Battery module and electronic equipment

Abstract

The utility model relates to a battery module and electronic equipment. The battery module comprises a shell, at least two battery cell groups and at least two tab groups, the at least two battery cell groups are arranged in the shell at intervals, and each battery cell group comprises a positive plate and a negative plate which are stacked; the at least two tab groups are arranged in the shell at intervals, and the tab groups are electrically connected with different battery cell groups respectively; wherein the shell is also provided with at least two opening groups, and each tab group respectively extends out of the shell through different opening groups. According to the embodiment of the invention, independent management of different battery cell areas in the battery module can be realized, and the aging phenomenon of the battery module is effectively delayed.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of laminated battery design, and in particular, to a battery module and an electronic device. BACKGROUND

[0002] In related technologies, a battery module is generally composed of a cell and a protection plate. The tab of the cell and the nickel sheet or nickel brick of the protection plate are welded together, and the protection plate is connected to external devices, thereby realizing charging and discharging between the battery module and the external devices.

[0003] The cell of the battery module in a common electrical device is mainly in the form of a tab winding or a laminated battery. In addition, the tabs of the same polarity inside the cell are welded to the same tab, so the tabs of the same polarity can be conductive to each other. Due to the progress of battery technology, the number of layers of the tabs of the battery is increasing, and the size of the battery is also increasing, which causes the cell to age unevenly during use, and the closer to the tab, the more serious the aging. Therefore, the current cell structure causes a significant life attenuation problem of the battery module. CONTENT OF THE INVENTION

[0004] To overcome the problems in the related art, the present disclosure provides a battery module and an electronic device. The embodiments of the present disclosure can realize independent management of different cell regions in the battery module, and effectively delay the aging phenomenon of the battery module.

[0005] According to a first aspect of an embodiment of the present disclosure, a battery module is provided. The battery module includes a housing, at least two cell groups, and at least two tab groups:

[0006] The at least two cell groups are arranged at intervals in the housing, and each of the cell groups includes positive and negative plates arranged in layers.

[0007] The at least two tab groups are arranged at intervals in the housing, and each of the tab groups is electrically connected to a different cell group.

[0008] The housing further has at least two opening groups, and each of the tab groups extends out of the housing through a different opening group.

[0009] In some embodiments, the battery module further includes:

[0010] A circuit board is arranged outside the housing and located at the position of the at least two opening groups, and is used to establish electrical communication between the battery module and external devices.

[0011] Each of the tab groups is electrically connected to a different connection position of the circuit board through a different opening group.

[0012] In some embodiments, a protection circuit is arranged on the circuit board;

[0013] The protection circuit comprises a first node, a second node, and at least two cell circuits connected in parallel between the first node and the second node;

[0014] The first node and the second node are respectively configured to electrically connect the external device;

[0015] The cell circuit comprises a cell port and a first load element connected in series;

[0016] The cell port of each cell circuit is electrically connected to a different lug group, so as to correspond to a different cell group and electrically communicate with the corresponding cell group.

[0017] In some embodiments, the cell circuit further comprises a first switch;

[0018] The first switch is connected in series with the first load element;

[0019] When the first switch is in an on state, the cell group corresponding to the cell circuit in which the first switch is located is in a working state; the working state comprises a charging state or a discharging state;

[0020] When the first switch is in an off state, the cell group corresponding to the cell circuit in which the first switch is located is in a non-working state.

[0021] In some embodiments, the cell port comprises a cell positive terminal electrically connected to the first node and a cell negative terminal electrically connected to the second node; the first switch and the first load element are both connected to a connection line between the second node and the cell negative terminal;

[0022] The cell circuit further comprises a first detection component;

[0023] The first detection component is electrically connected to the cell positive terminal, the cell negative terminal, the first load element, and the first switch of the cell circuit, respectively, and is configured to control the first switch to switch between the on state and the off state according to a voltage detection result of the first load element and a voltage detection result of the cell port.

[0024] In some embodiments, the protection circuit further comprises a positive signal terminal, a negative signal terminal, a first coulometer, a second load element, and a first detection branch;

[0025] The positive signal terminal is electrically connected to the first node and electrically connected to a positive pin of the external device;

[0026] The negative signal end is electrically connected with the second node and a negative pin of the external device;

[0027] The first detection branch is connected in parallel with the battery cell circuit;

[0028] The second load element is connected in series on a connection line between the second node and the negative signal end;

[0029] The first coulometer is electrically connected with the first detection branch and the second load element respectively, and is configured to determine the state of charge of the battery module according to a current detection result of the second load element and a voltage detection result on the first detection branch.

[0030] In some embodiments, the battery cell circuit further comprises a second switch and a second detection component;

[0031] The second switch is located on a connection line between the first switch and the second node; the second switch has the on state and the off state;

[0032] The second detection component is electrically connected with the battery cell positive end, a ground end, the first load element and the second switch of the battery cell circuit respectively, and is configured to control the second switch to switch between the on state and the off state according to a voltage difference between the battery cell positive end and the ground end and a voltage detection result of the first load element.

[0033] In some embodiments, the first switch and the second switch are both transistors.

[0034] In some embodiments, the battery cell positive end, the battery cell negative end, the first load element and the first switch of the battery cell circuit jointly form a charging and discharging branch;

[0035] The battery cell circuit further comprises a second coulometer and a second detection branch;

[0036] The second detection branch is connected in parallel with the charging and discharging branch;

[0037] The second coulometer is electrically connected with the second detection branch and the first load element respectively, and is configured to determine the state of charge of the battery cell group corresponding to the battery cell circuit according to a voltage detection result of the second detection branch and a current detection result of the first load element.

[0038] In some embodiments, the second detection branch is electrically connected with the battery cell positive end through a third node; the battery cell circuit further comprises a third switch;

[0039] The third switch is connected between the first node and the third node, and has the on state and the off state;

[0040] The second electric quantity meter is electrically connected with the third switch, and is configured to control the third switch to switch between the on state and the off state according to the electric quantity state of the battery cell group corresponding to the battery cell circuit.

[0041] In some embodiments, the third switch is a transistor.

[0042] The source and the drain of the transistor are electrically connected with the first node and the third node respectively.

[0043] The second electric quantity meter is electrically connected with the gate of the transistor, and is configured to adjust the input voltage input to the gate of the transistor according to the electric quantity state of the battery cell group corresponding to the battery cell circuit.

[0044] The internal resistance of the transistor is different when the input voltage is different.

[0045] In some embodiments, the tab group includes one positive tab and one negative tab; the positive plate and the negative plate in the battery cell group each include at least two; the opening group includes a first opening and a second opening.

[0046] For the battery cell group and the opening group corresponding to each tab group, the positive tab in the tab group is electrically connected with the at least two positive plates of the battery cell group respectively, and extends out of the first opening of the opening group to connect the circuit board.

[0047] The negative tab in the tab group is electrically connected with the at least two negative plates of the battery cell group respectively, and extends out of the second opening of the opening group to connect the circuit board.

[0048] According to a second aspect of the embodiments of the present disclosure, an electronic device is provided. The electronic device includes:

[0049] A housing;

[0050] The battery module in the first aspect is arranged on the housing.

[0051] The technical solutions provided by the embodiments of the present disclosure can have the following beneficial effects:

[0052] The battery module proposed in the embodiments of the present disclosure includes at least two cell groups, tab groups and opening groups. Each tab group is electrically connected to a different cell group, and extends out of the shell of the battery module through a different opening group corresponding to the tab group. In this way, the single cell of the battery module is divided into at least two cell groups, and each cell group is led out by different tab groups arranged at intervals. This not only enables independent management of the cell capacity of different cell groups, so that other cell groups can still work normally when a single cell group has a charging and discharging problem, but also enables the positive plates of the same polarity in each cell group to be independent of each other, improving the problem of uneven aging caused by electrical conduction of all positive plates of the same polarity welded to the same tab in the shell, effectively alleviating the aging of the entire battery module and improving the service life of the battery module.

[0053] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0054] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present disclosure and, together with the specification, serve to explain the principles of the present disclosure.

[0055] Figure 1 is a mobile phone battery structure diagram proposed by the related art;

[0056] Figure 2 is a laminated cell expansion structure diagram proposed by the related art;

[0057] Figure 3 is a side cross-sectional view of a laminated cell proposed by the related art;

[0058] Figure 4 is a structural schematic diagram of a battery module according to an exemplary embodiment;

[0059] Figure 5 is a schematic diagram of a circuit board connected to a cell according to an exemplary embodiment;

[0060] Figure 6 is a schematic diagram of a circuit board vertical structure according to an exemplary embodiment;

[0061] Figure 7 is a structural schematic diagram of a protection circuit according to an exemplary embodiment Figure 1 ;

[0062] Figure 8 is a structural schematic diagram of a protection circuit according to an exemplary embodiment Figure 2 ;

[0063] Figure 9 is a structural block diagram of an electronic device according to an exemplary embodiment.

