Laminated battery capable of reducing internal resistance

Abstract

The utility model discloses a laminated battery capable of reducing internal resistance, which comprises a battery body, a plurality of laminated battery cells are accommodated in the battery body, each laminated battery cell comprises a plurality of positive plates, diaphragms and negative plates which are sequentially stacked, tabs are arranged on the positive plates and the negative plates, a connecting assembly is arranged in the battery body, and the connecting assembly is connected with the battery body. Each laminated battery cell is provided with two connecting assemblies, the two connecting assemblies are respectively connected with tabs of a plurality of positive plates and tabs of a plurality of negative plates, the top of the battery body is provided with a positive pole and a negative pole, the connecting assemblies at the positive plates of the laminated battery cells positioned below the positive pole are connected with the positive pole, and the connecting assemblies at the negative plates of the laminated battery cells positioned below the negative pole are connected with the negative pole. And the connecting assembly at the negative plate of the laminated battery cell below the negative column is connected with the negative column to form the negative electrode of the battery body. The battery has the effects that the positive tab and the negative tab are respectively connected with the positive pole and the negative pole by welding and additionally arranging the connecting assembly, so that the connecting stability is ensured, and the internal resistance is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a laminated battery with reduced internal resistance. Background Art

[0002] With the advancement of science and technology, lithium-ion batteries have become the current development trend as the power energy source for current power equipment. In terms of application requirements, power lithium-ion batteries not only require high capacity, but also require long-lasting high-rate discharge. Laminated lithium-ion batteries are currently the mainstream power lithium-ion batteries.

[0003] The laminated lithium-ion battery in the prior art is mainly composed of stacked positive electrode sheets, negative electrode sheets, and a separator, wherein the separator is separated between each positive electrode sheet and the negative electrode sheet, and the positive electrode ears and negative electrode ears are welded or riveted to the electrode ear welding positions of each positive electrode sheet and the negative electrode sheet, respectively. Then, the positive electrode ears on each positive electrode sheet are connected together, and the negative electrode ears on each negative electrode sheet are connected together, which is equivalent to the internal multi-cell parallel connection of the overall laminated lithium-ion battery to achieve high current discharge to the outside.

[0004] The positive and negative tabs are welded to the positive and negative poles respectively through connecting plates. However, during the use of the battery, the vibration of the battery and the internal winding core structure may damage the reliability of the connecting plate welds. When the welds are damaged, the reliability of the connecting plates will be affected, which will cause the internal resistance of the battery to increase and thus cause safety accidents. Utility Model Content

[0005] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a laminated battery with reduced internal resistance.

[0006] The purpose of this utility model is achieved through the following technical solutions:

[0007] A laminated battery with reduced internal resistance comprises: a battery body, wherein the battery body accommodates multiple laminated battery cells, the laminated battery cells comprising multiple positive electrode sheets, diaphragms and negative electrode sheets stacked in sequence, the positive electrode sheets and the negative electrode sheets are both provided with tabs, the tabs provided on the positive electrode sheets are positive tabs, and the tabs provided on the negative electrode sheets are negative tabs, a connecting assembly is provided in the battery body, each of the laminated battery cells is provided with two connecting assemblies, and the two connecting assemblies are respectively connected to the positive tabs of the multiple positive electrode sheets and the negative tabs of the multiple negative electrode sheets, a positive electrode post and a negative electrode post are provided on the top of the battery body, the connecting assembly at the positive electrode sheet of the laminated battery cell located below the positive electrode post is connected to the positive electrode post to form the positive electrode of the battery body, and the connecting assembly at the negative electrode sheet of the laminated battery cell located below the negative electrode post is connected to the negative electrode post to form the negative electrode of the battery body.

[0008] In one embodiment, the battery body includes a shell, the top end of the shell is open, a plurality of accommodating cavities are provided in the shell, and the plurality of laminated battery cells are sequentially accommodated in the plurality of accommodating cavities.

[0009] In one embodiment, the top cover of the shell is provided with a cover body, the positive electrode column and the negative electrode column are both located on the cover body, and the lower ends of the positive electrode column and the negative electrode column pass through the cover body and extend into the shell to be connected to the corresponding connecting components of the positive electrode sheet and the negative electrode sheet respectively.

[0010] In one embodiment, each of the laminated battery cells includes a plurality of battery cell units stacked in layers, and the battery cell units include a positive electrode sheet, a separator, and a negative electrode sheet stacked in sequence.

