Battery cell module with adjustable pre-tightening force and battery pack

Abstract

The utility model relates to the technical field of batteries, and particularly discloses a pre-tightening force adjustable battery cell module and a battery pack, the battery cell module comprises a first battery cell, a second battery cell and pre-tightening pieces, the first battery cell and the second battery cell are both provided with the pre-tightening pieces, the pre-tightening pieces are provided with first connecting parts and second connecting parts, and the first connecting parts and the second connecting parts are connected through the first connecting parts and the second connecting parts. The first connecting part of the pre-tightening piece positioned on the first battery cell can be clamped with the second connecting part of the pre-tightening piece positioned on the second battery cell, and the clamping position of the second connecting part on the first connecting part can be changed, so that the distance between the first battery cell and the second battery cell can be adjusted; according to the battery cell module, the distance between two adjacent battery cells can be adjusted through the two pre-tightening pieces, so that the pre-tightening force between the two battery cells can be adjusted, the pre-tightening force adjustment of a single battery cell is realized, the pre-tightening force of each battery cell can be accurately adjusted, each battery cell in the battery cell module can work in a preset pre-tightening force range, the working state of the battery cell module is ensured, and the battery cell module is convenient to use. Meanwhile, the service life of the battery cell is prevented from being influenced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of battery, especially a pre -tightening force adjustable electric core module and battery package. BACKGROUND

[0002] With the development of science and technology and the improvement of environmental protection consciousness, the application of electric vehicles, energy storage systems and other fields is more and more widely, and the battery technology as one of the core components in these fields has also developed rapidly. As the basic unit of the battery, the performance of the battery directly affects the efficiency of the whole battery system. In order to improve the stability and reliability of the battery system, higher requirements are put forward for the design of the battery module, especially the stacking of the battery in the forming process, which needs to provide pre-tightening force for the stacked battery to make it pre-tightening fixed and make it in a stable working state.

[0003] In the prior art, the soft package battery is generally stacked by directly contacting the battery with the battery, and a piece of foam is placed between the two batteries. Finally, pre-tightening force is applied to the opposite sides of the battery module. However, due to the multiple batteries in the whole module and the foam between the batteries for buffering, the pre-tightening force is continuously consumed during the transmission of the battery, and the middle battery does not feel the effect of the pre-tightening force. Moreover, the existing pre-tightening force is generally a fixed size, which will affect the pre-tightening force between the batteries when the battery expands and shrinks due to temperature changes or charging and discharging cycles, thereby affecting the working state and service life of the battery. SUMMARY

[0004] The utility model considers the foregoing problem and is made, the utility model aims at providing a pre -tightening force adjustable electric core module and battery package, it can adjust the pre -tightening force of each battery alone, make it can keep good working state, and can improve its service life.

[0005] To achieve the above object, the utility model provides a pre -tightening force adjustable electric core module, including first battery, second battery and pre -tightening piece, the first battery and the second battery are stacked to form the electric core module, and the first battery and the second battery are provided with the pre -tightening piece;

[0006] The first connecting part and the second connecting part are arranged on the pre-tightening piece, the first connecting part of the pre-tightening piece on the first battery can be clamped with the second connecting part of the pre-tightening piece on the second battery, and the clamping position of the second connecting part and the first connecting part can be changed to adjust the distance between the first battery and the second battery.

[0007] The pre-tightening force adjustable battery cell module further comprises a third battery cell, which is located on the side of the second battery cell away from the first battery cell, and the third battery cell is also provided with the pre-tightening piece, and the first connecting part of the pre-tightening piece on the second battery cell can be clamped with the second connecting part of the pre-tightening piece on the third battery cell.

[0008] The pre-tightening force adjustable battery cell module further comprises a foam, which is installed between the adjacent first battery cell and second battery cell and between the second battery cell and third battery cell.

[0009] The pre-tightening force adjustable battery cell module further comprises a third battery cell, which is located on the side of the second battery cell away from the first battery cell, and the third battery cell is also provided with the pre-tightening piece, and the first connecting part of the pre-tightening piece on the second battery cell can be clamped with the second connecting part of the pre-tightening piece on the third battery cell.