[0064] Figures 4 to 7 Reference signs related to the embodiments of the present disclosure are as follows:

[0065] 1, shell; 11, opening group; 2, battery cell group; 21, positive plate; 22, negative plate; 3, tab group; 31, positive tab; 32, negative tab; 33, base tab; 4, circuit board; 41, protection circuit; 411, first node; 412, second node; 413, third node; 42, battery cell circuit; 421, battery cell port; 422, first load element; 423, first switch; 424, first detection component; 425, second switch; 426, second detection component; 427, second coulometer; 428, third switch; 43, second load element; 44, first coulometer. DETAILED DESCRIPTION

[0066] The exemplary embodiments will be described in detail herein with reference to the accompanying drawings. In the following description, the same numbers refer to the same elements throughout the drawings, unless otherwise represented. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present disclosure. Instead, they only describe examples of devices and methods consistent with some aspects of the present disclosure, as detailed in the appended claims.

[0067] Referring to Figures 1 to 3 , Figure 1 is a structural diagram of a mobile phone battery according to the related art; Figure 2 is an unfolded structural diagram of a laminated battery cell according to the related art; Figure 3 is a side cross-sectional view of a laminated battery cell according to the related art; as shown in Figure 1 , the battery is composed of a battery cell L1 and a protection plate L2, and the tabs (L1+ and L-) of the battery cell L1 are welded with the nickel sheet or nickel brick of the protection plate L2; wherein the protection plate L2 is located at the head of the battery and connected with the tabs extended from the battery cell L1; the protection plate L2 is provided with a protection circuit, and the protection circuit has a power loop, a protection unit, and a coulometer for controlling the charging and discharging of the battery, and some components L3 can be welded on the protection plate L2, and an external connector L4 also establishes an electrical connection with the battery cell L1 through the protection plate L2. As shown in Figure 2 , the battery cell L1 includes a positive plate L11, a separator L12, and a negative plate L13, and the positive plate L11, the separator L12, and the negative plate L13 are formed into a laminated battery cell through processes such as cross-cutting, stacking, welding, packaging, and liquid injection. As shown in Figure 3As shown, the stacked cell is arranged in the battery module shell, and the base pole tabs of the pole plates of the same polarity are welded together first, and then welded with the outer pole tab (illustrated as the positive pole tab L+), and then extended out of the shell through the opening. Since the multiple pole tabs of the same polarity are welded into one positive pole tab and one negative pole tab respectively through the adapter welding to connect with the protection plate, the pole plates of the same polarity and the outer pole tab have different voltage differences due to the difference in welding position, so that the cell has uneven aging during use, and the closer the position to the pole tab, the more serious the aging, thereby causing uneven heating of the battery, resulting in obvious life attenuation problem of the battery module.

[0068] Therefore, the present disclosure provides a battery module. Referring to Figure 4 , Figure 4 is a structural schematic diagram of a battery module according to an exemplary embodiment; wherein the battery module comprises a shell 1, at least two cell groups 2, and at least two pole tab groups 3:

[0069] The at least two cell groups 2 are arranged in the shell 1 in a spaced manner, and each cell group 2 comprises positive pole plates 21 and negative pole plates 22 arranged in a stack;

[0070] The at least two pole tab groups 3 are arranged in the shell 1 in a spaced manner, and each pole tab group 3 is electrically connected with a different cell group 2;

[0071] The shell 1 has at least two opening groups 11, and each pole tab group 3 extends out of the shell 1 through a different opening group 11.

[0072] Here, the battery module according to the present disclosure is electrically connected with external devices; when the external device is a power supply device such as a mobile power supply, a fixed power supply, etc., the battery module can be in a charging state, at which time the charging current of the external power supply enters the cell groups through the pole tab groups in sequence, thereby charging and storing energy for the battery module; when the external device is a power consumption device (or module), the battery module can be in a discharging state, at which time the cell groups in the battery module output discharging current to the power consumption device (or module) through different pole tab groups.

[0073] In the present disclosure, the above-mentioned shell is a shell formed by a metal material and a non-metal material, and an exemplary shell can be an aluminum plastic film.

[0074] The shell head of the battery module is provided with an opening group, and each opening group comprises two openings for different pole tabs in the pole tab group to pass through. It should be noted that each opening group in the present disclosure is arranged in a spaced manner, and the spacing distance is greater than a preset distance threshold, so that the same polarity electrical signals carried on each pole tab group can be reduced, and the mutual interference phenomenon caused by too close distance in the shell can be reduced.

[0075] The sealing agent is arranged at each opening group of the shell in the present disclosure, and is used to seal the position where the tab is penetrated, so as to avoid the dust or water vapor outside from entering the inside of the battery module to cause damage to the battery cell.

[0076] In the embodiments of the present disclosure, the battery module is provided with at least two cell groups and at least two tab groups, wherein the number of the cell groups and the number of the tab groups are the same, and each tab group is electrically connected to a different cell group. In the embodiments of the present disclosure, the number of the opening groups is also the same as the number of the tab groups, and each opening group is aligned with the position of the corresponding tab group.

[0077] Here, the positive plate and the negative plate are arranged in a stack in each cell group, and the polarity between adjacent plates is different; here, the number of positive plates and the number of negative plates are the same, and the positive plate and the negative plate can be one or more; wherein, the isolation film is arranged between adjacent plates, and each cell group also has electrolyte; the electric particles in the cell group can flow between adjacent positive and negative plates through the electrolyte, thereby realizing the charging and discharging function of the battery module. For example, when the battery module is a lithium battery module, the above-mentioned electric particles can be lithium ions.

[0078] For example, when the positive plate and the negative plate are both one, the tab group is only provided with an outer tab, and the outer tab includes a positive tab electrically connected to the positive plate and a negative tab electrically connected to the negative plate; and in the case where the number of positive plates and negative plates in a cell group is multiple, a tab group includes a base tab and an outer tab, and the outer tab includes a positive tab and a negative tab; wherein, the number of base tabs is the same as the number of plates in the cell group corresponding to the tab group. In this way, each tab group is aligned with the position of the corresponding cell group, and each base tab in the tab group is electrically connected to each plate in the corresponding cell group; in addition, the base tab connecting each positive plate is welded with a positive tab and extends out of the first opening in the corresponding opening group, and the base tab connecting each negative plate is welded with a negative tab and extends out of the second opening in the corresponding opening group.

[0079] It should be noted that, Figure 4 is a cross-sectional view of a battery module, which is provided with two cell groups 2 and two tab groups 3, wherein, Figure 4 The positive tab of the first tab group 3 and the negative tab of the second tab group 3 are shown; wherein, the positive tab is connected to the positive plate 21 in the first cell group 2, and the negative tab is connected to the negative plate 22 in the second cell group 2. Each opening group 11 actually has two openings, but Figure 4 only one opening is shown in the opening group 11 in

[0080] In the embodiments of the present disclosure, the number of the cell groups is related to the capacity of the battery module, and is also related to the application scenarios of the battery module; when the battery module has high battery capacity and is applied in high-energy-consumption scenarios, for example, is applied in a mobile phone or a tablet computer which is in use for a long time, more cell groups and tab groups can be set, so that the pole plates in each cell group and the connected tabs can be separated, the problem of uneven battery aging caused by the positive pole plates in each cell group being conducted inside the shell and the negative pole plates being conducted inside the shell is improved, and the service life of the battery module is effectively improved.

[0081] It should be noted that the intervals between the pole plates inside the plurality of cell groups inside the battery module are the same, and the intervals between the adjacent pole plates between adjacent cell groups are the same as the intervals between the adjacent pole plates inside the cell groups; since the embodiments of the present disclosure achieve the isolation of the cells inside the battery module by connecting different tab groups to each pole plate to obtain each cell group, the same intervals are set to further improve the preparation efficiency of the battery module on the basis of effectively realizing the independence of each cell group.

[0082] The battery module provided in the embodiments of the present disclosure includes at least two cell groups, tab groups, and opening groups. Each tab group is electrically connected to a different cell group and extends out of the shell of the battery module through a different opening group corresponding to the tab group. In this way, the single cell of the battery module can be divided into at least two cell groups, and each cell group is led out by different tab groups arranged at intervals. This not only enables independent management of the cell capacity of different cell groups, so that other cell groups can still work normally when a single cell group has a charging and discharging problem, but also enables the pole plates of the same polarity in each cell group to be independent of each other, improves the problem of uneven aging caused by the electrical conduction of all the pole plates of the same polarity being welded to the same tab inside the shell, effectively alleviates the aging of the entire battery module, and improves the service life of the battery module.

[0083] In some embodiments, the battery module further includes:

[0084] A circuit board is arranged outside the shell and located at the position of the at least two opening groups, and is used to establish electrical communication between the battery module and external devices;

[0085] Each tab group is electrically connected to different connection positions of the circuit board through the opening group corresponding to the tab group.

[0086] Referring to Figure 5 , Figure 5 is a schematic diagram of a circuit board connecting cells according to an exemplary embodiment; wherein the circuit board 4 is similar to the protection plate in the conventional scheme, and is arranged at the head of the shell 1 of the battery module and is connected to the opening group Figure 5(Not shown) Corresponding to the setting position. Here, the positive tab 31 and negative tab 32 extending from each tab group are respectively connected to different interface pins on the circuit board.

[0087] Here, the circuit board contains internal circuitry. Some interface pins of this internal circuitry are distributed at the aforementioned different connection locations, used to connect to the respective tab groups extending from each opening group, thereby achieving electrical connection between the internal circuitry and different battery cell groups. Additionally, this internal circuitry also contains other soldering locations or another set of interface pins for connecting external devices. Thus, the internal circuitry enables electrical connection between each battery cell group and external devices, thereby supplying power to the external devices or allowing external devices to charge the battery cell groups in electronic devices.

