CN219067108U - Pretension adjusting part, battery package and energy storage system - Google Patents

Abstract

The utility model relates to a pretension adjusting component, a battery pack and an energy storage system, wherein the pretension adjusting component is used for being arranged on the side face of a battery cell array and is positioned on an expansion path of the battery cell array, and the pretension adjusting component comprises: a first pre-tightening plate; the second pre-tightening plate is arranged opposite to the first pre-tightening plate at intervals; the moving piece is connected between the first pre-tightening plate and the second pre-tightening plate, and can drive the first pre-tightening plate and the second pre-tightening plate to be close to or far away from each other; when the first pre-tightening plate and the second pre-tightening plate are at the maximum distance position, the pre-tightening adjusting assembly is in a pre-tightening state and has the maximum thickness value; when the first pretensioning plate and the second pretensioning plate are in the minimum approaching position, the pretensioning adjustment assembly is in a released state and has a minimum thickness value. The thickness reduction value of the pre-tightening adjusting component is equivalent to the increase of the space required by the expansion of the battery cell array, namely, the effect of releasing the extrusion stress between the battery cells is achieved, and the problem of mutual clamping of the battery cells is solved.

Description

Pretension adjusting part, battery package and energy storage system

Technical Field

The utility model relates to the technical field of batteries, in particular to a pre-tightening adjusting assembly, a battery pack and an energy storage system.

Background

Currently, the battery cell is directly integrated into the battery box by omitting the conventional battery module, so that the energy density of the battery pack can be effectively improved. In the related art, two end plates which are oppositely arranged can be installed on the battery box, the two end plates and the battery box enclose a containing cavity, the containing cavity is used for containing a plurality of battery monomers arranged in an array, and an expansion gap can be reserved between every two adjacent battery monomers at the moment so as to cope with reasonable expansion change of the battery monomers during working.

However, in some extreme cases, the failed battery cell will have an abnormal expansion, that is, the dimensional change after expansion will exceed a reasonable change value, so that the failed battery cell collides with the adjacent battery cell and further generates a large contact stress to cause a dead phenomenon.

Disclosure of Invention

Based on this, it is necessary to provide a pretension adjusting component, a battery pack and an energy storage system, which aims at solving the problems of high maintenance cost and resource waste in the prior art.

In one aspect, the present application provides a pretension adjustment assembly for mounting on a side of a battery cell array and on an expansion path of the battery cell array, the pretension adjustment assembly comprising:

a first pre-tightening plate;

the second pre-tightening plate is arranged opposite to the first pre-tightening plate at intervals; and

the moving part is connected between the first pre-tightening plate and the second pre-tightening plate and can drive the first pre-tightening plate and the second pre-tightening plate to be close to or far away from each other;

when the first pre-tightening plate and the second pre-tightening plate are at the maximum distance, the pre-tightening adjusting assembly is in a pre-tightening state and has the maximum thickness value; when the first pre-tightening plate and the second pre-tightening plate are at the minimum approaching position, the pre-tightening adjusting assembly is in a loosening state and has a minimum thickness value, and the maximum thickness value and the minimum thickness value are width values of the pre-tightening adjusting assembly along an expansion path of the battery cell array.

The pretension adjusting component is arranged in the battery pack, and is in a pretension state when in use, and the moving piece drives the first pretension plate and the second pretension plate to be far away from each other so that the pretension adjusting component obtains a maximum thickness value; before or after the battery cell array is placed on the battery box, the battery box is internally provided with the pre-tightening adjusting component, so that the pre-tightening adjusting component is positioned on the side face of the battery cell array and is positioned on an expansion path, a preset expansion gap is formed between two adjacent battery cells in the battery cell array, and the battery pack can normally perform charge and discharge work. When a certain battery monomer is used for a period of time, abnormal expansion occurs due to failure, and the expansion gap is filled, so that an excessive mutual extrusion force is generated between the battery monomers, and the problem of blocking of the battery monomers is solved. Therefore, in the follow-up maintenance operation, the invalid battery monomer is convenient to detach and replace, the whole battery pack is not replaced, the maintenance replacement cost of the battery is reduced, and meanwhile, the original intact battery monomer is not discarded, so that the resource waste is avoided, and the service cycle of the battery monomer is prolonged.