[0010] The pre-tightening force adjustable battery cell module further comprises a third battery cell, which is located on the side of the second battery cell away from the first battery cell, and the third battery cell is also provided with the pre-tightening piece, and the first connecting part of the pre-tightening piece on the second battery cell can be clamped with the second connecting part of the pre-tightening piece on the third battery cell.

[0011] The pre-tightening force adjustable battery cell module further comprises a third battery cell, which is located on the side of the second battery cell away from the first battery cell, and the third battery cell is also provided with the pre-tightening piece, and the first connecting part of the pre-tightening piece on the second battery cell can be clamped with the second connecting part of the pre-tightening piece on the third battery cell.

[0012] The pre-tightening force adjustable battery cell module further comprises a third battery cell, which is located on the side of the second battery cell away from the first battery cell, and the third battery cell is also provided with the pre-tightening piece, and the first connecting part of the pre-tightening piece on the second battery cell can be clamped with the second connecting part of the pre-tightening piece on the third battery cell.

[0013] The pre-tightening force adjustable battery cell module further comprises a third battery cell, which is located on the side of the second battery cell away from the first battery cell, and the third battery cell is also provided with the pre-tightening piece, and the first connecting part of the pre-tightening piece on the second battery cell can be clamped with the second connecting part of the pre-tightening piece on the third battery cell.

[0014] The pre-tightening force adjustable battery cell module further comprises a third battery cell, which is located on the side of the second battery cell away from the first battery cell, and the third battery cell is also provided with the pre-tightening piece, and the first connecting part of the pre-tightening piece on the second battery cell can be clamped with the second connecting part of the pre-tightening piece on the third battery cell.

[0015] The positioning recess is a positioning groove, a plurality of the positioning grooves are arranged on the connecting rod at intervals, the positioning protrusion is a positioning block, the positioning block protrudes from the inside of the joint, the connecting rod can be inserted into the joint, and the positioning block can extend into the positioning groove.

[0016] The pre-tightening force adjustable battery cell module further comprises heat dissipation aluminum sheets, which are wrapped on the outer sides of the first battery cell and the second battery cell.

[0017] A battery pack comprises:

[0018] A housing is internally provided with a containing cavity.

[0019] The battery cell modules as described above are all located in the containing cavity.

[0020] The utility model has the following beneficial effects:

[0021] 1. The distance between two adjacent battery cells can be adjusted by two pre-tightening members, thereby the pre-tightening force between the two battery cells can be adjusted, the pre-tightening force adjustment of a single battery cell is realized, and the pre-tightening force of each battery cell can be accurately adjusted, so that each battery cell in the battery cell module works within a preset pre-tightening force range, the working state is ensured, and the service life of the battery cell is avoided from being affected;

[0022] 2. The heat dissipation aluminum sheets are wrapped on the outer sides of the first battery cell and the second battery cell, the heat dissipation aluminum sheets can realize the rapid heat dissipation of the first battery cell and the second battery cell, and the heat dissipation performance is improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is an overall structure schematic view of the battery cell module of the embodiment;

[0024] Figure 2 It is an explosion structure schematic view of the first battery cell, the pre-tightening member, the foam and the heat dissipation aluminum sheet of the first embodiment;

[0025] Figure 3 It is a partial sectional view of the pre-tightening member of the first embodiment;

[0026] Figure 4 It is a partial sectional view of the pre-tightening member of the second embodiment.

[0027] In the drawings:

[0028] 100, first cell; 200, second cell; 300, pressing strip; 310, clamping tape; 311, clamping tooth; 311a, locking straight surface; 311b, guiding inclined surface; 320, clamping buckle; 321, barb; 330, connecting rod; 331, positioning groove; 340, joint; 341, positioning block; 400, foam; 500, heat dissipation aluminum sheet; 600, third cell. DETAILED DESCRIPTION

[0029] The following is a specific embodiment of the utility model and in combination with the drawings, the technical scheme of the utility model is further described, but the utility model is not limited to these embodiments.