[0088] It should be noted that the internal circuit is equipped with a fuel gauge, surge protection module, overvoltage and overcurrent protection module or electrostatic discharge protection module, etc., to manage and protect the battery charging or discharging process; the aforementioned fuel gauge can count the power of each cell group and manage the charging and discharging current, rate and / or frequency of each cell group.

[0089] Here, one or more internal circuits can be configured. In some examples of this disclosure, each cell group can be connected to the same internal circuit, which monitors and manages the charging and discharging process of each cell group, achieving unified electrical connection or individual electrical connection between each cell group and external devices. Of course, in other examples of this disclosure, each cell group can also be connected to different internal circuits, with each internal circuit connecting a separate tab group and an external device. In this way, each internal circuit independently manages its corresponding cell group, achieving individual control of the charging and discharging process of different cell groups. Thus, when the battery module is connected to external devices that meet slow charging protocols or when the external devices require less power, a smaller number of cell groups can be used to charge the external devices, thereby reducing the severe heat generation problem caused by multiple cell groups discharging simultaneously and further extending the service life of the battery module.

[0090] In the embodiments of the present disclosure, the setting direction of the circuit board can be parallel to the length direction of the battery module, so as to increase the welding area and wiring space on the circuit board, realize the circuit design of more complex internal circuits, and further realize the development and use of more functions of the battery module. Of course, in other examples, since many battery modules are designed to be light and thin, in order to reduce the space occupation of the battery module, the setting direction of the above-mentioned circuit board can also be perpendicular to the length direction of the battery module; wherein the length of the positive / negative tab of each tab group extending beyond the preset distance and being bent to form a bending area; each bending area is at the same height and collectively forms a support groove, the circuit board is arranged in the support groove, and is perpendicular to the length direction of the battery module, that is, the circuit board is placed vertically; see Figure 6 , Figure 6 is a schematic diagram of a circuit board vertical placement structure according to an example; wherein the tab group 3 is bent to form a support groove, and the circuit board 4 is vertically placed in the support groove.

[0091] The embodiments of the present disclosure can realize the charging and discharging between the battery module and the external device by arranging the circuit board, and each tab group is connected to different connection positions of the circuit board, so as to effectively realize the separate management and control of each battery cell group.

[0092] In some embodiments, see Figure 7 , Figure 7 is a structure schematic diagram of a protection circuit according to an example embodiment Figure 1 ; wherein the circuit board 4 is provided with a protection circuit 41;

[0093] The protection circuit 41 includes a first node 411, a second node 412, and at least two battery cell circuits 42 connected in parallel between the first node 411 and the second node 412;

[0094] The first node 411 and the second node 412 are respectively used for electrically connecting external devices;

[0095] The battery cell circuit 42 includes a battery cell port 421 and a first load element 422 connected in series;

[0096] The battery cell port of each battery cell circuit 42 is electrically connected with different tab groups, for respectively communicating with each different battery cell group through different tab groups.

[0097] Here, the internal circuit provided on the circuit board is one, i.e., a protection circuit, which includes a first node and a second node; the first node is used to connect the positive pin of an external device, and the second node is used to connect the negative pin of the external device; in this way, when the external device is an external power supply, the charging current of the external power supply passes through the positive pin and the first node, enters the cell circuit contained in the protection circuit, and passes through the cell circuit to enter the cell group for energy storage, and the loop current inside the battery module returns to the external device from the cell group, the second node and the negative pin of the external device, forming a complete charging loop. Similarly, when the external device is a power-consuming device / module, the discharge current of the cell group will be input to the power-consuming device / module from the first node and the positive pin, to supply power to the power-consuming device / module, at which time the loop current of the power-consuming device / module will return to the cell circuit from the negative pin and the second node, thereby forming a complete discharge loop.

[0098] The embodiments of the present disclosure provide at least two cell circuits in the internal circuit, and the at least two cell circuits are connected in parallel between the first node and the second node; each cell circuit uniquely corresponds to one cell group, and is used to manage the charging and discharging process of the cell group corresponding thereto, and protect the charging and discharging safety.

[0099] Each internal device provided in each cell circuit can be the same or different, so as to realize separate configuration and management of each cell circuit. For example, in the embodiments of the present disclosure, the internal devices provided in each cell circuit are the same, and each include a cell port and a first load element; the cell ports of different cell circuits correspond to different interface pins proposed above, and different tab groups are connected through the cell ports, so that each cell circuit is electrically connected to one cell group, and the electric quantity in the connected cell group flows through the cell circuit.

[0100] In the embodiments of the present disclosure, the first load element is connected in series with the cell port, and can be provided on the connection line between the cell port and the first node, or on the connection line between the cell port and the second node, which is not limited in the embodiments of the present disclosure; the first load element serves as a load in the cell circuit, and is used to buffer the instantaneous current or voltage when the battery module is connected to the external device, to prevent the circuit board or the battery module from being damaged due to instantaneous short circuit.

[0101] The first load element can be a resistance element, and can also be an inductance element; as shown in Figure 7 The first load element can be a resistance element, such as a precision resistance Rs1.

[0102] In some examples, in combination with Figure 5As shown, the electric core groups 2 can include three, each of the electric core groups 2 including one positive plate 21 and one negative plate 22, the tab groups 3 including three, each of the tab groups 3 including one positive tab 31 and one negative tab 32, and so on, Figure 7 The electric core circuits 42 shown are also three in parallel connection, each of the electric core circuits 42 having one electric core port 421, each of the electric core ports 421 including an electric core positive end and an electric core negative end; as Figure 5 and Figure 7 three electric core positive ends B1+, B2+, B3+ and three electric core negative ends B1-, B2- and B3- in the three electric core circuits 42. Wherein the positive tab 31 of each of the tab groups 3 is connected to the electric core positive end of one electric core port 421, and the negative tab 32 is connected to the electric core negative end of the electric core port 421.

[0103] It should be noted that the internal circuit proposed in the embodiments of the present disclosure also includes some protection devices, such as surge protection diodes, charge discharge elements, etc. These protection devices can be uniformly arranged in the electric core circuit, and the same protection devices are configured for each electric core circuit. Of course, these protection devices can also be arranged outside the electric core circuit, such as being arranged at other positions of the connection line between the first node and the positive pin of the external device, etc. The embodiments of the present disclosure do not limit this.

[0104] In this way, the embodiments of the present disclosure can not only control the storage and release of the electric quantity in each electric core group by arranging the protection circuit in the circuit board and including at least two electric core circuits arranged in parallel in the protection circuit, but also realize that the total electric quantity of the battery module is composed of the total electric quantity of the plurality of electric core groups.

[0105] In some embodiments, as shown in Figure 7 the electric core circuit 42 further includes a first switch 423;

[0106] The first switch 423 is connected in series with the first load element 422;

[0107] Wherein, when the first switch 423 is in an on state, the electric core group corresponding to the electric core circuit 42 where the first switch 423 is located is in a working state; the working state includes a charging state or a discharging state;

[0108] When the first switch 423 is in an off state, the electric core group corresponding to the electric core circuit 42 where the first switch 423 is located is in a non-working state.

[0109] Here, the first switch and the first load element are connected in series, and the first switch element and the first load element can be both arranged in the connection line between the battery cell port and the first node, or both arranged in the connection line between the battery cell port and the second node, or one arranged in the connection line between the battery cell port and the first node and the other arranged in the connection line between the battery cell port and the second node, and the embodiments of the present disclosure do not limit this.

[0110] In the embodiments of the present disclosure, the first switch element includes a conduction state and a disconnection state, and since the first switch element and the first load component are connected in series at the battery cell port, that is, connected in series at the polar plate in the battery cell group, if the first switch is in a disconnection state, the path between the battery cell group and the external device is disconnected, and at this time, whether it is a charging current or a discharging current cannot continue to flow in the battery cell circuit, so the battery cell group is in a non-charging state or a non-discharging state. If the first switch is in a conduction state, the path between the battery cell group and the external device is connected, and at this time, the battery cell group can release a discharging current or accept a charging current input by the external device, and the battery cell group corresponding to the battery cell circuit where the first switch is located is in a charging state or a discharging state.

[0111] Here, the first switch can include a mechanical switch or a signal switch, etc.; for example, the signal switch can be a transistor (MOS tube), which can be a bipolar MOS tube composed of two MOS tubes, or a double-gate MOS tube, and the embodiments of the present disclosure do not limit this.

[0112] For example, referring to Figure 7 , Figure 7 The first switch 423 shown is a bipolar MOS tube formed by connecting the drains of two MOS tubes and connecting a body diode.

[0113] The embodiments of the present disclosure can flexibly control the charging and discharging process of each battery cell group by arranging the first switch, which can reduce the waste of electric quantity and can prevent overcharging, overdischarging and other phenomena, and fully protect the battery circuit.

