Battery pack and electronic equipment

Abstract

The utility model relates to a battery pack and electronic equipment, and the battery pack comprises a shell which is provided with a containing cavity, and one end of the containing cavity along a first direction is provided with an opening; the end cover covers the opening and can move in the first direction relative to the shell; the battery module is arranged in the accommodating cavity, and the battery module comprises a plurality of battery cells arranged along a first direction; the pressure sensor is connected with any one of the battery cells and is used for detecting the stress of the battery cells along the first direction; the adjusting assembly is connected with the shell and the end cover, and the adjusting assembly is electrically connected with the pressure sensor and used for driving the end cover to move relative to the shell in the first direction. The end cover of the battery pack can move in the first direction relative to the shell, the pressure sensor detects the stress of the battery cell in the first direction, and the adjusting assembly drives the end cover to move in the first direction relative to the shell according to the feedback of the pressure sensor, so that the expansion force borne by the battery cell is adjusted; and faults or safety accidents caused by deformation of the battery module due to expansion of the battery core can be avoided.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack and an electronic device. Background Art

[0002] With the continuous development of lithium battery technology, secondary lithium batteries are widely used in power, consumption, energy storage and other fields. During the long-term charge and discharge cycle, the battery cell will expand to a certain extent due to lithium deintercalation and gas production. The increasing expansion force will cause the structural deformation of the battery module. If the deformation exceeds a certain degree, the battery module will fail or cause a safety accident. Utility Model Content

[0003] Based on this, it is necessary to provide a battery pack and electronic device to address the above technical problems, which can adjust the expansion force on the battery cells, thereby preventing the battery cells from expanding and deforming the battery module, causing failures or safety accidents.

[0004] In a first aspect, the present application provides a battery pack, comprising:

[0005] The housing has a housing cavity, and one end of the housing cavity along the first direction has an opening;

[0006] an end cover, covering the opening and movable relative to the housing along the first direction;

[0007] A battery module is disposed in the accommodating cavity, wherein the battery module comprises a plurality of battery cells arranged along the first direction;

[0008] A pressure sensor, connected to any one of the battery cells and used to detect the magnitude of the force applied to the battery cell along the first direction;

[0009] An adjusting component is connected to the shell and the end cover respectively. The adjusting component is electrically connected to the pressure sensor and is used to drive the end cover to move relative to the shell along the first direction.

[0010] In one embodiment, the pressure sensor is disposed between the end cover and the battery cell closest to the end cover.

[0011] In one of the embodiments, the adjustment assembly includes a linear drive, the linear drive is electrically connected to the pressure sensor, the linear drive is mounted on the housing or the end cover, and the linear drive is used to drive the housing and the end cover to move relative to each other along the first direction.

[0012] In one embodiment, the adjustment assembly includes a rotary driver, a connecting rod and a nut member, the rotary driver is electrically connected to the pressure sensor, the two ends of the connecting rod along the first direction are respectively a proximal end and a distal end, the distal end is fixedly connected to the shell, the proximal end is provided with an external thread and is threadedly connected to the nut member, the rotary driver is mounted on the end cover, and the output shaft of the rotary driver is connected to the nut member and is used to drive the nut member to rotate.

[0013] In one embodiment, the adjustment assembly includes a rotary drive and a connecting rod, the rotary drive is electrically connected to the pressure sensor, the two ends of the connecting rod along the first direction are respectively a proximal end and a distal end, the distal end is provided with an external thread, the shell is provided with a threaded hole, the distal end is connected to the shell by a thread, the rotary drive is mounted on the end cover, and the output shaft of the rotary drive is connected to the connecting rod and is used to drive the connecting rod to rotate.

[0014] In one of the embodiments, the battery pack includes two adjustment components, and the two adjustment components are respectively disposed on two opposite side walls of the shell.

[0015] In one of the embodiments, the shell is provided with a slideway extending along the first direction, and the end cover is provided with a guide rib inserted into the slideway.

[0016] In one of the embodiments, the housing has a side wall extending along the first direction, and the side wall is provided with a liquid cooling pipe.

[0017] In one of the embodiments, two ends of the side wall along the first direction are a front end and a rear end respectively, and the liquid cooling pipe extends from the front end to the rear end and turns back multiple times between the front end and the rear end.

[0018] In a second aspect, the present application also provides an electronic device, comprising the battery pack described above.

