CN219321568U

CN219321568U - Battery cell

Info

Publication number: CN219321568U
Application number: CN202320058800.3U
Authority: CN
Inventors: 黄志伟; 罗自皓; 曾思翰; 程言芳
Original assignee: Zhuhai Cosmx Power Co Ltd
Current assignee: Zhuhai Cosmx Power Co Ltd
Priority date: 2023-01-04
Filing date: 2023-01-04
Publication date: 2023-07-07
Anticipated expiration: 2033-01-04

Abstract

A battery, comprising: at least two electric cores and a battery protection circuit electrically connected with the electric cores; the battery protection circuit comprises a first circuit board and a second circuit board which are stacked along a first direction, wherein the first circuit board is electrically connected with the second circuit board through a third circuit board, a power circuit device and a tab soldering lug are arranged on the first circuit board, the tab soldering lug is connected with a tab of the battery cell, and a control circuit device is arranged on the second circuit board. According to the utility model, the battery protection circuit is designed into a multi-layer structure which is laminated along the first direction, so that the space occupation of the battery protection circuit on a plane is reduced, the space utilization rate is better, the volume ratio of the battery core in the battery is increased by saving the size, thereby improving the energy density of the battery, and meanwhile, different types of devices are distributed on different circuit boards, thereby effectively avoiding thermal interference, being more beneficial to the overall heat dissipation of the battery, prolonging the service life of components and improving the stability of the devices.

Description

Battery cell

Technical Field

The utility model belongs to the technical field of batteries, and particularly relates to a battery with a plurality of battery cells and a protection circuit.

Background

With the continuous improvement of the performance of consumer electronic products, the power consumption of the consumer electronic products is also increased. Lithium ion batteries are used as energy storage components of electronic products, are limited by own chemical system laws, and currently, the capacity and the energy density are difficult to be greatly improved. Therefore, how to increase the volume ratio of the battery cell as much as possible under the existing space size becomes one of the problems to be solved in the technical field of battery packaging. In addition, how to prevent other components from being affected by the temperature field of the components which are arranged on the circuit board and generate heat is also a problem to be considered.

Disclosure of Invention

The utility model aims to provide a battery which can improve the volume ratio of an electric core in the battery and improve the energy density of the battery.

In order to achieve the above object, the present utility model adopts the following technical solutions:

a battery, comprising: at least two electric cores and a battery protection circuit electrically connected with the electric cores; the battery protection circuit comprises a first circuit board and a second circuit board which are stacked along a first direction, wherein the first circuit board is electrically connected with the second circuit board through a third circuit board, a power circuit device and a tab soldering lug are arranged on the first circuit board, the tab soldering lug is connected with a tab of the battery cell, and a control circuit device is arranged on the second circuit board.

The battery as described above, optionally, the Power loop device includes at least one of an R-sense device, a Fuse device, and a Power MOS device; the control loop device comprises at least one of a Gauge IC device, an IC device and an NTC device.

The battery as described above, optionally, the first circuit board, the second circuit board and the third circuit board are hard circuit boards, the third circuit board is disposed between the first circuit board and the second circuit board, and a hole welding plate for electrically connecting with the first circuit board and the second circuit board is disposed on the third circuit board.

As mentioned above, optionally, the third circuit board is provided with a hollow in the middle, and the projection of the first circuit board and/or the component on the second circuit board on the plane where the third circuit board is located within the projection range of the hollow on the same plane.

As described above, optionally, the third circuit board is provided with a ground via on the outer side.

As described above, optionally, the first circuit board and the second circuit board are hard circuit boards, and the third circuit board is a flexible circuit board.

The battery as described above, optionally, the third circuit board is partially pressed inside the first circuit board and the second circuit board; or the third circuit board is in welded connection with the first circuit board and the second circuit board.

As mentioned above, optionally, the battery cells are disposed on two sides of the battery protection circuit in a mode of being opposite to each other, and the tabs of the battery cells extend toward the battery protection circuit.