The technical scheme of the application is further described below:

in one embodiment, the moving member includes a moving rod and a moving portion disposed on the moving rod, a first moving matching portion is disposed on a side surface of the first pretensioning plate, which faces the moving member, a second moving matching portion corresponding to the first moving matching portion is disposed on a side surface of the second pretensioning plate, which faces the moving member, and the moving portion is connected with the first moving matching portion and the second moving matching portion, so that the first pretensioning plate and the second pretensioning plate are separated from each other and enter a pretensioning state.

In one embodiment, the actuating portion is configured as a thread segment, the first actuating portion includes a first surface and a first screwing thread formed on the first surface, the second actuating portion includes a second surface and a second screwing thread formed on the second surface, the first surface and the second surface form a cavity, and the thread segment extends into the cavity and is screwed with the first screwing thread and the second screwing thread.

In one embodiment, a first accommodating cavity is further formed in the side surface, facing the moving member, of the first pre-tightening plate, the first accommodating cavity is located at one end of the first moving matching portion, a second accommodating cavity corresponding to the first accommodating cavity is further formed in the side surface, facing the moving member, of the second pre-tightening plate, and the second accommodating cavity is located at one end of the second moving matching portion;

the depth of the first accommodating cavity is larger than that of the first surface, the depth of the second accommodating cavity is larger than that of the second surface, the depth direction is along the expansion path of the battery cell array, the actuating part is retracted into the first accommodating cavity and the second accommodating cavity from the first surface and the second surface, and the first pre-tightening plate and the second pre-tightening plate can be mutually close to each other so that the thickness of the pre-tightening adjusting assembly is reduced to enter a loosening state.

In one embodiment, the two moving parts are respectively located at two ends of the moving rod in the length direction, the two first moving matching parts are respectively located at two ends of the first accommodating concave cavity in the length direction, and the two second moving matching parts are respectively located at two ends of the second accommodating concave cavity in the length direction;

the first moving matching parts, the moving parts and the second moving matching parts are arranged in a one-to-one correspondence.

In one embodiment, the moving member further includes a screwing part provided at least one end of the moving rod, and the screwing part protrudes to the outside of the first and second pretensioning plates.

In one embodiment, the pretension adjusting assembly further comprises a guide rod, the first pretension plate is provided with a first guide hole, the second pretension plate is provided with a second guide hole corresponding to the first guide hole, and the guide rod penetrates through the first guide hole and the second guide hole.

In one embodiment, the guide rod is a bolt, the first guide hole is a countersunk hole, the second guide hole is a threaded hole, when the pre-tightening adjusting assembly is in a pre-tightening state, the bolt passes through the countersunk hole and is then screwed into the threaded hole, and the bolt head of the bolt is embedded in the countersunk hole; or alternatively

The guide rod is arranged to be a bolt, the second guide hole is arranged to be a countersunk hole, the first guide hole is arranged to be a threaded hole, when the pre-tightening adjusting assembly is in a pre-tightening state, the bolt passes through the countersunk hole and then is connected to the threaded hole in a threaded mode, and the bolt head of the bolt is embedded in the countersunk hole.

In another aspect, the present application also provides a battery pack, including:

a battery box;

the two baffles are arranged at two ends of the battery box in the length direction or the width direction at intervals, and two baffles and the battery box enclose an installation cavity, and a battery cell array is placed in the installation cavity; and

the pre-tightening adjusting assembly is arranged between the battery cell array and at least one baffle plate.

In addition, the application also provides an energy storage system, which comprises the battery pack.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model.

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a battery pack according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a side view of FIG. 1;

FIG. 3 is a schematic cross-sectional view of the structure at A-A in FIG. 2;

FIG. 4 is a schematic view of a partial enlarged structure at B in FIG. 3;

FIG. 5 is a schematic view of the pretension adjustment assembly of the present application in a pretension state;

FIG. 6 is a cross-sectional view of the pretension adjustment assembly of FIG. 5 in the width direction;

FIG. 7 is a cross-sectional view of the pretension adjustment assembly of FIG. 5 taken along the length thereof;

FIG. 8 is a schematic view of the pretension adjustment assembly of the present application in a released state;

FIG. 9 is a cross-sectional view of the pretension adjustment assembly of FIG. 8 in the width direction;

FIG. 10 is a cross-sectional view of the pretension adjustment assembly of FIG. 8 taken along the length thereof;

fig. 11 is an exploded view of the pretension adjustment assembly of fig. 5.

