Battery module and lithium ion battery

Abstract

The utility model relates to the technical field of batteries, in particular to a battery module and a lithium ion battery. The battery module comprises a battery cell assembly and a protection plate, the battery cell assembly comprises a first battery cell and a second battery cell which are stacked, one end of the first battery cell is provided with a first tab group, one end of the second battery cell is provided with a second tab group, the first tab group comprises a first positive tab and a first negative tab, and the second tab group comprises a second positive tab and a second negative tab. A mounting space is formed between the first tab group and the second tab group; the protection plate is inserted into the mounting space, so that the first tab group and the second tab group are respectively positioned on two sides of the protection plate, the first positive tab and the first negative tab are respectively connected with one side of the protection plate through first connecting sheets, and the second positive tab and the second negative tab are respectively connected with the other side of the protection plate through second connecting sheets. Through the arrangement, the welding requirements of the protection plate, the first tab group and the second tab group can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery module and a lithium ion battery. Background Art

[0002] With the rapid development of new energy batteries and consumer electronic products, lithium-ion batteries are widely used in consumer electronic products. At the same time, the technology of lithium-ion batteries has also been rapidly improved to meet people's demand for electronic products.

[0003] When consumer ultra-thin polymer lithium-ion batteries (single cell thickness ≤ 3mm) are combined in series, the protection plate is arranged on the top of the two cells, and the positive and negative electrodes of the two cells are connected to one side of the protection plate through nickel sheets. The conventional nickel sheet size (length, width and thickness) is at least 3mm*3mm*0.1mm. When the cell thickness is less than 3mm, the maximum thickness of the two cells after stacking is 6mm. Therefore, the maximum dimension of the protection plate along the thickness direction of the two cells cannot exceed 6mm. When spot welding is performed on one side of the protection plate, a safe distance cannot be reserved between the nickel sheets corresponding to the positive or negative electrodes of the two cells along the thickness direction of the two cells on the protection plate, and welding of the protection plate to the positive and negative electrodes of the two cells cannot be achieved. Utility Model Content

[0004] The technical problem to be solved by the embodiments of the utility model is to provide a battery module and a lithium-ion battery to solve the problem in the prior art that a safe distance cannot be reserved for the nickel sheets corresponding to the positive or negative electrodes of the two battery cells on the protective plate along the thickness direction of the two battery cells, and welding between the protective plate and the positive and negative electrodes of the two battery cells cannot be achieved.

[0005] The utility model discloses a battery module, comprising: a battery cell assembly and a protection plate, the battery cell assembly comprising a first battery cell and a second battery cell which are stacked, a first pole lug group being arranged at one end of the first battery cell, a second pole lug group being arranged at one end of the second battery cell, the first pole lug group comprising a first positive pole lug and a first negative pole lug, the second pole lug group comprising a second positive pole lug and a second negative pole lug, an installation space being formed between the first pole lug group and the second pole lug group; the protection plate being inserted into the installation space so that the first pole lug group and the second pole lug group are respectively located at two sides of the protection plate, the first positive pole lug and the first negative pole lug are respectively connected to one side of the protection plate through a first connecting sheet, and the second positive pole lug and the second negative pole lug are respectively connected to the other side of the protection plate through a second connecting sheet.

[0006] Optionally, the battery module also includes: a first U-shaped insulating member, the bottom plate of which is disposed between the battery cell assembly and the protective plate, and the two side plates of which are respectively located between the first pole lug group and the first connecting plate and between the second pole lug group and the second connecting plate.

[0007] Optionally, the battery module also includes: a second U-shaped insulating member, arranged at the end of the battery cell assembly, the first pole lug group and the second pole lug group are both arranged in the second U-shaped insulating member, and are respectively connected to the two side plates of the second U-shaped insulating member, and one end of the protective plate extends out of the installation space and is connected to the top plate of the second U-shaped insulating member.

[0008] Optionally, the battery module further includes: a first insulating member, wherein the first insulating member is circumferentially sleeved on the second U-shaped insulating member along the upper portion of the second U-shaped insulating member.

[0009] Optionally, a plug wire is further provided on the protection plate, and the plug wire passes through the top plate of the second U-shaped insulating member and extends outward.