[0019] The above introduces a battery pack and an electronic device, which includes a shell, an end cover, a battery module, a pressure sensor and an adjustment component. The end cover can move relative to the shell in a first direction. The pressure sensor detects the force applied to the battery cell along the first direction. The adjustment component drives the end cover to move relative to the shell in the first direction according to feedback from the pressure sensor, thereby adjusting the expansion force applied to the battery cell, which is beneficial to avoid deformation of the battery module due to expansion of the battery cell, thereby causing failure or safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of a three-dimensional structure of a battery pack provided in an embodiment of the present application;

[0021] Figure 2 An exploded schematic diagram of a battery pack provided in an embodiment of the present application;

[0022] Figure 3 An exploded schematic diagram of a local structure of a battery pack provided in an embodiment of the present application;

[0023] Figure 4 A cross-sectional view of a partial structure of a battery pack provided in an embodiment of the present application;

[0024] Figure 5 A cross-sectional view of a shell provided in an embodiment of the present application.

[0025] The reference numerals in the embodiments of the present application are described as follows:

[0026] Battery pack 100, shell 10, left side wall 11, right side wall 12, bottom plate 13, fixing plate 14, accommodating chamber 15, slide 16, liquid cooling pipe 17, inlet 171, outlet 172, pipe joint 18, rod hole 19, end cover 20, guide rib 21, battery module 30, battery cell 31, pressure sensor 40, rotation driver 51, motor 511, reducer 512, output shaft 513, connecting rod 52, threaded portion 521, nut member 53, sleeve 54, proximal end P, distal end Q, front end F, rear end B. DETAILED DESCRIPTION

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0028] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0029] Please also read Figures 1 to 3 The battery pack 100 of this embodiment includes a shell 10, an end cover 20, a battery module 30, a pressure sensor 40 and an adjustment component.

[0030] The shell 10 has a accommodating cavity 15, and one end of the accommodating cavity 15 along the first direction X has an opening; the end cover 20 covers the opening and can move relative to the shell 10 along the first direction X; the battery module 30 is arranged in the accommodating cavity 15, and the battery module 30 includes a plurality of battery cells 31 arranged along the first direction X; the pressure sensor 40 is connected to any one of the battery cells 31, and is used to detect the force applied to the battery cell 31 along the first direction X; the adjustment component is connected to the shell 10 and the end cover 20 respectively, and the adjustment component is electrically connected to the pressure sensor 40 and is used to drive the end cover 20 to move along the first direction X relative to the shell 10.

[0031] In this embodiment, a plurality of battery cells 31 are arranged along a first direction X in the accommodating cavity 15 of the shell 10. The expansion of the battery cells 31 in the first direction X will cause the battery cells 31 to squeeze each other and generate an expansion force. The pressure sensor 40 is connected to any one of the battery cells 31 to detect the expansion force and feed back a signal to the adjustment component. If the expansion force exceeds a threshold value, the adjustment component drives the end cover 20 to move relative to the shell 10 to increase the distance between the battery cells 31, thereby reducing the expansion force.

[0032] In this embodiment, the housing 10 is in a rectangular parallelepiped shape, and the first direction X is the length direction of the housing 10 , that is, the plurality of battery cells 31 are arranged along the length direction of the housing 10 .

[0033] The housing 10 may be integrally formed or assembled from a plurality of panels. The housing 10 may also be referred to as a box.

[0034] The battery pack 100 may be provided with a controller, which is electrically connected to the pressure sensor 40 and the driver of the regulating component, and controls the operation of the driver of the regulating component according to the feedback signal of the pressure sensor 40. The controller may also be regarded as a part of the regulating component.

[0035] In one embodiment, the pressure sensor 40 is disposed between the end cap 20 and the battery cell 31 closest to the end cap 20. The movement of the end cap 20 will directly affect the detection value of the pressure sensor 40 in real time, thereby improving the accuracy of adjusting the expansion force of the battery cell 31 and facilitating the installation and threading of the pressure sensor 40.