Reference numerals illustrate:

100. a battery pack; 10. a battery box; 20. a baffle; 30. an array of battery cells; 31. a battery cell; 40. a pretension adjustment assembly; 41. a first pre-tightening plate; 411. a first moving engagement portion; 412. a first receiving cavity; 413. a countersunk hole; 42. a second pre-tightening plate; 421. a second moving engagement portion; 422. a second receiving cavity; 423. a threaded hole; 43. an actuator; 431. an actuating rod; 432. an actuating part; 433. a twisting part; 44. a guide rod.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

The embodiment of the application provides an energy storage system, it includes energy storage cabinet, battery package 100, liquid cooling unit, high-voltage board etc. battery package 100, liquid cooling unit and high-voltage board are installed in the energy storage cabinet respectively. The liquid cooling unit and the high-voltage board are electrically connected to the battery pack 100, respectively.

As shown in fig. 1 to 4, the battery pack 100 illustratively includes: battery box 10, baffle 20, and pretension adjustment assembly 40. The battery case 10 adopts a tray structure with grooves thereon for loading the fixed battery cell array 30.

Further, two baffles 20 are provided, two baffles 20 are arranged at two ends of the battery box 10 in the length direction or the width direction at intervals, and two baffles 20 and the battery box 10 enclose a mounting cavity, and a battery cell array 30 is placed in the mounting cavity. Therefore, the baffles 20 arranged at the two ends can play a certain lateral limiting role on the battery cell array 30, and the battery cell array 30 is ensured to be stably placed.

It will be appreciated that the battery cell array 30 includes a plurality of battery cells 31, and the plurality of battery cells 31 are arranged in a lateral-longitudinal array configuration and electrically connected (e.g., in series and/or parallel) to each other. The volume of the mounting cavity, the capacity of the individual cells 31, and the number of cells 31, among other factors, determine the energy density and capacity of the battery pack 100 and the energy storage system. Alternatively, the battery cell 31 may be, but is not limited to, a prismatic battery, a cylindrical battery, or the like.

The pretension adjustment assembly 40 is disposed between the battery cell array 30 and the at least one baffle 20.

Specifically, as shown in fig. 4, a pretension adjustment assembly 40 is shown in an embodiment of the present application, and is configured to be mounted on a side of the battery cell array 30 and located in an expansion path of the battery cell array 30. So that the pre-tightening adjustment assembly 40 can be used to adjust the pre-tightening stress between the battery cells 31, thereby facilitating the removal of the target battery cell 31.

With continued reference to fig. 5 to 11, in the present embodiment, the pretension adjustment assembly 40 includes: a first pretensioning plate 41, a second pretensioning plate 42, and an actuator 43. The second pre-tightening plate 42 is arranged opposite to the first pre-tightening plate 41 at intervals; the actuator 43 is connected between the first pretensioning plate 41 and the second pretensioning plate 42, and the actuator 43 can drive the first pretensioning plate 41 and the second pretensioning plate 42 to approach or separate from each other.

Wherein, when the first pretensioning plate 41 and the second pretensioning plate 42 are at the maximum distance position, the pretensioning adjustment assembly 40 is in a pretensioning state and has the maximum thickness value; the battery cell array 30 is in the initial mounted state and the normal operating state at this time. When the first and second pretensioning plates 41 and 42 are in the minimum approach position, the pretensioning adjustment assembly 40 is in the undamped state with a minimum thickness value to account for abnormal expansion of individual or some of the failed battery cells 31. Specifically, the maximum thickness value and the minimum thickness value are the width values of the pretension adjustment assembly 40 along the expansion path of the battery cell array 30.

In summary, implementing the technical scheme of the embodiment has the following beneficial effects: when the pretension adjustment assembly 40 of the above-mentioned scheme is applied to the battery pack 100, the pretension adjustment assembly 40 is in a pretension state, and the first pretension plate 41 and the second pretension plate 42 are driven by the actuator 43 to be away from each other, so that the maximum thickness value of the pretension adjustment assembly 40 is obtained; before or after the battery cell array 30 is placed on the battery box 10, the pre-tightening adjusting assembly 40 is installed in the battery box 10, so that the pre-tightening adjusting assembly 40 is located on the side surface of the battery cell array 30 and is located on the expansion path, at this time, a preset expansion gap is formed between two adjacent battery cells 31 in the battery cell array 30, and the battery pack 100 can perform charging and discharging operations normally.