[0011] In one embodiment, the connecting assembly includes a connecting block and a connecting column passing through the connecting block, the connecting block is located between two of the same-sex pole ears among multiple positive pole ears or negative pole ears on a stacked battery cell, the outer wall of the connecting column is provided with a thread, the connecting column passes through the pole ear on one side of the connecting block, the connecting block and the pole ear on the other side of the connecting block in sequence from the outside of the multiple pole ears, and the connecting column connects and fixes the multiple pole ears to the connecting block.

[0012] In one embodiment, connecting plates are provided on both opposite outer sides of the connecting block, and the connecting plates are located on the side of the pole ear away from the connecting block. A threaded hole is penetrated in the connecting plate, and the connecting column penetrates the connecting plate and the pole ear on one side of the connecting block, the connecting block, and the pole ear and connecting plate on the other side of the connecting block in sequence. The thread on the connecting column is threadedly connected to the inner wall of the threaded hole of the connecting plate.

[0013] In one embodiment, a busbar is provided on the connecting block at the positive electrode sheets or the negative electrode sheets of two adjacent laminated battery cells. The busbar is used to connect the connecting blocks at the positive electrode sheets of two adjacent laminated battery cells or the connecting blocks at the negative electrode sheets of two adjacent laminated battery cells. Bolts are passed through the positions of the busbar relative to the two connecting blocks, and a through hole is provided in the middle position of the busbar for fixing the busbar in the shell by bolts.

[0014] In one embodiment, a first threaded hole is provided on the connecting block at the positive electrode sheet below the positive electrode column. The first threaded hole is used for the positive electrode column to pass through. A bolt is provided at the lower end of the positive electrode column and is threadedly connected to the inner wall of the first threaded hole.

[0015] In one embodiment, a second threaded hole is provided on the connection block at the negative electrode sheet below the negative electrode column, and the second threaded hole is used for the negative electrode column to pass through. A bolt is provided at the lower end of the negative electrode column and is threadedly connected to the inner wall of the second threaded hole.

[0016] In one embodiment, the battery body includes an electrolyte, and the electrolyte infiltrates the plurality of laminated battery cells in the battery body.

[0017] Compared with the prior art, the present invention has at least the following advantages:

[0018] The utility model discloses a laminated battery with reduced internal resistance, which connects the positive tabs of multiple positive plates or the negative tabs of multiple negative plates in each laminated battery by providing a connection assembly to avoid the problem of unstable welding. The battery body is not prone to loosening under long-term use, which would lead to an increase in the internal resistance of the battery body. When the battery body is connected to the positive electrode column and the negative electrode column, the positive electrode column and the negative electrode column are passed through the corresponding connection blocks below them to form the positive and negative electrodes of the battery body, so that the positive tab and the negative tab are not connected to the positive electrode column and the negative electrode column respectively by welding, thereby ensuring the stability of the connection and reducing the internal resistance of the battery body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for use in the embodiments.

[0020] Figure 1 This is a schematic structural diagram of a laminated battery with reduced internal resistance provided by the present invention;

[0021] Figure 2 This is a structural schematic diagram of a laminated battery with reduced internal resistance provided by the present invention with the cover removed;

[0022] Figure 3 This is a schematic diagram of the stacking structure of the battery cell units in a laminated battery with reduced internal resistance provided by the present invention;

[0023] Figure 4 This is a schematic structural diagram of the connection of multiple laminated battery cells in a laminated battery with reduced internal resistance provided by the utility model.

[0024] Description of the drawings: 10. Battery body; 11. Shell; 111. Accommodation cavity; 12. Cover; 20. Laminated battery cell; 201. Battery cell unit; 21. Positive electrode sheet; 22. Diaphragm; 23. Negative electrode sheet; 30. Tab; 31. Positive electrode tab; 32. Negative electrode tab; 40. Positive electrode column; 50. Negative electrode column; 60. Connecting block; 61. First threaded hole; 62. Second threaded hole; 70. Connecting column; 80. Connecting sheet; 90. Busbar; 91. Bolt; 92. Through hole. DETAILED DESCRIPTION

[0025] In order to facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings.