[0114] It should be noted that in the embodiments of the present disclosure, the first switch can be used as a switch for starting / ending the charging and discharging process. At this time, the first switch can be controlled by the control module of the electronic device in which the battery module is located, or can be controlled by other control chips connected thereto. For example, if it is detected that the interface module of the electronic device is electrically connected with an external device, the first switch can be controlled to be in a conductive state at this time. Conversely, when it is detected that the electrical connection with the external device is disconnected, the first switch can also be controlled to be in a disconnected state. Of course, the above-mentioned first switch can also be used as an overvoltage protection switch or an overcurrent protection switch. At this time, the first switch can be controlled to switch from a conductive state to a disconnected state when overvoltage charging, overvoltage discharging, overcurrent charging and discharging, and the like occur.

[0115] In some embodiments, in combination with Figure 7 The cell port 421 includes a cell positive electrode end electrically connected to the first node 411 and a cell negative electrode end electrically connected to the second node 412; the first switch 423 and the first load element 422 are both connected to the connection line between the second node 412 and the cell negative electrode end.

[0116] The cell circuit 42 further includes a first detection component 424.

[0117] The first detection component 424 is electrically connected to the cell positive electrode end, the cell negative electrode end, the first load element 422 and the first switch 423 of the cell circuit 42, respectively, and is configured to control the first switch 423 to switch between a conductive state and a disconnected state according to the voltage detection result of the first load element 422 and the voltage detection result of the cell port 421.

[0118] Here, for the cell port and the corresponding lug group and cell group, the cell positive electrode end is connected to one or more positive plates in the corresponding cell group through the positive lug in the lug group; and the cell negative electrode end is connected to one or more negative plates in the corresponding cell group through the negative lug in the lug group.

[0119] For example, in combination with Figure 7 As shown in the figure, the first switch 423 and the first load element 422 are both connected to the connection line between the second node 412 and the cell negative electrode end, i.e., located in the charging and discharging loop corresponding to the cell group, and the loop current flowing out of the cell negative electrode passes through.

[0120] In the embodiments of the present disclosure, the first detection component is integrated in the protection chip. When the battery module is a lithium battery module, the protection chip can be a lithium protection IC. The first detection component has multiple pins and nearby resistance and capacitance devices, such as detection pins, control pins, capacitors, resistors, and the like.

[0121] As Figure 7As shown, the first detection component 424 is provided with a capacitor C1 and a resistor R1, the capacitor C1 is connected in parallel across the battery port, one end of the resistor R1 is connected to the positive terminal of the capacitor C1, and the other end is connected to the detection pin VDD, the detection pin VSS is connected to the negative terminal of the capacitor C1; at this time, the design of the capacitor C1 and the resistor R1 plays a filtering role to enable the VDD pin to realize stable voltage detection on the battery port 421; in this way, the voltage difference detected between the VSS pin and the VDD pin can obtain the voltage detection result of the battery port 421, i.e., the corresponding battery group; in addition, another detection pin CS of the first detection component 424 is connected to the connection node between the first load element 422 and the first switch 423 through VINI(1 / 2 / 3), for obtaining the voltage detection result of the first load element 422 according to the voltage difference detected between the CS pin and the VSS pin.

[0122] Here, the voltage detection result of the battery port and the voltage detection result after voltage division of the first load element can be used to determine whether the current battery circuit corresponding to the battery group has the phenomenon of overvoltage charging or overvoltage discharging; here, in the charging process, the charging current will flow through the first switch (the above-mentioned MOS tube), and as the charging proceeds, the voltage of the battery group rises, and when it rises to the maximum charging voltage (generally 4.3V, usually the overcharge protection voltage), the COUT pin in the control pin inputs a control signal (such as a low-level signal) to the MOS tube, so that the MOS tube is in an open state; in the discharging process, if the discharging voltage reaches the maximum discharging voltage (generally 2.4V, usually the over-discharge protection voltage), the DOUT pin of the control pin will input a control signal (such as a low-level signal) to the MOS tube, so that the MOS tube is in an open state. In addition, the voltage detection result of the first load element and the impedance value of the first load element can also be used to obtain the current state on the first load element, so as to determine whether the overcurrent phenomenon of charging and discharging occurs, and if it exists, a control signal (such as a low-level signal) can be input to the MOS tube through the above-mentioned DOUT pin or COUT pin, so that the MOS tube is in an open state.

[0123] In addition, the first detection component 424 further includes a state detection pin V- and a resistor R2, wherein the detection pin V- is connected to the second node 412 through the resistor R2, and the negative pin of the external device is connected through the second node 412; in this way, the detection pin and the resistor R2 can determine whether the external device is in place through the terminal voltage of the resistor R2, and further adjust the charging and discharging process according to whether the external device is in place.

[0124] It should be noted that by detecting the voltage detection results of the cell port and the first load element by the detection pin, the embodiment of the present disclosure can also monitor in real time whether the charging voltage drops below 4.3V or whether the discharging voltage recovers to below 2.4V. If it recovers to the specified voltage range, a high-level signal can be output by the COUT pin and the DOUT pin respectively, to control the MOS tube to recover to the on state, so that the charging and discharging can continue.

[0125] The embodiment of the present disclosure sets the first detection component on each cell circuit and detects the abnormal charging thread existing in the cell circuit by using the first detection component, so as to further control the on state or off state of the first switch, so that the cell circuit proposed in the embodiment of the present disclosure can fully protect the charging and discharging safety of the corresponding cell group.

[0126] In some embodiments, in combination with Figure 7 The protection circuit further comprises a positive signal end (P+), a negative signal end (P-), a first electric quantity meter 44, a second load element 43 and a first detection branch;

[0127] The positive signal end (P+) is electrically connected to the first node 411 and electrically connected to the positive pin of the external device;

[0128] The negative signal end (P-) is electrically connected to the second node 412 and electrically connected to the negative pin of the external device;

[0129] The first detection branch is connected in parallel with the cell circuit 42;

[0130] The second load element 43 is connected in series on the connection line between the second node 412 and the negative signal end (P-);

[0131] The first electric quantity meter 44 is electrically connected to the first detection branch and the second load element 43 respectively, for determining the electric quantity state of the battery module according to the current detection result of the second load element 43 and the voltage detection result on the first detection branch.

[0132] Here, the positive signal end is used as an interface pin of the protection circuit and is directly used for connecting the positive pin of the external device, wherein the positive signal end is connected in series with the first node of the cell circuit in the protection circuit; correspondingly, the negative signal end is used as an interface pin of the protection circuit and is directly used for connecting the negative pin of the external device, wherein the negative signal end is connected in series with the second node of the cell circuit in the protection circuit.

[0133] In the embodiments of the present disclosure, since the first detection branch is connected in parallel with the battery cell circuit, the voltage detection result corresponding to the first detection branch can directly reflect the voltage state in the battery cell circuit. In addition, since the second load element is connected in series between the second node and the negative signal terminal, the current flowing through the second load element is the same as the total current after the parallel connection of each battery cell circuit. In this way, by detecting the voltage detection result on the first detection branch and the current detection result of the second load element, the total battery capacity of the battery cell group corresponding to each battery cell circuit connected in parallel can be calculated.

[0134] Based on this, the embodiments of the present disclosure utilize the electric quantity meter to respectively connect the first detection branch and the second load element, and obtain the current detection result of the second load element and the voltage detection result on the first detection branch.

[0135] The second load element can be a resistance element or an inductance element, and the embodiments of the present disclosure do not limit this. For example, Figure 7 The second load element 43 shown is a resistance element.

[0136] In the embodiments of the present disclosure, the first electric quantity meter 44 includes a detection pin, an enable pin, a signal transmission pin, and surrounding resistance-capacitance devices, etc. Among them, in combination with Figure 7 As shown, the detection pin in the first electric quantity meter 44 includes a BAT_SNS pin and a VSS pin, the BAT_SNS pin is connected to the voltage detection node on the first detection branch, and the VSS is connected to the second node 412; wherein a resistance R3 and a capacitor C2 are arranged on the first detection branch, and the resistance R3 and the capacitor C2 are connected in series; wherein the connection node between the resistance R3 and the capacitor C2 is used as the above-mentioned voltage detection node, and is connected to the above-mentioned BAT_SNS pin. Through the voltage difference between the node voltage of the voltage detection node and the node voltage of the second node obtained by the VSS and the resistance value of the resistance R3, the above-mentioned voltage detection result for at least two battery cell circuits 42 can be obtained. In addition, the detection pin of the first electric quantity meter 44 also includes an SRN pin and an SRP pin, the SRN pin and the SRP pin are connected to both ends of the first load element 422 through a resistance R4 and a resistance R5, respectively, wherein the positive and negative electrodes of the capacitor C3 are connected between the resistance R4 and the SRN pin, and between the resistance R5 and the SRP pin. By setting the resistance R4, the resistance R5 and the capacitor C3, effective circuit filtering can be achieved, which is helpful for effectively detecting the voltage on the second load element 43.