[0030] Embodiment one

[0031] As Figures 1-3 shown, a battery pack includes a shell and a cell module, the shell is provided with a containing cavity, and a plurality of cell modules are located in the containing cavity to form a complete battery pack, wherein the pre-tightening force of the cell module is adjustable.

[0032] Specifically, a pre-tightening force adjustable cell module includes a first cell 100, a second cell 200 and a pre-tightening piece, wherein the first cell 100 and the second cell 200 are stacked to form the cell module, and the first cell 100 and the second cell 200 are both provided with the pre-tightening piece, so that the first cell 100 and the second cell 200 correspond to one pre-tightening piece respectively, and adjacent first cells 100 and second cells 200 are connected by two adjacent pre-tightening pieces and the pre-tightening force between them is adjusted, thereby realizing the independent adjustment of the pre-tightening force of the first cell 100 and the second cell 200, which is conducive to controlling the pre-tightening force of each cell in the cell module, so that each cell can work in a suitable pre-tightening force state, improve the working state, and also improve the service life.

[0033] In this embodiment, the first connecting part and the second connecting part are provided on the pre-tightening piece, the first connecting part of the pre-tightening piece located on the first cell 100 can be clamped with the second connecting part of the pre-tightening piece located on the second cell 200, that is, the connection of two adjacent pre-tightening pieces can be realized by clamping, thereby realizing the connection between adjacent first cells 100 and second cells 200, and the distance between the first cell 100 and the second cell 200 can be determined by clamping, thereby determining the pre-tightening force between them, and in order to realize the adjustment of the pre-tightening force, the clamping position of the second connecting part and the first connecting part can change, and when the clamping position changes, the distance between the first cell 100 and the second cell 200 can be adjusted, and the adjustment of the distance can realize the adjustment of the pre-tightening force.

[0034] In the embodiment, the number of the battery cells in the battery cell module is not limited to two, and the battery cell module further includes a third battery cell 600 located on the side of the second battery cell 200 away from the first battery cell 100, and the third battery cell 600 is also provided with a pre-tightening piece. The first connecting part of the pre-tightening piece on the second battery cell 200 can be clamped with the second connecting part of the pre-tightening piece on the third battery cell 600. Similarly, the third battery cell 600 is arranged on the side of the second battery cell 200 along the stacking direction of the first battery cell 100 and the second battery cell 200, and is connected with the second battery cell 200 through the first connecting part and the second connecting part of the two pre-tightening pieces. After the plurality of battery cells are stacked, the second connecting part of the pre-tightening piece on the previous battery cell is inserted into the first connecting part of the pre-tightening piece on the next battery cell, and the connection is achieved. The connection between the plurality of battery cells is realized, and the pre-tightening force is provided, and the pre-tightening force is adjustable.

[0035] Of course, in the embodiment, the battery cell module only includes the first battery cell 100, the second battery cell 200 and the third battery cell 600, but the number of battery cells in the battery cell module can be set according to the capacity requirement of the battery and the size of the cavity in the shell. The fourth battery cell and the fifth battery cell can also be provided, and the number thereof should not be limited.

[0036] In order to realize the absorption of the deformation amount of the battery cell, the foam 400 is also included, which is installed between the adjacent first battery cell 100 and the second battery cell 200, and between the second battery cell 200 and the third battery cell 600. That is, the foam 400 is provided between any two adjacent battery cells. When the first battery cell 100 or the second battery cell 200 or the third battery cell 600 expands due to the use condition, it can extrude the foam 400, and the foam 400 can absorb the deformation amount.

[0037] Specifically, in the embodiment, the first battery cell 100 and the second battery cell 200 are both provided with a mounting side, and the mounting sides of the plurality of battery cells are located on the same side of the battery cell module, which is beneficial to the installation and connection of the pre-tightening pieces between the battery cells.