The battery, optionally, further comprises a battery support and a connector, wherein the battery support is provided with a hollowed-out part for placing the battery core and a protection circuit installation part for fixing the battery protection circuit, and the connector is electrically connected with the first circuit board.

The battery as described above, optionally, further comprises an insulation film and an insulation label respectively arranged on two side surfaces of the battery support, wherein the insulation film and the insulation label cover the surfaces of the battery core and the battery support.

According to the technical scheme, the battery protection circuit adopts a laminated structure, the two layers of circuit boards provided with the components are connected together after being stacked through the third circuit board, so that the space in the first direction of the battery is fully utilized, the size of the battery protection circuit on a plane is reduced, the occupation of the battery protection circuit in the width and/or length direction of the battery is reduced, the volume occupation ratio of the battery core is improved, and the effect of improving the energy density of the battery is achieved. The battery protection circuit adopts a double-layer circuit board structure, is more beneficial to the dispersion arrangement of devices on the circuit board, ensures that the heat distribution of the circuit is more uniform, the safety is better, the service life and the stability of the devices are better, and the battery has remarkable advantages in the aspects of cost, capacity, device power density and the like.

Drawings

In order to more clearly illustrate the embodiments of the present utility model, the following description will briefly explain the embodiments or the drawings required for the description of the prior art, it being obvious that the drawings in the following description are only some embodiments of the present utility model and that other drawings may be obtained according to these drawings without inventive effort to a person skilled in the art.

Fig. 1 is a schematic view of the battery according to embodiment 1 of the present utility model;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

fig. 3 is an exploded view of the battery according to embodiment 1 of the present utility model;

fig. 4 is a schematic diagram showing connection between a battery cell and a battery protection circuit according to embodiment 1 of the present utility model;

fig. 5 is an exploded view of the battery protection circuit according to embodiment 1 of the present utility model;

fig. 6 is a schematic diagram showing connection between a battery cell and a battery protection circuit according to embodiment 2 of the present utility model;

FIG. 7 is an enlarged schematic view of a portion A of FIG. 6;

fig. 8 is a schematic diagram showing connection between a battery cell and a battery protection circuit according to embodiment 3 of the present utility model;

fig. 9 is a partially enlarged schematic view of the portion B in fig. 8.

The following describes the embodiments of the present utility model in further detail with reference to the drawings.

Detailed Description

In describing embodiments of the present utility model in detail, the drawings showing the structure of the device are not to scale locally for ease of illustration, and the schematic illustrations are merely examples, which should not limit the scope of the utility model. It should be noted that the drawings are in simplified form and are not to scale precisely, but rather are merely intended to facilitate and clearly illustrate the embodiments of the present utility model. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance or implying the number of technical features indicated; the terms "forward," "reverse," "bottom," "upper," "lower," and the like are used for convenience in describing and simplifying the description only, and do not denote or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the utility model.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, or can be communicated inside the two components, or can be connected wirelessly or in a wired way. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Example 1

As shown in fig. 1, 2, 3 and 4, the battery of the present embodiment includes at least two battery cells 1 and a battery protection circuit 2 electrically connected to the battery cells 1. The electrode lugs 1-1 of the battery cells 1 are electrically connected with the battery protection circuit 2, the battery cells 1 are connected in series or in parallel through the battery protection circuit 2 to form a battery pack, and the battery cells 1 are correspondingly adjusted according to the voltage and the current required by the product by adopting parallel connection or series connection, so that the battery pack is not limited. The battery of this embodiment includes 4 electric cores, and electric core 1 arranges in the both sides of battery protection circuit 2 with the mode of two-by-two setting, and the utmost point ear 1-1 of electric core 1 extends towards battery protection circuit 2 to overlap joint on the utmost point ear lug 2-1 of battery protection circuit 2, utmost point ear 1-1 can be through laser welding or resistance welding etc. mode and the utmost point ear lug 2-1 of battery protection circuit 2 link together, and utmost point ear lug 2-1 of this embodiment is the nickel piece.