[0036] In one embodiment, see Figure 4The adjustment assembly includes a rotary driver 51, a connecting rod 52 and a nut member 53. The rotary driver 51 is electrically connected to the pressure sensor 40. The two ends of the connecting rod 52 along the first direction X are respectively a proximal end P and a distal end Q. The distal end Q is fixedly connected to the housing 10. The proximal end P is provided with an external thread and is threadedly connected to the nut member 53. The rotary driver 51 is mounted on the end cover 20. The output shaft 513 of the rotary driver 51 is connected to the nut member 53 and is used to drive the nut member 53 to rotate. When the rotary driver 51 drives the nut member 53 to rotate, the nut member 53 moves along the axis of the connecting rod 52, that is, the rotary driver 51 and the end cover 20 are driven to move relative to the housing 10 along the first direction X. The rotary driver 51 can be a motor 511, such as a stepping motor or a servo motor; the rotary driver 51 can also be a driving component assembled from a motor 511 and a reducer 512, and the output shaft 513 of the reducer 512 is the output shaft 513 of the rotary driver 51. The output shaft 513 of the rotary driver 51 can be first connected to the sleeve 54. The sleeve 54 is provided with a cavity at one end facing the connecting rod 52. A nut member 53 fixedly connected to the sleeve 54 is provided in the cavity. The proximal end P of the connecting rod 52 has a threaded portion 521, and the threaded portion 521 is threadedly connected to the nut member 53. The connecting rod 52 can be a threaded rod in the shape of an axis, and the housing 10 is provided with a rod hole 19 for the connecting rod 52 to pass through. The distal end Q of the connecting rod 52 is fixedly connected to the housing 10. For example, the cross-sectional shape of the distal end Q of the connecting rod 52 is a polygon, and the housing 10 is provided with a placement hole consistent with the polygonal shape, and the distal end Q of the connecting rod 52 is embedded in the placement hole, so that the connecting rod 52 cannot rotate relative to the housing 10.

[0037] The present application also provides another embodiment in which the rotary driver 51 is connected to the housing 10 through a connecting rod 52, namely: the adjustment assembly includes a rotary driver 51 and a connecting rod 52, the rotary driver 51 is electrically connected to the pressure sensor 40, the two ends of the connecting rod 52 along the first direction X are respectively a proximal end P and a distal end Q, the distal end Q is provided with an external thread, the housing 10 is provided with a threaded hole, the distal end Q is connected to the housing 10 through a thread, the rotary driver 51 is installed on the end cover 20, and the output shaft 513 of the rotary driver 51 is connected to the connecting rod 52 and is used to drive the connecting rod 52 to rotate. The rotary driver 51 drives the connecting rod 52 to rotate, and the connecting rod 52 is screwed in or out relative to the threaded hole of the housing 10, that is, the rotary driver 51 and the end cover 20 are driven to move relative to the housing 10 along the first direction X.

[0038] The present application also provides an embodiment in which the adjustment component adopts a linear drive, that is, the adjustment component includes a linear drive, the linear drive is electrically connected to the pressure sensor 40, the linear drive is installed on the housing 10 or the end cover 20, and the linear drive is used to drive the housing 10 and the end cover 20 to move relative to each other along the first direction X. The linear drive can be a linear motor, such as a voice coil motor. The stator of the linear drive is installed on the housing 10, and the mover is connected to the end cover 20; or, the stator is installed on the end cover 20, and the mover is connected to the housing 10.

[0039] In one embodiment, the battery pack 100 includes two adjustment components (using a rotary drive 51 or a linear drive), and the two adjustment components are respectively arranged on two opposite side walls of the housing 10, such as the left side wall 11 and the right side wall 12. In this way, the stability of the driving end cover 20 to move relative to the housing 10 can be improved.

[0040] In one embodiment, the housing 10 is provided with a slideway 16 extending along the first direction X, and the end cover 20 is provided with a guide rib 21 inserted into the slideway 16. The guide rib 21 cooperates with the slideway 16 to provide a guide for the movement of the end cover 20 relative to the housing 10, thereby improving the stability of the movement of the end cover 20. The guide rib 21 can be provided at the bottom of the end cover 20, and the slideway 16 can be provided on the inner side of the bottom plate 13 of the housing 10.

[0041] In one embodiment, see Figure 5 The housing 10 has a side wall extending along the first direction X, and a liquid cooling pipe 17 is provided on the side wall. The liquid cooling pipe 17 contains a coolant, which can reduce the temperature of the battery cell 31, so that the battery cell 31 works at a suitable temperature, reduce the expansion of the battery cell 31, and improve the working performance, reliability and safety of the battery cell 31. The side wall provided with the liquid cooling pipe 17 can be the left side wall 11, the right side wall 12, the bottom plate 13 or the top plate.