[0038] Specifically, the pre-tightening piece is provided as a pressing strip 300, and a plurality of pressing strips 300 are respectively installed on the mounting sides of the plurality of battery cells. In the embodiment, the pressing strips 300 are located on the same side of the first battery cell 100 and the second battery cell 200, that is, on the mounting side thereof. Among them, the first battery cell 100 and the second battery cell 200 are stacked in the first direction, and the first connecting part and the second connecting part are arranged on the same end of the pressing strip 300 in the first direction, that is, the connection direction between the pre-tightening pieces is consistent with the stacking direction of the battery cells, which is beneficial to the connection of the adjacent battery cells through the pre-tightening pieces.

[0039] The first direction can be vertical downward or vertical upward, or horizontal backward or horizontal forward, and the specific direction is not limited.

[0040] In order to realize the clamping of the first connecting part and the second connecting part, at least two positioning recesses are arranged on the first connecting part, and a positioning protrusion is arranged on the second connecting part, the positioning protrusion can extend into the positioning recess to realize the clamping of the first connecting part and the second connecting part, and the positioning protrusion can move into the adjacent positioning recess, and the distance between the two adjacent battery cells can be adjusted by changing the clamping position.

[0041] In the embodiment, the first connecting part is a clamping strip 310, the second connecting part is a clamping buckle 320, the clamping strip 310 and the clamping buckle 320 are arranged at the upper end of the pressing strip 300 along the first direction, then the clamping strip 310 of the first pressing strip 300 can extend into the clamping buckle 320 of the second pressing strip 300, so as to realize the connection of the two adjacent pressing strips 300, wherein the positioning recess is a clamping tooth 311, and a plurality of clamping teeth 311 are arranged on one side of the clamping strip 310 along the first direction, the positioning protrusion is a barb 321, and the barb 321 protrudes from the inner side of the clamping buckle 320, then when the clamping strip 310 extends into the clamping buckle 320, the barb 321 can extend into the clamping tooth 311 and be clamped with the clamping tooth 311, and since the clamping teeth 311 are arranged along the first direction, the clamping strip 310 can also continue to move along the first direction to adjust the clamping of the barb 321 with different clamping teeth 311, so as to adjust the position of the clamping strip 310 and the position between the two battery cells, and realize the adjustment of the pre-tightening force.

[0042] In order to avoid the pre-tightening force being invalid due to the mutual extrusion of the battery cells, a locking straight surface 311a and a guide inclined surface 311b are arranged in the clamping tooth 311, in the embodiment, the direction opposite to the first direction is named as the second direction, when the clamping strip 310 moves along the first direction, the barb 321 can move along the guide inclined surface 311b into the adjacent clamping tooth 311, when the clamping strip 310 moves along the direction opposite to the first direction, i.e. along the second direction, the barb 321 can abut against the locking straight surface 311a, at this time, the clamping strip 310 can be locked, then it is limited that the clamping strip 310 can only move relative to the clamping buckle 320 along the first direction in the normal state, and the clamping buckle 320 can only move relative to the clamping strip 310 along the second direction, so as to ensure that the clamping strip 310 will not move away from the clamping buckle 320 along the second direction under the action of the expansion of the battery cells, and further ensure that the overall pre-tightening force will not be invalid.

[0043] In particular, when the pre-tightening force between the two battery cells is reduced, the clamping strip 310 needs to be pushed to the side away from the barb 321, so that the barb 321 is separated from the clamping tooth 311, and then the clamping strip 310 is moved.

[0044] In order to improve the heat dissipation capacity of each battery cell, a heat dissipation aluminum sheet 500 is further included, which can be wrapped on the outer side of the first battery cell 100 and the second battery cell 200, that is, the heat dissipation aluminum sheet 500 is wrapped on the other three sides of the first battery cell 100 except the mounting side, or wrapped on the other three sides of the second battery cell 200 except the mounting side, so that the first battery cell 100 and the second battery cell 200 can be simultaneously cooled on multiple sides, and the heat dissipation effect is improved.