When a certain battery cell 31 is abnormally expanded due to failure and causes an excessive mutual extrusion force between the battery cells 31 after an expansion gap is filled and a clamping problem occurs, the first pretension plate 41 and the second pretension plate 42 are mutually close by operating the actuating member 43, so that the thickness of the pretension adjusting assembly 40 can be gradually reduced to a minimum thickness value in a release state, the thickness reduction value of the pretension adjusting assembly 40 is equivalent to the increase of the space required by the expansion of the battery cell array 30, namely, the effect of releasing the extrusion stress between the battery cells 31 is achieved, and the problem that the battery cells 31 are mutually clamped is solved. Therefore, in the subsequent maintenance operation, the invalid battery cell 31 is convenient to detach and replace, the whole battery pack 100 is not replaced, the maintenance replacement cost of the battery is reduced, meanwhile, the original intact battery cell 31 is not discarded, so that the resource waste is avoided, and the service cycle of the battery cell 31 is prolonged.

In this embodiment, the first pretensioning plate 41 and the second pretensioning plate 42 are rectangular plates with the same shape and size, and may be made of metal, resin, or the like.

With continued reference to fig. 5 to 7, and fig. 11, in some embodiments, the actuator 43 includes an actuator rod 431 and an actuator portion 432 disposed on the actuator rod 431, a first engaging portion 411 is disposed on a side of the first pretensioning plate 41 facing the actuator 43, a second engaging portion 421 corresponding to the first engaging portion 411 is disposed on a side of the second pretensioning plate 42 facing the actuator 43, and the actuator portion 432 is connected to the first engaging portion 411 and the second engaging portion 421, so that the first pretensioning plate 41 and the second pretensioning plate 42 are away from each other and enter a pretensioned state.

When the device is used, the driving actuating part 432 is connected with the first actuating matching part 411 and the second actuating matching part 421 at the same time, the first pretensioning plate 41 and the second pretensioning plate 42 can be pushed away in opposite directions by means of the size and the width of the actuating part 432, the purpose of adjusting and increasing the thickness of the pretensioning adjustment assembly 40 is achieved, and the pretensioning adjustment assembly 40 enters a pretensioning state.

Specifically, the actuating portion 432 is configured as a thread segment, the first actuating portion 411 includes a first surface and a first screwing thread formed on the first surface, the second actuating portion 421 includes a second surface and a second screwing thread formed on the second surface, the first surface and the second surface form a cavity, and the thread segment extends into the cavity and is screwed with the first screwing thread and the second screwing thread.

Therefore, the formed first surface and second surface can well accommodate the thread segments, so that the thread segments are screwed with the first screwing threads and the second screwing threads, the purpose of pushing the first pre-tightening plate 41 and the second pre-tightening plate 42 away can be achieved, and the positions of the first pre-tightening plate 41 and the second pre-tightening plate 42 in the pre-tightening state and the structural stability of the pre-tightening adjusting assembly 40 can be ensured. And the screw thread section is in screw connection with the first screw thread and the second screw thread by screwing the actuating rod 431, so that the operation mode of the screw thread adjusting structure is simple, labor-saving and efficient. Specifically, the first surface and the second surface are concave structures recessed in opposite directions.

It can be appreciated that the direction and size of the first and second screw threads need to be adapted and adapted to the thread segments to ensure proper screw assembly.

With continued reference to fig. 8 to 11, further, in any of the above embodiments, a side surface of the first pretensioning plate 41 facing the moving member 43 is further provided with a first accommodating cavity 412, the first accommodating cavity 412 is located at one end of the first moving mating portion 411, a side surface of the second pretensioning plate 42 facing the moving member 43 is further provided with a second accommodating cavity 422 corresponding to the first accommodating cavity 412, and the second accommodating cavity 422 is located at one end of the second moving mating portion 421.

The depth of the first receiving recess 412 is greater than that of the first surface, the depth of the second receiving recess 422 is greater than that of the second surface, the depth direction is the direction along the expansion path of the battery cell array 30, the actuating part 432 is retracted into the first receiving recess 412 and the second receiving recess 422 from the first surface and the second surface, and the first pretensioning plate 41 and the second pretensioning plate 42 can approach each other to reduce the thickness of the pretensioning adjustment assembly 40 to enter the released state.

In operation, when one or more of the battery cells 31 fail to work and expand abnormally, by screwing the actuating rod 431 in the opposite direction, the threaded section moves along the axial direction of the actuating rod 431 to be disconnected from the first screwing thread and the second screwing thread, and finally slides into the first accommodating cavity 412 and the second accommodating cavity 422, thereby unlocking the first pretensioning plate 41 and the second pretensioning plate 42.