[0042] In one embodiment, the two ends of the side wall along the first direction X are the front end F and the rear end B, respectively, and the liquid cooling pipe 17 extends from the front end F to the rear end B and turns back multiple times between the front end F and the rear end B. Thus, the cooling range of the liquid cooling pipe 17 can cover most or all of the battery cells 31. The liquid cooling pipe 17 turns back multiple times between the front end F and the rear end B, which can expand the cooling range and improve the cooling efficiency.

[0043] The inlet 171 and the outlet 172 of the liquid cooling pipe 17 may be located on the same side of the housing 10, or may be located on opposite sides of the housing 10. The inlet 171 of the liquid cooling pipe 17 is provided at the bottom of the housing 10, and the outlet 172 is provided at the top of the housing 10. Both the inlet 171 and the outlet 172 of the liquid cooling pipe 17 may be provided with pipe joints 18 to facilitate the injection or discharge of the cooling liquid.

[0044] In addition, liquid cooling pipes 17 may also be provided on the end cover 20 of the housing 10 and the fixing plate 14 opposite to the end cover 20 , so as to further improve the cooling efficiency of the battery cell 31 .

[0045] The present application also provides an electronic device, comprising the battery pack 100 described above.

[0046] The above introduces a battery pack 100 and an electronic device. The battery pack 100 includes a shell 10, an end cover 20, a battery module 30, a pressure sensor 40 and an adjustment component. The end cover 20 can move along a first direction X relative to the shell 10. The pressure sensor 40 detects the force applied to the battery cell 31 along the first direction X. The adjustment component drives the end cover 20 to move along the first direction X relative to the shell 10 according to the feedback of the pressure sensor 40, thereby adjusting the expansion force applied to the battery cell 31, which is beneficial to avoid the battery cell 31 expanding and causing the battery module 30 to deform, thereby causing failure or safety accidents.

[0047] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A battery pack, characterized in that: include: The housing has a housing cavity, and one end of the housing cavity along the first direction has an opening; an end cover, covering the opening and movable relative to the housing along the first direction; A battery module is disposed in the accommodating cavity, wherein the battery module comprises a plurality of battery cells arranged along the first direction; A pressure sensor, connected to any one of the battery cells and used to detect the magnitude of the force applied to the battery cell along the first direction; An adjusting component is connected to the shell and the end cover respectively. The adjusting component is electrically connected to the pressure sensor and is used to drive the end cover to move relative to the shell along the first direction.

2. The battery pack according to claim 1, characterized in that: The pressure sensor is arranged between the end cover and the battery cell closest to the end cover.

3. The battery pack according to claim 1, characterized in that: The adjustment assembly includes a linear driver, which is electrically connected to the pressure sensor and mounted on the housing or the end cover, and is used to drive the end cover to move relative to the housing along the first direction.

4. The battery pack according to claim 1, characterized in that: The adjustment assembly includes a rotary driver, a connecting rod and a nut member, the rotary driver is electrically connected to the pressure sensor, the two ends of the connecting rod along the first direction are respectively a proximal end and a distal end, the distal end is fixedly connected to the shell, the proximal end is provided with an external thread and is threadedly connected to the nut member, the rotary driver is mounted on the end cover, and the output shaft of the rotary driver is connected to the nut member and is used to drive the nut member to rotate.

5. The battery pack according to claim 1, characterized in that: The adjustment assembly includes a rotary driver and a connecting rod, the rotary driver is electrically connected to the pressure sensor, the two ends of the connecting rod along the first direction are respectively a proximal end and a distal end, the distal end is provided with an external thread, the shell is provided with a threaded hole, the distal end is connected to the shell by a thread, the rotary driver is installed on the end cover, and the output shaft of the rotary driver is connected to the connecting rod and is used to drive the connecting rod to rotate.

6. The battery pack according to claim 1, characterized in that: The battery pack includes two adjusting components, and the two adjusting components are respectively arranged on two opposite side walls of the shell.

7. The battery pack according to claim 1, characterized in that: The housing is provided with a slideway extending along the first direction, and the end cover is provided with a guide rib inserted into the slideway.

8. The battery pack according to any one of claims 1 to 7, characterized in that: The housing has a side wall extending along the first direction, and the side wall is provided with a liquid cooling pipeline.

9. The battery pack according to claim 8, characterized in that: Two ends of the side wall along the first direction are a front end and a rear end respectively, and the liquid cooling pipe extends from the front end to the rear end and turns back multiple times between the front end and the rear end.

10. An electronic device, characterized in that: Comprising a battery pack as described in any one of claims 1 to 9.

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