Battery and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery and a battery pack. The battery has a first direction and a second direction which intersect with each other, and the battery comprises: a battery cell group comprising at least two battery cells arranged side by side along the first direction, each battery cell having a tab side and a non-tab side; the protection circuit module is arranged on the tab side and comprises a first circuit board and at least two second circuit boards, the thickness directions of the second circuit boards and the first circuit board are parallel to the second direction, and the at least two second circuit boards are arranged corresponding to the tab sides of the at least two battery cells; the first circuit board stretches across the tab sides of at least two adjacent battery cells and is connected with at least two adjacent second circuit boards, and in the battery cell group, an avoiding space is formed between the two second circuit boards corresponding to the side packaging piece in the middle part of any two adjacent battery cells. The avoiding space can avoid the packaging structure in the middle of the two adjacent battery cells, the length of the battery cells in the second direction can be reduced, and a design space is reserved for capacity increasing of the battery cells.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to batteries and battery packs. Background Technology

[0002] With the increasing demand for battery capacity, batteries require significant stacking space along their length. To reduce this length, dual-cell designs utilize two cells connected in series or parallel. Series connection results in a higher voltage than a single-cell design, facilitating high-current super-fast charging. Parallel connection maintains the same voltage while increasing battery capacity and extending range. However, the dual-cell design increases PCB width to accommodate more electronic components. Since the side seals of the cells cannot be bent, a protrusion exists between the two cells. When the PCB is placed perpendicular to the top surface of the cells, this interference affects the overall battery length. Utility Model Content

[0003] In view of this, the present invention provides a battery and a battery pack to solve the problem that placing the top surface of the vertical battery cell on the PCB board affects the overall length of the battery.

[0004] In a first aspect, the present invention provides a battery having intersecting first and second directions. The battery includes: a cell pack including at least two cells arranged side-by-side along the first direction, each cell having a tab side and a non-tab side arranged along the second direction; and a protection circuit module disposed on the tab side. The protection circuit module includes a first circuit board and at least two second circuit boards, the thickness directions of the second circuit boards and the first circuit board being parallel to the second direction. The at least two second circuit boards are disposed corresponding to the tab sides of the at least two cells. The first circuit board spans across the tab sides of at least two adjacent cells and is connected to at least two adjacent second circuit boards. A clearance space is formed between two second circuit boards corresponding to the side encapsulation of the middle portion of any two adjacent cells. The clearance space is used to avoid the side encapsulation of the middle portion of the two adjacent cells.

[0005] Beneficial effects: A second circuit board is provided on the tab side of each cell, and two adjacent second circuit boards are flexibly connected through a first circuit board. The thickness direction of the second circuit board and the first circuit board is parallel to the second direction Y. In the cell assembly, a clearance space is formed between two second circuit boards corresponding to the side package of the middle part of any two adjacent cells. The clearance space can avoid the package structure of the middle part of the two adjacent cells, so that the second circuit board can avoid the edge part of the top package and the top of the middle package of the cell assembly. This can reduce the length of the cell in the second direction, leave design space for cell capacity increase, and improve the energy density of the battery.

[0006] In one alternative embodiment, the first circuit board is disposed on the side of the second circuit board away from the battery cell, and the second circuit board is disposed on the side facing the battery cell, where the first type of components are disposed.

[0007] Beneficial effects: The first type of components are set on the side of the second circuit board facing the battery cell, making full use of the space between the second circuit board and the top surface of the battery cell, thereby improving the space utilization rate of the battery.

[0008] In one alternative embodiment, the first circuit board has a first surface facing the battery cell. The battery cell includes a battery cell body and a packaging structure that encapsulates the battery cell body. The first surface, the second circuit board, and the packaging structure enclose a mounting space. A second type of component located in the mounting space is fixed on the first surface. The height of the second type of component along a second direction is higher than the height of the first type of component.

[0009] Beneficial effects: Since the thickness of the second circuit board is greater than that of the first circuit board, the taller second-type components are placed on the first circuit board, and the shorter first-type components are placed on the second circuit board. In the second direction, the space utilization of the battery in the length direction is optimized, thereby making more efficient use of the limited space.