[0010] Optionally, a second insulating member is provided between the first battery core and the second battery core.

[0011] Optionally, the first connecting sheet and the second connecting sheet are in a U-shaped structure, and the free ends of the first positive electrode ear, the first negative electrode ear, the second positive electrode ear, and the second negative electrode ear are arranged in the U-shaped structure along an opening of the U-shaped structure.

[0012] Optionally, a relief opening is formed on the top plate of the second U-shaped insulating member, and the plug wire extends out from the second U-shaped insulating member along the relief opening.

[0013] Optionally, the first U-shaped insulating member, the second U-shaped insulating member, the first insulating member and the second insulating member are all made of insulating tape.

[0014] The utility model also discloses a lithium ion battery, comprising the battery module mentioned above.

[0015] Compared with the prior art, the battery module and lithium-ion battery provided by the embodiments of the utility model have the following beneficial effects: the first battery cell and the second battery cell of the battery cell assembly are stacked so that an installation space can be formed between the first pole lug group arranged at one end of the first battery cell and the second pole lug group arranged at one end of the second battery cell, and the protection plate is inserted into the installation space, the first pole lug group and the second pole lug group are respectively located on both sides of the protection plate, the first positive pole lug and the first negative pole lug are respectively connected to one side of the protection plate through the first connecting piece, and the second positive pole lug and the second negative pole lug are respectively connected to the other side of the protection plate through the second connecting piece, and the first connecting piece and the second connecting piece are respectively attached to the two side surfaces of the protection plate for connection. This layout and connection method can avoid the phenomenon that a safe distance position cannot be reserved when the first pole lug group and the second pole lug group are welded on the same side of the protection plate through the first connecting piece and the second connecting piece, and meet the welding requirements of the protection plate and the first pole lug group and the second pole lug group. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The technical solution of the utility model will be further described in detail below with reference to the accompanying drawings and embodiments, in which:

[0017] Figure 1 It is a schematic diagram of the exploded structure of a battery module provided by an embodiment of the utility model;

[0018] Figure 2 It is a schematic diagram of the overall structure of the battery module provided by the embodiment of the utility model;

[0019] Figure 3 It is a schematic diagram of the cross-sectional structure of a battery module provided by an embodiment of the utility model;

[0020] Figure 4 yes Figure 3 A partial enlarged schematic diagram of the position A in the middle;

[0021] Figure 5 It is a structural schematic diagram of a first connecting piece and a protection plate provided in an embodiment of the utility model;

[0022] Figure 6 It is a structural schematic diagram of the second connecting piece and the protection plate provided in an embodiment of the utility model.

[0023] The reference numerals in the figures are:

[0024] 10. Battery cell assembly; 110. First battery cell; 111. First positive ear; 112. First negative ear; 120. Second battery cell; 121. Second positive ear; 122. Second negative ear; 101. Installation space; 20. Protection plate; 210. First connecting piece; 220. Second connecting piece; 30. First U-shaped insulating member; 40. Second U-shaped insulating member; 401. Opening; 50. First insulating member; 60. Plug wire; 70. Second insulating member. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Now, in conjunction with the accompanying drawings, a preferred embodiment of the present utility model is described in detail.

[0026] The utility model embodiment provides a battery module, such as Figures 1 to 6 As shown, it includes a battery cell assembly 10 and a protection plate 20, the battery cell assembly 10 includes a first battery cell 110 and a second battery cell 120 stacked, one end of the first battery cell 110 is provided with a first pole ear group, one end of the second battery cell 120 is provided with a second pole ear group, the first pole ear group includes a first positive pole ear 111 and a first negative pole ear 112, the second pole ear group includes a second positive pole ear 121 and a second negative pole ear 122, and an installation space 101 is formed between the first pole ear group and the second pole ear group; the protection plate 20 is inserted into the installation space 101, so that the first pole ear group and the second pole ear group are respectively located on both sides of the protection plate 20, the first positive pole ear 111 and the first negative pole ear 112 are respectively connected to one side of the protection plate 20 through the first connecting sheet 210, and the second positive pole ear 121 and the second negative pole ear 122 are respectively connected to the other side of the protection plate 20 through the second connecting sheet 220.