[0026] A laminated battery with reduced internal resistance, referring to Figure 1 and Figure 2 , including a battery body 10, which accommodates a plurality of laminated battery cells 20. The plurality of laminated battery cells 20 are arranged in sequence within the battery body 10. The laminated battery cells 20 include a plurality of positive electrode sheets 21, a separator 22, and a negative electrode sheet 23 stacked in sequence. Both the positive electrode sheets 21 and the negative electrode sheets 23 are provided with tabs 30. The tabs 30 provided on the positive electrode sheet 21 are positive tabs 31, and the tabs 30 provided on the negative electrode sheet 23 are negative tabs 32. A connecting assembly is provided within the battery body 10, with each laminated battery cell 20 provided with two connecting assemblies. The two connecting assemblies are used to respectively connect the positive tabs 31 of the plurality of positive electrode sheets 21 and the negative tabs 32 of the plurality of negative electrode sheets 23. The positive tabs 31 of the plurality of positive electrode sheets 21 in the laminated battery cell 20 are connected by one connecting assembly, and the negative tabs 32 of the plurality of negative electrode sheets 23 are connected by another connecting assembly. The top of the battery body 10 is provided with a positive electrode post 40 and a negative electrode post 50, respectively located near the left and right edges of the battery body 10. The connector assembly at the positive electrode sheet 21 of the laminated battery cell 20 located below the positive electrode post 40 connects to the positive electrode post 40 to form the positive electrode of the battery body 10; the connector assembly at the negative electrode sheet 23 of the laminated battery cell 20 located below the negative electrode post 50 connects to the negative electrode post 50 to form the negative electrode of the battery body 10.

[0027] Further, refer to Figure 1 and Figure 2 The battery body 10 includes a shell 11, which is hollow and has an open top. The shell 11 is provided with a plurality of accommodating cavities 111 equidistantly distributed along the length of the shell 11, and a plurality of laminated battery cells 20 are sequentially accommodated in the plurality of accommodating cavities 111. A cover 12 is provided at the top of the shell 11, and the cover 12 is provided on the top of the shell 11 to form a sealed space in the battery body 10. The positive electrode column 40 and the negative electrode column 50 are both located on the cover 12, and the lower ends of the positive electrode column 40 and the negative electrode column 50 pass through the cover 12 and extend into the shell 11 to be connected to the corresponding connecting components of the positive electrode sheet 21 and the connecting components of the negative electrode sheet 23 respectively.

[0028] Further, refer to Figure 3Each laminated battery cell 20 includes a plurality of stacked battery cells 201. Each battery cell 201 includes a positive electrode sheet 21, a separator 22, and a negative electrode sheet 23 stacked in sequence. The positive electrode sheet 21 is provided with a positive electrode tab 31, which is electrically connected to the positive electrode sheet 21. The negative electrode sheet 23 is provided with a negative electrode tab 32, which is electrically connected to the negative electrode sheet 23. The positive electrode sheets 21 in the plurality of battery cells 201 are all provided with positive electrode tabs 31, and the plurality of positive electrode tabs 31 are connected. The negative electrode sheets 23 in the plurality of battery cells 201 are all provided with negative electrode tabs 32, and the plurality of negative electrode tabs 32 are connected.

[0029] Reference Figure 4 The connection assembly is used to connect the positive tabs 31 of the multiple positive electrodes 21 or the negative tabs 32 of the multiple negative electrodes 23 on each stacked cell 20. The connection assembly includes a connection block 60 and a connection post 70 that penetrates the connection block 60. The connection block 60 is located between two like tabs 30 among the multiple positive tabs 31 or the multiple negative tabs 32 on a stacked cell 20. The outer wall of the connection post 70 is provided with a thread. The connection post 70 penetrates the tab 30 on one side of the connection block 60, the connection block 60, and the tab 30 on the other side of the connection block 60 from the outside of the multiple tabs 30, and rivets the multiple tabs 30 to the connection block 60. The connection block 60 and the connection post 70 are used to connect the positive tabs 31 of the multiple positive electrodes 21 or the negative tabs 32 of the multiple negative electrodes 23 in each stacked cell 20 to avoid the problem of unstable welding. During long-term use of the battery body 10, it is not easy to loosen and cause an increase in the internal resistance of the battery body 10.

[0030] Further, refer to Figure 4 There are two connecting posts 70 on each connecting block 60 .