[0010] In one alternative embodiment, the first circuit board has a second surface facing away from the second circuit board, and the second surface is provided with solder tabs for soldering to the tabs of the battery cell.

[0011] Beneficial effect: By welding the welding tabs to the battery cell, the welding reliability of the first circuit board and the tabs is improved.

[0012] In one alternative embodiment, the thickness of the welding sheet is 0.1mm-0.5mm.

[0013] Beneficial effects: The thickness of the welded sheet is 0.1mm-0.5mm. The 0.1mm welded sheet has the advantages of being lightweight, flexible, and space-saving. The 0.2mm to 0.3mm welded sheet has the advantages of good conductivity, enhanced mechanical strength, and ease of welding. The 0.4mm to 0.5mm welded sheet has the advantages of high mechanical strength, high current carrying capacity, stable electrical performance, vibration and shock resistance, and durability.

[0014] In one alternative embodiment, the first circuit board has a second surface facing away from the second circuit board, and the second surface is provided with a reinforcing sheet corresponding to the portion between two adjacent second circuit boards.

[0015] Beneficial effect: A reinforcing plate is placed in the middle part of the first circuit board to improve the flatness and strength of the protection circuit module.

[0016] In one alternative embodiment, a first circuit board is disposed on the side of the second circuit board facing the battery cell, and components are disposed on the side of the second circuit board facing away from the battery cell. Along the second direction, the side of the first circuit board facing away from the battery cell is not higher than the side of the components facing away from the battery cell.

[0017] Beneficial effect: The height of the first circuit board does not exceed the height of the components and does not affect the length of the battery.

[0018] In one alternative implementation, the thickness of the first circuit board is 0.2mm-0.4mm.

[0019] Beneficial effects: The thickness of the first circuit board can meet the requirements of high-current products. The first circuit board provides a good balance between lightweight, mechanical strength, flexibility and electrical performance, and is suitable for a variety of electronic devices and complex environments.

[0020] In one alternative embodiment, an injection molded part is injection molded on the tab side, the injection molded part encapsulates the tab of the protective circuit module and the battery cell, and / or, the second circuit board and the components disposed on the second circuit board are encapsulated by a plastic encapsulation process.

[0021] Beneficial effects: After the protection circuit module is welded to the battery cell's tabs, the battery head is injection molded to prevent the first circuit board from rebounding and deforming, thereby increasing the strength of the battery head and effectively preventing battery failure from drops.

[0022] Secondly, this utility model also provides a battery pack, including the aforementioned battery. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a perspective view of a battery according to an embodiment of the present utility model;

[0025] Figure 2 for Figure 1 An exploded view of the battery shown.

[0026] Figure 3 for Figure 2 A 3D view of the protection circuit module shown;

[0027] Figure 4 for Figure 2 The image shows an exploded view of the battery from another angle;

[0028] Figure 5 for Figure 1 A top view of the battery shown;

[0029] Figure 6 for Figure 5 The battery shown is shown as a top cross-sectional view along the CC direction;

[0030] Figure 7 for Figure 1 The front view of the battery cell assembly and protection circuit module shown;

[0031] Figure 8 for Figure 7 A schematic diagram of the upper part of the battery cell assembly and protection circuit module shown;

[0032] Figure 9 for Figure 1 A 3D view of the battery cell shown;

[0033] Figure 10 for Figure 9 The battery cell shown is a three-dimensional view from another angle;

[0034] Figure 11 This is a front view of another battery protection circuit module according to an embodiment of the present utility model;

[0035] Figure 12 for Figure 11 The front view of the protection circuit module and the encapsulant shown.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Battery cell assembly; 101. Battery cell; 1011. Battery cell body; 10111. Electrode; 1012. Packaging structure; 10121. Top seal; 10122. First side seal; 10123. Second side seal;

[0038] 2. Protection circuit module; 201. Second circuit board; 202. First circuit board; 2021. Horizontal plate; 2022. Output board; 20221. First vertical section; 20222. Horizontal section; 20223. Second vertical section; 203. First type of components; 204. Second type of components; 205. Welding piece; 206. Reinforcing piece;

[0039] 3. Injection molded parts;

[0040] 401. Side insulating tape; 402. Bottom insulating tape; 403. Top insulating tape; 404. Fixing tape;

[0041] 5. Easy-open adhesive;

[0042] 6. Lifting handle;

[0043] 7. Plastic sealant. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0045] The following is combined Figures 1 to 12 The following describes embodiments of the present invention.

