Soft package battery module and battery pack

Abstract

The utility model relates to the technical field of lithium ion batteries, in particular to a soft package battery module and a battery pack. The soft package battery module comprises a battery cell group, a bus board is arranged at the top of the battery cell group, the bus board is electrically connected with the battery cell group, a fixing part is arranged on the bus board, a cover plate is arranged on the fixing part, a cavity is formed between the cover plate and the bus board, the cavity is filled with heat-conducting pouring sealant, and the heat-conducting pouring sealant is arranged in the cavity. And a battery protection plate is detachably mounted on the cover plate. The cavity is reserved between the confluence plate and the cover plate, the confluence plate and the cover plate are relatively fixed, the cover plate and the confluence plate are prevented from generating relative displacement in a vibration environment for a long time, a tab and a sampling wire harness above the confluence plate are prevented from being abraded, a heat conduction pouring sealant can be poured into the cavity subsequently, and the solidified colloid can buffer the limiting pressure in the soft package battery module, so that the reliability of the soft package battery module is improved. And the overall durability of the soft package battery module is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of lithium ion battery, concretely relates to a soft package battery module and battery package. BACKGROUND

[0002] With the continuous development of lithium battery industry, in the battery structure aspect, soft package battery has the advantages such as flexible processing performance, good energy density characteristics, so that soft package battery is widely applied in lithium battery industry. The structure of soft package battery module plays a supporting, fixing and protecting role for soft package battery, and the battery protection plate is the core component of the battery management system, which monitors important parameters such as the charge and discharge state, voltage, current and temperature of the battery to ensure the safe and stable operation of the battery. Whether the fixing mode of the soft package battery module and the battery protection plate in the battery package is reliable has a direct relationship with the safety and stability and service life of the battery package. Before the soft package battery module is assembled into the battery package, the battery protection plate is separated from the soft package battery module by an insulating cover plate: the battery protection plate is placed above the insulating cover plate, and the soft package battery module busbar structure is attached below the insulating cover plate. The limiting of the soft package battery module and the battery protection plate in the battery package has been a big trouble in the industry. At present, the mainstream way in the industry is to place foam between the box cover of the battery package and the insulating cover plate and the battery protection plate, and to limit by pressing down the box cover. This way has the following problems: first, the insulating cover plate is attached to the soft package battery module busbar structure on one side, which is prone to wear the positive lug and sampling wire harness above the busbar structure in a long-term vibration environment, resulting in failure. Second, the battery protection plate is vertically subjected to limiting pressure for a long time, which is prone to quality problems. SUMMARY

[0003] To solve the problems in the background art, the utility model provides a soft package battery module and battery package, which can prolong the service life of the busbar and the battery protection plate in a vibration environment.

[0004] To achieve the above purpose, the utility model provides a soft package battery module, which comprises a battery cell group, a busbar is arranged on the top of the battery cell group, the busbar is electrically connected with the battery cell group, a fixing piece is arranged on the busbar, a cover plate is arranged on the fixing piece, a cavity is formed between the cover plate and the busbar, heat-conducting pouring sealant is filled in the cavity, and a battery protection plate is detachably mounted on the cover plate.

[0005] Further, a terminal post is arranged on the busbar, and the height of the cavity is higher than the height of the terminal post.

[0006] Further, the fixing piece is a threaded stud.

[0007] Further, a spill-proof piece is arranged around the cavity.

[0008] Further, the anti-overflow member is a fiberglass tape.

[0009] Further, the cover plate is provided with a filling hole in communication with the cavity.

[0010] Further, the cell group is provided with a tab, the busbar is provided with a through hole, and a nickel sheet area is further arranged on the periphery of the through hole; the tab is arranged through the through hole, the tab is provided with a hook-shaped portion, a copper bar is inserted between the hook-shaped portion and the busbar, the upper and lower ends of the copper bar are respectively in abutment with the hook-shaped portion and the nickel sheet area, and the copper bar is electrically connected with the busbar through the nickel sheet area.

[0011] The utility model discloses a kind of battery packs, including shell, the shell includes box and box cover, the box is mounted with the soft package battery module of any one described above in the above, the cover plate is provided with a limiting part between the box cover, the upper and lower ends of the limiting part are respectively in abutment with box cover inner wall, cover plate.

[0012] Further, the limiting part is a foam.