[0045] Embodiment two

[0046] As Figure 1 With Figure 4 As shown in the embodiment, the first connecting part is a connecting rod 330, the second connecting part is a joint 340, the connecting rod 330 and the joint 340 are arranged at the upper end of the pressing strip 300 along the first direction, the positioning recess is a positioning groove 331, a plurality of positioning grooves 331 are arranged on the connecting rod 330, the positioning protrusion is a positioning block 341, the positioning block 341 protrudes from the inside of the joint 340, the connecting rod 330 can be inserted into the joint 340, and the positioning block 341 can extend into the positioning groove 331, that is, in the embodiment, the cooperation mode of the barb and the tooth is not used, but the cooperation mode of the positioning block 341 and the positioning groove 331 is used for clamping, which is similar to gear adjustment, and the clamping between the two pre-tightening members can also be achieved.

[0047] Of course, in addition to the above two clamping modes, other clamping modes can also be used, as long as they do not exceed the scope of the application.

[0048] The technical solutions of the utility model are described in detail above in combination with the drawings, and the described embodiments are used to help understand the idea of the utility model. The specific embodiments described in this paper are only examples of the spirit of the utility model. Those skilled in the art to which the utility model belongs can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the utility model or exceed the scope defined by the appended claims.

[0049] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain posture (as shown in the drawings), if the certain posture changes, the directional indications will also change accordingly.

[0050] In addition, the descriptions such as "first", "second", "one" and the like in the present application are only for the purpose of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0051] In the present application, unless otherwise specifically defined and limited, the terms "connection", "fixing" and the like should be broadly understood, for example, "fixing" can be fixed connection, or detachable connection, or integrated; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0052] In addition, the technical solutions of each embodiment of the present application can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, nor is it within the protection scope required by the present application.

Claims

1. A pre-tightening force adjustable battery cell module, characterized by, The first electric core, the second electric core and the pre-tightening part are included, the first electric core and the second electric core are stacked to form the electric core module, and the pre-tightening part is arranged on the first electric core and the second electric core; The first connecting part and the second connecting part are arranged on the pre-tightening part, the first connecting part of the pre-tightening part arranged on the first electric core can be clamped with the second connecting part of the pre-tightening part arranged on the second electric core, and the clamping position of the second connecting part and the first connecting part can be changed to adjust the distance between the first electric core and the second electric core.

2. The electric cell module with adjustable pre-tightening force according to claim 1, characterized in that, The third electric core is further included, the third electric core is arranged on the side of the second electric core away from the first electric core, and the pre-tightening part is arranged on the third electric core.

3. The pre-tightening adjustable battery cell module of claim 2, wherein, The foam is further included, and the foam is arranged between the adjacent first electric core and second electric core and the second electric core and the third electric core.

4. The pre-load adjustable battery cell module of claim 1, wherein, The pre-tightening part is arranged as a pressing strip, the pressing strip is arranged on the same side of the first electric core and the second electric core, the first electric core and the second electric core are stacked in a first direction, and the first connecting part and the second connecting part are arranged on the same end of the pressing strip in the first direction.

5. The pre-load adjustable battery cell module of claim 4, wherein, The first connecting part is arranged as a clamping belt, the second connecting part is arranged as a clasp, and the clamping belt and the clasp are arranged on the upper end of the pressing strip in the first direction.

6. The pre-load adjustable battery cell module of claim 5, wherein, The first connecting part is arranged as a clamping belt, the second connecting part is arranged as a clasp, and the clamping belt and the clasp are arranged on the upper end of the pressing strip in the first direction. The first connecting part is arranged as a clamping belt, the second connecting part is arranged as a clasp, and the clamping belt and the clasp are arranged on the upper end of the pressing strip in the first direction.

7. The pre-load adjustable battery cell module of claim 6, wherein, The first connecting part is arranged as a clamping belt, the second connecting part is arranged as a clasp, and the clamping belt and the clasp are arranged on the upper end of the pressing strip in the first direction.

8. The pre-load adjustable battery cell module of claim 5, wherein, The first connecting part is arranged as a clamping belt, the second connecting part is arranged as a clasp, and the clamping belt and the clasp are arranged on the upper end of the pressing strip in the first direction. The first connecting part is arranged as a clamping belt, the second connecting part is arranged as a clasp, and the clamping belt and the clasp are arranged on the upper end of the pressing strip in the first direction.

