 1, wherein, The bottom of the pressure sensing assembly is provided with a second inclined surface inclined towards the second inner side wall. The pressure sensing assembly comprises a pressure sensing block and a pressure sensor arranged inside the pressure sensing block, the pressure sensing block being arranged in the box body and abutting against the electric core stack and the second inner side wall, respectively.

7. The battery pack of claim 1, wherein, The box body comprises a bottom plate and a frame, the frame being provided with cross beams and longitudinal beams connected to each other, and the bottom plate being detachably connected to the bottom of the cross beams and longitudinal beams, the cross beams, longitudinal beams and bottom plate enclosing a plurality of mounting cavities for mounting the electric core stack and the pressure sensing assembly.

8. The battery pack of claim 1, wherein, The cross beams are arranged to extend along a first direction, the longitudinal beams are arranged to extend along a second direction, the first direction intersecting the second direction, and the longitudinal beams divide the mounting cavities into first and second cavities adjacent along the first direction.

9. The battery pack of claim 8, wherein, The plurality of pressure sensing assemblies comprises first and second pressure sensing assemblies, the first pressure sensing assembly being arranged in the first cavity and abutting against a side of the longitudinal beam, and the second pressure sensing assembly being arranged in the second cavity and abutting against another side of the longitudinal beam. The box body further comprises a pressing plate detachably arranged on the top of the frame, the pressing plate being arranged opposite to the bottom plate.

10. The battery pack of claim 8, wherein, ​

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