[0013] Further, the box and the soft package battery module are provided with a buffer

[0014] Compared with prior art, the utility model has the advantages that: by reserving cavity between busbar and cover plate, and making busbar and cover plate relatively fixed, prevent relative displacement of cover plate and busbar in vibration environment for a long time, wear busbar upper tab, sampling wire harness, the cavity can also pour into heat-conducting potting adhesive subsequently, and the solidified colloid can buffer internal limiting pressure of soft package battery module, increase the overall durability of soft package battery module. BRIEF DESCRIPTION OF DRAWINGS

[0015] Preferred embodiments of the utility model will be described below with reference to the drawings, wherein:

[0016] Figure 1 It is the structure schematic view of soft package battery module provided by the embodiment;

[0017] Figure 2 It is the appearance schematic view of soft package battery module provided by the embodiment;

[0018] Figure 3 It is the schematic view of heat-conducting potting adhesive provided by the embodiment;

[0019] Figure 4 It is the schematic view of busbar provided by the embodiment;

[0020] Figure 5 It is the schematic view of cover plate provided by the embodiment;

[0021] Figure 6 is a schematic view of a battery protection plate provided by the embodiment;

[0022] Figure 7 is a schematic view of a limiting piece when not stressed provided by the embodiment;

[0023] Figure 8 is Figure 4 is a partial enlarged schematic view at A in FIG. 8.

[0024] A list of reference signs is shown in the attached list of reference signs.

[0025] 1, cell group; 11, soft package cell; 12, tab;

[0026] 2, busbar; 21, fixing piece; 22, sampling wire harness and interface thereof; 23, copper bar; 25, cavity;

[0027] 3, cover plate; 31, filling hole; 32, clamping column;

[0028] 4, battery protection plate; 41, clamping interface;

[0029] 5, limiting piece;

[0030] 8, heat-conducting filling adhesive;

[0031] 9, shell; 91, box body; 92, box cover. DETAILED DESCRIPTION

[0032] The accompanying drawings are only used for illustrative description and cannot be understood as limiting the utility model; it should be clear that the described embodiments are only some of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model embodiments, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model embodiments.

[0033] The terms used in the utility model embodiments are only for the purpose of describing specific embodiments, and are not intended to limit the utility model embodiments. The singular forms "a", "said" and "the" used in the utility model embodiments and the appended claims are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein means and includes any or all possible combinations of one or more associated listed items.

[0034] The following description refers to the accompanying drawings. Unless otherwise indicated, same or similar elements in different drawings are denoted by the same reference numerals. The following description of the example embodiments is not meant to represent all embodiments in accordance with the present application. Rather, it is merely intended to describe some aspects of devices and methods in accordance with the present application as detailed in the appended claims. In the description of the present application, it is to be understood that the terms "first", "second", "third", etc., are merely used to differentiate similar objects, and do not necessarily mean a specific order or sequence, nor can they be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0035] In addition, in the description of the present application, "multiple" means two or more, unless otherwise specified. The association between the associated objects described by "and / or" means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects. The present application is further described below in conjunction with the drawings and examples.

[0036] The present application is further described below in conjunction with the drawings and examples.

[0037] As Figures 1-8As shown, the embodiment discloses a soft package battery module, which comprises a battery cell group 1, the battery cell group 1 comprises two or more soft package battery cells 11, the soft package battery cells 11 are stacked in the battery cell group 1 in a side-by-side or matrix manner, the soft package battery cells 11 are arranged in series or in parallel, the adjacent soft package battery cells 11 are separated by a PC film with a thickness of 0.3 mm, and a plurality of tabs 12 extend out of the battery cell group 1. A busbar 2 is arranged on the top of the battery cell group 1, the busbar 2 is provided with a through hole corresponding to the position of the tab 12 on the battery cell group 1, the end of the tab 12 is a hook-shaped part in the shape of inverted L, a nickel sheet area is further arranged on the busbar 2 around the through hole, and the nickel sheet area is electrically connected with the internal circuit of the busbar 2; the tab 12 passes through the through hole and then the end is bent to form a hook-shaped part, a copper bar 23 is inserted between the hook-shaped part of the tab 12 and the busbar 2, the copper bar 23 is in the shape of a long strip, the lower surface of the two ends of the copper bar 23 is in contact with the nickel sheet area of the busbar 2, and the upper surface of the middle part of the copper bar 23 is in contact with the lower surface of the hook-shaped part of the tab 12, so that the battery cell group 1 and the busbar 2 are electrically connected, and the current can pass through the tab 12, the copper bar 23 and the nickel sheet area to finally reach the busbar 2. The busbar 2 is further provided with a sampling wire harness and an interface 22 thereof, the interface is in communication with the nickel sheet area and communicates with other components of the module through the sampling wire harness. The top of the battery cell group 1 is filled with foam, the top of the foam abuts against the bottom of the busbar 2, the foam can fill the gap between the battery cell group 1 and the busbar 2, and an opposite force is applied to the busbar 2 and the battery cell group 1, so that the tab 12 is more closely connected with the busbar 2. In this way, the busbar 2 is directly used as a PCB, and the busbar 2 and the tab 12 do not need to be welded, thereby avoiding the heat generated by welding and burning the busbar.