[0137] In addition, the detection pin of the first electric quantity meter 44 further includes a temperature detection pin TS for connecting a temperature detection element NTC to realize detection and judgment of the battery temperature. The enable pins of the first electric quantity meter 44 include BAT and CE, which are respectively used to trigger different functions of the first electric quantity meter, such as electric quantity detection, data calculation, etc. The first electric quantity meter 44 further includes a resistor R6 and a capacitor C4 connected with the BAT pin, wherein the resistor R6 and the capacitor C4 are connected in series to form a series branch, one end of the series branch is grounded, and the other end is connected between the first node 411 and the positive signal end (P+). The BAT pin is connected to the connection node between the resistor R6 and the capacitor C4. When external devices are connected, the potential of the connection node is raised to enable the first electric quantity meter 44 to start the functions such as continuous monitoring of the electric quantity in the charging and discharging process. The CE pin is connected to the node between the upper voltage detection node and the resistor R3, which is also used to enable other functions in the first electric quantity meter 44 by the potential of the node, such as the function of counting the number of charging and discharging cycles. The signal transmission pins of the first electric quantity meter 44 include the SNA / HDQ pin and the SVL pin, which are respectively connected to the communication pins (D and C) of the protection circuit 41. Through the SNA / HDQ pin and the SVL pin, the first electric quantity meter 44 can transmit the collected electric quantity, the number of charging and discharging cycles, the battery temperature data and / or the battery health data, etc. to the outside.

[0138] In the embodiments of the present disclosure, the first electric quantity meter and the second load element can be used to detect the total current after the parallel connection of the at least two cell circuits, so as to realize the capacity calculation of the at least two cell groups by a single electric quantity meter. Compared with the conventional protection circuit design, the embodiments of the present disclosure can realize better distribution of the current on the laminated current collector under the original charging power, so that the deintercalation of the electric ions is more uniform, and the aging speed is further slowed down.

[0139] In some embodiments, in combination with Figure 7 The cell circuit 42 further includes a second switch 425 and a second detection component 426.

[0140] The second switch 425 is located on the connection line between the first switch 423 and the second node 412. The second switch 425 has a conduction state and a disconnection state.

[0141] The second detection component 426 is electrically connected with the cell positive end, the ground end, the first load element 422 and the second switch 425 of the cell circuit 42, respectively, for controlling the second switch 425 to switch between the conduction state and the disconnection state according to the voltage difference between the cell positive end and the ground end and the voltage detection result of the first load element 422.

[0142] Here, the first switch and the second switch have the same function, both of which are to switch the charging and discharging state by being connected in series on the connection line between the second node and the negative electrode end of the battery cell; in this way, the second switch also has the same on state or off state as the second switch.

[0143] Here, the first switch and the second switch can be the same type of switch or different types of switch, and the embodiments of the present disclosure do not limit this; for example, in combination with Figure 7 The second switch 425 is the same as the first switch 423, both of which are bipolar MOS tubes formed by connecting the drains of two MOS tubes and connecting a body diode.

[0144] In some examples of the present disclosure, since the first switch and the second switch are connected in series between the second node and the negative electrode end of the battery cell, when any one of the second switch and the first switch is in the off state, the battery cell groups corresponding to the battery cell circuits in which the two switches are located are both in the non-working state; in other examples of the present disclosure, the first switch and the second switch are in a specified high resistance state when they are in the off state; if one of the detection assemblies corresponding to the two switches has a detection error and accidentally cuts off one of the switches, i.e. the switch is in a high resistance state, and the other switch is in an on state, then at this time the corresponding battery cell circuit can have a small current flowing through, thereby limiting the size of the charging current; but if the overvoltage / overcurrent phenomenon of the battery cell circuit is more obvious, so that the detection assemblies corresponding to the two switches can both determine that the battery cell circuit has an overvoltage / overcurrent phenomenon, then both of the switches are cut off and are in a high resistance state, at this time the corresponding battery cell circuit is in an open circuit state and cannot have a current flowing through, at this time the corresponding battery cell group is in a non-working state.

[0145] Here, the second detection assembly has the same function as the first detection assembly, both of which are used to detect the voltage of the battery cell and the voltage of the first load element; wherein the second detection assembly is also integrated in the protection chip, and when the battery module is a lithium battery module, the protection chip can be a lithium IC. The pins and nearby resistance and capacitance devices in the second detection assembly can be the same as or different from the pins and nearby resistance and capacitance devices in the first detection assembly, for example, including detection pins, control pins, capacitors, and resistors.

[0146] For example, in combination with Figure 7, the second detection component 426 is provided with a resistor R7 and a capacitor C5, wherein a positive electrode end of the capacitor C5 is connected to a positive electrode end of the battery cell circuit 42, and a negative electrode end of the capacitor C5 is grounded; one end of the resistor R7 is connected to the positive electrode end of the capacitor C5, and the other end is connected to a detection pin VDD; a detection pin VSS is connected to the negative electrode end of the capacitor C5, wherein the capacitor C5 and the resistor R7 are designed to play a filtering role, so as to realize stable voltage detection on the battery cell port 421 through a voltage difference between the VDD pin and the VSS pin, thereby obtaining a voltage detection result for the battery cell port 421; in addition, another detection pin CS of the second detection component 426 is connected to a connection node between the first load element 422 and the first switch 423 through VINI(1 / 2 / 3), so as to obtain a voltage detection result of the first load element 422 according to a detection voltage difference between the CS pin and the VSS pin.

[0147] Here, the voltage detection result of the battery cell port and the voltage detection result after voltage division of the first load element 422 can be used by the second detection component 426 to determine whether the current battery cell group corresponding to the battery cell circuit 42 has overvoltage charging or overvoltage discharging phenomenon; wherein the control pin of the second detection component 426 also includes a DOUT pin and a COUT pin; therefore, when the battery cell circuit detects the charging overvoltage phenomenon, the COUT pin in the control pin inputs a control signal (such as a low-level signal) to the MOS tube, so that the MOS tube is in an open state; and if the battery cell circuit 42 detects the discharging overvoltage phenomenon, the DOUT pin in the control pin inputs a control signal (such as a low-level signal) to the MOS tube, so that the MOS tube is in an open state. In addition, if the second detection component 426 obtains the charging and discharging overcurrent phenomenon of the current on the first load element 422 according to the above voltage detection result, a control signal can be input to the MOS tube through the above DOUT pin or COUT pin, so that the MOS tube is in an open state.

[0148] In addition, the second detection component 426 further includes a state detection pin V- and a resistor R8, wherein the detection pin V- is connected to the second node 412 through the resistor R8, and the negative electrode pin of the external device is connected through the second node 412, so that the detection pin and the resistor R8 can judge whether the external device is in place through the end voltage of the resistor R8, and further adjust the charging and discharging process through whether the external device is in place.

[0149] It should be noted that if the voltage detection results of the battery cell port 421 and the first load element 422 of the second detection component 426 indicate that there is no overvoltage / overcurrent phenomenon, and the current external device is in place, a low-level signal can be output by the COUT pin and the DOUT pin respectively, so as to control the second switch to recover from the open state to the conductive state, so that the charging and discharging can continue.

[0150] The second switch and the second detection component are arranged, the two switches connected in series on the line and the two detection components can sufficiently improve the accuracy of the battery cell circuit in judging overvoltage charging, overvoltage discharging and overcurrent charging and discharging of the battery cell group, and effectively protect the charging and discharging process of each battery cell group.

[0151] In some embodiments of the present disclosure, the second switch of the battery cell circuit can also be arranged on the line between the first node and the positive signal end, and a first load element is also arranged in series in the line between the first node and the positive signal end, so that the second detection component can be electrically connected to the battery cell end, the ground end, the first load element and the second switch, respectively, to realize the end and start of the charging and discharging process.

[0152] In some embodiments, the first switch and the second switch are both transistors.

[0153] For example, the first switch and the second switch are both bipolar MOS transistors as described above; wherein the first switch and the second switch can both be composed of PMOS transistors, or both be formed by NMOS transistors, or be formed by different types of MOS transistors, respectively, and the embodiments of the present disclosure do not limit this.

[0154] Here, the COUT pin and the DOUT pin of the first detection component are connected to the gate terminals of the two MOS transistors in the first switch (bipolar MOS transistor), wherein when the COUT pin and the DOUT pin of the first detection component input low-level signals, the first switch is in an off state, and when the COUT pin and the DOUT pin of the first detection component input high-level signals, the first switch is in an on state. Similarly, the COUT pin and the DOUT pin of the second detection component are connected to the gate terminals of the two MOS transistors, so that when the COUT pin and the DOUT pin of the second detection component input low-level signals, the second switch is in an off state, and when the COUT pin and the DOUT pin of the second detection component input high-level signals, the second switch is in an on state.

[0155] The embodiments of the present disclosure improve the flexibility and effectiveness of the charging and discharging process control by arranging the first switch and the second switch as transistors that can be flexibly controlled.

[0156] In some embodiments, referring to Figure 8 , Figure 8 is a structure diagram of a protection circuit according to an exemplary embodiment Figure 2 ; the battery cell positive end, the battery cell negative end, the first load element 422 and the first switch 423 of the battery cell circuit 42 together form a charging and discharging branch;

[0157] The battery cell circuit 42 further comprises a second detection branch and a second coulometer 427;

[0158] The second detection branch is connected in parallel with the charging and discharging branch.

[0159] The second coulometer 427 is electrically connected with the second detection branch and the first load element 422 respectively, and is configured to determine the state of charge of the battery cell group corresponding to the battery cell circuit 42 according to the voltage detection result of the second detection branch and the current detection result of the first load element 422.