In some embodiments, the battery further comprises a battery holder 3, an insulating film 4, an insulating label 5 and a connector 6, wherein the connector 6 is connected with the battery protection circuit 2 for realizing external output of the battery. The battery holder 3 is made of an insulating fireproof material such as fireproof plastic, and the insulating film 4 and the insulating tag 5 are also made of a fireproof insulating material. The battery support 3 is provided with a hollow 3-1 for placing the battery cell 1 and a protection circuit mounting part (not shown) for fixing the battery protection circuit 2, the battery cell 1 is fixed in the hollow 3-1 of the battery support 3, and the battery support 3 can play a role in fixing and protecting the battery cell 1. The insulating film 4 and the insulating label 5 are respectively arranged on the two side surfaces of the battery bracket 3, and cover the surfaces of the battery cell 1 and the battery bracket 3 respectively.

The battery cells 1 positioned at both sides of the battery protection circuit 2 are stacked in a first direction, and the first direction of the present utility model refers to a direction perpendicular to a plane in which the battery cells 1 are positioned. In order to improve the volume ratio of the battery cell, the utility model designs a stacked battery protection circuit. Referring to fig. 2 and 5, the battery protection circuit 2 of the present embodiment includes a first circuit board 2-2, a second circuit board 2-3, and a third circuit board 2-4, where the first circuit board 2-2 and the second circuit board 2-3 are stacked along a first direction, and the third circuit board 2-4 is used to realize physical connection and electrical connection between the first circuit board 2-2 and the second circuit board 2-3. The first circuit board 2-2, the second circuit board 2-3 and the third circuit board 2-4 in this embodiment are hard circuit boards (Printed Circuit Board, abbreviated as PCBs), the third circuit board 2-4 is located between the first circuit board 2-2 and the second circuit board 2-3, and a hollow is disposed in the middle of the third circuit board 2-4, so as to facilitate the arrangement of components on the circuit board, and the components on the first circuit board and/or the second circuit board can be disposed in the hollow (for example, the projection of the components on the first circuit board and/or the second circuit board on the plane where the third circuit board is located in the projection range of the hollow on the same plane), so as to avoid interference with the third circuit board 2-4. The third circuit board 2-4 is provided with hole bonding pads 2-4a for electrically connecting the first circuit board 2-2 and the second circuit board 2-3, and the first circuit board and the second circuit board carrying components are stacked in a lamination welding mode.

The first circuit board 2-2 of the embodiment is used for carrying a Power supply loop device, the Power supply loop device comprises one or more of Power devices such as an R-sense device 2-2a, a Fuse device 2-2b, a Power MOS device 2-2c, and the like, and the tab welding lug 2-1 is also arranged on the first circuit board 2-2, so that the first circuit board 2-2 is also used for connecting a battery cell and carrying charge and discharge current. The connector 6 is also electrically connected to the first circuit board 2-2 through a connector pad 2-2d provided on the first circuit board 2-2. The second circuit board 2-3 is used for carrying a control loop device, and the control loop device comprises one or more logic devices of a Gauge IC device 2-3a, an IC device 2-3b, an NTC device 2-3c and the like. The third circuit board 2-4 with the hollow middle is adopted, and current is enclosed in the third circuit board 2-4, so that the effect of shielding electromagnetic interference can be achieved by arranging a grounding via hole on the outer side of the third circuit board 2-4.

As shown in fig. 4, the first circuit board 2-2, the third circuit board 2-4 and the second circuit board 2-3 are sequentially stacked along the first direction to form the battery protection circuit 2, and the tab 1-1 of the battery core 1 and the tab soldering tab 2-1 on the first circuit board-2 are connected together. According to the utility model, the battery protection circuit is designed into a multi-layer structure which is laminated along the first direction, so that the space occupation of the battery protection circuit on a plane is reduced, the space utilization rate is better, the volume ratio of the battery core in the battery is increased due to the saved size, and the energy density of the battery is improved. In addition, the two circuit boards respectively bear a power supply loop device, a tab soldering lug and a control loop device, so that a temperature probe of the battery can be separated from a power device, a tab soldering lug and other heavy current carriers in the power supply loop, the thermal interference can be effectively avoided, and the detection precision is improved; meanwhile, the power devices and the logic devices are distributed on the two circuit boards, so that excessive concentration of the components on a single plane can be avoided, the distance between the heating components is increased, the problem that the power density is too high in a small range due to the fact that the temperatures of the heating components are mutually overlapped due to the fact that the distances between the components are too close is avoided, and the whole heat dissipation of the battery is facilitated, and the service life and stability of the components are prolonged.