[0038] A cover plate 3 is arranged on the busbar 2, and a battery protection plate 4 is fixedly arranged on the cover plate 3, and the cover plate 3 and the battery protection plate 4 can be connected in a manner of pasting, clamping, riveting, welding or screwing; in order to facilitate installation, the embodiment adopts a clamping mode, that is, a plurality of clamping columns 32 are arranged on the upper surface of the cover plate 3, and a clamping interface 41 matched with the clamping columns 32 is arranged below the battery protection plate 4; during installation, the clamping interface 41 is only needed to be aligned with the clamping columns 32 on the cover plate 3 and then pressed down, so that the battery protection plate 4 is fixed on the cover plate 3.

[0039] In order to prevent the tabs 12 above the busbar 2 and the sampling wire harness from being easily worn in a long-term vibration environment, a protective cover 5 is arranged on the busbar 2, the protective cover 5 is in the shape of a long strip, and the protective cover 5 is arranged on the busbar 2 in a manner of clamping, pasting, riveting, welding or screwing. Figure 1 3 ​As shown in FIGS. 4, the fixing member 21 is arranged on the busbar plate 2, the fixing member 21 is fixedly connected with the cover plate 3, so that the cavity 25 is formed between the cover plate 3 and the busbar plate 2, and the heat-conducting pouring sealant 8 is poured in the cavity 25. The fixing member 21 needs to have a certain height, so that the cavity 25 with a certain height is formed between the busbar plate 2 and the cover plate 3, the components on the busbar plate 2 are separated from the cover plate 3, direct contact between the cover plate 3 and the components on the busbar plate 2 is avoided, and space for pouring the heat-conducting pouring sealant 8 is provided. The fixing member 21 is fixedly connected with the cover plate 3 and the busbar plate 2, when affected by external forces such as vibration and extrusion, the cover plate 3 is fixed at a certain height relative to the busbar plate 2 by the fixing member 21, relative displacement between the cover plate 3 and the busbar plate 2 is avoided, wear of the tab 12 above the busbar plate 2 and the sampling wire harness is avoided, and the components on the cover plate 3 and the busbar plate 2 are protected. The heat-conducting pouring sealant 8 poured in the cavity 25 between the busbar plate 2 and the cover plate 3 can buffer the internal limiting pressure of the battery pack (the tab 12 of the soft-pack battery cell 11 and the busbar plate 2) after solidification of the heat-conducting pouring sealant 8, the overall durability of the battery pack is increased, and stress failure is avoided. In addition, the heat-conducting pouring sealant 8 can also play a role in heat dissipation, waterproofing and dustproofing after solidification, so as to ensure the stability and safety of the soft-pack battery module under various environmental conditions.

[0040] In a possible embodiment, in order to protect the components on the cover plate 3 and the busbar plate 2 while making the volume of the soft-pack battery module as small as possible, the height of the cavity 25 needs to take both of the above conditions into account, so the height of the cavity 25 is preferably limited to 8mm. The 8mm-high cavity 25 can just avoid the height of the tab 12 and the required sampling wire harness, especially the wiring post above the busbar plate 2, so that the components on the cover plate 3 and the busbar plate 2 are protected while the volume of the cavity 25 is as small as possible. It should be noted that the preferred height of the cavity 25 in the embodiment is 8mm, but the height of the cavity 25 in the utility model is not limited to 8mm. If there is a need for other manufacturing processes, the height of the cavity 25 will also change according to the process requirements.