[0046] According to an embodiment of the present invention, a battery is provided having intersecting first direction X and second direction Y. The battery includes: a cell pack 1 and a protection circuit module 2.

[0047] Specifically, the battery cell assembly 1 includes at least two battery cells 101, which are arranged side by side along a first direction X, and each battery cell 101 has a tab side and a non-tab side arranged along a second direction Y.

[0048] The protection circuit module 2 is disposed on the tab side. The protection circuit module 2 includes a first circuit board 202 and at least two second circuit boards 201. The thickness directions of the second circuit boards 201 and the first circuit board 202 are parallel to the second direction Y. The at least two second circuit boards 201 are disposed one-to-one with the tab side of at least two battery cells 101. The first circuit board 202 spans across the tab side of at least two adjacent battery cells 101 and is connected to at least two adjacent second circuit boards 201. A clearance space is formed between the two second circuit boards 201 corresponding to the side package of the middle part of any two adjacent battery cells 101. The clearance space is used to avoid the side package of the middle part of the two adjacent battery cells 101.

[0049] In the battery of this embodiment, a second circuit board 201 is provided on the tab side of each cell 101. Two adjacent second circuit boards 201 are flexibly connected through a first circuit board 202. The thickness direction of the second circuit board 201 and the first circuit board 202 is parallel to the second direction Y. In the cell group 1, a clearance space is formed between two second circuit boards 201 corresponding to the side package of the middle part of any two adjacent cells 101. The clearance space can avoid the side package of the middle part of two adjacent cells 101, so that the second circuit board 201 can avoid the edge part of the top seal 10121 and the top of the middle seal of the cell group 1. This can reduce the length of the cell 101 in the second direction, leave design space for increasing the capacity of the cell 101, and improve the energy density of the battery.

[0050] Specifically, the first circuit board 202 is provided at least corresponding to the edge portion of the top seal 10121 and the top of the middle side seal. The battery cell 101 has a top surface and a bottom surface arranged along the second direction. The thickness direction of the second circuit board 201 and the first circuit board 202 is perpendicular to the top surface, which can shorten the length of the battery, save the length space of the battery, and thus improve the energy density of the battery.

[0051] Furthermore, the thickness of the first circuit board 202 is less than the thickness of the second circuit board 201.

[0052] It should be noted that the side where the tab 10111 of the battery cell 101 is located is the top side, and the other side of the battery cell 101 opposite to the tab 10111 is the bottom side.

[0053] Furthermore, the battery also has a third direction Z that intersects the first direction X and the second direction Y in pairs. The first direction is the width direction of the cell 101, the second direction is the length direction of the cell 101, and the third direction is the thickness direction of the cell 101.

[0054] Specifically, there are two cells 101, and the battery adopts a dual-cell design.

[0055] It is understood that, in another embodiment, the number of battery cells 101 in battery cell group 1 may also be three, four, etc., and the number of battery cells 101 may be selected according to specific needs.

[0056] In one embodiment, a second circuit board 201 is disposed on the tab side of a battery cell 101.

[0057] It is understood that in another embodiment, two or more second circuit boards 201 are provided on the tab side of a battery cell 101. In this case, only the two second circuit boards corresponding to the side package of the middle part of the two battery cells 101 form a clearance space, and no clearance space is formed between the two or more second circuit boards corresponding to a battery cell.