Further, since the depths of the first receiving recess 412 and the second receiving recess 422 are greater than the depths of the corresponding first surface and second surface, respectively, a sufficient shrink gap is formed between the first pretensioning plate 41 and the second pretensioning plate 42, so that the first pretensioning plate 41 and the second pretensioning plate 42 can be moved toward each other, and the pretensioning adjustment assembly 40 is switched into the released state to be reduced in thickness. The reduced thickness value can make up the defect of expansion gap, so that the battery cells 31 can be loosened further to unload the extrusion stress, and even if the problem of abnormal expansion of the battery cells 31 exists, the problem that the extrusion stress between the battery cells 31 is too large to be blocked mutually, so that the battery cells cannot be taken out normally is avoided.

Preferably, two actuating portions 432 are provided on the basis of any one of the above embodiments and are respectively located at two ends of the actuating rod 431 in the length direction, two first actuating engaging portions 411 are provided and are respectively located at two ends of the first accommodating cavity 412 in the length direction, and two second actuating engaging portions 421 are provided and are respectively located at two ends of the second accommodating cavity 422 in the length direction; the first and second moving engagement portions 411 and 432 are provided in one-to-one correspondence with each other.

In this way, when the actuating rod 431 is screwed, the two sets of the first actuating engaging portion 411, the actuating portion 432 and the second actuating engaging portion 421 are engaged synchronously, so that a driving force is uniformly distributed to the first pre-tightening plate 41 and the second pre-tightening plate 42, so that the first pre-tightening plate 41 and the second pre-tightening plate 42 can approach or separate in a parallel manner, and expansion stress between the battery cells 31 is also uniformly released, so that the failed battery cells 31 can be removed and replaced more effectively and easily.

When one of the actuating portions 432 located at one end of the actuating rod 431 is located in the first receiving recess 412 and the second receiving recess 422, the other actuating portion 432 is moved to the outside of the first pre-tightening plate 41 and the second pre-tightening plate 42.

In order to facilitate the rotation of the screwing actuator 43 with less effort, the actuator 43 further includes a screwing part 433, the screwing part 433 is disposed at least one end of the actuating lever 431, and the screwing part 433 protrudes to the outside of the first and second pre-tightening plates 41 and 42.

For example, the screwing part 433 is provided in an outer hexagonal structure, which is convenient to be matched with the existing tools such as a wrench. Or the screwing part 433 is directly designed as a handle, so that the manual operation of a worker is convenient.

In addition, in still other embodiments, the pretension adjustment assembly 40 further includes a guide bar 44, the first pretension plate 41 is provided with a first guide hole, the second pretension plate 42 is provided with a second guide hole corresponding to the first guide hole, and the guide bar 44 is disposed through the first guide hole and the second guide hole. When the first and second pre-tightening plates 41 and 42 move toward or away from each other, the guide bar 44 plays a guiding and limiting role to ensure that the first and second pre-tightening plates 41 and 42 move in a parallel posture to each other, thereby helping to uniformly release the stress between the battery cells 31.

With continued reference to fig. 4 to 6, in the above embodiment, specifically, the guide rod 44 is configured as a bolt, the first guide hole is configured as a countersunk hole 413, the second guide hole is configured as a threaded hole 423, when the pretension adjusting assembly 40 is in the pretension state, the bolt passes through the countersunk hole 413 and is then screwed into the threaded hole 423, and the bolt head of the bolt is embedded in the countersunk hole 413. Alternatively, as an alternative to the above embodiment, the guide rod 44 is provided as a bolt, the second guide hole is provided as a countersunk hole 413, the first guide hole is provided as a threaded hole 423, when the pretension adjusting assembly 40 is in the pretension state, the bolt passes through the countersunk hole 413 and is then screwed into the threaded hole 423, and the bolt head of the bolt is embedded in the countersunk hole 413.

Taking the first guide hole as a counter bore 413, taking the second guide hole as a threaded hole 423 as an example, after the bolt is screwed and fixed with the threaded hole 423, the second pre-tightening plate 42 is fixed with the bolt, and the first pre-tightening plate 41 has a degree of freedom capable of moving close to or away from the second pre-tightening plate 42, that is, the requirement of switching between the pre-tightening state and the loosening state of the pre-tightening adjusting assembly 40 can be flexibly met under the pushing or releasing of the actuating member 43.