Example 2

As shown in fig. 6 and 7, the difference between the present embodiment and embodiment 1 is that the connection between the third circuit board 2-4 and the first circuit board 2-2 and the second circuit board 2-3 in the battery protection circuit of the present embodiment is a soft-hard combination (rgid-Flex PCB). The third circuit board 2-4 of the present embodiment is a flexible circuit board (Flexible Printed Circuit, abbreviated as FPC), and the flexible circuit board is partially pressed inside the rigid circuit board. The electrical and physical connection between the first circuit board 2-2 and the second circuit board 2-3, which are stacked in the first direction, is achieved by the flexible connection characteristic of the flexible circuit board, which is bendable.

Example 3

As shown in fig. 8 and 9, the difference between the present embodiment and embodiment 2 is that the third circuit board 2-4 and the first circuit board 2-2 and the second circuit board 2-3 in the battery protection circuit of the present embodiment are also in a soft and hard combination mode, but the hard circuit boards (the first and second circuit boards) and the flexible circuit board (the third circuit board) are in a form of mutual welding, and the circuit board bonding pads 2-4b are arranged on the flexible circuit board, and are connected with the first circuit board 2-2 and the second circuit board 2-3 by soldering or the like.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery, comprising: at least two electric cores and a battery protection circuit electrically connected with the electric cores; the method is characterized in that:

the battery protection circuit comprises a first circuit board and a second circuit board which are stacked along a first direction, wherein the first circuit board is electrically connected with the second circuit board through a third circuit board, a power circuit device and a tab soldering lug are arranged on the first circuit board, the tab soldering lug is connected with a tab of the battery cell, and a control circuit device is arranged on the second circuit board.

2. The battery of claim 1, wherein: the Power supply loop device comprises at least one of an R-sense device, a Fuse device and a Power MOS device; the control loop device comprises at least one of a GaugeIC device, an IC device and an NTC device.

3. The battery of claim 1, wherein: the first circuit board, the second circuit board and the third circuit board are hard circuit boards, the third circuit board is arranged between the first circuit board and the second circuit board, and a hole welding plate for being electrically connected with the first circuit board and the second circuit board is arranged on the third circuit board.

4. A battery as claimed in claim 3, wherein: the third circuit board is provided with a hollow in the middle, and the projection of the first circuit board and/or the components on the second circuit board on the plane where the third circuit board is located in the projection range of the hollow on the same plane.

5. The battery of claim 4, wherein: and the outer side of the third circuit board is provided with a grounding via hole.

6. The battery of claim 1, wherein: the first circuit board and the second circuit board are hard circuit boards, and the third circuit board is a flexible circuit board.

7. The battery of claim 6, wherein: the third circuit board part is pressed inside the first circuit board and the second circuit board; or the third circuit board is in welded connection with the first circuit board and the second circuit board.

8. The battery of claim 1, wherein: the battery cells are arranged on two sides of the battery protection circuit in a pairwise opposite mode, and the lugs of the battery cells extend to the battery protection circuit.

9. The battery of claim 1, wherein: the battery protection device comprises a battery support and a connector, wherein the battery support is provided with a hollowed-out part for placing a battery core and a protection circuit installation part for fixing a battery protection circuit, and the connector is electrically connected with a first circuit board.

10. The battery of claim 9, wherein: the battery pack also comprises an insulating film and an insulating label which are respectively arranged on the two side surfaces of the battery support, wherein the insulating film and the insulating label are covered on the surfaces of the battery core and the battery support.