[0160] It should be noted that, Figure 8 In the protection circuit shown, the first node 411 can serve as the positive signal terminal (P+), or no other electronic device is arranged between the first node 411 and the positive signal terminal (P+); similarly, the second node 412 can serve as the negative signal terminal (P-), or no other electronic device is arranged between the second node 412 and the negative signal terminal (P-). At least two battery cell circuits 42 are directly connected in parallel between the first node 411 and the second node 412, and the battery cell port 421, the first load element 422, the first switch 423 and the first detection assembly 424 arranged in each battery cell circuit 42 are connected with Figure 7 The corresponding circuit structures arranged are the same; and in the embodiment, at least two second coulometers 427 are arranged in the protection circuit, wherein one second coulometer 427 is arranged in each battery cell circuit 42, and the second coulometer 427 is configured to detect the state of charge of the battery cell group corresponding to the battery cell circuit 42.

[0161] Here, the battery cell positive terminal, the battery cell negative terminal, the first load element 422 and the first switch 423 of the battery cell circuit 42 together form the charging and discharging branch; and the second detection branch is connected in parallel with the charging and discharging branch, and can directly reflect the total voltage state of the corresponding charging and discharging branch. In this way, by detecting the voltage detection result on the second detection branch and the current detection result of the first load element 422, each second coulometer 427 can perform data calculation to obtain the battery capacity of the battery cell group corresponding to the battery cell circuit 42 where the second coulometer 427 is located.

[0162] In the embodiment of the present disclosure, the second coulometer 427 comprises a detection pin, an enable pin, a signal transmission pin and surrounding resistance-capacitance devices, etc. Among them, in combination with Figure 8 As shown, the detection pin in the second coulometer 427 comprises a VDD pin and a VSS pin; the VDD pin is connected with the voltage detection node on the second detection branch, wherein a resistor R9 and a capacitor C6 are arranged on the second detection branch, and the resistor R9 and the capacitor C6 are connected in series; the connection node between the resistor R9 and the capacitor C6 serves as the voltage detection node and is connected with the VDD pin. By the voltage difference between the node voltage of the voltage detection node and the reference voltage of the ground and the resistance value of the resistor R9, the voltage detection result of the corresponding charging and discharging branch can be obtained.

[0163] In addition, the detection pin of the second coulomb counter 427 further includes an SRN pin and an SRP pin, the SRN pin is connected to the first load element 422 through a resistor R10, and specifically connected to a connection node between the first load element 422 and the first switch 423; the SRP pin is grounded through a resistor R11; wherein the positive and negative electrodes of a capacitor C7 are connected between the resistor R10 and the SRN pin and between the resistor R11 and the SRP pin, respectively. By setting the resistor R10, the resistor R11 and the capacitor C7, effective circuit filtering can be achieved, which helps to effectively detect the voltage across the first load element 422; wherein by combining the detection result of the voltage across the first load element 422 with the impedance value of the first load element 422, the current detection result of the first load element 422 can be obtained, which can be used to calculate the electric quantity.

[0164] In addition, the detection pin of the second coulomb counter 427 further includes a temperature detection pin TS for connecting a temperature detection element NTC to realize detection and judgment of the battery temperature. The enable pin of the second coulomb counter 427 includes a BAT pin; the BAT pin is connected to a connection node between the resistor R9 and the capacitor C6, and when an external device is connected, the potential of the connection node is raised to enable the coulomb counter to start the functions of continuous monitoring of the electric quantity, counting of the number of charge and discharge cycles, detecting the battery health data and the like. The signal transmission pin of the second coulomb counter 427 includes an SNA / HDQ pin and an SVL pin, which are respectively connected to the communication pins (D and C) of the protection circuit, and through the SNA / HDQ pin and the SVL pin, the second coulomb counter 427 can further transmit the collected current electric quantity, the number of charge and discharge cycles, the battery temperature data and / or the battery health data and the like to the outside.

[0165] In the embodiments of the present disclosure, by setting the second coulomb counter in each cell circuit, each coulomb counter can evaluate the performance of the cell group corresponding to the cell circuit, so that the battery module can selectively adjust the working state of each cell group according to the state of each cell group, and improve the flexibility of the battery module in charge and discharge processing.

[0166] In some embodiments, in combination Figure 8 , the second detection branch is electrically connected to the positive electrode end of the cell through the third node 413; the cell circuit 42 further includes a third switch 428;

[0167] The third switch 428 is connected to the connection line between the first node 411 and the third node 413, and has a conduction state and a disconnected state;

[0168] The second electric quantity meter 427 is electrically connected with the third switch 428, and is configured to control the third switch 428 to switch between the on state and the off state according to the state of charge of the battery cell group corresponding to the battery cell circuit 42.

[0169] Here, the third switch and the first switch have the same function, and both have the on state and the off state; when the third switch is in the on state, the battery cell group corresponding to the battery cell circuit where the third switch is located is in the working state (charging state or discharging state); when the third switch is in the off state, the battery cell corresponding to the battery cell circuit where the third switch is located is in the non-working state (i.e., the battery cell cannot be charged and discharged).

[0170] It should be noted that, compared with the second switch provided in the above embodiment, the second switch is closer to the negative signal end and is used for control in the signal output section of the battery module, while the third switch is closer to the positive signal end and is used for control in the signal input section of the battery module. By controlling the signal input section, the charging and discharging process can be more accurately and quickly cut off when overvoltage / overcurrent abnormality occurs in the circuit, and more damage to the battery cell and the subsequent circuit caused by the input signal entering the subsequent circuit can be reduced.

[0171] Here, the second electric quantity meter also integrates the function of the second detection component, and is configured to determine whether the battery cell circuit where the second electric quantity meter is located has overvoltage or overcurrent phenomenon according to the voltage detection result of the second detection branch and the current detection result of the first load element; in addition, the second electric quantity meter is also provided with a PACK pin which has the same function as the V-pin of the second detection component, wherein the PACK pin is connected to the first node through the resistor R12, and is used for detecting whether the external device is in place, so as to control the switch state of the third switch electrically connected to the second electric quantity meter in combination with the detection result of the overvoltage / overcurrent phenomenon.

[0172] Here, the third switch and the first switch can be the same type of switch or different types of switch, and the embodiments of the present disclosure do not limit this.

[0173] In some embodiments, the third switch is a transistor.

[0174] The source and the drain of the transistor are electrically connected with the first node and the third node, respectively.

[0175] The second electric quantity meter is electrically connected with the gate of the transistor, and is configured to adjust the input voltage input to the gate of the transistor according to the state of charge of the battery cell group corresponding to the battery cell circuit.

[0176] Here, the internal resistance of the transistor is different when the input voltage is different.

[0177] For example, in combination with the above-mentioned embodiment, the third switch is a transistor. Figure 8The third switch 428 is the same as the first switch 423, and is a bipolar MOS tube formed by connecting the drains of two MOS tubes and connecting a body diode. The two transistors in the bipolar MOS tube are both NMOS tubes. In addition, the second electric quantity meter further includes control pins DSG and CHG; the DSG pin is connected to one of the NMOS tubes, and the CHG pin is connected to the other NMOS tube. Here, when the second electric quantity meter 427 determines that the battery cell circuit 42 where it is located has a charging overvoltage phenomenon based on detection, the DSG pin in the control pin inputs a low-level signal to the gate of the connected NMOS tube, so that the NMOS tube is in an off state; and when the second electric quantity meter 427 determines that the battery cell group corresponding to the battery cell circuit 42 where it is located has a discharging overvoltage phenomenon based on detection, the CHG pin in the control pin inputs a low-level signal to the gate of the connected NMOS tube, so that the NMOS tube is in an off state. In addition, when the second electric quantity meter 427 determines that the battery cell circuit 42 where it is located has a charging and discharging overcurrent phenomenon, a low-level signal can be input to the connected NMOS tube through the above-mentioned DSG pin, so that the NMOS tube is in an off state.

[0178] It should be noted that the second electric quantity meter 427 in the embodiment of the present disclosure further has a resistor R13, one end of the resistor R13 is connected to a connection node between the DSG pin and the corresponding MOS tube, and the other end is connected to the second node 412; at this time, the DSG pin can be a detection pin, and the current passing through the resistor R13 is further calculated by detecting the voltage of the resistor R13, and then the current detection result of the resistor R13 and the current detection result of the first load element 422 are used to jointly determine whether the battery cell circuit has a charging and discharging overcurrent phenomenon.

[0179] In the embodiment of the present disclosure, since the second electric quantity meter can also collect and calculate the performance parameters (current electric quantity, charging and discharging cycle number, battery cell health, battery temperature data and battery health data, etc.) of the corresponding battery cell group, and each battery cell circuit is provided with one second electric quantity meter, the embodiment of the present disclosure can control the charging and discharging rate or charging and discharging process of each battery cell group (cell).

[0180] In some examples, since the internal resistance of the MOS tube changes with the gate voltage input to the gate; therefore, in the absence of an overvoltage / overcurrent phenomenon, the embodiment of the present disclosure can adjust the internal resistance of the third switch (bipolar MOS tube) through the control pin of the second electric quantity meter according to the situation of the battery cell group corresponding to the battery cell circuit where the second electric quantity meter is located; for example, if cell1 (such as Figure 8If the second electric quantity meter 427 in the corresponding electric cell circuit 42 corresponding to the first electric cell port 421 in the cell group in the battery module detects that the battery health of cell1 is too low, the CHG pin input of the second electric quantity meter 427 is adjusted to input a high-level signal to the input voltage of the NMOS tube, so as to increase the internal resistance of the NMOS, and then limit the discharge rate of cell1.