[0058] In one embodiment, such as Figure 3 and Figure 8 As shown, the first circuit board 202 is disposed on the side of the second circuit board 201 facing away from the battery cell 101, and a first type of component 203 is disposed on the side of the second circuit board 201 facing the battery cell 101. The first type of component 203 is disposed on the side of the second circuit board 201 facing the battery cell 101, making full use of the space between the top surface of the second circuit board 201 and the battery cell 101, thereby improving the space utilization rate of the battery.

[0059] In one embodiment, such as Figures 9 to 11As shown, the first circuit board 202 has a first surface facing the battery cell 101. The battery cell 101 includes a battery cell body 1011 and a packaging structure 1012 that encapsulates the battery cell body 1011. The first surface, the second circuit board 201, and the packaging structure 1012 enclose a mounting space. A second type of component 204 located in the mounting space is fixed on the first surface. The height of the second type of component 204 along the second direction Y is higher than the height of the first type of component 203. Since the thickness of the second circuit board 201 is greater than the thickness of the first circuit board 202, the higher-height second type of component 204 is placed on the first circuit board 202, and the lower-height first type of component 203 is placed on the second circuit board 201. In the second direction, the space utilization of the battery in the length direction is optimized, thereby making more efficient use of the limited space.

[0060] Furthermore, the packaging structure 1012 has a top seal 10121, two first side seals 10122 and a second side seal 10123. The two first side seals 10122 are disposed on both sides of the cell body 1011 along a first direction. The top seal 10121 is disposed on the tab side of the cell body 1011. The second side seal 10123 is connected to the top seal 10121 and the two first side seals 10122. The second side seal 10123 is perpendicular to the first side seals 10122. When two cells 101 are arranged side by side, two first side seals 10122 are disposed between two adjacent cell bodies 1011. At this time, the two first side seals 10122 between the two cell bodies 1011 can also be called intermediate seals.

[0061] Specifically, the top seal 10121 has a straight section extending along a first direction and arc-shaped sections disposed on both sides of the straight section along the first direction. The second circuit board 201 is disposed above the straight section. The second circuit board 201 can avoid the arc-shaped sections and the protrusion of the intermediate seal protruding from the top surface of the cell body 1011.

[0062] It is understood that, in another embodiment, the first circuit board 202 is disposed on the side of the second circuit board 201 facing the battery cell 101, and components are disposed on the side of the second circuit board 201 facing away from the battery cell 101. Along the second direction Y, the side of the first circuit board 202 facing away from the battery cell 101 is not higher than the side of the components facing away from the battery cell 101, that is, the height of the first circuit board 202 does not exceed the height of the components, and does not affect the length of the battery. The first circuit board 202 has an arched portion that arches towards the direction facing away from the battery cell 101, and the arched portion forms a clearance space on the side facing the battery cell, which is used to avoid the encapsulation structure in the middle part of the two battery cells.

[0063] In one embodiment, such as Figure 3 and Figure 7As shown, the first circuit board 202 has a second surface facing away from the second circuit board 201. The second surface is provided with a solder pad 205, which is used to solder to the tab 10111 of the battery cell 101. By soldering the solder pad 205 to the tab 10111 of the battery cell 101, the soldering reliability between the first circuit board 202 and the tab 10111 is improved.

[0064] Furthermore, the welding piece 205 is made of nickel or similar materials. Nickel can provide a stable substrate, prevent copper oxidation, and prevent copper from diffusing into the gold layer, thereby ensuring the long-term stability and reliability of the welding area.

[0065] Specifically, the thickness of the welding piece 205 is 0.1mm-0.5mm. The 0.1mm welding piece 205 has advantages such as lightweight, flexibility, and space saving. The 0.2mm to 0.3mm welding piece 205 has advantages such as good conductivity, enhanced mechanical strength, and ease of welding. The 0.4mm to 0.5mm welding piece 205 has advantages such as high mechanical strength, high current carrying capacity, stable electrical performance, vibration and shock resistance, and durability.

[0066] It should be noted that the choice of welding sheet 205 of different thicknesses should be determined based on the specific application requirements.

[0067] In one embodiment, the first circuit board 202 has a second surface facing away from the second circuit board 201, and a reinforcing piece 206 is provided on the portion of the second surface corresponding to the space between two adjacent second circuit boards 201. The reinforcing piece 206 is provided in the middle portion of the first circuit board 202 to improve the flatness and strength of the protection circuit module 2.