When the pre-tightening adjusting assembly 40 is in a loosening state, the bolt head of the bolt extends into the outside of the counter bore 413; when the pre-tightening adjusting assembly 40 is in a pre-tightening state, the bolt head is embedded into the counter bore 413, so that excessive installation space is prevented from being occupied.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Claims (10)

1. A pretension adjustment assembly for mounting on a side of a battery cell array and positioned in an expansion path of the battery cell array, the pretension adjustment assembly comprising:

a first pre-tightening plate;

the second pre-tightening plate is arranged opposite to the first pre-tightening plate at intervals; and

the moving part is connected between the first pre-tightening plate and the second pre-tightening plate and can drive the first pre-tightening plate and the second pre-tightening plate to be close to or far away from each other;

when the first pre-tightening plate and the second pre-tightening plate are at the maximum distance, the pre-tightening adjusting assembly is in a pre-tightening state and has the maximum thickness value; when the first pre-tightening plate and the second pre-tightening plate are at the minimum approaching position, the pre-tightening adjusting assembly is in a loosening state and has a minimum thickness value, and the maximum thickness value and the minimum thickness value are width values of the pre-tightening adjusting assembly along an expansion path of the battery cell array.

2. The pretension adjustment assembly according to claim 1, wherein the actuator includes an actuator lever and an actuator portion provided on the actuator lever, a first actuator engagement portion is provided on a side of the first pretension plate facing the actuator, a second actuator engagement portion corresponding to the first actuator engagement portion is provided on a side of the second pretension plate facing the actuator, and the actuator portion is connected to the first actuator engagement portion and the second actuator engagement portion so that the first pretension plate and the second pretension plate are away from each other and enter a pretension state.

3. The pretension adjustment assembly of claim 2, wherein the actuating portion is provided as a threaded section, the first actuating engagement portion includes a first surface and a first tightening thread formed on the first surface, the second actuating engagement portion includes a second surface and a second tightening thread formed on the second surface, the first surface and the second surface form a cavity, and the threaded section extends into the cavity and is in tightening engagement with the first tightening thread and the second tightening thread.

4. A pretensioning adjustment assembly according to claim 3 wherein the side of the first pretensioning plate facing the actuator is further provided with a first receiving recess at one end of the first actuator fitting portion, and the side of the second pretensioning plate facing the actuator is further provided with a second receiving recess corresponding to the first receiving recess at one end of the second actuator fitting portion;

the depth of the first accommodating cavity is larger than that of the first surface, the depth of the second accommodating cavity is larger than that of the second surface, the depth direction is along the expansion path of the battery cell array, the actuating part is retracted into the first accommodating cavity and the second accommodating cavity from the first surface and the second surface, and the first pre-tightening plate and the second pre-tightening plate can be mutually close to each other so that the thickness of the pre-tightening adjusting assembly is reduced to enter a loosening state.

5. The pretension adjustment assembly of claim 4, wherein the number of the moving parts is two and is located at both ends of the moving rod in the length direction, the number of the first moving matching parts is two and is located at both ends of the first accommodation cavity in the length direction, and the number of the second moving matching parts is two and is located at both ends of the second accommodation cavity in the length direction;

the first moving matching parts, the moving parts and the second moving matching parts are arranged in a one-to-one correspondence.

6. The pretension adjustment assembly of claim 2, wherein the actuator further includes a screw portion disposed at least one end of the actuator rod, and the screw portion extends outside of the first pretension plate and the second pretension plate.

7. The pretension adjustment assembly of claim 1, further comprising a guide bar, wherein the first pretension plate is provided with a first guide hole, wherein the second pretension plate is provided with a second guide hole corresponding to the first guide hole, and wherein the guide bar is disposed through the first guide hole and the second guide hole.

8. The pretension adjustment assembly of claim 7, wherein the guide bar is provided as a bolt, the first guide hole is provided as a counter bore, the second guide hole is provided as a threaded bore, the bolt is threaded into the threaded bore after passing through the counter bore when the pretension adjustment assembly is in a pretension state, and a bolt head of the bolt is embedded in the counter bore; or alternatively

The guide rod is arranged to be a bolt, the second guide hole is arranged to be a countersunk hole, the first guide hole is arranged to be a threaded hole, when the pre-tightening adjusting assembly is in a pre-tightening state, the bolt passes through the countersunk hole and then is connected to the threaded hole in a threaded mode, and the bolt head of the bolt is embedded in the countersunk hole.

9. A battery pack, comprising:

a battery box;

the two baffles are arranged at two ends of the battery box in the length direction or the width direction at intervals, and two baffles and the battery box enclose an installation cavity, and a battery cell array is placed in the installation cavity; and

a pre-tension adjustment assembly as recited in any one of claims 1 to 8, mounted between said array of cells and at least one of said baffles.

10. An energy storage system comprising the battery pack of claim 9.

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