[0181] In some examples, if the battery module is applied in an electronic device and used as a power supply module to provide power, the performance parameters of the cell groups collected by the respective electric quantity meters can be acquired by a control module of the electronic device, and the internal resistance state of the third switch in the corresponding electric cell circuit of each cell group can be flexibly controlled, so as to flexibly control the charging rate or the discharge rate of each cell group, and then overall relieve the aging of each cell group.

[0182] In the embodiments of the present disclosure, the second electric quantity meter integrates the detection function of the protection IC on the charging and discharging process, and also has the function of controlling the switch state of the third switch. In this way, not only the setting position of the protection IC is reduced, and the device space occupation of the protection board is reduced, but also the internal resistance of the third switch can be adjusted according to various battery parameters of the cell group collected by each electric quantity meter, so as to flexibly adjust the charging rate of different cell groups, and realize scientific and reasonable charging and discharging in the case of protecting the battery life to a greater extent.

[0183] In some embodiments, the tab group includes one positive tab and one negative tab; the positive plate and the negative plate in the cell group each include at least two; the opening group includes a first opening and a second opening;

[0184] Among them, for the cell group and the opening group corresponding to each tab group, the positive tab in the tab group is respectively electrically connected to the at least two positive plates of the cell group, and extends out of the first opening of the opening group to connect the circuit board;

[0185] The negative tab in the tab group is respectively electrically connected to the at least two negative plates of the cell group, and extends out of the second opening of the opening group to connect the circuit board.

[0186] Here, Figure 5One of the shown cell groups 2 includes one positive plate 21 and one negative plate 22; but in actual implementation, as the battery module requires larger battery capacity, multiple plates are stacked in the battery module; and as the battery shell opening and sealing also have certain difficulties, the disclosed embodiments can set appropriate opening group numbers and set one cell group to include multiple positive plates and negative plates in consideration of sealing, preparation and other factors. Each positive plate is connected to one base pole tab, and each tab group includes multiple base pole tabs, but only one positive tab and one negative tab, and the multiple base pole tabs are uniformly welded to one positive tab or negative tab through the polarity of the connecting plate, and the positive tab is connected to the cell positive end of one cell port of the above-mentioned circuit board through the first opening. Similarly, the negative tab of the same tab group is connected to the cell negative end of the corresponding cell port through the second opening of the corresponding opening group.

[0187] In some embodiments of the present disclosure, the number of positive plates in each cell group is the same as the number of negative plates in each cell group. In this way, the maximum capacity of each cell group in the embodiments of the present disclosure is the same, which can realize the comparison between the state of charge of each cell group, making the charge management of each cell group more flexible and effective.

[0188] In some embodiments of the present disclosure, the number of positive plates in each cell group is the same as the number of negative plates in each cell group. In this way, the maximum capacity of each cell group in the embodiments of the present disclosure is the same, which can realize the comparison between the state of charge of each cell group, making the charge management of each cell group more flexible and effective.

[0189] The embodiments of the present disclosure can more reasonably realize the independent management of multiple cells of the battery module by setting each cell group to include at least two positive plates and negative plates and reasonably controlling the number of opening groups and tab groups.

[0190] The embodiments of the present disclosure also provide an electronic device. The electronic device includes:

[0191] A housing;

[0192] The battery module in the above-mentioned embodiments of the present disclosure is arranged on the housing.

[0193] Here, the housing is used to support various functional modules inside the electronic device, such as processing modules, battery modules, etc.

[0194] In some examples, the electronic device can be used as a power supply device; at this time, the housing is provided with a transmission interface or a plug, which can be electrically connected with an external power-consuming device to supply power to the external power-consuming device; and can also be electrically connected with an external power source to obtain the power of the external power source to realize power storage.

[0195] Wherein, the power supply device includes a fixed power supply or a mobile power supply, of course, the power supply device can also be a terminal device capable of reverse charging, such as a mobile phone, a tablet computer, a personal computer device, etc.

[0196] In some examples, the electronic device is also used as a power consumption device. At this time, the power consumption device includes a power consumption module, such as a camera module, a display screen, an audio module, etc.; the battery module is in electrical communication with the power consumption module, and is used to provide power for the function of the power consumption module. The battery module in the embodiment of the present disclosure has a plurality of independent cell groups, and the plurality of cell groups can be individually connected to external devices through different tabs, realizing the independent management of each cell area, which helps to delay the aging effect of the battery module and improve the service life of the electronic device.

[0197] Hereinafter, the battery module proposed in the embodiment of the present disclosure is described by taking a lithium ion battery as the battery module and a mobile phone as the electronic device.

[0198] The embodiment of the present disclosure realizes that each group of tabs is respectively connected to different laminated core current collectors by changing the cell group of the battery from one group to three or more groups, and changing the tab from one group to multiple groups, and that the same polarity current collectors in different groups are independent of each other inside the cell, and each group of tabs is respectively connected to different connection positions of the circuit board in the battery module.

[0199] Wherein, Figure 5 The structure of the battery module proposed in the embodiment of the present disclosure is shown; wherein, the cell group 2 can include three, each cell group 2 includes a positive plate 21 and a negative plate 22, and the tab group 3 includes three, each tab group 3 includes a positive tab 31 and a negative tab 32; each cell circuit on the circuit board 4 has a cell port 421, each cell port 421 includes a cell positive terminal and a cell negative terminal; as shown in Figure 5 three cell positive terminals B1+, B2+, and B3+ and three cell negative terminals B1-, B2-, and B3- in the cell group 2. Wherein, the positive tab 31 of each tab group 3 is connected to the cell positive terminal of a cell port 421, and the negative tab 32 is connected to the cell negative terminal of the cell port 421. In this way, the battery module of the present disclosure contains three independent sub-cells.

[0200] In some examples, in order to realize independent protection of the three sub-cells and the total capacity of the three sub-cells, the design Figure 7The shown multi-tab connection protection circuit with partitionable protection has three groups of protection circuits, each of which independently protects one group of battery cells through a corresponding battery cell circuit 42. Each battery cell circuit 42 includes two detection components (a first detection component 424 and a second detection component 426) and two bipolar MOS tubes (corresponding to a first switch 423 and a second switch 425), thereby achieving independent protection of the charging and discharging of three sub-battery cells.

[0201] Since the three battery cell circuits 42 are connected in parallel, a second load element 43 (Rs total) is added to the detection loop of the first coulometer 44 to detect the total current on the three battery cell circuits 42, thereby achieving capacity calculation of three sub-battery cells by a single coulometer. Compared with the conventional design, this scheme can also achieve better distribution of the current on the laminated current collector under the original charging power, ensure more uniform lithium ion extraction, and effectively slow down the aging speed.

[0202] In other examples, in order to achieve independent management of three sub-battery cells and the sum of the capacities of three sub-battery cells, a design is made Figure 8 The shown multi-tab connection protection circuit with partitionable management has three groups of protection circuits, each of which independently protects one group of battery cells through a corresponding battery cell circuit 42. Each battery cell circuit 42 includes a separately arranged first detection component 424 and two bipolar MOS tubes (corresponding to a first switch 423 and a third switch 428), and the detection function is also integrated in a second coulometer 427. Thus, each battery cell circuit 42 has a second coulometer 427, thereby achieving independent management of three sub-battery cells.

[0203] The three second electric quantity meters corresponding to the three sub-cells have the following functions: (1) the three second electric quantity meters independently calculate the charge and discharge capacity, cycle number and battery health of each sub-cell; (2) the second electric quantity meter can independently control the charge and discharge of the loop of each sub-cell according to the health of each sub-cell, for example, when it is detected that the health of cell1 is low, the electric quantity meter can disconnect the charging path of cell1 when it is not full and disconnect the discharge loop when it is not discharged, so as to realize the delay of aging speed through shallow charging and shallow discharging; (3) the positive system of the mobile phone can actively control the discharge rate of the sub-cell by analyzing the health of the three sub-cells, so as to realize the balance of aging, for example, when it is detected that the health of cell1 is low, the system notifies the corresponding electric quantity meter to limit the discharge rate, the electric quantity meter can increase the resistance of the MOS by adjusting the gate voltage of the corresponding MOS, and then the discharge rate of cell1 can be reduced under the same current, so as to realize the aging delay of cell1. The whole machine can also be notified to reduce the total charging current, and the charging rate of cell1 is reduced under the condition that the charging rates of cell2 and cell3 are unchanged, so as to realize the aging delay of cell1.

[0204] Figure 9 is a structural block diagram of an electronic device according to an exemplary embodiment. For example, the electronic device 900 can be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, etc.

[0205] Referring to Figure 9 , the electronic device 900 can include one or more of the following components: a processing component 902, a memory 904, a power supply component 906, a multimedia component 908, an audio component 910, an input / output (I / O) interface 912, a sensor component 914, and a communication component 916.

[0206] The processing component 902 usually controls overall operations of the electronic device 900, such as operations associated with display, telephone call, data communication, camera operation and recording operation, at least one of them. The processing component 902 can include one or more processors 920 to execute instructions to complete all or part of the steps of the above-mentioned methods. In addition, the processing component 902 can include one or more modules to facilitate interaction between the processing component 902 and other components. For example, the processing component 902 can include a multimedia module to facilitate interaction between the multimedia component 908 and the processing component 902.