[0041] In a possible embodiment, the fixing member 21 is used to separate the cover plate 3 from the busbar plate 2 and fix the distance, so the fixing member 21 can be a cushion such as foam paste between the cover plate 3 and the busbar plate 2, or a rod, a stud, etc. The fixing manner of the fixing member 21 with the cover plate 3 and the busbar plate 2 can be paste, clamping, riveting, welding or screwing, etc. In the embodiment, the stud is taken as an example, and reference is made to FIGS. 4 and 5. Figure 4As shown, the four corners of the busbar plate 2 are provided with mounting holes, the studs are butted with the mounting holes of the busbar plate 2, and the studs are firmly fixed on the busbar plate 2; similarly, the cover plate 3 is firmly fixed on the top of the stud. The studs relatively fix the busbar plate 2 and the cover plate 3 at both ends, so that the cavity 25 is formed between the busbar plate 2 and the cover plate 3, and the height of the cavity 25 is the height of the stud. If the manufacturing process changes, different height cavities 25 are needed, only the studs of different height sizes need to be replaced, and the rest of the screws and other accessories are all suitable, greatly reducing the difficulty of process change. At the same time, the cavity 25 formed by the installation of the stud is more stable than the cavity 25 formed by the paste of foam and the clamping, and the stud can easily transmit force to both ends, so that the cavity 25 structure is more stable, and the reliability of the cavity 25 is greatly improved.

[0042] In a possible embodiment, the cavity 25 is provided with an anti-overflow member (not shown in the figure) around the cavity 25, so that the cavity 25 structure forms a filling space that will not overflow, preventing the heat-conducting pouring glue 8 from flowing out from all around when it is not solidified. The anti-overflow member can be a plate member, a ring-shaped member provided around the cavity 25, or a part of the busbar plate 2 or the cover plate 3, or a tape wrapped around the busbar plate 2 or the cover plate 3. In this embodiment, the fiberglass tape is taken as an example. The fiberglass tape has the characteristics of tough material, high temperature resistance, low temperature resistance and chemical corrosion resistance, and after the fiberglass tape is wrapped around the soft package battery module, the size hardly changes, which does not affect the assembly of the existing soft package battery module; before pouring the heat-conducting pouring glue 8, the fiberglass tape is simultaneously attached to the edges of the cover plate 3 and the busbar plate 2 and wrapped for several turns, so that the cavity 25 structure between the cover plate 3 and the busbar plate 2 is sealed. In this way, when the heat-conducting pouring glue 8 is poured, the un-solidified glue will not flow out of the cavity 25.

[0043] In a possible embodiment, the cover plate 3 is provided with a pouring hole 31, and the pouring hole 31 is in communication with the cavity 25. The pouring hole 31 is a through hole provided on the cover plate 3, which is in communication with the space above the cover plate 3 and the cavity 25 structure below the cover plate 3; the pouring hole 31 can be one or multiple, and the position is not limited. In this embodiment, multiple pouring holes 31 are taken as an example, and the cover plate 3 is provided with multiple pouring holes 31 side by side. When pouring, the pouring equipment can match multiple pouring holes 31 at the same time, and the heat-conducting pouring glue 8 is injected into multiple points of the cavity 25 at the same time, so that the heat-conducting pouring glue 8 is poured more uniformly. Figure 5

[0044] ​The battery pack also comprises a shell 9, the soft-pack battery module as any of the above embodiments is arranged in the shell 9, the shell 9 comprises a box body 91 and a box cover 92, the box body 91 has a receiving cavity for accommodating the cell group 1, a buffer such as foam is pasted on the inner wall of the box body 91 to protect the cell group 1 and related components in the soft-pack battery module, and the box body 91 of the shell 9 is sealed with the box cover 92 to seal the cell group 1. The buffer can be a porous material such as foam, or a filler or elastic member such as foam, silica gel, air cushion, etc.; among these materials, the foam is relatively preferred, the foam is widely used in the battery field, and the foam arranged in the battery pack can play a heat insulation role when the cell expands due to heat or shrinks due to cold, and can slow down the heat transfer, especially when the cell is out of control, the heat diffusion can be effectively inhibited, and the occurrence of the accident can be delayed; at the same time, the foam has good elasticity and resilience, can absorb the impact force generated by the movement or vibration of the cell or other components of the battery pack, and can maximize the stability of the cell group 1, the busbar 2, the cover plate 3 and the battery protection plate 4 and other structures, so as to protect the integrity of the internal structure of the soft-pack battery module. A current input and output interface is arranged on the shell 9, the input and output interface is connected with the cell group 1 and the electrical components thereof, and is convenient for connection with other soft-pack battery modules or equipment. The input and output interface is arranged on the box cover 92, and a handle and other components are arranged on the box cover 92, and the handle is convenient for personnel to move the soft-pack battery module.