[0031] Further, refer to Figure 4 , connecting pieces 80 are provided on the two opposite outer sides of the connecting block 60, and the connecting piece 80 is located on the side of the pole ear 30 away from the connecting block 60. A threaded hole is penetrated in the connecting piece 80, and the connecting column 70 is penetrated in sequence by the connecting piece 80 and the pole ear 30 on one side of the connecting block 60, the connecting block 60, and the pole ear 30 and connecting piece 80 on the other side of the connecting block 60. The thread on the connecting column 70 is threadedly connected with the inner wall of the threaded hole of the connecting piece 80 to lock the connecting column 70 and the connecting piece 80.

[0032] Reference Figure 4A busbar 90 is provided on the connection block 60 at the positive electrode sheet 21 or the negative electrode sheet 23 of two adjacent laminated battery cells 20. The busbar 90 is used to connect the connection blocks 60 at the positive electrode sheet 21 of two adjacent laminated battery cells 20 or the connection blocks 60 at the negative electrode sheet 23 of two adjacent laminated battery cells 20, so as to connect each laminated battery cell 20 in series or in parallel to form a battery body 10. The busbar 90 is used to connect the connection blocks 60 of two adjacent laminated battery cells 20, and the busbar 90 is provided with bolts 91 at the position of the connection blocks 60 of the two adjacent laminated battery cells 20. The bolts 91 are used to connect the two connection blocks 60 to the busbar 90 to form a busbar. A through hole 92 is provided in the middle position of the busbar 90, and the through hole 92 is used to fix the busbar 90 in the shell 11 by bolts.

[0033] Further, refer to Figure 4 A first threaded hole 61 for the positive electrode column 40 to pass through is provided on the connecting block 60 at the positive electrode sheet 21 below the positive electrode column 40. A bolt is provided at the lower end of the positive electrode column 40. The lower end of the positive electrode column 40 passes through the connecting block 60 through the first threaded hole 61. The bolt at the lower end of the positive electrode column 40 is threadedly connected to the inner wall of the first threaded hole 61, so that the positive electrode ear 31 of the positive electrode sheet 21 is connected to the positive electrode column 40 to form a positive electrode.

[0034] Reference Figure 4 A second threaded hole 62 for the negative electrode column 50 to pass through is provided on the connecting block 60 at the negative electrode sheet 23 below the negative electrode column 50. A bolt is provided at the lower end of the negative electrode column 50. The lower end of the negative electrode column 50 passes through the connecting block 60 through the second threaded hole 62. The bolt at the lower end of the negative electrode column 50 is threadedly connected to the inner wall of the second threaded hole 62, so that the negative electrode ear 32 of the negative electrode sheet 23 forms a negative electrode with the negative electrode column 50.

[0035] Reference Figure 2 The battery body 10 also includes an electrolyte, which infiltrates the multiple laminated battery cells 20 in the battery body 10 .

[0036] The battery is connected to the positive tabs 31 of multiple positive plates 21 or the negative tabs 32 of multiple negative plates 23 in each stacked battery cell 20 by providing a connecting assembly to avoid the problem of unstable welding. It is not easy for the battery body 10 to loosen under long-term use, thereby increasing the internal resistance of the battery body 10. When the battery body 10 is connected to the positive electrode column 40 and the negative electrode column 50, the positive electrode column 40 and the negative electrode column 50 are passed through the corresponding connecting blocks 60 below them to form the positive and negative electrodes of the battery body 10. In addition to welding, the positive tab 31 and the negative tab 32 are correspondingly connected to the positive electrode column 40 and the negative electrode column 50 through the connecting assembly, thereby ensuring the stability of the connection and reducing the internal resistance of the battery body 10.

[0037] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person of ordinary skill in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A laminated battery with reduced internal resistance, characterized in that: include: A battery body (10) is provided, wherein the battery body (10) contains a plurality of laminated battery cells (20), wherein the laminated battery cells (20) include a plurality of positive electrode sheets (21), a diaphragm (22) and a negative electrode sheet (23) stacked in sequence, wherein the positive electrode sheet (21) and the negative electrode sheet (23) are both provided with a pole ear (30), wherein the pole ear (30) provided on the positive electrode sheet (21) is a positive pole ear (31), and the pole ear (30) provided on the negative electrode sheet (23) is a negative pole ear (32), wherein a connecting assembly is provided in the battery body (10), wherein each laminated battery cell (20) is provided with two connecting assemblies, and the two connecting assemblies are provided with a connecting assembly. The components are respectively connected to the positive pole ears (31) of the plurality of positive pole sheets (21) and the negative pole ears (32) of the plurality of negative pole sheets (23); a positive pole column (40) and a negative pole column (50) are provided on the top of the battery body (10); the connecting component at the positive pole sheet (21) of the laminated battery core (20) below the positive pole column (40) is connected to the positive pole column (40) to form the positive pole of the battery body (10); the connecting component at the negative pole sheet (23) of the laminated battery core (20) below the negative pole column (50) is connected to the negative pole column (50) to form the negative pole of the battery body (10).