[0068] In one embodiment, the thickness of the first circuit board 202 is 0.2mm-0.4mm. The thickness of the first circuit board 202 can meet the requirements of high current products. The first circuit board 202 provides a good balance between lightweight, mechanical strength, flexibility and electrical performance, and is suitable for a variety of electronic devices and complex environments.

[0069] Furthermore, such as Figure 3 , Figure 7 , Figure 11 As shown, the first circuit board 202 includes a horizontal plate 2021 and an output plate 2022. The horizontal plate 2021 is located above the two battery cells 101 and is soldered to the two second circuit boards 201. The output plate 2022 includes a first vertical section 20221, a horizontal section 20222 and a second vertical section 20223. The horizontal section 20222 is arranged parallel to the horizontal plate 2021. The first vertical section 20221 connects the horizontal plate 2021 and the horizontal section 20222. The second vertical section 20223 is used to connect to external circuits or devices and is perpendicular to the first vertical section 20221.

[0070] In one embodiment, such as Figures 1 to 3 As shown, an injection molded part 3 is injection molded on the tab side. The injection molded part 3 encapsulates the protection circuit module 2 and the tab 10111 of the battery cell 101. After the protection circuit module 2 is soldered to the tab 10111 of the battery cell 101, the head of the battery is injection molded to prevent the first circuit board 202 from rebounding and deforming, thereby improving the strength of the battery head and effectively preventing battery failure due to drops. After the battery head is injection molded, compared with the conventional battery cell packaging method where the PCB board is perpendicular to the top surface of the battery cell, the battery in this embodiment can be shortened by 1.0 mm in length, leaving design space for increasing the capacity of the battery cell 101, saving battery length space, and thus improving the battery's energy density.

[0071] Understandably, in another embodiment, the second circuit board 201 and the components disposed on the second circuit board 201 are packaged using a plastic encapsulation process. The two second circuit boards 201 and components are first encapsulated using a plastic encapsulation process and then welded to the first circuit board 202. This can also effectively avoid the arc-shaped part raised in the middle of the top seal 10121 of the battery and the protruding part of the middle seal. After the protection circuit module 2 is welded and shaped with the cell 101, the battery can be shortened by 1.5mm in length compared to the conventional dual-cell packaging method, while improving the strength of the battery head and effectively preventing the battery and PCB from falling and failing.

[0072] Furthermore, such as Figure 12 As shown, the second circuit board 201 and components are encapsulated using SIP technology, and the components on the second circuit board 201 are wrapped with encapsulating adhesive 7.

[0073] It should be noted that the second circuit board 201 is a rigid printed circuit board (PCB), the first circuit board 202 is a flexible printed circuit board (FPC), the protection circuit module 2 is PCM, and the up and down direction refers to the second direction.

[0074] Understandably, in another embodiment, the second circuit board 201 and components are first encapsulated using the SIP process, with the components on the second circuit board 201 wrapped in encapsulating adhesive 7, and then the head of the battery is injection molded to form the injection molded part 3.

[0075] In one embodiment, such as Figure 2 and Figure 4As shown, the battery also includes side insulating tape 401, bottom insulating tape 402, top insulating tape 403, fixing tape 404, easy-pull sticker 5, and handle 6. The bottom of the cell 101 is wrapped with bottom insulating tape 402, the sides of the two cells 101 that are far apart are wrapped with side insulating tape 401, the surfaces of the two cells 101 that are close to each other are provided with fixing tape 404, and the top surface of the cell 101 and the PCM are provided with top insulating tape 403. The stability of the structure is achieved by the side insulating tape 401, bottom insulating tape 402, top insulating tape 403, and fixing tape 404, resulting in a semi-finished cell. The semi-finished battery is wrapped with handle 6 and easy-pull sticker 5 to form a finished battery.

[0076] According to an embodiment of the present invention, another aspect provides a battery pack, including the battery described above.