[0045] In order to prevent the battery protection plate 4 from bearing the limiting pressure in the vertical direction for a long time and causing quality problems, a limiting piece 5 is arranged on the cover plate 3, and the upper and lower ends of the limiting piece 5 are respectively in abutment with the cover plate 3 and the inner wall of the box cover 92. The limiting piece 5 is used for limiting the cover plate 3 and related components connected thereto in the vertical direction, so that the cell group 1, the busbar 2, the box cover 92 and the battery protection plate 4 are kept stable in structure in the vertical direction in the shell 9; one end of the limiting piece 5 is in abutment with a part of the cover plate 3 without other components, and the other end is in abutment with the inner wall of the box cover 92, the limiting piece 5 exerts force on the cover plate 3 by the restoring force generated by the deformation of the limiting piece 5 itself, so that the cover plate 3 is kept stable in the vertical direction (as shown in Figure 1 Figure 7 ​The limiting member 5 can be a porous material such as foam, and can also be a filler or elastic member such as foam, silica gel, air cushion, etc. Among these materials, foam is relatively preferred, and the top end of the corresponding foam should be higher than the box 91 or part of it should exceed the structure of the box 91. Foam is widely used in the field of batteries. When the foam is arranged in the battery pack, it can play a heat insulation role when the battery cell expands due to heat or shrinks due to cold, and can slow down the transfer of heat. In particular, when the battery cell is out of control, it can effectively inhibit the spread of heat and delay the occurrence of accidents. At the same time, it has good elasticity and resilience, can absorb the impact force generated by the movement or vibration of the battery cell or other components of the battery pack, and can maximize the stability of the battery cell group 1, the bus bar 2, the cover plate 3 and the battery protection plate 4 and other structures, thereby protecting the integrity of the internal structure of the soft package battery module.

[0046] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical concept disclosed by the present application should be covered by the claims of the present application.

Claims

1. A soft-pack battery module, comprising a cell assembly (1), wherein a busbar (2) is disposed on the top of the cell assembly (1), and the busbar (2) is electrically connected to the cell assembly (1), characterized in that, A fixing member (21) is provided on the busbar (2), and a cover plate (3) is provided on the fixing member (21). A cavity (25) is formed between the cover plate (3) and the busbar (2). Thermally conductive potting compound (8) is filled in the cavity (25). A battery protection plate (4) is detachably installed on the cover plate (3).

2. The soft-pack battery module according to claim 1, characterized in that, The busbar (2) is provided with a terminal block, and the height of the cavity (25) is higher than the height of the terminal block.

3. The soft-pack battery module according to claim 1, characterized in that, The fastener (21) is a stud.

4. The soft-pack battery module according to claim 1, characterized in that, The cavity (25) is surrounded by anti-overflow components.

5. The soft-pack battery module according to claim 4, characterized in that, The spill-proof component is fiberglass tape.

6. The soft-pack battery module according to claim 1, characterized in that, The cover plate (3) is provided with a filling hole (31), which is connected to the cavity (25).

7. The soft-pack battery module according to claim 1, characterized in that, Multiple tabs (12) extend from the battery cell assembly (1). The busbar (2) is provided with through holes, and a nickel sheet area is also provided on the busbar (2) around the through holes. The tabs (12) are provided through the through holes. The tabs (12) are provided with hook-shaped parts. A copper busbar (23) is inserted between the hook-shaped parts and the busbar (2). The upper and lower ends of the copper busbar (23) abut against the hook-shaped parts and the nickel sheet area, respectively. The copper busbar (23) is electrically connected to the busbar (2) through the nickel sheet area.

8. A battery pack, characterized in that, The device includes a housing (9), which includes a box body (91) and a box cover (92). The box body (91) is equipped with a soft-pack battery module as described in any one of claims 1 to 7. A limiting member (5) is provided between the cover plate (3) and the box cover (92). The upper and lower ends of the limiting member (5) abut against the inner wall of the box cover (92) and the cover plate (3), respectively.

9. The battery pack according to claim 8, characterized in that, The limiting component (5) is foam.

10. The battery pack according to claim 8, characterized in that, A buffer is provided between the housing (91) and the soft-pack battery module.

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