[0027] In the battery module of the present embodiment, the first battery cell 110 and the second battery cell 120 of the battery cell assembly 10 are stacked so that an installation space 101 can be formed between the first pole ear group arranged at one end of the first battery cell 110 and the second pole ear group arranged at one end of the second battery cell 120. The protection plate 20 is inserted into the installation space 101, the first pole ear group and the second pole ear group are respectively located on both sides of the protection plate 20, and the first positive pole ear 111 and the first negative pole ear 112 are respectively welded to one side of the protection plate 20 through the first connecting sheet 210. The second positive electrode ear 121 and the second negative electrode ear 122 are respectively connected to the other side of the protection plate 20 through the second connecting piece 220, and the first connecting piece 210 and the second connecting piece 220 are respectively attached to the two side surfaces of the protection plate 20 for connection. This layout and connection method can avoid the phenomenon that a safe distance position cannot be reserved when the first electrode ear group and the second electrode ear group are welded on the same side of the protection plate 20 through the first connecting piece 210 and the second connecting piece 220, thereby meeting the welding requirements of the protection plate 20 and the first electrode ear group and the second electrode ear group.

[0028] The first connecting piece 210 and the second connecting piece 220 of this embodiment can be pure nickel sheets or nickel-plated steel sheets. The first connecting piece is welded to one side of the protection plate, and the second connecting piece is welded to the other side of the protection plate. Commonly used welding methods include laser welding, resistance welding, tin soldering, etc.

[0029] Please refer to Figure 5 and Figure 6When the size (length, width and thickness) of the first connecting piece 210 and the second connecting piece 220 is 3mm*3mm*0.1mm, the width of the protection plate 20 can be effectively reduced to within 5mm, and the layout requirements of the first connecting piece 210 and the second connecting piece 220 on the protection plate 20 can be guaranteed, and the material of the protection plate 20 can be saved. The series combination of consumer ultra-thin polymer lithium-ion batteries is met.

[0030] in, Figure 6 The Z direction represents the width of the protection plate 20 .

[0031] The above two first connecting pieces 210 are distributed on one side of the protective plate 20 along the length direction of the protective plate 20, and the above two second connecting pieces 220 are distributed on the other side of the protective plate 20 along the length direction of the protective plate 20; wherein, referring to Figure 6 , the X direction represents the length direction of the protection plate 20 , the Y direction represents the thickness direction of the protection plate 20 , and the Z direction represents the width direction of the protection plate 20 .

[0032] Figure 1 The X direction indicates the thickness direction of the first battery cell 110 and the second battery cell 120 .

[0033] As a preferred solution of this embodiment, refer to Figure 1 and Figure 4 The battery module also includes: a first U-shaped insulating member 30, the bottom plate of the first U-shaped insulating member 30 is arranged between the battery cell assembly 10 and the protection plate 20, and the two side plates of the first U-shaped insulating member 30 are respectively located between the first pole lug group and the first connecting plate 210 and between the second pole lug group and the second connecting plate 220.

[0034] Among them, the above-mentioned first U-shaped insulating member 30 is used to prevent direct contact between the protection plate 20 and the battery cell assembly 10, avoid short circuit problems caused by metal contact, and improve the safety of the battery. In this embodiment, the first U-shaped insulating member 30 can be an insulating tape, which plays a buffering role between the protection plate 20 and the battery cell assembly 10, and can reduce the impact of mechanical vibration on the internal structure of the first battery cell 110 and the second battery cell 120, extend the service life of the first battery cell 110 and the second battery cell 120, and thereby improve the service life of the battery module of this embodiment; the above-mentioned first U-shaped insulating member 30 is also used to protect the welding points between the first pole ear group and the first connecting piece 210 and the welding points between the second pole ear group and the second connecting piece 220.

[0035] As a preferred solution of this embodiment, refer to Figure 1 and Figure 4The battery module also includes: a second U-shaped insulating member 40, which is arranged at the end of the battery cell assembly 10, the first pole lug group and the second pole lug group are both arranged in the second U-shaped insulating member 40, and are respectively connected to the two side plates of the second U-shaped insulating member 40, and one end of the protective plate 20 extends out of the installation space 101 and is connected to the top plate of the second U-shaped insulating member 40.