9. The pre-load adjustable battery cell module of claim 1, wherein, The first connecting part is arranged as a clamping belt, the second connecting part is arranged as a clasp, and the clamping belt and the clasp are arranged on the upper end of the pressing strip in the first direction.

10. A battery pack, characterized by, The first connecting part is arranged as a clamping belt, the second connecting part is arranged as a clasp, and the clamping belt and the clasp are arranged on the upper end of the pressing strip in the first direction. The first connecting part is arranged as a clamping belt, the second connecting part is arranged as a clasp, and the clamping belt and the clasp are arranged on the upper end of the pressing strip in the first direction. The first connecting part is arranged as a clamping belt, the second connecting part is arranged as a clasp, and the clamping belt and the clasp are arranged on the upper end of the pressing strip in the first direction. The first connecting part is arranged as a clamping belt, the second connecting part is arranged as a clasp, and the clamping belt and the clasp are arranged on the upper end of the pressing strip in the first direction. The first connecting part is arranged as a clamping belt, the second connecting part is arranged as a clasp, and the clamping belt and the clasp are arranged on the upper end of the pressing strip in the first direction. The first connecting part is arranged as a clamping belt, the second connecting part is arranged as a clasp, and the clamping belt and the clasp are arranged on the upper end of the pressing strip in the first direction. The first connecting part is arranged as a clamping belt, the second connecting part is arranged as a clasp, and the clamping belt and the clasp are arranged on the upper end of the pressing strip in the first direction. The first connecting part is arranged as a clamping belt, the second connecting part is arranged as a clasp, and the clamping belt and the clasp are arranged on the upper end of the pressing strip in the first direction. The first connecting part is arranged as a clamping belt, the second connecting part is arranged as a clasp, and the clamping belt and the clasp are arranged on the upper end of the pressing strip in the first direction. The first connecting part is arranged as a clamping belt, the second connecting part is arranged as a clasp, and the clamping belt and the clasp are arranged on the upper end of the pressing strip in the first direction. The first connecting part is arranged as a clamping belt, the second connecting part is arranged as a clasp, and the clamping belt and the clasp are arranged on the upper end of the pressing strip in the first direction. The first connecting part is arranged as a clamping belt, the second connecting part is arranged as a clasp, and the clamping belt and the clasp are arranged on the upper end of the pressing strip in the first direction. 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The first connecting part is arranged as a clamping belt, the second connecting part is arranged as a clasp, and the clamping belt and the clasp are arranged on the upper end of the pressing strip in the first direction. The first connecting part is arranged as a clamping belt, the second connecting part is arranged as a clasp, and the clamping belt and the clasp are arranged on the upper end of the pressing strip in the first direction. The first connecting part is arranged as a clamping belt, the second connecting part is arranged as a clasp, and the clamping belt and the clasp are arranged on the upper end of the pressing strip in the first direction. The first connecting part is arranged as a clamping belt, the second connecting part is arranged as a clasp, and the clamping belt and the clasp are arranged on the upper end of the pressing strip in the first direction. The first connecting part is arranged as a clamping belt, the second connecting part is arranged as a clasp, and the clamping belt and the clasp are arranged on the upper end of the pressing strip in the first direction. The first connecting part is arranged as a clamping belt, the second connecting part is arranged as a clasp, and the clamping belt and the clasp are arranged on the upper end of the pressing strip in the first direction. The first connecting part is arranged as a clamping belt, the second connecting part is arranged as a clasp, and the clamping belt and the clasp are arranged on the upper end of the pressing strip in the first direction. The first connecting part is arranged as a clamping belt, the second connecting part is arranged as a clasp, and the clamping belt and the clasp are arranged on the upper end of the pressing strip in the first direction. The first connecting part is arranged as a clamping belt, the second connecting part is arranged as a clasp, and the clamping belt and the clasp are arranged on the upper end of the pressing strip in the first direction. The first connecting part is arranged as a clamping belt, the second connecting part is arranged as a clasp, and the clamping belt and the clasp are arranged on the upper end of the pressing strip in the first direction. The first connecting part is arranged as a clamping

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