2. A laminated battery with reduced internal resistance according to claim 1, characterized in that: The battery body (10) comprises a shell (11), the top end of the shell (11) is open, a plurality of accommodating cavities (111) are provided in the shell (11), and a plurality of the laminated battery cells (20) are sequentially accommodated in the plurality of accommodating cavities (111).

3. A laminated battery with reduced internal resistance according to claim 2, characterized in that: The top cover of the shell (11) is provided with a cover body (12), the positive electrode column (40) and the negative electrode column (50) are both located on the cover body (12), and the lower ends of the positive electrode column (40) and the negative electrode column (50) pass through the cover body (12) and extend into the shell (11) to be connected to the corresponding connecting components of the positive electrode sheet (21) and the connecting components of the negative electrode sheet (23), respectively.

4. A laminated battery with reduced internal resistance according to claim 3, characterized in that: Each of the laminated battery cells (20) comprises a plurality of battery cell units (201) stacked in layers, wherein the battery cell units (201) comprise a positive electrode sheet (21), a separator (22) and a negative electrode sheet (23) stacked in sequence.

5. The laminated battery with reduced internal resistance according to claim 4, characterized in that: The connection assembly comprises a connection block (60) and a connection column (70) passing through the connection block (60); the connection block (60) is located between two of the same-sex pole tabs (30) among a plurality of positive pole tabs (31) or negative pole tabs (32) on a laminated battery cell (20); the outer wall of the connection column (70) is provided with a thread; the connection column (70) passes through the pole tab (30) on one side of the connection block (60), the connection block (60), and the pole tab (30) on the other side of the connection block (60) in sequence from the outside of the plurality of pole tabs (30); the connection column (70) connects and fixes the plurality of pole tabs (30) to the connection block (60).

6. The laminated battery with reduced internal resistance according to claim 5, characterized in that: The two opposite outer sides of the connecting block (60) are both provided with connecting pieces (80), the connecting piece (80) is located on the side of the pole lug (30) away from the connecting block (60), and a threaded hole is penetrated in the connecting piece (80), and the connecting column (70) is penetrated in sequence through the connecting piece (80) and the pole lug (30) on one side of the connecting block (60), the connecting block (60), and the pole lug (30) and the connecting piece (80) on the other side of the connecting block (60), and the thread on the connecting column (70) is threadedly connected to the inner wall of the threaded hole of the connecting piece (80).

7. The laminated battery with reduced internal resistance according to claim 6, characterized in that: A busbar (90) is provided on the connection blocks (60) at the positive electrode sheets (21) or the negative electrode sheets (23) of two adjacent laminated battery cells (20). The busbar (90) is used to connect the connection blocks (60) at the positive electrode sheets (21) of two adjacent laminated battery cells (20) or the connection blocks (60) at the negative electrode sheets (23) of two adjacent laminated battery cells (20). Bolts (91) are penetrated through the busbar (90) at positions relative to the two connection blocks (60). A through hole (92) is provided in the middle of the busbar (90) for fixing the busbar (90) in the housing (11) by means of bolts.

8. The laminated battery with reduced internal resistance according to claim 6, characterized in that: A first threaded hole (61) is provided on the connecting block (60) at the positive electrode sheet (21) below the positive electrode column (40). The first threaded hole (61) is used for the positive electrode column (40) to pass through. A bolt is provided at the lower end of the positive electrode column (40) and is threadedly connected to the inner wall of the first threaded hole (61).

9. The laminated battery with reduced internal resistance according to claim 6, characterized in that: A second threaded hole (62) is provided on the connection block (60) at the negative electrode sheet (23) below the negative electrode column (50). The second threaded hole (62) is used for the negative electrode column (50) to pass through. A bolt is provided at the lower end of the negative electrode column (50) and is threadedly connected to the inner wall of the second threaded hole (62).

10. The laminated battery with reduced internal resistance according to claim 1, characterized in that: The battery body (10) includes an electrolyte, and the electrolyte infiltrates the plurality of laminated battery cells (20) in the battery body (10).

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