[0036] Among them, the setting of the above-mentioned second U-shaped insulating member 40 plays the role of protecting the shell, preventing the first pole lug group, the second pole lug group and the protection plate 20 from being damaged by external forces, and at the same time can effectively reduce the short circuit problem caused by external metal contact, thereby improving the safety performance of the battery module.

[0037] The first tab group and the second tab group are both arranged in the second U-shaped insulating member 40 and are respectively connected to the two side plates of the second U-shaped insulating member 40. One end of the protection plate 20 extends out of the installation space 101 and is connected to the top plate of the second U-shaped insulating member 40, which can also improve the overall integration of the battery module and ensure the overall connection stability of the battery module. The structural setting of the second U-shaped insulating member 40 improves the installation convenience of the second U-shaped insulating member 40.

[0038] As a preferred solution of this embodiment, refer to Figure 1 , Figure 3 and Figure 4 The battery module further includes: a first insulating member 50 , which is circumferentially sleeved on the second U-shaped insulating member 40 along the upper portion of the second U-shaped insulating member 40 .

[0039] The above-mentioned first insulating member 50 is a rectangular frame with openings 401 at both ends, and is mounted on the second U-shaped insulating member 40 in cooperation with the second U-shaped insulating member 40. On the basis of the second U-shaped insulating member 40, the connection strength between the ends of the first battery cell 110 and the second battery cell 120 is strengthened, and the role of protecting the shell is played again, and the safety performance of the first pole lug group, the second pole lug group and the protection plate 20 is strengthened to prevent damage caused by external force impact. At the same time, the short circuit problem caused by external metal contact is strengthened again, thereby improving the safety performance of the battery.

[0040] As a preferred solution of this embodiment, refer to Figure 1 , Figure 3 and Figure 4 A plug wire 60 is also provided on the protection plate 20 , and the plug wire 60 passes through the top plate of the second U-shaped insulating member 40 and extends outward.

[0041] The plug wire 60 is provided to realize the electrical connection between the battery module and the external device, and connect the power output of the battery cell assembly 10 to the external device or circuit, so as to realize the transmission of power, data, charging, etc.

[0042] Furthermore, a relief opening is formed on the top plate of the second U-shaped insulating member 40 , and the relief opening is provided to provide an installation environment for the plug wire 60 .

[0043] As a preferred solution of this embodiment, refer to Figure 1 A second insulating member 70 is disposed between the first battery cell 110 and the second battery cell 120 .

[0044] Among them, the setting of the above-mentioned second insulating member 70, on the one hand, can effectively isolate the metal shells between the first battery cell 110 and the second battery cell 120, prevent the circuit short circuit, and ensure the safe operation of the battery cell assembly 10; on the other hand, the second insulating member 70 can prevent the metal shells between the first battery cell 110 and the second battery cell 120 from directly contacting each other, avoid the short circuit problem caused by the contact of the shells, and improve the stability and safety of the battery cell assembly 10; on the other hand, the second insulating member 70 can provide a certain buffering and fixing effect between the first battery cell 110 and the second battery cell 120, reduce the friction and collision between the first battery cell 110 and the second battery cell 120 during vibration or movement, and help maintain the stability of the battery cell assembly 10; finally, by setting the second insulating member 70, the overall stability and reliability of the battery cell assembly 10 can be improved.

[0045] The second insulating member 70 of this embodiment can be made of double-sided adhesive tape. Figure 1 , an example is given in which two second insulating members 70 are provided, and the number of the second insulating members 70 is adaptively arranged according to the size of the first battery cell 110 and the second battery cell 120 , and is not specifically limited here.

[0046] As a preferred solution of this embodiment, refer to Figure 5 and Figure 6 The first connecting piece 210 and the second connecting piece 220 are in a U-shaped structure, and the free ends of the first positive electrode ear 111, the first negative electrode ear 112, the second positive electrode ear 121, and the second negative electrode ear 122 are arranged in the U-shaped structure along the opening 401 of the U-shaped structure.