[0077] In one embodiment, the battery pack further includes a housing, a cover, etc., the housing having a receiving cavity, the cover sealing the receiving cavity and being connected to the housing, and the battery being disposed in the receiving cavity.

[0078] In related technologies, in dual-cell batteries, since the side seals of the cells cannot be bent, there is a protrusion in the middle of the battery. When the PCB board is placed perpendicular to the top surface of the cells, it interferes with the protrusion. As a result, the battery is longer in the length direction after encapsulation, which affects the overall length of the battery.

[0079] In this embodiment, the battery's PCM uses two PCBs connected by an FPC in the middle. By shaping the FPC, the arc-shaped portion of the top seal 10121 and the protruding portion of the middle seal can be effectively avoided. The battery is then fixed by injection molding at the head. Alternatively, the components and PCB can be encapsulated in SIP first, followed by insulation wrapping. Compared to conventional dual-cell packaging, the battery in this embodiment can be shortened by 0.6mm to 1.5mm in length, leaving design space for increasing the capacity of cell 101. This saves product length space, increases battery energy density, and improves the strength of the battery head, effectively preventing battery drop failure. The product has good strength, robustness, and high flatness, meeting the requirements of fast charging technology.

[0080] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery, characterized by, The battery has a first direction (X) and a second direction (Y) intersecting each other, and comprises: a cell group (1) comprising at least two cells (101), the at least two cells (101) being arranged side by side along the first direction (X), the cell (101) having a tab side and a non-tab side arranged along the second direction (Y); a protection circuit module (2) arranged on the tab side, the protection circuit module (2) comprising a first circuit board (202) and at least two second circuit boards (201), the thickness direction of the second circuit board (201) and the first circuit board (202) being parallel to the second direction (Y), the at least two second circuit boards (201) being arranged corresponding to the tab side of the at least two cells (101), the first circuit board (202) being arranged across the tab side of at least two adjacent cells (101) and being connected with at least two adjacent second circuit boards (201), two second circuit boards (201) corresponding to the side seal of the middle part of any two adjacent cells (101) forming an avoiding space, the avoiding space being used for avoiding the side seal of the middle part of the adjacent two cells (101).

2. The battery of claim 1, wherein, The first circuit board (202) is arranged on the side of the second circuit board (201) away from the cell (101), and the side of the second circuit board (201) facing the cell (101) is provided with first type components (203).

3. The battery of claim 2, wherein, The first circuit board (202) has a first surface facing the cell (101), the cell (101) comprises a cell body (1011) and a packaging structure (1012) packaging the cell body (1011), the first surface, the second circuit board (201) and the packaging structure (1012) form an installation space, and the first surface is fixed with second type components (204) located in the installation space, the height of the second type components (204) along the second direction (Y) being higher than the height of the first type components (203).

4. The battery of claim 2, wherein, The first circuit board (202) has a second surface away from the second circuit board (201), and the second surface is provided with a welding sheet (205) for welding with the tab of the cell (101).

5. The battery of claim 4, wherein, The thickness of the welding sheet (205) is 0.1mm-0.5mm.

6. The battery of claim 2, wherein, The first circuit board (202) has a second surface away from the second circuit board (201), and the second surface is provided with a reinforcing sheet (206) corresponding to the part between the adjacent two second circuit boards (201).

7. The battery of claim 1, wherein, The first circuit board (202) is arranged on the side of the second circuit board (201) facing the cell (101), and the side of the second circuit board (201) away from the cell (101) is provided with components, and along the second direction (Y), the side of the first circuit board (202) away from the cell (101) is not higher than the side of the components away from the cell (101).

8. The battery of any one of claims 1 to 7, wherein, The thickness of the first circuit board (202) is 0.2-0.4 mm.

9. The battery of any one of claims 1 to 7, wherein, The tab side is injection molded with an injection molded part (3), the injection molded part (3) wraps the protection circuit module and the tab of the battery cell, and / or the second circuit board (201) and components disposed on the second circuit board (201) are packaged by a plastic packaging process.

10. A battery pack, characterized by, Comprising: The battery of any one of claims 1-9.

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