[0207] The memory 904 is configured to store various types of data to support operations on the electronic device 900. Examples of such data include at least one of instructions for any application or method operating on the electronic device 900, contact data, phonebook data, messages, pictures, and videos. The memory 904 can be implemented by any type of volatile or nonvolatile memory, or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, a magnetic disc, or an optical disc.

[0208] The power component 906 supplies power for various components of the electronic device 900. The power component 906 can include at least one of a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the electronic device 900. Among them, the one or more power supplies can be the battery module proposed in the embodiments of the present disclosure.

[0209] The multimedia component 908 includes a screen providing an output interface between the electronic device 900 and a user. In some embodiments, the screen can include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes the touch panel, the screen can be implemented as a touch screen to receive an input signal from a user. The touch panel includes one or more touch sensors to sense a touch, a slide, and a gesture on the touch panel. The touch sensor can not only sense a boundary of a touching or a sliding action, but also detect duration and pressure related to the touching or sliding action. In some embodiments, the multimedia component 908 includes a front camera and / or a rear camera. When the electronic device 900 is in an operation mode, such as a photographing mode or a video mode, the front camera and / or the rear camera can receive external multimedia data. Each of the front camera and the rear camera can be a fixed optical lens system or have a focal length and an optical zooming capability.

[0210] The audio component 910 is configured to output and / or input audio signals. For example, the audio component 910 includes a microphone (MIC) that is configured to receive an external audio signal when the electronic device 900 is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signal can be further stored in the memory 904 or transmitted via the communication component 916. In some embodiments, the audio component 910 also includes a speaker for outputting audio signals.

[0211] The input / output interface 912 provides an interface between the processing component 902 and peripheral interface modules, which can include a keypad, a click wheel, buttons, and so on. The buttons can include, but are not limited to, a home button, a volume button, a start button, and a lock button.

[0212] The sensor component 914 includes one or more sensors for providing various state assessments for the electronic device 900. For example, the sensor component 914 can detect an open / closed position of the electronic device 900, relative positioning of components, such as a display and a keypad of the electronic device 900, a change in position of the electronic device 900 or a component of the electronic device 900, a presence or absence of user contact with the electronic device 900, the orientation or acceleration / deceleration of the electronic device 900, and a temperature change of the electronic device 900. The sensor component 914 can include a proximity sensor configured to detect presence of a nearby object without any physical touch. The sensor component 914 can further include a light sensor, such as a complementary metal oxide semiconductor (CMOS) or charge coupled device (CCD) image sensor, for use in an imaging application. In some embodiments, the sensor component 914 can further include at least one of an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, and a temperature sensor, among others.

[0213] The communication component 916 is configured to facilitate wired or wireless communication between the electronic device 900 and other devices. The electronic device 900 can access a wireless network based on a communication standard, such as Wi-Fi, 4G, 5G, or a combination thereof. In an example embodiment, the communication component 916 receives a broadcast signal or broadcast related information from an external broadcast management system via a broadcast channel. In an example embodiment, the communication component 916 also includes a Near Field Communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on Radio Frequency Identification (RFID) technology, Infrared Data Association (IrDA) technology, Ultra Wide Band (UWB) technology, Bluetooth (BT) technology, and other technology.

[0214] In example embodiments, the electronic device 900 can be implemented using one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, micro-controllers, microprocessors, or other electronic elements.

[0215] Other embodiments of the present disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the aspects of the present disclosure disclosed herein. It is intended that the present disclosure cover any and all variations of the present disclosure that come within the scope of the claims and a concept of equivalents thereof. The specification and examples given are exemplary only and it is intended that the true scope and spirit of the present disclosure be limited only by the claims.

[0216] It should be understood that the present disclosure is not limited to the precise structures herein described and illustrated in the drawings and that various modifications and changes can be made therein without departing from the scope thereof. The scope of the present disclosure is limited only by the claims.

Claims

1. A battery module, characterized in that, Includes a casing, at least two battery cell assemblies, and at least two electrode assemblies: At least two of the battery cell groups are spaced apart within the housing, and each of the battery cell groups includes a positive electrode plate and a negative electrode plate stacked together. At least two electrode groups are spaced apart inside the housing, and each electrode group is electrically connected to a different battery cell group. The outer casing also has at least two opening groups, and each of the tab groups extends out of the outer casing through a different opening group.

2. The battery module according to claim 1, characterized in that, The battery module also includes: A circuit board is disposed outside the housing and located at the positions of at least two of the opening groups, for establishing an electrical connection between the battery module and external devices; Each of the electrode groups is electrically connected to different connection positions on the circuit board through different opening groups.

3. The battery module according to claim 2, characterized in that, The circuit board is equipped with a protection circuit. The protection circuit includes a first node, a second node, and at least two cell circuits connected in parallel between the first node and the second node; The first node and the second node are respectively used for electrical connection to the external device; The battery cell circuit includes a battery cell port and a first load element connected in series; Each of the battery cell circuits has a battery cell port that is electrically connected to a different electrode group, and is used to electrically connect to each of the different battery cell groups through the different electrode groups.

4. The battery module according to claim 3, characterized in that, The battery cell circuit also includes a first switch; The first switch is connected in series with the first load element; When the first switch is in the ON state, the battery cell group corresponding to the battery cell circuit where the first switch is located is in the working state; the working state includes charging state or discharging state. When the first switch is in the open state, the cell group corresponding to the cell circuit where the first switch is located is in a non-working state.

5. The battery module according to claim 4, characterized in that, The cell port includes a positive terminal electrically connected to the first node and a negative terminal electrically connected to the second node; the first switch and the first load element are both connected to the connection line between the second node and the negative terminal of the cell. The battery cell circuit also includes a first detection component; The first detection component is electrically connected to the positive terminal of the battery cell, the negative terminal of the battery cell, the first load element, and the first switch of the battery cell circuit, respectively, and is used to control the first switch to switch between the on state and the off state based on the voltage detection results of the first load element and the voltage detection results of the battery cell port.

6. The battery module according to claim 5, characterized in that, The protection circuit further includes: a positive signal terminal, a negative signal terminal, a first fuel meter, a second load element, and a first detection branch; The positive signal terminal is electrically connected to the first node and also electrically connected to the positive pin of the external device. The negative signal terminal is electrically connected to the second node and also electrically connected to the negative pin of the external device. The first detection branch is connected in parallel with the battery cell circuit; The second load element is connected in series on the connection line between the second node and the negative signal terminal; The first fuel gauge is electrically connected to the first detection branch and the second load element, respectively, and is used to determine the power status of the battery module based on the current detection result of the second load element and the voltage detection result of the first detection branch.

7. The battery module according to claim 6, characterized in that, The battery cell circuit also includes a second switch and a second detection component; The second switch is located on the connection line between the first switch and the second node; the second switch has the on state and the off state; The second detection component is electrically connected to the positive terminal of the battery cell, the ground terminal, the first load element, and the second switch of the battery cell circuit, respectively, and is used to control the second switch to switch between the on state and the off state based on the voltage difference between the positive terminal of the battery cell and the ground terminal and the voltage detection result of the first load element.

8. The battery module according to claim 7, characterized in that, Both the first switch and the second switch are transistors.

9. The battery module according to claim 5, characterized in that, The positive terminal of the battery cell, the negative terminal of the battery cell, the first load element, and the first switch together form a charging and discharging branch in the battery cell circuit. The battery cell circuit also includes a second fuel gauge and a second detection branch; The second detection branch is connected in parallel with the charge / discharge branch; The second power meter is electrically connected to the second detection branch and the first load element, respectively, and is used to determine the power status of the battery pack corresponding to the battery cell circuit based on the voltage detection result of the second detection branch and the current detection result of the first load element.

10. The battery module according to claim 9, characterized in that, The second detection branch is electrically connected to the positive terminal of the battery cell through a third node; the battery cell circuit also includes a third switch; The third switch is connected to the connection line between the first node and the third node, and has the on state and the off state; The second fuel gauge is electrically connected to the third switch and is used to control the third switch to switch between the on state and the off state according to the power status of the battery pack corresponding to the battery cell circuit.

11. The battery module according to claim 10, characterized in that, The third switch is a transistor; The source and drain of the transistor are electrically connected to the first node and the third node, respectively; The second fuel gauge is electrically connected to the gate of the transistor and is used to adjust the input voltage to the gate of the transistor according to the power status of the battery pack corresponding to the battery cell circuit. The internal resistance of the transistor varies with different input voltages.

12. The battery module according to any one of claims 2 to 11, characterized in that, The electrode assembly includes a positive electrode and a negative electrode; the positive electrode plate and the negative electrode plate in the cell assembly each include at least two; the opening assembly includes a first opening and a second opening; Specifically, for each of the tab groups and the opening groups, the positive tabs in the tab groups are electrically connected to at least two positive plates of the cell group and extend from the first opening of the opening group to connect to the circuit board. The negative tabs in the tab group are electrically connected to at least two negative plates of the cell group, and extend from the second opening of the opening group to connect to the circuit board.

13. An electronic device, characterized in that, include: case; The battery module as described in any one of claims 1 to 12 is disposed on the housing.

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