[0047] Among them, during the assembly process of the battery module of this embodiment, the first connecting sheet 210 and the second connecting sheet 220 are made of pure nickel sheets, and the pure nickel sheets are of a conventional L-shaped structure. One end of the first connecting sheet 210 and the second connecting sheet 220 are connected to the protective plate 20, and the free ends of the first connecting sheet 210 and the second connecting sheet 220 are bent so that the first connecting sheet 210 and the second connecting sheet 220 are in a U-shaped structure, thereby realizing that the free end of the first positive electrode ear 111, the free end of the first negative electrode ear 112, the free end of the second positive electrode ear 121, and the free end of the second negative electrode ear 122 are arranged in the U-shaped structure along the opening 401 of the U-shaped structure, so as to protect the welding points of the first electrode ear group and the second electrode ear group with the protective plate 20 respectively.

[0048] In this embodiment, the first U-shaped insulating member 30 , the second U-shaped insulating member 40 , the first insulating member 50 , and the second insulating member 70 are all made of insulating tape.

[0049] The present application also discloses a lithium-ion battery, the battery module in the above embodiment. The lithium-ion battery includes the same structure and beneficial effects as the battery module in the above embodiment. The structure and beneficial effects of the battery module have been described in detail in the above embodiment and will not be repeated here.

[0050] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present utility model rather than to limit it. For those skilled in the art, the technical solutions described in the above embodiments can be modified, or some of the technical features therein can be replaced by equivalents; and all these modifications and replacements should fall within the scope of protection of the claims attached to the present utility model.

Claims

1. A battery module, characterized in that: include: A battery cell assembly, comprising a first battery cell and a second battery cell stacked together, wherein a first electrode tab group is disposed at one end of the first battery cell, a second electrode tab group is disposed at one end of the second battery cell, the first electrode tab group comprises a first positive electrode tab and a first negative electrode tab, the second electrode tab group comprises a second positive electrode tab and a second negative electrode tab, and an installation space is formed between the first electrode tab group and the second electrode tab group; The protection plate is inserted in the installation space so that the first pole lug group and the second pole lug group are respectively located on both sides of the protection plate, the first positive pole lug and the first negative pole lug are respectively connected to one side of the protection plate through a first connecting piece, and the second positive pole lug and the second negative pole lug are respectively connected to the other side of the protection plate through a second connecting piece.

2. The battery module according to claim 1, characterized in that: The battery module also includes: A first U-shaped insulating member, wherein the bottom plate of the first U-shaped insulating member is disposed between the battery cell assembly and the protection plate, and the two side plates of the first U-shaped insulating member are respectively located between the first tab group and the first connecting sheet and between the second tab group and the second connecting sheet.

3. The battery module according to claim 2, characterized in that: The battery module also includes: The second U-shaped insulating member is arranged at the end of the battery cell assembly, the first pole lug group and the second pole lug group are both arranged in the second U-shaped insulating member and are respectively connected to the two side plates of the second U-shaped insulating member, and one end of the protective plate extends out of the installation space and is connected to the top plate of the second U-shaped insulating member.

4. The battery module according to claim 3, characterized in that: The battery module also includes: The first insulating member is sleeved on the second U-shaped insulating member along the circumferential direction of the second U-shaped insulating member.

5. The battery module according to claim 4, characterized in that: The protection plate is also provided with a plug wire, and the plug wire passes through the top plate of the second U-shaped insulating member and extends outward.

6. The battery module according to claim 5, characterized in that: A second insulating member is disposed between the first battery core and the second battery core.

7. The battery module according to claim 1, characterized in that: The first connecting sheet and the second connecting sheet are in a U-shaped structure, and the free ends of the first positive electrode ear, the first negative electrode ear, the second positive electrode ear, and the second negative electrode ear are arranged in the U-shaped structure along an opening of the U-shaped structure.

8. The battery module according to claim 5, characterized in that: A relief opening is formed on the top plate of the second U-shaped insulating member, and the plug wire extends out from the second U-shaped insulating member along the relief opening.

9. The battery module according to claim 6, characterized in that: The first U-shaped insulating member, the second U-shaped insulating member, the first insulating member and the second insulating member are all made of insulating tape.

10. A lithium ion battery, characterized in that: A battery module comprising any one of claims 1 to 9.

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